US20130134188A1 - Cartridge-type dispenser - Google Patents
Cartridge-type dispenser Download PDFInfo
- Publication number
- US20130134188A1 US20130134188A1 US13/700,614 US201113700614A US2013134188A1 US 20130134188 A1 US20130134188 A1 US 20130134188A1 US 201113700614 A US201113700614 A US 201113700614A US 2013134188 A1 US2013134188 A1 US 2013134188A1
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- United States
- Prior art keywords
- piston
- main body
- cartridge
- end portion
- trunk portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D83/00—Containers or packages with special means for dispensing contents
- B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
- A61C5/62—Applicators, e.g. syringes or guns
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- 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
- B05C17/00576—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 characterised by the construction of a piston as pressure exerting means, or of the co-operating container
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D83/00—Containers or packages with special means for dispensing contents
Definitions
- the present invention relates to a cartridge-type dispenser suitable for extruding viscous materials such as composite resin used for dental treatment or the like, wherein a contents-extruding piston does not fall easily out of a dispenser main body and yet is capable of extruding the contents with a smooth action.
- Paste materials with high viscosity are often used in dental treatment or the like and generally extruded from a syringe-type dispenser or a cartridge-type dispenser.
- contents are extruded from a nozzle by applying a push-in force to a plunger fitted in a syringe main body to slide the plunger in the syringe main body.
- the cartridge-type dispenser wherein a piston is arranged in a cartridge main body (referred to below simply as a “main body”), the contents are extruded by fitting the main body to a separately prepared push-in tool (trigger-type push-in tool) and pushing in the piston.
- a separately prepared push-in tool Trigger-type push-in tool
- the contents filled in the main body are disposed once used in a single treatment, and from perspectives of quality assurance and hygiene, a dispenser of this type is frequently used in recent years.
- a dispenser of this type is frequently used in recent years.
- the piston since there is a variation and the like in molding accuracy of the piston and the main body which constitute the dispenser, in case where a diameter size of the piston is small, the piston can be easily disengaged from the main body.
- the piston can be disengaged from the main body due to an increase in an inner pressure when the piston is installed after the contents have been filled in, and as a result, assembly becomes laborious, and moreover, an operation of extruding the contents can be slowed down, which sometimes causes malfunction in which the contents cannot be smoothly extruded.
- the present invention provides a cartridge-type dispenser comprising: a cartridge main body defining a filling space for contents and provided with an extrusion nozzle at a front end portion of the cartridge main body; and a piston slidably arranged in the filling space of the cartridge main body and configured to cause the contents of the filling space to be extruded from an end of the extrusion nozzle in response to application of a push-in force.
- the piston includes: a trunk portion having an outer circumferential wall arranged opposite to an inner circumferential wall of the cartridge main body so as to define a gap therebetween; a front end wall portion provided at one end portion of the trunk portion in direct contact with the contents of the filling space; and a rear end wall portion provided at another end portion of the trunk portion to be pressed with a rod of a push-in tool for the application of the push-in force to the piston itself.
- the outer circumferential wall of the trunk portion is provided with a protrusion, which is in contact with the inner circumferential wall of the cartridge main body to form a sliding part of the piston without sealing off an interior of the cartridge main body.
- Provision of a protrusion on the trunk portion of the piston, as a sliding part of the piston, makes it possible to reduce the contact area between the piston and the inner circumferential wall of the main body. Accordingly, even when the piston is firmly fitted to the main body at the sliding part to prevent the piston from being easily disengaged from the main body, the piston is able to slide smoothly, thereby improving operability. Furthermore, a tiny gap is formed between the piston and the main body in a part of the piston other than the sliding part. As a result, when the piston is assembled after the contents are filled in, air remaining in the main body is discharged to the outside through the gap, and the inner pressure is not increased.
- the sizes of the one end portion and the other end portion of the trunk portion of the piston are D 1 and D 2 (where D 1 is closer to a front end portion, and D 2 is closer to a rear end portion), and the size of the interior of the main body is X
- a difference between the sizes D 1 , D 2 and X i.e. the gap formed between the main body and the trunk portion of the piston, satisfies the conditions X ⁇ D 1 ⁇ 1 mm and X ⁇ D 2 ⁇ 1 mm, because in this case the contents are in a good state of preservation for a longer period of time.
- the sizes of the one end portion and the other end portion of the trunk portion of the piston, inclusive of the protrusion are D 3 and D 4 (where D 3 is closer to the front end portion, and D 4 is closer to the rear end portion)
- a difference between the sizes D 3 , D 4 and X i.e. the size when the protrusion is fitted to the main body, satisfies D 3 ⁇ X ⁇ 0.01 mm and D 4 ⁇ X ⁇ 0.01 mm, because in this case the piston is further prevented from disengagement.
- 0.5 mm ⁇ D 3 ⁇ X ⁇ 0.01 mm and 0.5 mm ⁇ D 4 ⁇ X ⁇ 0.01 mm it is preferable that 0.5 mm ⁇ D 3 ⁇ X ⁇ 0.01 mm and 0.5 mm ⁇ D 4 ⁇ X ⁇ 0.01 mm.
