US3075675A - Piston arrangement for dispensing partially compressible plastic materials - Google Patents
Piston arrangement for dispensing partially compressible plastic materials Download PDFInfo
- Publication number
- US3075675A US3075675A US699792A US69979257A US3075675A US 3075675 A US3075675 A US 3075675A US 699792 A US699792 A US 699792A US 69979257 A US69979257 A US 69979257A US 3075675 A US3075675 A US 3075675A
- Authority
- US
- United States
- Prior art keywords
- piston
- skirt
- head
- tube
- flange
- 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.)
- 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
- B05C17/00576—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
- B05C17/00579—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 comprising means for allowing entrapped air to escape to the atmosphere
-
- 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
Definitions
- the invention is particularly applicable to the dispensing of caulking materials from caulking guns, and will be described with particular reference thereto although it will be appreciated that the invention has broader applications.
- Caulking material is ordinarily sold in an elongated, cylindrical tube having a nozzle at one end and a piston in the other end.
- a plunger forces this piston through the tube to force the caulking material out of the nozzle.
- the nozzle end is usually held against cracks or the like to be filled, and considerable hydraulic pressures are developed within the caulking material in the tube.
- the nozzle is removed from the crack and the plunger is withdrawn from its engagement with the piston.
- Caulking material usually has various amounts of air entrained therein during the mixing operation. This air is compressed during a dispensing operation. Immediately upon the release of the pressure on the material, this air commences to expand, the rate of expansion being restricted by the high viscosity of the caulking material. This expansion, however, causes the caulking material to ooze out of the nozzle for considerable periods of time after the end of each caulking operation. This oozing is not only messy and annoying to the operator, but is wasteful of caulking material.
- the head of the piston was formed from a thin sheet or film of flexible pliant material assembled with an outer metal ring so as to have a slack formed therein which slack would take up the expansion of the air in the caulking material.
- Such pistons While extensively used, have not been entirely satisfactory.
- the thin sheet of material requires a complicated assembly operation with the other parts of the piston. It is difiicult to obtain uniform degrees of slack in the material, and it is almost impossible to obtain a sufficient volume of slack to take up all of the air expansion of a full tube of caulking material. Thus, the problems of oozing still continued.
- the present invention contemplates a piston arrangement for dispensing caulking materials and the like which overcomes all of the above-referred to difficulties, and others, and provides a piston arrangement which is simple in construction, inexpensive to manufacture, and effective in operation.
- a piston having a head of thin resilient, flexible material having in the normal unflexed condition a concave surface facing the material to be dispensed which head is adapted to be collapsed into engagement with the material by externally exerted pressures and will then be biased to spring back to its original shape upon the re lease of such pressures.
- the amount of volume provided by the concavity will be in excess of the maximum air content of the material being dispensed.
- the piston is provided with one or a plurality of passages therethrough, each having a dimension such as to freely pass air therethrough, but either none or insignificant amounts of the material being dispensed. If a plurality of openings are provided, they should be Widely spaced one from the other. Furthermore, such openings may be so located in the piston that as the head is collapsed, these openings will be at least in part closed.
- the piston is comprised of a head formed of a molded polyethylene material, or the equivalent, and a skirt of metal having an outer cylindrical portion adapted to engage the inner walls of the tube, and an inner axially extending portion defining an opening into which portions of the head extend and interlock therewith.
- the principal object of the invention is the provision of a new and improved piston for the dispensing of partially compressible plastic materials which will prevent the oozing of such materials at the completion of a dispensing operation.
- Another object of the invention is the provision of a new and improved piston having a flexible resilient head which is collapsed in the course of dispensing the plastic material and is biased to return to its original shape upon the release of the dispensing pressure to provide a space into which the material may expand.
- Another object of the invention is the provision of a new and improved piston of the general type described having a head which is collapsible under dispensing pressures, and is biased to return to its original shape, and which has passages therethrough to permit the escape and return of air to the space under the piston.
- Another object of the invention is the provision of a new and improved piston of the general type described comprised of a molded plastic head and a metallic skirt which are readily and economically assembled, and which may be then handled as a unit without danger of their becoming separated.
