CA2055684C - Variable thrust caulk dispensing device - Google Patents
Variable thrust caulk dispensing device Download PDFInfo
- Publication number
- CA2055684C CA2055684C CA002055684A CA2055684A CA2055684C CA 2055684 C CA2055684 C CA 2055684C CA 002055684 A CA002055684 A CA 002055684A CA 2055684 A CA2055684 A CA 2055684A CA 2055684 C CA2055684 C CA 2055684C
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- Canada
- Prior art keywords
- trigger
- plunger
- grip
- bearing
- housing
- Prior art date
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- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
- B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
- B05C17/00553—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with means allowing the stock of material to consist of at least two different components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
- B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
- B05C17/01—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20582—Levers
- Y10T74/20612—Hand
- Y10T74/20624—Adjustable
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating Apparatus (AREA)
Abstract
An improved single and double cylinder hand-operated caulking gun having a direct plunger drive mechanism including a bearing assembly for increasing trigger leverage to allow delivery of a dense composition at a high volume and flow rate.
The caulking gun of the present invention includes an adjustable trigger stop for minimizing hand fatigue during prolonged use, quick-release pistons, and a dual-cartridge restraining screw.
The caulking gun of the present invention includes an adjustable trigger stop for minimizing hand fatigue during prolonged use, quick-release pistons, and a dual-cartridge restraining screw.
Description
2055b84 VAFv I ABLE THif;tJST CAULh~ D I SF'ENS T NG DEV I CE
F T ELD OF TF-IE I NVENT I ON
The present invention re:Lates to dispensing devices, and more particularly to a hand-held caulk: dispensing g~.~n.
DESCF I F'T I OhJ OI= THE BACf~.'.(5Fi0UND
Caul~:ing guns are used to dispense a wide variety of fluid compositions such as t_crethane, vinyl, polyester, epo:<y and other plastics. These compositions are often very dense, yet the ca~tl ~~i ng gun rm_cst be capabl a a~f appl yi ng the campasi ti an aver a wi de range a~f vol urnetri c ~f 1 aw rates. In order to achi eve hi gher f 1 ow rates, pri ar art cac_V I~:i ng guns are necessari I y smal 1 i n sire. Otherwise, the farce required to operate the caull~::ing gun would exceed the capala~ilities o-f the operator. Canseq~_rentiy, compla>: gear-drives and pneumatic caulk:i.ng guns were developed to overcame the prab 1 em. However , these i mpraved cac_vl E:: i ng guns share a common characteristic. They are very expensive to manufacture and pradur:e. There is a clear demand for an inexpensive hand-held caulking gun capable of delivering a dense composition at a high delivery volume and flow rate. U. S. Patent No. 4,c~81,liy issued t:o Chang addresses the demand. The Chang caulking gun posi'tion~~ the trigger pivot and trigger drive grip engagement above the plunger shaft. This improvement increase the leverage abtainabl.e by a hand operated trigger and allows del i very of the cornpoG~i ti an at a h i gher val ume and f 1 ow rate than was previously possibly in a hand-held caulking gun. Moveover, the improvement can be accomplished at no additional coat.
hJevei~thel esr~, then~e i a an even- i ncreasi ng demand ~f or a hand-operated cm.~l.~::i.ng gun l7aving mare power and improved feature.
SUIhM~'~hY (~I= l'HF_ I IVVENT T OfV
I t i s theref ore an abj ect o~f the present i nventi an to provi de an i mproved caa.rl k:i ng c.~un capabl a o~f del i veri ng a dense composition at a high volume and flow rate.
It is another object of the invention to provide the above-described caulking gun at a minimum manufacturing expense.
It is still another object of the present invention to incorporate the above-described advantages in a twin cylinder caulk dispenser for use in delivering complementary compositions such as epoxy resin and hardener.
It is yet another object of the present invention to provide a caulk dispenser which is convenient to use, and which minimize hand fatigue resulting from prolonged use.
According to the present invention, the above described and other objects are accomplished by providing a frame, a plunger including a plunger shaft for forwardly urging a caulking composition, a plunger driving means including a housing having a downwardly extending handle, a first grip enclosed within the housing, said first grip encircling the plunger shaft and protruding upwardly beyond the plunger ~- 2 -;fii'' , shaft to a location proximate an upper portion of the housing, a trigger pivoted to the housing and extending upwardly within the housing to a trigger pivot located above the plunger shaft, a bearing mounted on a portion of said trigger above the pivot, said bearing operatively engaging the upward protrusion of the first grip, and the first grip being driven by the bearing for advancing the plunger, a first compression spring oppositely biasing the first grip against the operative engagement with the bearing, and plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing plunger pressure whereby the plunger can be manually retracted.
Accordingly in one aspect, the present invention resides in a caulking gun comprising a frame, a plunger including a plunger shaft for forwardly urging a caulking composition, plunger driving means, said plunger driving means further comprising a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to the plunger shaft and protruding upwardly beyond the plunger shaft, a trigger pivot located above said plunger shaft, a trigger extending upwardly within the housing and pivoting about said trigger pivot, a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit providing a direct slidable engagement along a face of said first grip, ~- 3 -z~5~68~
and said bearing bit operating to cam the first grip as said trigger is pivoted to grip and advance the plunger, adjustable mounting means for adjustably retaining said bearing bit on said trigger, said mounting means allowing said bearing bit to be positioned and secured along said portion of said trigger above said trigger pivot, a first compression spring oppositely biasing said first grip against the operative engagement with said bearing bit, and plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and having a portion operable for releasing plunger pressure to allow manual retraction of said plunger.
In another aspect, the present invention resides in a twin-cylinder caulking gun, camprising: a frame, a dual plunger including para:Llel first and second plunger shafts for forwardly urging caulking material from a cartridge, said first and second plunger shafts being joined at one end, plunger driving mEaans for' driving said dual plunger by operating directly on ;said first plunger shaft, said plunger driving means further comprising a housing having a downwardly extending handle, a first grip enclosed within said housing, said fir:;t grip being linked to said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper zo~56s~.
portion of the trigger extending upwardly within the housing past said trigger pivot and directly and frictionally engaging said first grip, said first grip being driven by said upper trigger portion for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the operative engagement with the upper trigger portion, and dual plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said plunger, an adjustable trigger stop for limiting a pivoting arc of said trigger, said adjustable trigger stop further comprising an elongate strut housed within said handle for engaging said trigger when pivoted, a stem passing through said handle and through one end of said strut, a selecting knob mounted on said stem externally of said handle for selecting an incremental pivoting arc of said trigger by alignment of said strut, whereby a side of said handle is formed with a plurality of bore-holes spaced equidistant from said stem, and another end of said strut is provided with a protruding pir~ positionable by operation of said selecting knob within ona of said bore-holes to allow incremental selection of a pivoting arc of said trigger.
In a further aspect, the present invention resides in a caulking gun, comprising:
a frame;
a"S,r a plunger including a plunger shaft for forwardly urging a caulking composition;
plunger driving means, said plunger driving means further comprising, a housing having a downwardly extending handl e, a first grip enclosed within said horsing, said first grip being ',linked to the plunger shaft and protruding upwardly beyond the pl~.mger shaft;
a trigger pivot located above said plunger shaft;
a trigger externding upwardly within the housing and pivoting about said trigger pivot;
a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit directly fr'iCtiOnally engaging said first grip, and said first grip being driven by said bearing bit for advancing the plunged a first compression spring oppositely biasing said f i rst gri p agai nst the fr'iCtionel engagement wi th said beari ng;
bit; and plunger pressure reltaining means including : second grip and second spring, the second grip being biased by the second spring and havi ng a port i on ope~rabl a f or rel easi n9 p1 unqer pressur~t to allow manual retraction of said plunger.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of the present invention become apparent from the following detailed description of 2~Q55684 preferred embodiments and certain mod ifications thereof when taken together with accompanying drawings, in which:
FIG. 1 is a per spective view of a caulking gun according to one embodiment of the present invention.