- the length D 5 needs to be determined as appropriate, because an appropriate length of D 5 depends on a length of the interior of the main body in the push-in direction, as well as a stroke of the push-in tool.
- FIG. 1A shows a general embodiment of a dispenser according to the present invention in a cross sectional lateral view
- FIG. 1B shows the general embodiment of the dispenser according to the present invention when the dispenser shown in FIG. 1A is viewed from a rear end wall thereof.
- FIG. 2 is a perspective appearance view of a piston arranged in the dispenser shown in FIGS. 1A and 1B , with three protrusions provided on a cylindrical trunk portion thereof.
- FIG. 3 shows another example of the piston favorably applicable to the present invention in which middle sections of the protrusions provided in the piston are removed to divide the ribs into upper and lower end sections so as to further reduce the contact area between the piston and the main body.
- FIG. 4 shows another example of the piston favorably applicable to the present invention in which the protrusions are provided in a portion of the piston other than the end portions thereof with respect to FIG. 3 .
- FIG. 5 shows another example of the piston favorably applicable to the present invention in which a single protrusion is helically formed.
- FIG. 6 shows another example of the piston favorably applicable to the present invention in which the trunk portion of the piston is depressed so that the piston does not make contact with the main body even when the piston itself is deformed.
- FIG. 7 shows another example of the piston favorably applicable to the present invention in which the protrusions provided in the upper and lower end portions of the piston shown in FIG. 6 are joined.
- FIGS. 1A and 1B show a general structure of a dispenser according to the present invention in a cross sectional view
- FIG. 2 is a perspective appearance view of a piston arranged in the dispenser shown in FIG. 1A and FIG. 1B .
- Reference numeral 1 in the drawings denotes a main body defining a filling space M for contents.
- the main body 1 can be made of high-density polyethylene (HDPE), low-density polyethylene (LDPE), polypropylene (PP), acryl, polyethylene terephthalate (PET), polyoxy-methylene (POM), polybutylene terephthalate (PBT), and the like.
- the main body 1 includes at a front end portion thereof an integrally formed extrusion nozzle 1 a and also includes around an outer circumferential wall of a rear end opening 1 b thereof a flange 1 c for linkage to a separately prepared push-in tool (not shown).
- the main body 1 is preferably made of PBT, in particular.
- Reference numeral 2 denotes the piston arranged in the main body 1 .
- the piston 2 has a trunk portion 2 a having an outer circumferential wall arranged opposite to an inner circumferential wall of the main body 1 so as to define a gap therebetween, a front end wall portion 2 b provided at one end portion of the trunk portion 2 a in direct contact with the contents of the filling space M, and a rear end wall portion 2 c provided at another end portion of the trunk portion 2 a to be pressed with a rod (not shown) of a push-in tool for application of a push-in force to the piston 2 itself.
- a cylinder having sizes (diameters) D 1 and D 2 at the one end portion and the other end portion (where D 1 is closer to the front end wall portion 2 b , and D 2 is closer to the rear end wall portion 2 c ) and a size D in the middle portion of the trunk portion 2 a in a push-in direction is used, where D 1 , D 2 , and D are equal.
- Reference numeral 3 denotes longitudinal ribbed protrusions integrally formed on the trunk portion 2 a of the piston 2 .
- the protrusions 3 are provided at three positions on the outer circumferential wall at regular intervals such that an end of each protrusion 3 contacts the inner circumferential wall of the main body 1 for sliding in the main body 1 in conjunction with a movement of the piston 2 .
- sizes D 3 and D 4 of the piston 2 at the one end portion and the other end portion are larger than an inner diameter X of the main body 1 .
- the material for the piston 2 may comprise elastomer, rubber, LDPE (such as linear low density polyethylene (LLDPE)), HDPE, PP, acryl, and the like. Among others, LDPE is preferably used.
- Reference numeral 4 denotes a nozzle cap mounted on the extrusion nozzle 1 a to close off an extrusion orifice of the extrusion nozzle 1 a .
- the nozzle cap 4 is linked by engagement means, such as undercuts.
- the nozzle cap 4 may be screwed by a thread.
- a fitting effect provided by the above engagement means or screw structure allows positioning of the cap, to thereby facilitate the assembling and prevent disengagement of the cap when the cap is loosely mounted and also prevent damage to the cap when the cap is tightly or deeply mounted.
- a hardly deformable nozzle cap 4 In case where the nozzle cap 4 is provided with the fitting effect, it is preferable to employ a hardly deformable nozzle cap 4 .
- the reason is that, although an easily deformable nozzle cap 4 has an advantage that it can be mounted even when the size is not precisely set, such an easily deformable cap tends to be disengaged or to be damaged.
- HDPE, LDPE, PP, acryl, and the like can be used as the material of the nozzle cap 4 , and in particular, HDPE is preferably used.
- An outer diameter of the extrusion nozzle 1 a is preferably as small as possible in the dental treatment, and therefore the inner diameter D 6 is necessarily small.
- the inner diameter D 6 of the extrusion nozzle 1 a it is preferable that 0.01 ⁇ D 6 /X ⁇ 0.60, and it is further preferable that 0.25 ⁇ D 6 /X ⁇ 0.55.