- FIGURE 1 is a side cross-sectional view partly schematic of a caulking gun arrangement illustrating a preferred embodiment of the invention
- FIGURE 2 is a cross sectional view of FIGURE 1 taken approximately on the line 2--2 thereof, and
- FIGURE 3 is a fragmentary view of FIGURE 1 showing the head of the piston in the collapsed or material dispensing position.
- FIGURE 1 shows fragmentary portions of an elongated tube ltr filled with a plastic material 11 to be dispensed, and having at one end a tapered nozzle 12 through which the material 11 is to be dispensed, and at the other end, a piston arrangement constructed in accordance with the invention.
- a plunger 14 is axially movable along the length of the tube 10 to advance the piston axially therethrough and force the material 11 out of the nozzle 12.
- the tube 10 may be of any desired material including paper, plastic, or metal; preferably it is formed of thin sheet metal either seamless or having a formed longitudinally extending seam.
- the nozzle 12 may in a like manner be formed of any known or desired material. In preferred embodiments, it is formed of a molded semi-pliant plastic material I 3 and may be fixed to the end of the tube in any desired manner.
- the plunger 14 is comprised generally of a plunger rod 16 having a flat head 17 of an outer diameter slightly less than the inner diameter of the tube 10 which is adapted to engage the piston, as will be described, and force it through the tube 10.
- the material to be dispensed 11 may also be as desired, but is normally a caulking material which, as known, generally has entrained therein approximately 8% by volume of air or other gaseous medium.
- the word air will be used hereinafter generically to to indicate any gaseons-medium entrained in the material '11.
- the piston arrangement of the preferred embodiment includes a head portion 20 which extends generally transversely across the'diameter of the-tube 10, and a skirt portion 21'which extends generally axially of the tube 10 and is in sealing engagement with the inner walls thereof.
- the skirt portion 21 may be formed of any known rigid material, but in the preferred embodiment is stamped and drawn from a sheet of thin metallic material so as to have a skirt portion proper 22, a radially inward extending flange 23, and an axially extending flange 2 4 which flange 24 defines an axial opening in the skirt portion 21 which is covered over by the head portion 20.
- the skirt portion proper 22 terminates at its right end, as viewed in FIGURE 1, in a slight outwardly turning feather edge 26 which upon initial assembly of the piston with the tube 10 bears against the right hand end 27 of the tube 10 to assist in holding the piston in assembled relationship with the tube.
- the opposite or left hand end of the skirt proper 22 has a slight radially inward offset 28 which facilitates the assembly of the piston in the right end of the tube 10.
- the head portion 20 is the important part of the pres-v ent invention, and includes a dome-shaped portion 38 with the concave surface thereof facing the material 11.
- This dome-shape terminates in generally an axially extending flange 31 having an outer diameter such as to fit with in the opening defined by the axial flange 24.
- the outer surface of the portion 3 1 has a radially outwardly extending flange 33 which bears against the radial flange 23 of the skirt portion 21 and also has a short radially outwardly extending surface 35 spaced from the flange 33 a distance in relation to the axial length of the portion 24 as to engage the end of such portion and retain the head portion 20 in assembled relationship with the skirt portion 21.
- the axial end of the portion 31 is beveled inwardly to facilitate and assist in the assembly of these two portions.
- the flange 24 has a slight inward taper to assist in this assembly operation.
- the head portion 20 is, in accordance with the invention, formed of a flexible, resilient material and by flexible' resilient is meant a material which can be readily flexed by a force in one direction but will have suflicient resiliency to restore itself to its original shape upon the removal of the deforming force.
- the material is one which has a sufliciently high yield point on a modulus of elasticity curve that for the flexing which will occur in normal operation, the yield point of the material is never reached.
- the invention may be distinguished from the use of thin film-like materials which if once deformed will substantially remain in such deformed condition for long periods of time.
- a molded polyethylene plastic material is preferred and wall thicknesses of .024 and .018 inch for the portions 30 and 31 respectively have worked very satisfactorily in practice.
- Such passages may take a number of different forms, but in the preferred embodiment are comprised of one or a plurality of openings 45 in the domed portion 30. These openings 45 extend axially and are preferably located adjacent the edge of the dome portion 30, and more particularly close to the line of intersection of the curvature of the dome 30 and the axial flange 31.