FIG. y is a breaE;-away view of the internal assembly ov a caulk: dispenser having an adjustable bearing assembly in accordance with the embodiment shown in Fig. 1.
FIG. :~, i s a perspecti ve vi ew of the ad jttstabl a beari ng assembl y of FIG. 2.
FIG. 4 is an assembly diagram of the adjustable bearing assembly of FIG. ?.
FIG. ~ i s a break:-away ui ew o~F cool ki ng gun o~f FIG. 1 showing a trigger stoip mechanism according to the present invention.
FIG. b is a bottom view of the trigger shop mechanism o~F
FIG. 5.
FIG. 7 is a perspective view o~f a dual cylinder caulk:
dispenser according to another embodiment of the present i n vent i on .
FIG. B is a break-away ~riew of the caulking gun of FIG. 7 I
showing the improved drive mechanism according to the present i invention. I -FIG. 9 is a detailed diagram of the piston assembly of FIG.
7.
_ 7 _ DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 is a perspective view of a manually operated caulking gun according to the present invention. The caulking gun includes a plunger 50 :having a plunger shaft 55 and a piston 57 which is driven by an .improved plunger drive assembly. The drive assembly includes a housing 80, and a trigger 10 pivoted at a screw hinge 40 located above plunger shaft 55. As described in U.S. Patent No. 4,081,112 issued to Chang, screw hinge 40 is located above piston rod 50 to increase the trigger leverage.
The drive assembly further includes a bearing assembly :~~~ located on a portion 20 of trigger 10 which e;;tends above screw hinge 4~C~. In addition, a trigger stop mechani sm 6~~ i s provi ded on downwardl y e:<tendi ng handl a 9c~ to adjust the arc of trigger 1~:~ for reducing hand Fatigue.
FIG. 2 shows a breal.:-away view of the improved drive assembly of FIG. 1. Plunger shaft JJ e>;tends through, and is carried by housing t3«. Trigger 1« e:.tends upwardly into housing flan, straddles plunger shaft 5~, and is pivotally fis;ed to housing B~~ at a screw hinge 40 located above plunger shaft 55.
A portion 20 of trigger 10 extends past screw hinge 40. Bearing assembly 30 includes a bearing 10c~ adjustably secured by set screw !10 to the upwardly extending portion 20 of trigger 10. A
first gripping member 120 is carried by plunger shaft 55 and is b i ased away f rom the 1 ef t wal 1 of housi ng 8~7 and i nto beari ng 1u0 by compression spring 134. The resilient bias is imparted to _ 8 _ tri gger 1~~~ through bear-i ng 1.~»~. An apposi to resi 1 i ent bi as i s imparted an trigger 1~:~ by compression spring 1:'S. A second grip 14~=a es: tends downwardl y f ram the tap of housi ng F3c7 and straddl. es plunger shaft JJ. trip 14c~ pivots at the top o~f housing f3~~ and is outwardly biased by compression spring i.5«.
In operation, trigger i~? is depressed and pivots about screw hinge 40:x. Eiearing icyC~, which is carried an the upper portion of trigger inn, is foi~ced against grip 1~t~ as trigger icy is depressed. As grip 1~~:~ is pressed forward, it engages plunger shaft 5J and causes pli.cnger shaft 5J to be driven forward through housing 8cn. As trigger ic:~ is released, it is biased back to its original position by c~nmpression spring 1~5. Lik:ewise, grip i~c~
returns to its original position as a result of spring lTca.
However, grip 14c.~ engages plunger shaft 55 to prevent the shaft from back-sliding. The above-described operation is repeated to drive the plunge shaft J5 incrementally forward until the caulk cylinder is depleted and/or the operator desires to stop. At this point the portion o~f grip l4ca e::tending downwardly below plunger shaft 55 can bea depressed, thereby releasing all pressure on plunger- shaft 55. An operator may grasp knob ibu for convenient extraction of plunger 50 From a caulk cylinder'<not shown). The caulk cylinder can then be easily removed and discarded.
FIG. 3 and FIG. 4 give a more detailed illustration o~f bearing. 1V4 and its mounting. Hearing 10c7 is a Iow friction insert which may be~formed of brass, oil impregnated sintered ._ g _ .y ~05568~.
metal, a polymer, or any other known Iow-friction material.
Beari ng itocn s1 i des across the f acts of gri p 1ci as tri gger itu i s pivoted. The composition and shape of bearing ltnc_i are carefully chosen to minimise frit:_tion despite the perpendicular ~caulk:ing force e>;erted between drip i~tn and bearing 1t_:0.
E~earing lt.:t_: :is mounted on an upper portion Wit) o-F trigger icu wh i ch a>; tends above screw hi nge 4ty. E1 ongated s1 ow l7to i s formed i through tri gger it=~, ancf set screw 1 itn i s threaded through s1 of l7tj into the rear of bewaring itnC:. The head of set screw 11t.".:
straddl es the e1 angatecl s1 of 17c~, Thi s way, when set screw 1 itn i i s ti ghtened, beari ng i.taca i s secured agai nst tri gger icy. The '' position of bearing it:7t:~ can be adjusted upwardly or downwardly along the upper portion of trigger ic_r depending an the seating of set screw iito within elongated slot l7cn. This adjustment allows ~I
the 1 ever age of tri gger itn agai nst gri p 12c'.~ to be i ncreased or I
decreased at-_rardingly. If bearing itnc~ is seated low on the upper portion ~t:~ of trigger itn, then the leverage is ma:.imized and a ', greater force can be e:aerted on plunger shaft 55. Conversely, iv I
beari ng 10th i s seated h~ i gh upon tri gger 10, then the 1 average i s I
mi n i mi z ed and p l unge shaf t 55 can be moved i n l arger i ncrements.~
Additionally, an index may be proved adjacent to slot 170 for . ,ICI
facilitating the positioning o°F bearing 10c7. 'Set screw 130 can _ i be aligned with the indlex to achieve a predetermined leverage.
When an operator dlesires to cease dispensing the composition, he may depress grip l4ta. This frees the plunger shaf t 55, thereby rel ea,si ng the compressi ve force.
The invention rnay be provided with a bore hole ~5, as shown in FIGS. 1 and ~, through one side of handle 9«. The canventi anal r_ar-tri dge ti p provi ded on a cac_cl k: cyl i nder may be inserted through bore hold ~5, and the tip may be severed by pi voti ng tri gger Ici agai nst handl a 9«. Thus, the ca~cl l:: di spenser of the present invention provides an additional convenience by severing the -tip of a new ca~_clk: cylinder.
FIGS. 5 and b detail a trigger stop mechanism bc=y which may be used to limit the arc of trigger icy when depressed. It has been fund that shortening the arc of trigger ii_~ helps to alleviate hand fatigue. Trigger stop b~:~ comprises a knob l9ca mounted on a stem ~«c>> which passes through and is carried by handl a 9cy . The rotati on of knob l9co cac.cses rotati on of stem ~c_icu.
A strut 2~cf i s mounted on stem ~rW i nsi de handl a 9~~. Rotati on of knob 19c7 causes strut ~~O to pivot around stem 2c7cu. A pin ?4<:a extends from the opposite end of strut ~~0 toward one side of handl a 9c:~. F'i n ~4t~ f i is wi thi n one of a number of hol es ~T«
which are equidistant frorn stem ~c~c~. A compression spring Rico I
biases strut y~c:~ such that pin y4ca will remain seated in one of 'i the holes 2~c:~. t::nob 19c~ can be pulled away from handle 9ca and I
rotated in order to e::tract and position pin 24c'.~ in another of the.holes ~3t7. In this manner, an operator can align strut 2~G
in different angles with respect to trigger 9c5. The arc in which I
trigger 9c~ is free to swing is determined by the alignment of I
strut 22c~. By 1 i mi ti ng the arc of tri gger 9th, an operator can '' I
i reduce hand fatigue when dispensing a large amount of caulk: over I
time.
