US1828623A - Winding mechanism for rolling screens - Google Patents

Description

Oct. 20, 1931.

G M. SACERDOTE WINDING MECHANISM FOR ROLLING SCREENS filed Dec.

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. a; E WSH N JIEW Patented Oct. 20,, V

3 V 'A ijilieatidni filed beernher 5 This invention relatesitorollingscreens or shades and'mpre particnlarly refers to "a novel and improved arrangement fOi'JWlIldf ing andunwinding a'rolling screen or shade, a

whereby cert'ain important 'adVantagesInay be realized, which similar de vicesher'etefore cally'unifornr while thescreen is-ejxtended from its-inoperative t0 itsfoperati've pO's'i Another Object (if this iny'enti'ongis to pro- "vide, a novelfandin lproved arrangementof rolling-screen 01"shade',fW;hereby a positive Winding a c'ti0nwill be obtainable at an 1 tbrt'ionsand kinking ofthe material. v A

"still further'ohj ect is to provide; in aro'lliing screen or shadeganiextremely simple and" fine mesh Wire netting, produced from light F times, While at thezsame time the tension upiin the Winding-element isflr'nainta'inedg insnrmg cl'oseand smooth winding; preventmg; as a "consequence; the possibility of dis reliable arrangement, "whereby perfect alin'e mentdfthe Wmdinginernber is'assnred atall I times i'and ease 0f -c0ntr0l"andeffective 0pfi-Rolling' screens'are generally inade of very gauge metallic wireywhich is a 'fairlyfiexv ihleand pliable fabricywhi ch' canbejwo'und;

' aregeneral upbnand unwotind from a roller with co'ln parative ea'se'f" This" fabric, howeyerfis not quite as flexible ascloth and the material hais 'ertain springiness' Which makes" it rather cl iffieiiltito Wind it closely upon the roller,

unless some. special arrangementi's' resorted tb; Arrangements rte insure close "winding g y lacking in'deviees'pft'his charaizter,;and the result is that'when a screen Wennd up, its Various cells are detac'hed frdm each other, andthe "fabric isllikely to. become 1 "distorted and-irregular when tension is" ap- After a'eertain peribd ofiisey, a fsereen thus subjected to "the resulting. strain loses its nniformity,its siirface he'cQme-skinked atnuk 'n'ier'ous points,:and the grain of the metal Essa-trimesters f 2, 925; seri l 72,769. m g rapidly crystallizes, hece -hard.j i

ed upon rollers depending on aspring for the Windingaction; after the fashion 'offthe 0rdinary' ro'ller for window shades. .1 1-,

reller by p'ulling: at its free end t extend; the

or some other-v similar device,' is' employed to prevent return metidn 01? the roller; or else the 'screen'itself may be-iocked against obey ing the a-ction' of ithe spring; theitwo "edge-s the screen jrunningiffwithin;{side" rails act- 7 injcr a's'gniding rneans thereform r I I hen' the screen is released, br thespringis-etherwise permitted to rewind-the roller,

the scree'nmay be restrained-tea certain ex tent, slowing up'the. indi11gaetitingtofl re vent its Winding t0b-=ld0selyuppn the relerg a but: this restraining "action cannot be exlted I beyond aeertainIimit; inasmlieh a's-a tension sueh a would be required 'toj" maintain the fabric-close to' 'the' snrfae o'f'the roller'wqnld generally be suflicient to altp'gether preterit 1 the. tenth; or'-thespririg;owing'tothe perf ctfl xi i y io irhe f bri -jlF th r 'inoref'the exertion'j'bfj sneh' a restraining action, requires theexercise of' judgn ent and W I LM h d disadvantage; and in orderjtd maintain said j iis sing a-ibulky easing fqr the roller is a distinct} 5 feasing or top rail: Within' areasonablef s1ze,

answer unsatisfactory co'nd-itiqn isiintro dnced;bythefusefbfa rellerfbfi instiflieient diameter; Compelling the fabric" m be wound I I a -deem: omradi-iis 'whithf *i's tod small ree:

60 1 Theltwo'patent applications above referred .to; relate, respectively, to an Qadj u stable construction- 0f rolling screen frame and roller its texture, and which further assists its tend ency to crystallization. I

This method of construction is furthermore open to one more serious objection. It is obvious that if the screen is to be entirely rewound'upon the roller, the spring actuating the roller must stillbe under sufficient tension to cause winding action at the time when the operation isabout to be completed; this is equivalent to sayingthatthe tension of the spring increases more and more as't-he screen is extended, owing tothe construction of'the device, so that this tension is likely'to become.