- openings 45 Any number of openings 45 may be employed, but three, as shown in FIGURE 2, spaced from each other, have been found to be adequate.
- the purpose of so spacing the openings is to prevent the closure of all of such openings in the event that the tube 10 full of caulking material 11 is stored on its side for any period of time such that the caulking material would flow from its normal fill line, indicated at 40, to a fill line indicated by the dashed lines 41. In such event, if only one opening were provided, there would be a possibility that the caulking material would plug up the opening 45 below the fill line 41. With the arrangement shown, however, this is prevented.
- the openings 45 should have a diameter such that air can freely pass therethrough, but such that the caulking material cannot, at least in any appreciable amounts. Without limiting the invention, a diameter of .025 inch has been fiound to be entirely adequate and satisfactory.
- the tube 10 is generally filled with caulking material 11 to the fill line 40. Some means not shown are normally provided to prevent the exodus of the caulking material through the nozzle 12 prior to the first use.
- the head and skirt portions may be assembled prior to assembly with the tube 10, or the skirt portion 21 may be assembled with the tube 19 and then the head portion 20 assembled therewith. In either event, the tapered surface 36 and the shoulder 35 act to hold the head and skirt portions in the assembled relationship shown.
- the plunger 14 is advanced axially into engagement with the outer or right hand surface of the head portion 20.
- the first action is that the domed portion 30 collapses and air moves outwardly through the Openings 45.
- the openings 45 are in whole or part closed substantially, as is shown.
- the piston moves axially down the tube 10 into engagement with the fill line 41
- the caulking material 11 with its entrained air is placed under compression with a sufficient force to force the material out of the nozzle 12.
- the plunger 14 is pulled back from its engagement with the head 20.
- the dome portion 30 because of its inherent resiliency, springs back to the shape shown in FIGURE 1, the holes 45 acting to allow air to enter the space thus formed. Thereafter the compressed entrained air in the caulking material 11 can gradually expand the thick viscous caulking material into the space formed by the return of the domed portion 30 to its original shape.
- the. caulking material normally has about 8% entrained air, and the total expansion of the caulking material which must be provided for is about 5% of the volume of caulking material remaining in the tube 10.
- the dome portion 30 in the preferred embodiment has a total change of volume approximately 10% greater than the maximum possible volume change of the caulking material 11.
- the flexible portion and the rigid skirt portion may be assembled without the need for special assembly jigs or special assembly techniques.
- the entire piston, including the skirt portion may be made of a molded polyethylene material.
- a very substantial volume in weight of polyethylene material would be required. As such material is quite expensive, it has been determined that the described preferred embodiment is the cheaper to manufacture.
- a piston for dispensing partially compressible plastic material from an elongated hollow tube said piston comprising a rigid skirt having an annular outer skirt portion shaped and dimensioned to slidingly and sealingly engage the inside of said tube and having an inner axially extending flange connected integrally with said outer skirt portion and disposed radially inward therefrom and defining an axially extending opening, and a head formed of thin, flexible, resilient material extending transversely across said skirt, said head having an axially projecting annular mounting portion which is received in said axially extending opening in said flange, said mounting portion of the head at its free end having a radially outwardly projecting portion which projects radially outward across one end of said flan e in engagement therewith and being deformable radially inwardly to pass slidably through said opening toward said one end of the flange when the head is being assembled on the skirt, said head presenting a radially outwardly projecting flange which engages said skirt at the opposite end of said skirt