FICa. 7 shows another embodiment of the invention in which the above-~descr i. bed f eatures are i ncorporated ~ i n a dual cyl i rider cac_cl k:i rig g~cn. The dual cyl i rider cac_cl k:i rig gun operates wi th two paral 1 e1 y spaced p 1 anger shat t s ~bc:~ and ~7c:~ wh i ch are .i of ned at one end. A housing ~W:=~ carries bath plunger shafts ~bC~ and ~7c_f, which both e:~;tend thrac_cgh and are carried by hamsing ~8c=a. Frame 29c~ is delifined to accommodate a twin cartridge for dispensing compositions which rm_cst be mi:,ed immediately prior to appl icatian. The resin and hardener which mi.: to form epo;,y cement are typical e,.amples o~F smr_h compositions.
FIG. ~3 shows a break:-away view of the improved drive assembly of FIG. 1 adapted for use in a dml cylinder caulking gun. Trigger Jc_~c_r e:.ctends upwardly into housing ~~3~r, straddles the 1 ower p1 ~cnger shat t ~7c:~, and i s pi votal 1 y f i :;ed to ho~csi rig ~8n at a screw hinge ~icn located above lower plunger shaft ~7t>>.
A portion .3c:W of trigger :~c~5c_a e:,tends past screw hinge :'iii toward upper p 1 anger shat t ~bC~. A f i. rst fir i pp i rig member :~~c:> i s carr i. ed by c.rpper plc_cnger shaft ~bri and is biased away from the left wall of housi rig ~~3t:> by compressi on spri. rig .'~~. The resi 1 i. ent bi as i s i mparted to tri gger .~~c'~. An i denti cal beari rig assembl y =c_r as shown in FIGS. 1-4 may also be incorporated in the dual cylinder Gaulk:ing gun. Compression spring 34c:~ imparts an opposing resilient bias to trigger Tcoc~~. A second grip 3~i~ e:, tends downwardl y f rorn i nsi de housi. rig 28c~, straddl es 1 ower p1 ~cnger shaft 27~, and protrudes upwardly outside housing 28U.
In operation, trigger ~~n:r is depressed and pivots about screw hinge ."ir:r. The r_tpper pcrrti.on .'"~:W o~F trigger .Tc'_~iy including bear i ng assemb 1 y :'r:r, dr~:i ves gr i p :'?o as tr i gger .. cai r i s depressed .
As grip .'~r:r is driven forward it engages upper plunger shaft ~bi~
and drives bath shaft<a ~7~:~ and ~b~i forward through hor_rsing ~~3r:r.
As trigger .Tr:y~:r is rele~asPd, it is biased hack:: to its original.
position by compre<.ssion spring :'4t~. Lik:ewise, grip .~y~r returns to its original position as a result of spring .~"~c:r. However, gr i p Wc7 wi l l engage p l anger shat t 27r~ to prevent the shat is 26r~.
and ?7ro frorn back:-wl i. di. ng. TI-re above-descri. bed operati an i s repeated to drive bath p1r_rnger shafts ~7r:r and ~~b~i incrementally forward until tlhe caulk: cylinder is depleted and/or, the operator desires to stop. At this point grip .'S~ can be depressed to release all pressure an plunger shaft ~7c~. An operator may grasp the junction of plunger shafts ?br:r and ~7~~ far convenient a>: tracti on From a twi n coal 4~ cyl i nder (not shown ) . The Gaul k:
cylinder can then be easily removed and discarded.
try operating directly an upper plunger shaft ~Wi, the drive mechani sm of the present i nvent i an operates more easi 1 y than prior art dual cylinder caulking guns, yet the manufacturing costs are lower.
In addition, a twin caulk: cartridge may be secured in place by tightening screw 4~n~a which is threaded into the left wall of housing '~8r~. The head of screw 4c~r~ buts the caulk: cylinder and, when e.rtended, secures the cylinder against frame '~9~1.
~- 13 -2056$4 Snap-on piston assemblies 4~~~ are also provided at the ends of p l anger shat is 2b~n and ~70.
FIG. 9 illustrates a snap-on piston assembly 45~n in mare I
detail. Piston assembly 45« includes a piston 455', and a hollow I
cylindrical base Obey an which piston 455 is mounted. The mid- ~I
section of base 4bn i=. defined by a reduced diameter channel. A
smal l bare hol a 4b5 e;<:tends from the outer peri phery o-F the il channel through a wal 1 of base 4bC~ to the hot 1 ow thereof . The diameter of bore hole 465 is tapered to provide a seating for a small ball bearing 51~:~. E~all bearing 51t~ sits within bore hole ~I~
465 such that the ser_t.ion of the periphery of ball bearing 51~s e;; tends s1 i ght I y i nto the hol 1 ow of base 4~bc_~. A compressi an r i ng 5ycy f i is aver bal 1 bear i ng 51 c'~ and si is f 1 ash wi th i n the recessed I
channel of base 46~:~. Compression ring 5~~:~ biases ball bearing 51 ~5 towards the hol 1 ow of base 4b~:~. An annul ar groove 5.~:co i s cut i i into the end of each plunger shaft. When the plunge shaft is I
f u1 1 y i nserted wi thi n base 4b~~, bal 1 beari ng 51~o e;;tends i nto groove 5~i_~ such that f i ston 455 i s rel easi bI y 1 ocl.:ed on the end ' I
of the plunger shaft. A sharp pull on piston,455 will overcome the compressive force of band 52U and piston 455 can be removed from the shaft. Many shapes and sues of pistons 455 may be easily interchanged with this assembly in order to accommodate I
the various twin caulk cartridges now available.
I
Various modifications and alterations of this invention will II
be apparent to those skilled ion the art without departing from ii the spirit and scope crF the invention.
_ 14 _
F T ELD OF TF-IE I NVENT I ON
The present invention re:Lates to dispensing devices, and more particularly to a hand-held caulk: dispensing g~.~n.
DESCF I F'T I OhJ OI= THE BACf~.'.(5Fi0UND
Caul~:ing guns are used to dispense a wide variety of fluid compositions such as t_crethane, vinyl, polyester, epo:<y and other plastics. These compositions are often very dense, yet the ca~tl ~~i ng gun rm_cst be capabl a a~f appl yi ng the campasi ti an aver a wi de range a~f vol urnetri c ~f 1 aw rates. In order to achi eve hi gher f 1 ow rates, pri ar art cac_V I~:i ng guns are necessari I y smal 1 i n sire. Otherwise, the farce required to operate the caull~::ing gun would exceed the capala~ilities o-f the operator. Canseq~_rentiy, compla>: gear-drives and pneumatic caulk:i.ng guns were developed to overcame the prab 1 em. However , these i mpraved cac_vl E:: i ng guns share a common characteristic. They are very expensive to manufacture and pradur:e. There is a clear demand for an inexpensive hand-held caulking gun capable of delivering a dense composition at a high delivery volume and flow rate. U. S. Patent No. 4,c~81,liy issued t:o Chang addresses the demand. The Chang caulking gun posi'tion~~ the trigger pivot and trigger drive grip engagement above the plunger shaft. This improvement increase the leverage abtainabl.e by a hand operated trigger and allows del i very of the cornpoG~i ti an at a h i gher val ume and f 1 ow rate than was previously possibly in a hand-held caulking gun. Moveover, the improvement can be accomplished at no additional coat.
hJevei~thel esr~, then~e i a an even- i ncreasi ng demand ~f or a hand-operated cm.~l.~::i.ng gun l7aving mare power and improved feature.
SUIhM~'~hY (~I= l'HF_ I IVVENT T OfV
I t i s theref ore an abj ect o~f the present i nventi an to provi de an i mproved caa.rl k:i ng c.~un capabl a o~f del i veri ng a dense composition at a high volume and flow rate.
It is another object of the invention to provide the above-described caulking gun at a minimum manufacturing expense.