- the piston 2 when the piston 2 is fitted to the main body 1 , a contact part between the piston 2 and the main body 1 is formed only by the protrusions 3 . Accordingly, the piston 2 is able to slide smoothly even in a fitting state (i.e. the state in which the piston 2 cannot undergo disengagement) where the protrusions 3 are in a tight contact with the inner circumferential wall of the main body 1 .
- a tiny gap P is formed between the piston 2 and the main body 1 in a region where the protrusions 3 are not provided (refer to FIG. 1A ).
- FIGS. 3 to 7 show different embodiments of the piston favorably applicable to the cartridge-type dispenser according to the present invention.
- FIG. 3 shows the piston 2 in which the protrusions 3 are provided at the end portions of the trunk portion 2 a of the piston 2 while a shape of the trunk portion 2 a remains cylindrical.
- contact of the piston 2 with the main body 1 is made at the protrusions 3 provided at a front end portion and a rear end portion of the piston 2 . Accordingly, a contact area is further reduced, and operability is further improved.
- FIG. 4 shows the piston 2 in which the protrusions 3 are provided in a portion of the trunk portion 2 a other than the end portions thereof while the shape of the trunk portion 2 a remains cylindrical.
- the contact area is further reduced, and operability is further improved.
- FIG. 5 shows the piston 2 in which the single protrusion 3 is helically formed while the shape of the trunk portion 2 a remains cylindrical, which shows an example of the smallest number of the protrusion still satisfying demand characteristics of the present invention.
- the protrusions 3 may be provided only at the end portions of the trunk portion 2 a , over an entire length of the trunk portion 2 a , or even alternately provided at the front end portion and the rear end portion of the trunk portion 2 a of the piston 2 . Particularly, when the protrusions 3 are provided alternately at the front end portion and the rear end portion of the trunk portion 2 a of the piston 2 , intrusion of light through the gaps is better prevented, and therefore quality of the contents is maintained in a more stable manner.
- the bodies made of PBT and the pistons made of the materials described below were prepared, and a vibration test, a depressurization test, a loading test, and a curing test were conducted to evaluate performance of each dispenser.
- the main body fitted with a piston was laid on a pan secured to a vibration machine (TUBE MIXER TRIO HM-2F manufactured by As One Corporation) and vibrated for one minute at a dial reading of 10, and presence of disengagement of the piston from the main body was checked.
- a vibration machine TUBE MIXER TRIO HM-2F manufactured by As One Corporation
- An extrusion nozzle was filled with CLEARFILTM PHOTO CORE (manufactured by Kuraray Medical Inc.) and irradiated with light for twenty seconds with JET-LITE 3000 (manufactured by Morita Corporation) to be cured, and thus the extrusion nozzle was closed off. Subsequently, the piston was fitted to the main body and laid for three minutes at 70 Torr, and the presence of disengagement of the piston from the main body was checked.
- CLEARFILTM PHOTO CORE manufactured by Kuraray Medical Inc.
- JET-LITE 3000 manufactured by Morita Corporation
- a piston was fitted to the main body and pushed in at a cross-head speed of 100 mm/min with AUTOGRAPH (AGS-G 500N manufactured by Shimazu Corporation), and a maximum load value measured before the front end wall portion 2 b of the piston comes into contact with the inner circumferential wall of the main body was measured as a force required for pushing in the piston.
- AUTOGRAPH AGS-G 500N manufactured by Shimazu Corporation
- the main body was filled with CLEARFIL PHOTO CORE and fitted with the piston and then irradiated from the direction of the piston with light for one minute with JET-LITE 3000, and presence of curing of the filler was checked.
- the present invention provides a cartridge-type dispenser suitable for extruding viscous materials that is capable of ensuring a smooth operation of extruding contents while preventing a piston from being easily disengaged from a main body.
Abstract
A cartridge-type dispenser has a cartridge main body with a filling space, an extrusion nozzle on the front, and a piston slidably disposed in the filling space. The piston extrudes contents of the filling space from the extrusion nozzle by applying a push-in force. The piston includes a trunk portion having an outer circumferential wall running along an inner wall of the main body with a gap therebetween, a front wall on one end of the trunk portion directly contacting the contents of the filling space, and a rear wall on the other end whereon a rod of a push-in tool applies the push-in force on the piston. On the outer circumferential wall of the trunk portion, protrusions are provided, which contact the inner circumferential wall of the main body. The points of contact form sliding parts of the piston but do not seal the main body interior.
Description
- The present invention relates to a cartridge-type dispenser suitable for extruding viscous materials such as composite resin used for dental treatment or the like, wherein a contents-extruding piston does not fall easily out of a dispenser main body and yet is capable of extruding the contents with a smooth action.
- Paste materials with high viscosity, such as composite resin and adhesive agent, are often used in dental treatment or the like and generally extruded from a syringe-type dispenser or a cartridge-type dispenser. In the syringe-type dispenser, contents are extruded from a nozzle by applying a push-in force to a plunger fitted in a syringe main body to slide the plunger in the syringe main body. On the other hand, in the cartridge-type dispenser wherein a piston is arranged in a cartridge main body (referred to below simply as a “main body”), the contents are extruded by fitting the main body to a separately prepared push-in tool (trigger-type push-in tool) and pushing in the piston. (Refer, e.g., to Patent Document 1 identified below.)