- a piston for dispensing partially compressible plastic material from an elongated hollow tube said piston comprising a rigid metal skirt having an annular, axially extending, outer skirt portion shaped and dimensioned to slidingly and sealingly engage the inside of said tube, said skirt at the forward end of said outer skirt portion having a radially inwardly extending flange connected integrally to said outer skirt portion, and a forwardly projecting, axially extending flange connected integrally to the radially inward end of said radially inwardly extending flange and defining an axially extending opening, and a head formed of thin, flexible, resilient material mounted on said skirt and extending transversely thereacross, said head having a forwardly projecting annular mounting portion which has an outer diameter substantially equal to the inner diameter of said axially extending flange on the skirt and which is received in said axially extending opening, said mounting portion of the head at its forward end tapering rearwardiy and outwardly and defining a radially outwardly
- An anti-ooze caulking assembly comprising a caulking gun provided with an axially movable plunger and including means for incremently advancing said plunger; and a cylindrical cartridge containing caulk and provided with a dispensing spout on one end and with a piston in the other end, said cartridge being held by said gun for axial movement of said plunger into engagement with said piston to move the piston axially in said cartridge to displace under pressure caulk therein through said dispensing spout, said piston including an outer metallic part that is radially rigid and is formed with an axially extending skirt which has a wedge shaped leading end portion to facilitate insertion of said piston into said cartridge body and an adjoining cylindrical skirt portion tightly fitted in said cartridge body, said leading end portion having a radially inwardly extending flange portion forming a central aperture through said outer metallic part; and an inner molded plastic part closing such aperture to the passage of caulk therethrough, said inner part being formed with a central portion convexly bowed toward said plunge
- a dispenser for dispensing partially compressible plastic material including a hollow tube for holding the material and a plunger movable axially along the inside of the tube, a piston in the tube separate from the plunger and disposed between the plunger and the material to be dispensed, the piston having a relatively rigid peripheral portion slidable along the inside of said tube in sealing engagement therewith, said piston also having a relatively flexible portion radially within said relatively rigid pcripheral portion, said piston, including said relatively flexible portion of said piston, being in containing relationship with said material to be dispensed and being movable by said plunger in pushing relationship with said material to be dispensed upon engagement of said piston by said plunger when said plunger is forced toward said material to be dispensed, with said relatively flexible portion of said piston being movable by said plunger from a condition of relatively great concavity with respect to said material to be dispensed to a condition of lesser concavity with respect to said material to be dispensed during the initial portion of said
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US699792A US3075675A (en) | 1957-11-29 | 1957-11-29 | Piston arrangement for dispensing partially compressible plastic materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US699792A US3075675A (en) | 1957-11-29 | 1957-11-29 | Piston arrangement for dispensing partially compressible plastic materials |
Publications (1)
Publication Number | Publication Date |
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US3075675A true US3075675A (en) | 1963-01-29 |
Family
ID=24810929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US699792A Expired - Lifetime US3075675A (en) | 1957-11-29 | 1957-11-29 | Piston arrangement for dispensing partially compressible plastic materials |
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Country | Link |
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US (1) | US3075675A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3315847A (en) * | 1965-05-13 | 1967-04-25 | Pyles Ind Inc | Plunger |
DE1286947B (en) * | 1964-12-21 | 1969-01-09 | Gen Electric | Elastic cartridge piston |