It is still another object of the present invention to incorporate the above-described advantages in a twin cylinder caulk dispenser for use in delivering complementary compositions such as epoxy resin and hardener.
It is yet another object of the present invention to provide a caulk dispenser which is convenient to use, and which minimize hand fatigue resulting from prolonged use.
According to the present invention, the above described and other objects are accomplished by providing a frame, a plunger including a plunger shaft for forwardly urging a caulking composition, a plunger driving means including a housing having a downwardly extending handle, a first grip enclosed within the housing, said first grip encircling the plunger shaft and protruding upwardly beyond the plunger ~- 2 -;fii'' , shaft to a location proximate an upper portion of the housing, a trigger pivoted to the housing and extending upwardly within the housing to a trigger pivot located above the plunger shaft, a bearing mounted on a portion of said trigger above the pivot, said bearing operatively engaging the upward protrusion of the first grip, and the first grip being driven by the bearing for advancing the plunger, a first compression spring oppositely biasing the first grip against the operative engagement with the bearing, and plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing plunger pressure whereby the plunger can be manually retracted.
Accordingly in one aspect, the present invention resides in a caulking gun comprising a frame, a plunger including a plunger shaft for forwardly urging a caulking composition, plunger driving means, said plunger driving means further comprising a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to the plunger shaft and protruding upwardly beyond the plunger shaft, a trigger pivot located above said plunger shaft, a trigger extending upwardly within the housing and pivoting about said trigger pivot, a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit providing a direct slidable engagement along a face of said first grip, ~- 3 -z~5~68~
and said bearing bit operating to cam the first grip as said trigger is pivoted to grip and advance the plunger, adjustable mounting means for adjustably retaining said bearing bit on said trigger, said mounting means allowing said bearing bit to be positioned and secured along said portion of said trigger above said trigger pivot, a first compression spring oppositely biasing said first grip against the operative engagement with said bearing bit, and plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and having a portion operable for releasing plunger pressure to allow manual retraction of said plunger.
In another aspect, the present invention resides in a twin-cylinder caulking gun, camprising: a frame, a dual plunger including para:Llel first and second plunger shafts for forwardly urging caulking material from a cartridge, said first and second plunger shafts being joined at one end, plunger driving mEaans for' driving said dual plunger by operating directly on ;said first plunger shaft, said plunger driving means further comprising a housing having a downwardly extending handle, a first grip enclosed within said housing, said fir:;t grip being linked to said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper zo~56s~.
portion of the trigger extending upwardly within the housing past said trigger pivot and directly and frictionally engaging said first grip, said first grip being driven by said upper trigger portion for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the operative engagement with the upper trigger portion, and dual plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said plunger, an adjustable trigger stop for limiting a pivoting arc of said trigger, said adjustable trigger stop further comprising an elongate strut housed within said handle for engaging said trigger when pivoted, a stem passing through said handle and through one end of said strut, a selecting knob mounted on said stem externally of said handle for selecting an incremental pivoting arc of said trigger by alignment of said strut, whereby a side of said handle is formed with a plurality of bore-holes spaced equidistant from said stem, and another end of said strut is provided with a protruding pir~ positionable by operation of said selecting knob within ona of said bore-holes to allow incremental selection of a pivoting arc of said trigger.
In a further aspect, the present invention resides in a caulking gun, comprising:
a frame;
a"S,r a plunger including a plunger shaft for forwardly urging a caulking composition;
plunger driving means, said plunger driving means further comprising, a housing having a downwardly extending handl e, a first grip enclosed within said horsing, said first grip being ',linked to the plunger shaft and protruding upwardly beyond the pl~.mger shaft;
a trigger pivot located above said plunger shaft;
a trigger externding upwardly within the housing and pivoting about said trigger pivot;
a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit directly fr'iCtiOnally engaging said first grip, and said first grip being driven by said bearing bit for advancing the plunged a first compression spring oppositely biasing said f i rst gri p agai nst the fr'iCtionel engagement wi th said beari ng;
bit; and plunger pressure reltaining means including : second grip and second spring, the second grip being biased by the second spring and havi ng a port i on ope~rabl a f or rel easi n9 p1 unqer pressur~t to allow manual retraction of said plunger.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of the present invention become apparent from the following detailed description of 2~Q55684 preferred embodiments and certain mod ifications thereof when taken together with accompanying drawings, in which:
FIG. 1 is a per spective view of a caulking gun according to one embodiment of the present invention.
FIG. y is a breaE;-away view of the internal assembly ov a caulk: dispenser having an adjustable bearing assembly in accordance with the embodiment shown in Fig. 1.
FIG. :~, i s a perspecti ve vi ew of the ad jttstabl a beari ng assembl y of FIG. 2.
FIG. 4 is an assembly diagram of the adjustable bearing assembly of FIG. ?.
FIG. ~ i s a break:-away ui ew o~F cool ki ng gun o~f FIG. 1 showing a trigger stoip mechanism according to the present invention.
FIG. b is a bottom view of the trigger shop mechanism o~F
FIG. 5.
FIG. 7 is a perspective view o~f a dual cylinder caulk:
dispenser according to another embodiment of the present i n vent i on .
FIG. B is a break-away ~riew of the caulking gun of FIG. 7 I
showing the improved drive mechanism according to the present i invention. I -FIG. 9 is a detailed diagram of the piston assembly of FIG.
7.
_ 7 _ DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 is a perspective view of a manually operated caulking gun according to the present invention. The caulking gun includes a plunger 50 :having a plunger shaft 55 and a piston 57 which is driven by an .improved plunger drive assembly. The drive assembly includes a housing 80, and a trigger 10 pivoted at a screw hinge 40 located above plunger shaft 55. As described in U.S. Patent No. 4,081,112 issued to Chang, screw hinge 40 is located above piston rod 50 to increase the trigger leverage.
The drive assembly further includes a bearing assembly :~~~ located on a portion 20 of trigger 10 which e;;tends above screw hinge 4~C~. In addition, a trigger stop mechani sm 6~~ i s provi ded on downwardl y e:<tendi ng handl a 9c~ to adjust the arc of trigger 1~:~ for reducing hand Fatigue.
FIG. 2 shows a breal.:-away view of the improved drive assembly of FIG. 1. Plunger shaft JJ e>;tends through, and is carried by housing t3«. Trigger 1« e:.tends upwardly into housing flan, straddles plunger shaft 5~, and is pivotally fis;ed to housing B~~ at a screw hinge 40 located above plunger shaft 55.
A portion 20 of trigger 10 extends past screw hinge 40. Bearing assembly 30 includes a bearing 10c~ adjustably secured by set screw !10 to the upwardly extending portion 20 of trigger 10. A
first gripping member 120 is carried by plunger shaft 55 and is b i ased away f rom the 1 ef t wal 1 of housi ng 8~7 and i nto beari ng 1u0 by compression spring 134. The resilient bias is imparted to _ 8 _ tri gger 1~~~ through bear-i ng 1.~»~. An apposi to resi 1 i ent bi as i s imparted an trigger 1~:~ by compression spring 1:'S. A second grip 14~=a es: tends downwardl y f ram the tap of housi ng F3c7 and straddl. es plunger shaft JJ. trip 14c~ pivots at the top o~f housing f3~~ and is outwardly biased by compression spring i.5«.
In operation, trigger i~? is depressed and pivots about screw hinge 40:x. Eiearing icyC~, which is carried an the upper portion of trigger inn, is foi~ced against grip 1~t~ as trigger icy is depressed. As grip 1~~:~ is pressed forward, it engages plunger shaft 5J and causes pli.cnger shaft 5J to be driven forward through housing 8cn. As trigger ic:~ is released, it is biased back to its original position by c~nmpression spring 1~5. Lik:ewise, grip i~c~
returns to its original position as a result of spring lTca.