- In particular, in the cartridge-type dispenser, the contents filled in the main body are disposed once used in a single treatment, and from perspectives of quality assurance and hygiene, a dispenser of this type is frequently used in recent years. However, since there is a variation and the like in molding accuracy of the piston and the main body which constitute the dispenser, in case where a diameter size of the piston is small, the piston can be easily disengaged from the main body. On the other hand, in case where the diameter size of the piston is large, although this case has an advantage of improved airtightness, the piston can be disengaged from the main body due to an increase in an inner pressure when the piston is installed after the contents have been filled in, and as a result, assembly becomes laborious, and moreover, an operation of extruding the contents can be slowed down, which sometimes causes malfunction in which the contents cannot be smoothly extruded.
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- Patent Document 1: JP 2001-057987A
- It is an objective of the present invention to provide a cartridge-type dispenser suitable for extruding viscous materials, wherein a piston does not easily fall out and yet is capable of extruding contents with a smooth action.
- The present invention provides a cartridge-type dispenser comprising: a cartridge main body defining a filling space for contents and provided with an extrusion nozzle at a front end portion of the cartridge main body; and a piston slidably arranged in the filling space of the cartridge main body and configured to cause the contents of the filling space to be extruded from an end of the extrusion nozzle in response to application of a push-in force. The piston includes: a trunk portion having an outer circumferential wall arranged opposite to an inner circumferential wall of the cartridge main body so as to define a gap therebetween; a front end wall portion provided at one end portion of the trunk portion in direct contact with the contents of the filling space; and a rear end wall portion provided at another end portion of the trunk portion to be pressed with a rod of a push-in tool for the application of the push-in force to the piston itself. The outer circumferential wall of the trunk portion is provided with a protrusion, which is in contact with the inner circumferential wall of the cartridge main body to form a sliding part of the piston without sealing off an interior of the cartridge main body.
- Provision of a protrusion on the trunk portion of the piston, as a sliding part of the piston, makes it possible to reduce the contact area between the piston and the inner circumferential wall of the main body. Accordingly, even when the piston is firmly fitted to the main body at the sliding part to prevent the piston from being easily disengaged from the main body, the piston is able to slide smoothly, thereby improving operability. Furthermore, a tiny gap is formed between the piston and the main body in a part of the piston other than the sliding part. As a result, when the piston is assembled after the contents are filled in, air remaining in the main body is discharged to the outside through the gap, and the inner pressure is not increased.
- With an hourglass shape of the trunk portion of the piston having the reduced diameter at the middle portion in the push-in direction of the piston, it is possible to further reduce the contact area between the piston and the inner circumferential wall of the main body.
- Furthermore, when the sizes of the one end portion and the other end portion of the trunk portion of the piston are D1 and D2 (where D1 is closer to a front end portion, and D2 is closer to a rear end portion), and the size of the interior of the main body is X, it is preferable that a difference between the sizes D1, D2 and X, i.e. the gap formed between the main body and the trunk portion of the piston, satisfies the conditions X−D1≦1 mm and X−D2≦1 mm, because in this case the contents are in a good state of preservation for a longer period of time. Here, from the perspective of securing the gap, it is preferable that 0.01 mm≦X−D1≦1 mm and 0.01 mm≦X−D2≦1 mm. It is further preferable that 0.02 mm≦X−D1≦0.5 mm and 0.02 mm≦X−D2≦0.5 mm. It is most preferable that 0.04 mm≦X−D1≦0.2 mm and 0.04 mm≦X−D2≦0.2 mm.
- Moreover, when the sizes of the one end portion and the other end portion of the trunk portion of the piston, inclusive of the protrusion, are D3 and D4 (where D3 is closer to the front end portion, and D4 is closer to the rear end portion), it is preferable that a difference between the sizes D3, D4 and X, i.e. the size when the protrusion is fitted to the main body, satisfies D3−X≧0.01 mm and D4−X≧0.01 mm, because in this case the piston is further prevented from disengagement. Here, from the perspective of achieving a smooth sliding movement, it is preferable that 0.5 mm≧D3−X≧0.01 mm and 0.5 mm≧D4−X≧0.01 mm. It is further preferable that 0.3 mm≧D3−X≧0.05 mm and 0.3 mm≧D4−X≧0.05 mm. It is most preferable that 0.26 mm≧D3−X≧0.10 mm and 0.26 mm≧D4−X≧0.10 mm. On the other hand, when a total length of the piston in the push-in direction is D5, the length D5 needs to be determined as appropriate, because an appropriate length of D5 depends on a length of the interior of the main body in the push-in direction, as well as a stroke of the push-in tool.