' excessive when the screen .is entirely-um wound. This means both that an excessive f-force must be applied in order to operate the screen, and that the screen. becomes sub-.

jected, to an excessive tension when in its extended position this tension may cause undue stretching of; .the fabric, which may, in the long run, produce harmful consequences,xby

' injthe drawings, inwhich destroyingthe uniformity of its weaving.

, T he arrangement forming the object of the w ,Anembodiment'of myinvention is shown Q Fi ,1 is a fragmentary front view in elevation partly sectionediofia self adjustable rolling screen Where the arrangement forming the objeettof the ,present invention is illustr e Fig.2is a similar view showing also the bottom rail and the. operating mechanism, illustrating the application of the device to anarrower window fram'e. [The present invention is an improvement over thedevice' which hasbeenj described and claimed by me in two otherpatent applications filed simultaneously herewith, having for title fAdjustable' rolling screen Serial No. 72,761, patented October2'1, 1930, Patent No. 1,7 7 9,262, and- Clamping mechanism for rolling screens, Serial No. 72,762, patented March 25, 1930, Patent No. 1,751,950, the improvement being more'particulary directed to the winding mechanism" for'the rolling screen which has been considerably'simplified. in the present case and which hasbeen made more reliable in its Operation.

' andto a-novel and improved clamping mechan m. f r mpi e-(the Sid ed es. of th screen when inoperative position. These two features have been embodied in the present invention, practically unchanged and have been represented in the drawings in or der to be described for the sake of clarity;

' but the invention, as stated, refers more particularly to the arrangement. for winding v and unwinding the screen.

'My device consists, essentially, ofa screen or shade 10,'made of suitable fabric, attached at one end, in this case the upper end, to a roller 11,'rotatably mounted within a casing or upper rail 12, and provided at the other end with across member or bottom rail 13,

extending for the entire width of the screen,

by means of which the screen may be operated in one or the other direction. 7

r The bottom railhas the objectof uniformly distributing the force applied to extend the screen; means are also provided to insure correct alignment of the bottomrail at all times, to prevent uneven stretching of the screen, causing saidbottom rail to occupy successive parallel positions throughout its travelfrom onejend ofthe screen frame to the other.

' In the present case, these means are represented by, side belts 1 1, 15, which are at taclied to and wound upon upper pulleys 16, 17 and which run over lower pulleys 18, 19 respectively, each belt being attached to one end-of the bottom rail. The arrangement is such that the movement of the belts is interdependent becausethe up per pulleys are fixed .on the same shaft 20, onwhich the roller 11 is also rotatably mounted; therefore, the bottom ,rail can only move by simultaneous displacement of its ends, and of the belts connected thereto, by equal quantities, corresponding to equal angularmovements of the pulleys. f I

Proper alignmentsiof'the bottom rail and uniform movements of the screen throughout its width, are in any event assured, owing to the fact that the arrangement causes the screen to become closely wound upon the roller, so that any movement of the screen is instantly transmitted, to the roller and through the roller to the entire width of the screen;

.As stated, the roller isrotatably supported upon shaft 20, having its ends inserted within hollow studs 21, 21", one at each end, said studs being riveted. or otherwise secured on to side frame members or side rails 22, 23, which are, placed and secured against the inside surface of the window frame 24,, by

means of1screws or in some other suitable manner in a, vertical position. The studs project inwardly and co-axially to each other in ,ahoriz ontal directionand are formed with a hollow stein portion which acts as a bearing for said shaft 20. Pulleys: 16, 17 are fixed upon shaft. 20 by means of set screws 24, so

that the said pulleys be set on the shaft at whatever distance it may be required to fit V the screen frame within window frames of slightly difi'erent widthss ,StocklwindoWs of he sameare, course, not exactly alike :andthereanay be :a difference :of l Z to in iwidthbetween nnder-j'sized and oversized windows; studs2 l, 21 and'shaft 20,-ar madeso/that when the" screen frame is-niounted ma window frame lofla width smaller. than-nbrmalbyzsay, A1,