However, grip 14c.~ engages plunger shaft 55 to prevent the shaft from back-sliding. The above-described operation is repeated to drive the plunge shaft J5 incrementally forward until the caulk cylinder is depleted and/or the operator desires to stop. At this point the portion o~f grip l4ca e::tending downwardly below plunger shaft 55 can bea depressed, thereby releasing all pressure on plunger- shaft 55. An operator may grasp knob ibu for convenient extraction of plunger 50 From a caulk cylinder'<not shown). The caulk cylinder can then be easily removed and discarded.
FIG. 3 and FIG. 4 give a more detailed illustration o~f bearing. 1V4 and its mounting. Hearing 10c7 is a Iow friction insert which may be~formed of brass, oil impregnated sintered ._ g _ .y ~05568~.
metal, a polymer, or any other known Iow-friction material.
Beari ng itocn s1 i des across the f acts of gri p 1ci as tri gger itu i s pivoted. The composition and shape of bearing ltnc_i are carefully chosen to minimise frit:_tion despite the perpendicular ~caulk:ing force e>;erted between drip i~tn and bearing 1t_:0.
E~earing lt.:t_: :is mounted on an upper portion Wit) o-F trigger icu wh i ch a>; tends above screw hi nge 4ty. E1 ongated s1 ow l7to i s formed i through tri gger it=~, ancf set screw 1 itn i s threaded through s1 of l7tj into the rear of bewaring itnC:. The head of set screw 11t.".:
straddl es the e1 angatecl s1 of 17c~, Thi s way, when set screw 1 itn i i s ti ghtened, beari ng i.taca i s secured agai nst tri gger icy. The '' position of bearing it:7t:~ can be adjusted upwardly or downwardly along the upper portion of trigger ic_r depending an the seating of set screw iito within elongated slot l7cn. This adjustment allows ~I
the 1 ever age of tri gger itn agai nst gri p 12c'.~ to be i ncreased or I
decreased at-_rardingly. If bearing itnc~ is seated low on the upper portion ~t:~ of trigger itn, then the leverage is ma:.imized and a ', greater force can be e:aerted on plunger shaft 55. Conversely, iv I
beari ng 10th i s seated h~ i gh upon tri gger 10, then the 1 average i s I
mi n i mi z ed and p l unge shaf t 55 can be moved i n l arger i ncrements.~
Additionally, an index may be proved adjacent to slot 170 for . ,ICI
facilitating the positioning o°F bearing 10c7. 'Set screw 130 can _ i be aligned with the indlex to achieve a predetermined leverage.
When an operator dlesires to cease dispensing the composition, he may depress grip l4ta. This frees the plunger shaf t 55, thereby rel ea,si ng the compressi ve force.
The invention rnay be provided with a bore hole ~5, as shown in FIGS. 1 and ~, through one side of handle 9«. The canventi anal r_ar-tri dge ti p provi ded on a cac_cl k: cyl i nder may be inserted through bore hold ~5, and the tip may be severed by pi voti ng tri gger Ici agai nst handl a 9«. Thus, the ca~cl l:: di spenser of the present invention provides an additional convenience by severing the -tip of a new ca~_clk: cylinder.
FIGS. 5 and b detail a trigger stop mechanism bc=y which may be used to limit the arc of trigger icy when depressed. It has been fund that shortening the arc of trigger ii_~ helps to alleviate hand fatigue. Trigger stop b~:~ comprises a knob l9ca mounted on a stem ~«c>> which passes through and is carried by handl a 9cy . The rotati on of knob l9co cac.cses rotati on of stem ~c_icu.
A strut 2~cf i s mounted on stem ~rW i nsi de handl a 9~~. Rotati on of knob 19c7 causes strut ~~O to pivot around stem 2c7cu. A pin ?4<:a extends from the opposite end of strut ~~0 toward one side of handl a 9c:~. F'i n ~4t~ f i is wi thi n one of a number of hol es ~T«
which are equidistant frorn stem ~c~c~. A compression spring Rico I
biases strut y~c:~ such that pin y4ca will remain seated in one of 'i the holes 2~c:~. t::nob 19c~ can be pulled away from handle 9ca and I
rotated in order to e::tract and position pin 24c'.~ in another of the.holes ~3t7. In this manner, an operator can align strut 2~G
in different angles with respect to trigger 9c5. The arc in which I
trigger 9c~ is free to swing is determined by the alignment of I
strut 22c~. By 1 i mi ti ng the arc of tri gger 9th, an operator can '' I
i reduce hand fatigue when dispensing a large amount of caulk: over I
time.
FICa. 7 shows another embodiment of the invention in which the above-~descr i. bed f eatures are i ncorporated ~ i n a dual cyl i rider cac_cl k:i rig g~cn. The dual cyl i rider cac_cl k:i rig gun operates wi th two paral 1 e1 y spaced p 1 anger shat t s ~bc:~ and ~7c:~ wh i ch are .i of ned at one end. A housing ~W:=~ carries bath plunger shafts ~bC~ and ~7c_f, which both e:~;tend thrac_cgh and are carried by hamsing ~8c=a. Frame 29c~ is delifined to accommodate a twin cartridge for dispensing compositions which rm_cst be mi:,ed immediately prior to appl icatian. The resin and hardener which mi.: to form epo;,y cement are typical e,.amples o~F smr_h compositions.
FIG. ~3 shows a break:-away view of the improved drive assembly of FIG. 1 adapted for use in a dml cylinder caulking gun. Trigger Jc_~c_r e:.ctends upwardly into housing ~~3~r, straddles the 1 ower p1 ~cnger shat t ~7c:~, and i s pi votal 1 y f i :;ed to ho~csi rig ~8n at a screw hinge ~icn located above lower plunger shaft ~7t>>.
A portion .3c:W of trigger :~c~5c_a e:,tends past screw hinge :'iii toward upper p 1 anger shat t ~bC~. A f i. rst fir i pp i rig member :~~c:> i s carr i. ed by c.rpper plc_cnger shaft ~bri and is biased away from the left wall of housi rig ~~3t:> by compressi on spri. rig .'~~. The resi 1 i. ent bi as i s i mparted to tri gger .~~c'~. An i denti cal beari rig assembl y =c_r as shown in FIGS. 1-4 may also be incorporated in the dual cylinder Gaulk:ing gun. Compression spring 34c:~ imparts an opposing resilient bias to trigger Tcoc~~. A second grip 3~i~ e:, tends downwardl y f rorn i nsi de housi. rig 28c~, straddl es 1 ower p1 ~cnger shaft 27~, and protrudes upwardly outside housing 28U.
In operation, trigger ~~n:r is depressed and pivots about screw hinge ."ir:r. The r_tpper pcrrti.on .'"~:W o~F trigger .Tc'_~iy including bear i ng assemb 1 y :'r:r, dr~:i ves gr i p :'?o as tr i gger .. cai r i s depressed .
As grip .'~r:r is driven forward it engages upper plunger shaft ~bi~
and drives bath shaft<a ~7~:~ and ~b~i forward through hor_rsing ~~3r:r.
As trigger .Tr:y~:r is rele~asPd, it is biased hack:: to its original.
position by compre<.ssion spring :'4t~. Lik:ewise, grip .~y~r returns to its original position as a result of spring .~"~c:r. However, gr i p Wc7 wi l l engage p l anger shat t 27r~ to prevent the shat is 26r~.
and ?7ro frorn back:-wl i. di. ng. TI-re above-descri. bed operati an i s repeated to drive bath p1r_rnger shafts ~7r:r and ~~b~i incrementally forward until tlhe caulk: cylinder is depleted and/or, the operator desires to stop. At this point grip .'S~ can be depressed to release all pressure an plunger shaft ~7c~. An operator may grasp the junction of plunger shafts ?br:r and ~7~~ far convenient a>: tracti on From a twi n coal 4~ cyl i nder (not shown ) . The Gaul k:
cylinder can then be easily removed and discarded.
try operating directly an upper plunger shaft ~Wi, the drive mechani sm of the present i nvent i an operates more easi 1 y than prior art dual cylinder caulking guns, yet the manufacturing costs are lower.