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FIG. 1A shows a general embodiment of a dispenser according to the present invention in a cross sectional lateral view, andFIG. 1B shows the general embodiment of the dispenser according to the present invention when the dispenser shown inFIG. 1A is viewed from a rear end wall thereof. -
FIG. 2 is a perspective appearance view of a piston arranged in the dispenser shown inFIGS. 1A and 1B , with three protrusions provided on a cylindrical trunk portion thereof. -
FIG. 3 shows another example of the piston favorably applicable to the present invention in which middle sections of the protrusions provided in the piston are removed to divide the ribs into upper and lower end sections so as to further reduce the contact area between the piston and the main body. -
FIG. 4 shows another example of the piston favorably applicable to the present invention in which the protrusions are provided in a portion of the piston other than the end portions thereof with respect toFIG. 3 . -
FIG. 5 shows another example of the piston favorably applicable to the present invention in which a single protrusion is helically formed. -
FIG. 6 shows another example of the piston favorably applicable to the present invention in which the trunk portion of the piston is depressed so that the piston does not make contact with the main body even when the piston itself is deformed. -
FIG. 7 shows another example of the piston favorably applicable to the present invention in which the protrusions provided in the upper and lower end portions of the piston shown inFIG. 6 are joined. - The present invention will be described below in further detail, with reference to the accompanying drawings.
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FIGS. 1A and 1B show a general structure of a dispenser according to the present invention in a cross sectional view, andFIG. 2 is a perspective appearance view of a piston arranged in the dispenser shown inFIG. 1A andFIG. 1B . - Reference numeral 1 in the drawings denotes a main body defining a filling space M for contents. The main body 1 can be made of high-density polyethylene (HDPE), low-density polyethylene (LDPE), polypropylene (PP), acryl, polyethylene terephthalate (PET), polyoxy-methylene (POM), polybutylene terephthalate (PBT), and the like. The main body 1 includes at a front end portion thereof an integrally formed
extrusion nozzle 1 a and also includes around an outer circumferential wall of a rear end opening 1 b thereof aflange 1 c for linkage to a separately prepared push-in tool (not shown). The main body 1 is preferably made of PBT, in particular. -
Reference numeral 2 denotes the piston arranged in the main body 1. Thepiston 2 has atrunk portion 2 a having an outer circumferential wall arranged opposite to an inner circumferential wall of the main body 1 so as to define a gap therebetween, a frontend wall portion 2 b provided at one end portion of thetrunk portion 2 a in direct contact with the contents of the filling space M, and a rearend wall portion 2 c provided at another end portion of thetrunk portion 2 a to be pressed with a rod (not shown) of a push-in tool for application of a push-in force to thepiston 2 itself. As thetrunk portion 2 a of thepiston 2, a cylinder having sizes (diameters) D1 and D2 at the one end portion and the other end portion (where D1 is closer to the frontend wall portion 2 b, and D2 is closer to the rearend wall portion 2 c) and a size D in the middle portion of thetrunk portion 2 a in a push-in direction is used, where D1, D2, and D are equal. -
Reference numeral 3 denotes longitudinal ribbed protrusions integrally formed on thetrunk portion 2 a of thepiston 2. Theprotrusions 3 are provided at three positions on the outer circumferential wall at regular intervals such that an end of eachprotrusion 3 contacts the inner circumferential wall of the main body 1 for sliding in the main body 1 in conjunction with a movement of thepiston 2. Furthermore, sizes D3 and D4 of thepiston 2 at the one end portion and the other end portion (where D3 is closer to the frontend wall portion 2 b, and D4 is closer to the rearend wall portion 2 c), inclusive of theprotrusions 3, are larger than an inner diameter X of the main body 1. The material for thepiston 2 may comprise elastomer, rubber, LDPE (such as linear low density polyethylene (LLDPE)), HDPE, PP, acryl, and the like. Among others, LDPE is preferably used. -
Reference numeral 4 denotes a nozzle cap mounted on theextrusion nozzle 1 a to close off an extrusion orifice of theextrusion nozzle 1 a. In the embodiments illustrated in the drawings thenozzle cap 4 is linked by engagement means, such as undercuts. Alternatively, however, thenozzle cap 4 may be screwed by a thread. A fitting effect provided by the above engagement means or screw structure allows positioning of the cap, to thereby facilitate the assembling and prevent disengagement of the cap when the cap is loosely mounted and also prevent damage to the cap when the cap is tightly or deeply mounted. - In case where the
nozzle cap 4 is provided with the fitting effect, it is preferable to employ a hardlydeformable nozzle cap 4. The reason is that, although an easilydeformable nozzle cap 4 has an advantage that it can be mounted even when the size is not precisely set, such an easily deformable cap tends to be disengaged or to be damaged. In order to restrict deformation of thenozzle cap 4 and provide thenozzle cap 4 with the fitting effect with theextrusion nozzle 1 a, HDPE, LDPE, PP, acryl, and the like can be used as the material of thenozzle cap 4, and in particular, HDPE is preferably used. - An outer diameter of the
extrusion nozzle 1 a is preferably as small as possible in the dental treatment, and therefore the inner diameter D6 is necessarily small. As for the inner diameter D6 of theextrusion nozzle 1 a, it is preferable that 0.01≦D6/X≦0.60, and it is further preferable that 0.25≦D6/X≦0.55. - In the dispenser with the above structure, when the