US4056345A (en) * | 1974-09-19 | 1977-11-01 | Ampco Foods Inc. | Dough forming apparatus |
FR2411776A2 (en) * | 1977-12-16 | 1979-07-13 | Fischer Artur | DEVICE FOR INJECTING A HARDENABLE BINDER WITH SEVERAL CONSTITUENTS IN A DRILL HOLE IN A MASONRY |
US4402431A (en) * | 1980-09-22 | 1983-09-06 | Henkel Kommanditgesellschaft Auf Aktien | Dispenser container with compressible pump |
US4657161A (en) * | 1983-03-30 | 1987-04-14 | Yoshino Kogyosho Co., Ltd. | A Dispensing container for cream-like fluids |
EP0620047A1 (en) * | 1993-04-10 | 1994-10-19 | HILTI Aktiengesellschaft | Piston for extrusion system |
US6899254B1 (en) * | 2004-01-20 | 2005-05-31 | Plas-Pak Industries, Inc. | Venting seal for dispenser |
US11370597B2 (en) * | 2018-05-18 | 2022-06-28 | Silgan Dispensing Systems Le Treport | Piston for a reservoir of a dispenser of a fluid product without air intake |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1270835A (en) * | 1915-07-23 | 1918-07-02 | Max Jersemann | Fluid or semifluid dispensing device for table use. |
US1788223A (en) * | 1927-09-26 | 1931-01-06 | Lowell Specialty Company | Sprayer |
US2111582A (en) * | 1936-07-18 | 1938-03-22 | Maintenance Res Ltd | Cartridge for caulking guns |
US2221763A (en) * | 1937-07-10 | 1940-11-19 | Aro Equipment Corp | Pumping apparatus for grease and the like |
US2630248A (en) * | 1948-10-08 | 1953-03-03 | Dirkes Ind Inc | Pump for dispensing fluid substances from containers |
US2778541A (en) * | 1955-09-01 | 1957-01-22 | William A Sherbondy | Caulking gun |
US2786604A (en) * | 1954-12-21 | 1957-03-26 | Harold B Collins | Calking guns |
US2833451A (en) * | 1957-01-17 | 1958-05-06 | William A Sherbondy | Caulking gun and cartridge therefor |
-
1957
- 1957-11-29 US US699792A patent/US3075675A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1270835A (en) * | 1915-07-23 | 1918-07-02 | Max Jersemann | Fluid or semifluid dispensing device for table use. |
US1788223A (en) * | 1927-09-26 | 1931-01-06 | Lowell Specialty Company | Sprayer |
US2111582A (en) * | 1936-07-18 | 1938-03-22 | Maintenance Res Ltd | Cartridge for caulking guns |
US2221763A (en) * | 1937-07-10 | 1940-11-19 | Aro Equipment Corp | Pumping apparatus for grease and the like |
US2630248A (en) * | 1948-10-08 | 1953-03-03 | Dirkes Ind Inc | Pump for dispensing fluid substances from containers |
US2786604A (en) * | 1954-12-21 | 1957-03-26 | Harold B Collins | Calking guns |
US2778541A (en) * | 1955-09-01 | 1957-01-22 | William A Sherbondy | Caulking gun |
US2833451A (en) * | 1957-01-17 | 1958-05-06 | William A Sherbondy | Caulking gun and cartridge therefor |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1286947B (en) * | 1964-12-21 | 1969-01-09 | Gen Electric | Elastic cartridge piston |
US3315847A (en) * | 1965-05-13 | 1967-04-25 | Pyles Ind Inc | Plunger |
US4056345A (en) * | 1974-09-19 | 1977-11-01 | Ampco Foods Inc. | Dough forming apparatus |
FR2411776A2 (en) * | 1977-12-16 | 1979-07-13 | Fischer Artur | DEVICE FOR INJECTING A HARDENABLE BINDER WITH SEVERAL CONSTITUENTS IN A DRILL HOLE IN A MASONRY |
US4402431A (en) * | 1980-09-22 | 1983-09-06 | Henkel Kommanditgesellschaft Auf Aktien | Dispenser container with compressible pump |
US4657161A (en) * | 1983-03-30 | 1987-04-14 | Yoshino Kogyosho Co., Ltd. | A Dispensing container for cream-like fluids |
EP0620047A1 (en) * | 1993-04-10 | 1994-10-19 | HILTI Aktiengesellschaft | Piston for extrusion system |
US6899254B1 (en) * | 2004-01-20 | 2005-05-31 | Plas-Pak Industries, Inc. | Venting seal for dispenser |
US11370597B2 (en) * | 2018-05-18 | 2022-06-28 | Silgan Dispensing Systems Le Treport | Piston for a reservoir of a dispenser of a fluid product without air intake |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GLENFED FINANCIAL CORPORATION, 104 CARNEGIE CENTER Free format text: SECURITY INTEREST;ASSIGNOR:GOLENBERT COMPANY, THE;REEL/FRAME:004858/0185 Effective date: 19880331 Owner name: GLENFED FINANCIAL CORPORATION, A CA CORP., NEW JER Free format text: SECURITY INTEREST;ASSIGNOR:GOLENBERT COMPANY, THE;REEL/FRAME:004858/0185 Effective date: 19880331 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, ONE FIRST NAT Free format text: SECURITY INTEREST;ASSIGNOR:GOLENBERG COMPANY, THE;REEL/FRAME:004850/0621 Effective date: 19880331 Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, ILLINOIS Free format text: SECURITY INTEREST;ASSIGNOR:GOLENBERG COMPANY, THE;REEL/FRAME:004850/0621 Effective date: 19880331 |