the endsof the shaft almost touch-the bottom. of the openings in the studs; and 'when the. screen frame is mountedin an oversized :win-

dowifram e, the widthof which is, say 44; in

I excess of normal, the distance between-the twostuds isstill less-than the lengthiof the shaftjand sufficient bearing siirfacaisstill provided.v bysaid studs "for said shaft; iPul .leys 16, l7,-,can therefore beset in position on theTshaft by means of set f screws 24' so as'lto cause said shaft to remain centrally located betweensaidstuds 1 y The' lower pulleys 18, 19

same plane-,;with;the upper pulleys"; however,

owingtogthe"fact -that'the upper,pulleys are ofa larger diameter than .theiower]-pu11 y s,- the center ofrotation ofthe upper pulleysis forwardly displaced :in relation to the 'ter of. the :lower pulleys; so that the inner strand of each. belt to which the bottom rail is attached, is substantially inline Wanamrearl and'thecir'cumferenc'e ofthe screen r oller: whenv such roller is at its maximum: diam eter, the screen'mow-n-gnpor down as close -=as possible. to the window sashes; V Accord:

ingly, thebelts are guided fromthe upper pulleys to andintothe said rails by suitable & to deflecting means, not-shown.

; In relation toxthe bottom rail the screen and the belts form a lc'ontinuation;-" but said screens and belts are so arranged in relation .to-the'screen roller and totheupperpulleys length of window frames of the same stock. size an'dtherefore, pulleys 16, 17' maybe set 7 upon the shaft 20 fordiiferen't distances be however, to set the screen roller'centrally' of the frame at all times, and this maytbei automatically obtainedin'a:mannersimilar v Y to the one described in my other patent appli that when the sereen is unwound from the roller,-the belts will be wound upon the "pul leys; -and vice'yersai *"As-the screen and belts are thus wound and unwound, the diameterof the roller and the. pulleys vary and' litake. advantage of this circumstance in creating I a tension upon the screen =at "alllt'imestw hich,

although i suflicient for the purpose of keep 4 ing the screen :taut is never excessive, Varyingfbetween O limits whi'ch are not far apart. g r s ,The arrangement illustrated, as stated, is

preferably made adjustable for slight varia tions which may occur in the width and tween the side rails; It isv also necessary,

aiideabiy mounted upon ,said stud: rivetssuch as; 28, riyetedato the side rails, :so' as to remain in the 'fcatioii'rentitled Adjustable .rOllingE screeiWi' Byreferringto thefdrawinjgs it is. seenxthat fcollarsl 25, 26 are? attached to the. roller at the same distance from I each I thereof. The roller. is mounted centrally upon shaft "20 by "causing the .hub OfdiscBO-LandE alcollar 531", fixed on shaftQO to abut inversely against said collars 25, 26so 'th'atan axial moyernent -eof.the 'roller inrelation. totheI shaft .isi p re- I yented.-- BetWeenI said collars .25, 26 and :1 whee'l- 16,17 respectivelyllnay be interposed pressure springs 32,33, which are of the same a :size'iand which by I pressing against said pul-f 1; :leysi and wuarwm cause the shaft to autoinatically assume acentrall-position in "rela tionlto 1 its bearingsiiwhen set 1 screws 24', are loosened. OIice the frame and roller are mounted in position,;set*screws, 24 maybe once more made-xoperatiyealtoit fix the r shaft and 1 the shaft will remain; permanently (set i in its proper place. l-lloweyeigkthediifera encesbetween' widthsof windowsof the same i g a stock size-are so sniall that the properposi- Q tion: of thesrollerand shaft maybe gauged ":witl'ioutfthe-assistance of the spring s 'so that f springs 32, 83 may be omitted if desired. i

on the otherihand,;if springs 32,33 are usedypulleys' 1-6 v may be --mounted. upon i I the-shaft -so as to beaXially'inovzibleonsaid I 'shaftihbutconstrained; to rotate" therewith, p for instance, by means of key connection'32", '33Q shown in dotted lines 'in'lFig, 2; and in 1 "this' -case, the use of the set serews may-be;jomitted'ythe pulleys being held in their 'prop- 1 [er position by thepressure exerted byfsprings 1n the senseof the width" of thescreen; By

downi i s transmitted to ths s'ereen orjfto the side; belts and the' lengthi' of the bottemfrail" at alltimes 'adjusts itself, automat'ical-lytothfe "clistancebetween thebelts; o