piston 2 is fitted to the main body 1, a contact part between thepiston 2 and the main body 1 is formed only by theprotrusions 3. Accordingly, thepiston 2 is able to slide smoothly even in a fitting state (i.e. the state in which thepiston 2 cannot undergo disengagement) where theprotrusions 3 are in a tight contact with the inner circumferential wall of the main body 1. - A tiny gap P is formed between the
piston 2 and the main body 1 in a region where theprotrusions 3 are not provided (refer toFIG. 1A ). When thepiston 2 is gradually pushed in to be fitted to the main body 1 after the contents have been filled in, air remaining in the main body 1 is discharged through the gap into the outside, and an inner pressure is not increased. As a result, thepiston 2 is prevented from being disengaged from the main body 1 due to an increase in the inner pressure. -
FIGS. 3 to 7 show different embodiments of the piston favorably applicable to the cartridge-type dispenser according to the present invention. -
FIG. 3 shows thepiston 2 in which theprotrusions 3 are provided at the end portions of thetrunk portion 2 a of thepiston 2 while a shape of thetrunk portion 2 a remains cylindrical. In this case, contact of thepiston 2 with the main body 1 is made at theprotrusions 3 provided at a front end portion and a rear end portion of thepiston 2. Accordingly, a contact area is further reduced, and operability is further improved. -
FIG. 4 shows thepiston 2 in which theprotrusions 3 are provided in a portion of thetrunk portion 2 a other than the end portions thereof while the shape of thetrunk portion 2 a remains cylindrical. In this case, as inFIG. 3 , the contact area is further reduced, and operability is further improved. -
FIG. 5 shows thepiston 2 in which thesingle protrusion 3 is helically formed while the shape of thetrunk portion 2 a remains cylindrical, which shows an example of the smallest number of the protrusion still satisfying demand characteristics of the present invention. -
FIGS. 6 and 7 show thepistons 2 in each of which the size (diameter) D in the middle portion of thetrunk portion 2 a in a longitudinal direction thereof is minimized with respect to the sizes (diameters) DI, D2 (D1=D2) at the end portions of thetrunk portion 2 a, so that thetrunk portion 2 a has an hourglass-shaped cross section tapering from the end portions toward the middle portion in the longitudinal direction. - In each of the
pistons 2 shown inFIGS. 6 and 7 with the hourglass-shapedtrunk portion 2, as inFIG. 3 , the contact of thepiston 2 with the main body 1 is made at theprotrusions 3 provided at the front end portion and the rear end portion of thepiston 2. Accordingly, the contact area is further reduced, and operability is further improved. - The
protrusions 3 may be provided only at the end portions of thetrunk portion 2 a, over an entire length of thetrunk portion 2 a, or even alternately provided at the front end portion and the rear end portion of thetrunk portion 2 a of thepiston 2. Particularly, when theprotrusions 3 are provided alternately at the front end portion and the rear end portion of thetrunk portion 2 a of thepiston 2, intrusion of light through the gaps is better prevented, and therefore quality of the contents is maintained in a more stable manner. - In addition, although the drawings show the examples of one, three, and six
protrusions 3 provided along a circumference of thetrunk portion 2 a, the number of the protrusions is not specifically limited. - The following describes examples of the present invention. However, the present invention is not limited to the examples described below.
- As the cartridge-type dispensers, the bodies made of PBT and the pistons made of the materials described below were prepared, and a vibration test, a depressurization test, a loading test, and a curing test were conducted to evaluate performance of each dispenser.
- Vibration Test
- The main body fitted with a piston was laid on a pan secured to a vibration machine (TUBE MIXER TRIO HM-2F manufactured by As One Corporation) and vibrated for one minute at a dial reading of 10, and presence of disengagement of the piston from the main body was checked.
- Depressurization Test
- An extrusion nozzle was filled with CLEARFIL™ PHOTO CORE (manufactured by Kuraray Medical Inc.) and irradiated with light for twenty seconds with JET-LITE 3000 (manufactured by Morita Corporation) to be cured, and thus the extrusion nozzle was closed off. Subsequently, the piston was fitted to the main body and laid for three minutes at 70 Torr, and the presence of disengagement of the piston from the main body was checked.
- Loading Test
- A piston was fitted to the main body and pushed in at a cross-head speed of 100 mm/min with AUTOGRAPH (AGS-G 500N manufactured by Shimazu Corporation), and a maximum load value measured before the front
end wall portion 2 b of the piston comes into contact with the inner circumferential wall of the main body was measured as a force required for pushing in the piston. - Curing Test
- The main body was filled with CLEARFIL PHOTO CORE and fitted with the piston and then irradiated from the direction of the piston with light for one minute with JET-LITE 3000, and presence of curing of the filler was checked.
- The main body with X=4.42 mm, and the piston made of acryl and having a shape as shown in
FIG. 3 with D1 (=D2)=4.30 mm, D3 (=D4)=4.60 mm, and D5=6.80 mm were molded. Table 1 shows the results of evaluation. - The main body with X=4.42 mm, and the piston made of LDPE and having a shape as shown in
FIG. 7 with D1 (=D2)=4.30 mm, D3 (=D4)=4.60 mm, and D5=6.80 mm were molded. Table 1 shows the results of evaluation. - The main body with X=4.42 mm, and the piston made of LDPE without the protrusion and with D1 (=D2)=4.30 mm and D5=6.80 mm were molded. Table 1 shows the results of evaluation.