In addition, a twin caulk: cartridge may be secured in place by tightening screw 4~n~a which is threaded into the left wall of housing '~8r~. The head of screw 4c~r~ buts the caulk: cylinder and, when e.rtended, secures the cylinder against frame '~9~1.
~- 13 -2056$4 Snap-on piston assemblies 4~~~ are also provided at the ends of p l anger shat is 2b~n and ~70.
FIG. 9 illustrates a snap-on piston assembly 45~n in mare I
detail. Piston assembly 45« includes a piston 455', and a hollow I
cylindrical base Obey an which piston 455 is mounted. The mid- ~I
section of base 4bn i=. defined by a reduced diameter channel. A
smal l bare hol a 4b5 e;<:tends from the outer peri phery o-F the il channel through a wal 1 of base 4bC~ to the hot 1 ow thereof . The diameter of bore hole 465 is tapered to provide a seating for a small ball bearing 51~:~. E~all bearing 51t~ sits within bore hole ~I~
465 such that the ser_t.ion of the periphery of ball bearing 51~s e;; tends s1 i ght I y i nto the hol 1 ow of base 4~bc_~. A compressi an r i ng 5ycy f i is aver bal 1 bear i ng 51 c'~ and si is f 1 ash wi th i n the recessed I
channel of base 46~:~. Compression ring 5~~:~ biases ball bearing 51 ~5 towards the hol 1 ow of base 4b~:~. An annul ar groove 5.~:co i s cut i i into the end of each plunger shaft. When the plunge shaft is I
f u1 1 y i nserted wi thi n base 4b~~, bal 1 beari ng 51~o e;;tends i nto groove 5~i_~ such that f i ston 455 i s rel easi bI y 1 ocl.:ed on the end ' I
of the plunger shaft. A sharp pull on piston,455 will overcome the compressive force of band 52U and piston 455 can be removed from the shaft. Many shapes and sues of pistons 455 may be easily interchanged with this assembly in order to accommodate I
the various twin caulk cartridges now available.
I
Various modifications and alterations of this invention will II
be apparent to those skilled ion the art without departing from ii the spirit and scope crF the invention.
_ 14 _
Claims (38)
1. A caulking gun, comprising:
a frame;
a plunger including a plunger shaft for forwardly urging a caulking composition;
plunger driving means, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to the plunger shaft and protruding upwardly beyond the plunger shaft;
a trigger pivot located above said plunger shaft;
a trigger extending upwardly within the housing and pivoting about said trigger pivot;
a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit directly frictionally engaging said first grip, and said first grip being driven by said bearing bit for advancing the plunger, a first compression spring oppositely biasing said first grip against the frictional engagement with said bearing;
bit; and plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and having a portion operable for releasing plunger pressure to allow manual retraction of said plunger.
a frame;
a plunger including a plunger shaft for forwardly urging a caulking composition;
plunger driving means, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to the plunger shaft and protruding upwardly beyond the plunger shaft;
a trigger pivot located above said plunger shaft;
a trigger extending upwardly within the housing and pivoting about said trigger pivot;
a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit directly frictionally engaging said first grip, and said first grip being driven by said bearing bit for advancing the plunger, a first compression spring oppositely biasing said first grip against the frictional engagement with said bearing;
bit; and plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and having a portion operable for releasing plunger pressure to allow manual retraction of said plunger.
2. The caulking gun according to claim 1, wherein said bearing bit is formed from a low friction material.
3. The caulking gun according to claim 1, wherein said bearing bit is formed from brass.
4. The caulking .gun according to claim 1, wherein said bearing bit is formed from oil impregnated sintered metal.
5. The caulking gun according to claim 1, further comprising adjustable mounting means for adjustably retaining said bearing bit on said trigger, said mounting means allowing said bearing bit to be positioned and secured along said portion of said trigger above said trigger pivot.
6. The caulking gun according to claim 5, wherein said mounting means further comprises, an elongate slot formed in said portion of said trigger above said trigger pivot, and a set screw passing through said slot and threaded into said bearing bit for retaining said bearing bit against said trigger.
7. The caulking gun according to claim 6, wherein said portion of said trigger above said trigger pivot is defined by indicia adjacent said slot for gauging a position of said bearing bit.
8. The caulking gun according to claim 1, wherein said handle has opposing sides and one of said sides is formed with a bore-hole for receiving a tip of a cartridge, whereby said tip is severed when said trigger is pivoted.
9. The caulking gun according to claim 1, further comprising an adjustable trigger stop for limiting the pivoting of said trigger to a predetermined arc.
10. The caulking gun according to claim 9, wherein said adjustable trigger stop further comprises, an elongate strut housed within said handle for restricting a pivoting arc of said trigger, a stem passing through said handle and through one end of the strut, a selecting knob mounted on said stem externally of said handle for selecting a pivoting arc of said trigger by alignment of said strut.
11. The caulking gun according to claim 10, wherein a side of said handle is formed with a plurality of bore-holes spaced equidistant from said stem, and another end of said strut is provided with a protruding pin positionable by said selecting knob within one of said bore-holes, whereby said pivoting arc of said trigger can be incrementally selected.
12. A twin-cylinder caulking gun, comprising:
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a cartridge, said first and second plunger shafts being joined at one end, plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being located to said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper portion of the trigger extending upwardly within the housing past said trigger pivot, bearing means mounted on said upper portion of said trigger and directly frictionally engaging said first grip, said first grip being driven by said bearing means for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the frictional engagement with the upper trigger portion; and dual plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said plunger.
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a cartridge, said first and second plunger shafts being joined at one end, plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being located to said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper portion of the trigger extending upwardly within the housing past said trigger pivot, bearing means mounted on said upper portion of said trigger and directly frictionally engaging said first grip, said first grip being driven by said bearing means for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the frictional engagement with the upper trigger portion; and dual plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said plunger.
13. The caulking gun according to claim 12, wherein said handle has opposing sidles and one of said sides is formed with a bore-hole for receiving a tip of a cartridge, whereby said trigger severs said cartridge tip when said trigger is pivoted.
14. The caulking gun according to claim is 12, further comprising an adjustable trigger stop for limiting a pivoting arc of said trigger.
15. The caulking gun according to claim 14, wherein said adjustable trigger stop further comprises, an elongate strut housed within said handle for engaging said trigger when pivoted, a stem passing through said handle and through one end of said strut, a selecting knob mounted on said stem externally of said handle for selecting an incremental pivoting arc of said trigger by alignment of said strut.
16. The caulking gun according to claim 15, wherein a side of said handle is formed with a plurality of bore-holes spaced equidistant from said stem, and another end of said strut is provided with a protruding pin positionable by operation of said selecting knob within one of said bore-holes, whereby incremental pivoting arcs of said trigger can be selected.
17. A twin-cylinder caulking gun, comprising:
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a twin-cylinder cartridge, said first and second plunger shafts being joined at one end;
plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft and protruding upwardly beyond said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper portion of said trigger extending upwardly in the housing beyond said trigger pivot and straddling said first plunger shaft, a bearing bit mounted on said upper portion of said trigger above said first plunger shaft, said bearing bit directly frictionally engaging said first grip, and said first grip being driven by said bearing bit for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the frictional engagement of said bearing bit;
and plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said dual plunger.
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a twin-cylinder cartridge, said first and second plunger shafts being joined at one end;
plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft and protruding upwardly beyond said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper portion of said trigger extending upwardly in the housing beyond said trigger pivot and straddling said first plunger shaft, a bearing bit mounted on said upper portion of said trigger above said first plunger shaft, said bearing bit directly frictionally engaging said first grip, and said first grip being driven by said bearing bit for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the frictional engagement of said bearing bit;
and plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said dual plunger.
18. The caulking gun according to claim 17, wherein said bearing bit is formed from a low friction material.
19. The caulking gun according to claim 18, wherein said bearing bit is formed from brass.
20. The caulking gun according to claim 18, wherein said bearing bit is formed from a sintered and oil impregnated metal.