It will be' obseryed that thearrangement describedis veryfieirible andeffectiVeflnas-Q I I nuch as it will operate equally'well fifth 7 side :railsdo not-run in, absolutely pare11e 1 1 directions? flhis ism-1; important advantage "jbe'cause, owing to-the" quantity production; j methods, se an theirinanufaoture, window :fmmes' are 1 rarely of the samee xact' d'imen- 's'ions a nel' the'widthbriheightjor both of'the same franie may Vary atdiffeiientlpoiiits;" 55

hsing'anadjustableframe teenage n I (ether-words,the feature 'o'fa'djnstabilityf must] .w s v r a sze z hes mers Y ndow" framed-imply the ne essity of a at the same time preventing possible bulgextend first to the screen frame, which must be capable of adapting itself, within limits, to these variations, and'then to the roller and screen, which must be. adjustable, possibly automatically, to the. dimensions thus acquiredby the screen frame. At the same I time, it is highly desirable'that a neat outside appearance-of the device'be preserved.

Y r111 connection with the winding mechanism to which the present invention more particularly refers, I prefer to also use a mechanism forflclamping the side edges of-the screen when extended in its operativeiposition, in order to insure tight closing at the edges of the windowtowhich the screen is applied,

'- plication'for:patent on-Fclamping mechanism for rolling screens, filed simultaneouslyherewith. ,Y 7 i j The drawings are mainly intended forthe purpose of illustration, andnot ina limiting sense; since it is obvious that minor changes maybe made in the constructionof the device,

'withoutsubstantially departing from the inventive idea, Therefore, I reserve myself the 1 .right to carry myinvention into practice in all those waysand manners which may enter,

, fairly, into the scope of the appended claims.

I claim 4 1., In a. device of the class described, comprising two side framemembers, a shaft r0- tatably mounted between said members, a

:roller rotatably mounted upon said shaft, a

, screen adaptedto be'wouud upon said roller, twolside pulleys carried by said shaft, flexible elements attached'at one end to the free end of said screen and at the other end to said pulleys, ,and a spring inserted within said roller connecting said roller to said shaft causing said flexible member to be wound upon said pulleys as said screen is unwound from said roller, means for adjust- .ing the position of said pulleys along and forefixing the same upon said shaft so as to positionsaid shaft between said two side members, preventing axial displacement of said shaft in relation thereto, and "means for preventing axial displacements of said roller in relation to said shaft,

Ina deviceof the class described, co1nprising two s devframe members, a shaft row 't-atablyl mounted betweensaidinembers, a a} R5 rollerrotatably mounted upon said shaft, a

screen adapted to be wound upon said roller, two side pulleys fixed upon said shaft restraining the same against axial movements in relation to said side members, flexible elen'ients-att'ached.atone end to the free end of said screen and at the other end to said pulleys and a spring inserted within said roller connecting said. roller to said shaft, causing said flexible members to. be wound upon's'aid pulleys as said screen is unwound from said roller, and means interposed between said pulleys and said roller for centering said rollerupon said shaft in relation to said side pulleys. 3. In a devicev of the'class described, comprising two side frame members, a shaft rotatably mounted-between. said members, a roller rotatably mounted upon said shaft, a screen adapted to be wound upon said roller, two side pulleys fixed upon saidfshaft restraining the same against axial movements 1n relation to said side members, flexible elements attached at one end to the free end of said screen and at theother endfto said pulleys and a spring-inserted within said roller connectlng said roller to saidshaft, causing said flexible members'tobe wound upon said pulleys as said screen isunwound from said r0ller,and means interposed between said pulleysand said roller for automatically centering said roller upon said shaft in relation to said side,pulleys.- 1 I 4. In a device of the class described, compris ng two side frame members, 'a'shaft rotatably mounted between said. "members, "a roller rotatablymounted upon said shaft, a screen adaptedto be'wound upon said roller, two side pulleys loosely carried by and longitudinally adjustable on 'saidshaft, flexible elemen s attached atone end to the free end of said screen and at the other end to said pulleys. :and aspring inserted within said rollefconnecting said roller to said'shaft, causing said flexible member to be wound upon said pulleys as said screen is unwound from's aid roller, means for fixing the pulleys upon'said shaft so as to position said shaft between said twoside members, and a spring

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