- The main body with X=4.42 mm, and the piston made of LDPE without the protrusion and with D1 (=D2)=4.54 mm and D5 3.40 mm were molded. Table 1 shows the results of evaluation.
-
TABLE 1 Inventive Comparative Examples Examples 1 2 1 2 Material of main body PBT Inner diameter size (X) of main 4.42 body (mm) Material of piston Acryl LDPE Shape of piston FIG. 3 FIG. 7 Without protrusion Diameter (D1) of trunk portion 4.30 4.30 4.30 4.54 of piston (mm) Diameter (D3) of trunk portion 4.60 4.60 N/A N/A of piston, inclusive of protrusion (mm) X − D1 (mm) 0.12 0.12 0.12 −0.12 D3 − X (mm) 0.18 0.18 N/A N/A Piston total length (D5) 6.80 6.80 6.80 3.40 in push-in direction (mm) Vibration test No No Yes No (piston disengagement from main body) Depressurization test No No No Yes (piston disengagement from main body) Loading test (N) 16 14 0 106 Curing test No No No No (occurrence of curing of filler) - It will be appreciated from Table 1 that, in the cartridge-type dispenser in which the piston is not provided with the protrusion on an outer surface thereof and the piston has a diameter smaller than the inner diameter of the main body, the piston easily underwent disengagement in response to the vibration. Furthermore, in the cartridge-type dispenser in which the piston is not provided with the protrusion on the outer surface thereof and the piston has a diameter larger than the inner diameter of the main body, although the piston was not disengaged in response to the vibration, the piston inevitably underwent disengagement when the inner pressure increased, and moreover, the load measured at the time of pushing in the piston was remarkably large. On the other hand, in the cartridge-type dispenser according to the present invention, the piston did not undergo disengagement even when the vibration was applied and when the inner pressure was increased, and the load measured at the time of pushing in the piston was confirmed to be small.
- The present invention provides a cartridge-type dispenser suitable for extruding viscous materials that is capable of ensuring a smooth operation of extruding contents while preventing a piston from being easily disengaged from a main body.
-
-
- 1 Main body
- 1 a Extrusion nozzle
- 1 b Rear end opening
- 1 c Flange
- 2 Piston
- 2 a Trunk portion
- 2 b Front end wall portion
- 2 c Rear end wall portion
- 3 Protrusion
- 4 Nozzle cap
- M Filling space
- P Gap formed by piston and main body
Claims (5)
1. A cartridge-type dispenser comprising: a cartridge main body defining a filling space for contents and provided with an extrusion nozzle at a front end portion of the cartridge main body; and a piston slidably arranged in the filling space of the cartridge main body and configured to cause the contents of the filling space to be extruded from an end of the extrusion nozzle in response to application of a push-in force, wherein:
the piston includes (i) a trunk portion having an outer circumferential wall arranged opposite to an inner circumferential wall of the cartridge main body so as to define a gap therebetween, (ii) a front end wall portion provided at one end portion of the trunk portion in direct contact with the contents of the filling space, and (iii) a rear end wall portion provided at another end portion of the trunk portion to be pressed with a rod of a push-in tool for application of the push-in force to the piston; and
the outer circumferential wall of the trunk portion is provided with a protrusion, which is in contact with the inner circumferential wall of the cartridge main body to form a sliding part of the piston without sealing off an interior of the cartridge main body.
2. The cartridge-type dispenser of claim 1 , wherein the trunk portion of the piston has an hourglass shape having a reduced diameter at a middle portion thereof in a push-in direction of the piston.
3. The cartridge-type dispenser of claim 1 , which satisfies the following conditions:
X−D 1≦1 mm; and
X−D 2≦1 mm
X−D 1≦1 mm; and
X−D 2≦1 mm
wherein D1 and D2 represent, respectively, dimensions at one end portion and the other end portion of the trunk portion of the piston, and X represents an inner dimension of the cartridge main body.
4. The cartridge-type dispenser of claim 1 , which satisfies the following conditions:
D 3 −X≧0.01 mm; and
D 4 −X≧0.01 mm
D 3 −X≧0.01 mm; and
D 4 −X≧0.01 mm
wherein D3 and D4 represent, respectively, dimensions at one end portion and the other end portion of the trunk portion of the piston, inclusive of the protrusion, and X represents an inner dimension of the cartridge main body.