21. The caulking gun according to claim 18, further comprising an adjustable mounting for retaining said bearing bit, said bearing bit being selectively movable relative to said adjustable mounting along said upper portion of said trigger.
22. The caulking gun according to claim 21, wherein said mounting further comprises, an elongate slot formed in said upper portion of said trigger, and a set screw passing through said slot and threaded into said bearing bit for retaining said bearing bit against said trigger.
23. The caulking gun according to claim 22, wherein said portion of said trigger above said trigger pivot is defined by indicia adjacent said slot for gauging a position of said bearing bit.
24. A twin-cylinder caulking gun, comprising:
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a twin-cylinder cartridge, said first and second plunger shafts being joined at one end;
quick-release pistons mounted on another end of the first and second plungers, said pistons being adapted to snap on and off of said first and second plunger shafts;
dual plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft, a trigger pivoted to the handle at a location above the second plunger shaft, bearing means mounted on the trigger directly frictionally engaging said first grip, and said first grip being driven by said bearing means for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the frictional engagement with said trigger; and dual plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and being operable to release dual plunger pressure to allow manual retraction of said dual plunger.
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a twin-cylinder cartridge, said first and second plunger shafts being joined at one end;
quick-release pistons mounted on another end of the first and second plungers, said pistons being adapted to snap on and off of said first and second plunger shafts;
dual plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft, a trigger pivoted to the handle at a location above the second plunger shaft, bearing means mounted on the trigger directly frictionally engaging said first grip, and said first grip being driven by said bearing means for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the frictional engagement with said trigger; and dual plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and being operable to release dual plunger pressure to allow manual retraction of said dual plunger.
25. The twin-cylinder caulking gun according to claim 24, wherein said quick-release pistons each comprise a circular piston head and a hollow cylindrical base, said base being mountable on said other end of the first and second plunger shafts.
26. The twin-cylinder gun according to claim 25, wherein said other end of the first and second plunger shafts further comprises an annular groove encircling each said shaft, and wherein said base of each of said quick-release pistons is provided with a detent means protruding into the hollow of said base and adapted to fit in an annular groove of a respective one of said plunger shafts to releasably secure said piston thereto.
27. The twin-cylinder caulking gun according to claim 26, wherein said detent means further comprises a tapered bore-hole through a side of said base, a ball-bearing seated in said bore-hole and extending into the hollow of said base, and a compression ring encircling said base and biasing said ball-bearing into said bore-hole.
28. The twin-cylinder caulking gun according to claim 24, further comprising stabilizing means for securing a twin-cartridge against said twin-cylinder caulking gun frame.
29. The twin-cylinder caulking gun according to claim 28, wherein said stabilizing means comprises a stabilizing screw mounted on a forward wall of said housing and protruding outward to a twin-cylinder cartridge, said stabilizing screw having a head biasing said cartridge, whereby said stabilizing screw can be screwed outward from said forward wall to forcibly hold said twin cartridge against said frame.
30. A caulking gun, comprising:
a frame;
a plunger including a plunger shaft for forwardly urging a caulking composition;
plunger driving means, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to the plunger shaft and protruding upwardly beyond the plunger shaft;
a trigger pivot located above said plunger shaft;
a trigger extending upwardly within the housing and pivoting about said trigger pivot;
a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit providing a direct slidable engagement along a face of said first grip, and said bearing bit operating to cam the first grip as said trigger is pivoted to grip and advance the plunger;
adjustable mounting means for adjustably retaining said bearing bit on said trigger, said mounting means allowing said bearing bit to be positioned and secured along said portion of said trigger above said trigger pivot;
a first compression spring oppositely biasing said first grip against the operative engagement with said bearing bit; and plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and having a portion operable for releasing plunger pressure to allow manual retraction of said plunger.
a frame;
a plunger including a plunger shaft for forwardly urging a caulking composition;
plunger driving means, said plunger driving means further comprising, a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to the plunger shaft and protruding upwardly beyond the plunger shaft;
a trigger pivot located above said plunger shaft;
a trigger extending upwardly within the housing and pivoting about said trigger pivot;
a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit providing a direct slidable engagement along a face of said first grip, and said bearing bit operating to cam the first grip as said trigger is pivoted to grip and advance the plunger;
adjustable mounting means for adjustably retaining said bearing bit on said trigger, said mounting means allowing said bearing bit to be positioned and secured along said portion of said trigger above said trigger pivot;
a first compression spring oppositely biasing said first grip against the operative engagement with said bearing bit; and plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and having a portion operable for releasing plunger pressure to allow manual retraction of said plunger.
31. The caulking gun according to claim 30, wherein said mounting means further comprises:
an elongate slot formed in said portion of said trigger above said trigger pivot, and a set screw passing through said slot and threaded into said bearing bit for retaining said bearing bit against said trigger.
an elongate slot formed in said portion of said trigger above said trigger pivot, and a set screw passing through said slot and threaded into said bearing bit for retaining said bearing bit against said trigger.
32. The caulking gun according to claim 31, wherein said portion of said trigger above said trigger pivot is defined by indicia adjacent said slot for gauging a position of said bearing bit.
33. A twin-cylinder caulking gun, comprising:
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a cartridge, said first and second plunger shafts being joined at one end;
plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising:
a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper portion of the trigger extending upwardly within the housing past said trigger pivot, bearing means mounted on said upper portion of the trigger and directly and frictionally engaging said first grip, said first grip being driven by said bearing means for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the operative engagement with the upper trigger portion; and dual plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said plunger;
an adjustable trigger stop for limiting a pivoting arc of said trigger, said adjustable trigger stop further comprising:
an elongate strut housed within said handle for engaging said trigger when pivoted, a stem passing through said handle and through one end of said strut, a selecting knob mounted on said stem externally of said handle for selecting an incremental pivoting arc of said trigger by alignment of said strut, whereby a side of said handle is formed with a plurality of bore-holes spaced equidistant from said stem, and another end of said strut is provided with a protruding pin positionable by operation of said selecting knob Within one of said bore-holes to allow incremental selection of a pivoting arc of said trigger.
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a cartridge, said first and second plunger shafts being joined at one end;
plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising:
a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper portion of the trigger extending upwardly within the housing past said trigger pivot, bearing means mounted on said upper portion of the trigger and directly and frictionally engaging said first grip, said first grip being driven by said bearing means for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the operative engagement with the upper trigger portion; and dual plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said plunger;
an adjustable trigger stop for limiting a pivoting arc of said trigger, said adjustable trigger stop further comprising:
an elongate strut housed within said handle for engaging said trigger when pivoted, a stem passing through said handle and through one end of said strut, a selecting knob mounted on said stem externally of said handle for selecting an incremental pivoting arc of said trigger by alignment of said strut, whereby a side of said handle is formed with a plurality of bore-holes spaced equidistant from said stem, and another end of said strut is provided with a protruding pin positionable by operation of said selecting knob Within one of said bore-holes to allow incremental selection of a pivoting arc of said trigger.
34. A twin-cylinder caulking gun, comprising:
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a twin-cylinder cartridge, said first and second plunger shafts being joined at one end;
plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising:
a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft and protruding upwardly beyond said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper portion of said trigger extending upwardly in the housing beyond said trigger pivot and straddling said first plunger shaft, a bearing bit mounted on said upper portion of said trigger above said first plunger shaft, said bearing bit providing a direct slidable engagement along a face of said first grip, and said bearing bit operating to cam the first grip as said trigger is pivoted to grip and advance the dual plunger, an adjustable mounting for retaining said bearing bit on said trigger, said mounting allowing said bearing bit to be positioned and secured along said upper portion of said trigger, a first compression spring oppositely biasing said first grip against the operative engagement of said bearing bit; and plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said dual plunger.