5. The cartridge-type dispenser of claim 1 , which satisfies the following conditions:
X−D 1≦1 mm;
X−D 2≦1 mm;
D 3 −X≧0.01 mm; and
D 4 −X≧0.01 mm, wherein
X−D 1≦1 mm;
X−D 2≦1 mm;
D 3 −X≧0.01 mm; and
D 4 −X≧0.01 mm, wherein
D1 and D2 represent, respectively, dimensions at one end portion and the other end portion of the trunk portion of the piston;
D3 and D4 represent, respectively, dimensions at one end portion and the other end portion of the trunk portion of the piston, inclusive of the protrusion; and
X represents an inner dimension of the cartridge main body.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-122721 | 2010-05-28 | ||
JP2010122721 | 2010-05-28 | ||
PCT/JP2011/002342 WO2011148564A1 (en) | 2010-05-28 | 2011-04-21 | Cartridge-type dispenser |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130134188A1 true US20130134188A1 (en) | 2013-05-30 |
Family
ID=45003565
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/700,614 Abandoned US20130134188A1 (en) | 2010-05-28 | 2011-04-21 | Cartridge-type dispenser |
Country Status (8)
Country | Link |
---|---|
US (1) | US20130134188A1 (en) |
EP (1) | EP2578181B1 (en) |
JP (1) | JPWO2011148564A1 (en) |
KR (1) | KR101356559B1 (en) |
CN (1) | CN103079493B (en) |
AU (1) | AU2011259691B2 (en) |
CA (1) | CA2800515C (en) |
WO (1) | WO2011148564A1 (en) |
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US20130334257A1 (en) * | 2010-08-08 | 2013-12-19 | Anton Brugger | Metering dispenser |
US20140263403A1 (en) * | 2013-03-15 | 2014-09-18 | Nordson Corporation | Liquid Dispensing Syringe |
US20150093715A1 (en) * | 2013-09-30 | 2015-04-02 | Shofu Inc. | Viscous material container with expandable bend |
US20150090742A1 (en) * | 2013-09-30 | 2015-04-02 | Shofu Inc. | Viscous material container having annularly contacting piston |
US20160074136A1 (en) * | 2013-04-30 | 2016-03-17 | 3M Innovative Properties Company | Pen-like dispenser for a dental material |
US10266314B2 (en) * | 2016-12-26 | 2019-04-23 | Philip D. Haglof | Construction material tube strap cap |
US11129940B2 (en) * | 2014-08-06 | 2021-09-28 | Xeris Pharmaceuticals, Inc. | Syringes, kits, and methods for intracutaneous and/or subcutaneous injection of pastes |
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JP6560042B2 (en) | 2015-07-14 | 2019-08-14 | 株式会社松風 | Piston that can be easily mounted on a cartridge and its insertion method |
KR102004249B1 (en) | 2017-11-29 | 2019-07-26 | 주식회사 휴덴스 | LIQUID SYRINGE of FILLING MACHINE FOR REMOVING AND PREVENTING AIR BUBBLE |
US10391517B1 (en) * | 2018-05-30 | 2019-08-27 | Sulzer Mixpac Ag | Dispenser assembly |
CN116181111B (en) * | 2023-04-26 | 2023-07-04 | 山西建筑工程集团有限公司 | Foaming glue spraying device for building hole plugging |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130334257A1 (en) * | 2010-08-08 | 2013-12-19 | Anton Brugger | Metering dispenser |
US20140263403A1 (en) * | 2013-03-15 | 2014-09-18 | Nordson Corporation | Liquid Dispensing Syringe |
US20160074136A1 (en) * | 2013-04-30 | 2016-03-17 | 3M Innovative Properties Company | Pen-like dispenser for a dental material |
US10016257B2 (en) * | 2013-04-30 | 2018-07-10 | 3M Innovative Properties Company | Pen-like dispenser for a dental material |
US20150093715A1 (en) * | 2013-09-30 | 2015-04-02 | Shofu Inc. | Viscous material container with expandable bend |
US20150090742A1 (en) * | 2013-09-30 | 2015-04-02 | Shofu Inc. | Viscous material container having annularly contacting piston |
CN104510542A (en) * | 2013-09-30 | 2015-04-15 | 株式会社松风 | Viscous material container with expandable bend |
US9345555B2 (en) * | 2013-09-30 | 2016-05-24 | Shofu Inc. | Viscous material container with expandable bend |
US9393082B2 (en) * | 2013-09-30 | 2016-07-19 | Shofu, Inc. | Viscous material container having annularly contacting piston |
US11129940B2 (en) * | 2014-08-06 | 2021-09-28 | Xeris Pharmaceuticals, Inc. | Syringes, kits, and methods for intracutaneous and/or subcutaneous injection of pastes |
US10266314B2 (en) * | 2016-12-26 | 2019-04-23 | Philip D. Haglof | Construction material tube strap cap |
Also Published As
Publication number | Publication date |
---|---|
CA2800515A1 (en) | 2011-12-01 |
EP2578181A1 (en) | 2013-04-10 |
JPWO2011148564A1 (en) | 2013-07-25 |
CN103079493A (en) | 2013-05-01 |
AU2011259691A1 (en) | 2012-12-20 |
WO2011148564A1 (en) | 2011-12-01 |
CN103079493B (en) | 2016-08-03 |
KR101356559B1 (en) | 2014-01-28 |
EP2578181A4 (en) | 2013-11-27 |
KR20130025905A (en) | 2013-03-12 |
EP2578181B1 (en) | 2016-08-10 |
AU2011259691B2 (en) | 2014-02-20 |
CA2800515C (en) | 2014-12-23 |
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