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a twin-cylinder cartridge, said first and second plunger shafts being joined at one end;
plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising:
a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft and protruding upwardly beyond said first plunger shaft, a trigger pivot located above said second plunger shaft, a trigger extending upwardly within said housing and pivoting about said trigger pivot, an upper portion of said trigger extending upwardly in the housing beyond said trigger pivot and straddling said first plunger shaft, a bearing bit mounted on said upper portion of said trigger above said first plunger shaft, said bearing bit providing a direct slidable engagement along a face of said first grip, and said bearing bit operating to cam the first grip as said trigger is pivoted to grip and advance the dual plunger, an adjustable mounting for retaining said bearing bit on said trigger, said mounting allowing said bearing bit to be positioned and secured along said upper portion of said trigger, a first compression spring oppositely biasing said first grip against the operative engagement of said bearing bit; and plunger pressure retaining means including a second grip and second spring, the second grip biased by the second spring and having a portion operable for releasing dual plunger pressure to allow manual retraction of said dual plunger.
35. The caulking gun according to claim 34, wherein said mounting further comprises, an elongate slot formed in said upper portion of said trigger, and a set screw passing through said slot and threaded into said bearing bit for retaining said bearing bit against said trigger.
36. The caulking gun according to claim 35, wherein said portion of said trigger above said trigger pivot is defined by indicia adjacent said slot for gauging a position of said bearing bit.
37. A twin-cylinder caulking gun, comprising:
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a twin-cylinder cartridge, said first and second plunger shafts being joined at one end;
quick-release pistons mounted on another end of the first and second plungers, said pistons being adapted to snap on and off of said first and second plungers;
dual plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising:
a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft, a trigger pivoted to the handle at a location above the second plunger shaft, bearing means mounted to said trigger, the bearing means directly frictionally engaging said first grip, and said first grip being driven by said bearing means for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the operative engagement with said trigger;
dual plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and being operable to release dual plunger pressure to allow manual retraction of said dual plunger; and stabilizing means for securing a twin-cartridge within said frame, said stabilizing means further comprising a stabilizing screw mounted on a forward wall of said housing and protruding outward to the twin-cartridge, said stabilizing screw having a head biasing said cartridge, whereby said stabilizing screw can be screwed outward from said forward wall to forcibly hold said twin cartridge within said frame.
a frame;
a dual plunger including parallel first and second plunger shafts for forwardly urging caulking material from a twin-cylinder cartridge, said first and second plunger shafts being joined at one end;
quick-release pistons mounted on another end of the first and second plungers, said pistons being adapted to snap on and off of said first and second plungers;
dual plunger driving means for driving said dual plunger by operating directly on said first plunger shaft, said plunger driving means further comprising:
a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to said first plunger shaft, a trigger pivoted to the handle at a location above the second plunger shaft, bearing means mounted to said trigger, the bearing means directly frictionally engaging said first grip, and said first grip being driven by said bearing means for advancing the dual plunger, a first compression spring oppositely biasing said first grip against the operative engagement with said trigger;
dual plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and being operable to release dual plunger pressure to allow manual retraction of said dual plunger; and stabilizing means for securing a twin-cartridge within said frame, said stabilizing means further comprising a stabilizing screw mounted on a forward wall of said housing and protruding outward to the twin-cartridge, said stabilizing screw having a head biasing said cartridge, whereby said stabilizing screw can be screwed outward from said forward wall to forcibly hold said twin cartridge within said frame.
38. A caulking gun, comprising:
a frame;
a plunger including a plunger shaft for forwardly urging a caulking composition;
a plunger driving means, said plunger driving means comprising:
a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to the plunger shaft and protruding upwardly beyond the plunger shaft;
a trigger pivot located above said plunger shaft;
a trigger extending upwardly within the housing and pivoting about said trigger pivot;
an adjustable trigger stop for limiting a pivoting arc of said trigger to a predetermined arc, said adjustable trigger stop further comprising as elongate strut housed within said handle for restricting a pivoting arc of said trigger, a stem passing through said handle and through one end of said strut, and a selecting knob mounted on paid stem externally of said handle for selecting a pivoting arc of said trigger by alignment of said strut, a side of said handle being defined by a plurality of bore-holes spaced equidistantly from said stem, and another end of said strut having a protruding pin positionable by said selecting knob within one of said bore-holes to allow incremental selection of said pivoting arc of said trigger;
a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit directly and frictionally engaging said first grip, and said first grip being driven by said bearing bit for advancing the plunger;
a first compression spring oppositely biasing said first grip against the operative engagement with said bearing bit; and plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and having a portion operable for releasing plunger pressure to allow manual retraction of said plunger.
a frame;
a plunger including a plunger shaft for forwardly urging a caulking composition;
a plunger driving means, said plunger driving means comprising:
a housing having a downwardly extending handle, a first grip enclosed within said housing, said first grip being linked to the plunger shaft and protruding upwardly beyond the plunger shaft;
a trigger pivot located above said plunger shaft;
a trigger extending upwardly within the housing and pivoting about said trigger pivot;
an adjustable trigger stop for limiting a pivoting arc of said trigger to a predetermined arc, said adjustable trigger stop further comprising as elongate strut housed within said handle for restricting a pivoting arc of said trigger, a stem passing through said handle and through one end of said strut, and a selecting knob mounted on paid stem externally of said handle for selecting a pivoting arc of said trigger by alignment of said strut, a side of said handle being defined by a plurality of bore-holes spaced equidistantly from said stem, and another end of said strut having a protruding pin positionable by said selecting knob within one of said bore-holes to allow incremental selection of said pivoting arc of said trigger;
a bearing bit mounted on a portion of said trigger above said trigger pivot, said bearing bit directly and frictionally engaging said first grip, and said first grip being driven by said bearing bit for advancing the plunger;
a first compression spring oppositely biasing said first grip against the operative engagement with said bearing bit; and plunger pressure retaining means including a second grip and second spring, the second grip being biased by the second spring and having a portion operable for releasing plunger pressure to allow manual retraction of said plunger.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/614,238 | 1990-11-16 | ||
| US07/614,238 US5197635A (en) | 1990-11-16 | 1990-11-16 | Variable thrust caulk dispensing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2055684A1 CA2055684A1 (en) | 1992-05-17 |
| CA2055684C true CA2055684C (en) | 2002-07-16 |
Family
ID=24460406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002055684A Expired - Lifetime CA2055684C (en) | 1990-11-16 | 1991-11-15 | Variable thrust caulk dispensing device |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5197635A (en) |
| EP (1) | EP0486455A3 (en) |
| CA (1) | CA2055684C (en) |
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| US5381931A (en) * | 1994-03-04 | 1995-01-17 | Chang; Peter J. Y. | Caulk dispensing device with multi-position thrust selection dial |
| US5615807A (en) * | 1994-10-12 | 1997-04-01 | Peng; Yuenan | Convertible dripless caulking gun for variant viscosity media |
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| US5720418A (en) * | 1995-08-14 | 1998-02-24 | Illinois Tool Works Inc. | Adjustable tool for dispensing viscous material, such as two-part adhesive |
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| US6435705B1 (en) | 1999-04-16 | 2002-08-20 | Depuy Orthopaedics, Inc. | Apparatus and method for delivering and mixing a liquid bone cement component with a powder bone cement component |
| US6253969B1 (en) * | 1999-11-04 | 2001-07-03 | Ecolab Inc. | Dispenser for viscous material |
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1990
- 1990-11-16 US US07/614,238 patent/US5197635A/en not_active Expired - Lifetime
-
1991
- 1991-11-14 EP EP19910870184 patent/EP0486455A3/en not_active Withdrawn
- 1991-11-15 CA CA002055684A patent/CA2055684C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0486455A3 (en) | 1992-08-26 |
| EP0486455A2 (en) | 1992-05-20 |
| US5197635A (en) | 1993-03-30 |
| CA2055684A1 (en) | 1992-05-17 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKEX | Expiry |