CA1092561A - Dispensers - Google Patents
DispensersInfo
- Publication number
- CA1092561A CA1092561A CA327,040A CA327040A CA1092561A CA 1092561 A CA1092561 A CA 1092561A CA 327040 A CA327040 A CA 327040A CA 1092561 A CA1092561 A CA 1092561A
- Authority
- CA
- Canada
- Prior art keywords
- plunger
- leading face
- container
- shape
- deformable
- 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
Links
Classifications
-
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to a plunger for use in excluding air from a container and especially from a cartridge dispenser. The invention comprises a plunger adapted to be inserted into a tube and having a leading face which may be inserted by a predetermined distance into the tube before forming a seal therewith. After insertion of the leading face by the predetermined distance, the plunger forms an air tight seal with the tube. The plunger is insertable into the tube by a further distance beyond the predetermined distance without reduction in the volume thereby contained. In preferred embodiments the means enabling insertion of the plunger to a distance before a seal results comprises one or more grooves extending along the plunger side wall from the leading face towards a trailing edge but stopping short thereof. The preferred means enabling a further insertion without reduction in volume contained comprise a membrane integral with the leading face which is deformable in a trailing direction. When inserted in a cartridge dispenser means may be provided whereby movement of the plunger in a trailing direction beyond a predetermined position may be prevented thereby maintaining the seal while permitting dispensation of contents.
The invention relates to a plunger for use in excluding air from a container and especially from a cartridge dispenser. The invention comprises a plunger adapted to be inserted into a tube and having a leading face which may be inserted by a predetermined distance into the tube before forming a seal therewith. After insertion of the leading face by the predetermined distance, the plunger forms an air tight seal with the tube. The plunger is insertable into the tube by a further distance beyond the predetermined distance without reduction in the volume thereby contained. In preferred embodiments the means enabling insertion of the plunger to a distance before a seal results comprises one or more grooves extending along the plunger side wall from the leading face towards a trailing edge but stopping short thereof. The preferred means enabling a further insertion without reduction in volume contained comprise a membrane integral with the leading face which is deformable in a trailing direction. When inserted in a cartridge dispenser means may be provided whereby movement of the plunger in a trailing direction beyond a predetermined position may be prevented thereby maintaining the seal while permitting dispensation of contents.
Description
iO9Z561 The present invention relates to a plunger for use in excluding air from a contalner. The plunger is of value in excluding air when filling and sealing a co~ltainer and is of particular value when the container is a dispensing tube or a cartridge tube of the type used for dispensing paste-like materials from a dispensing gun.
The invention will be described with particular reference to such cartridge tubes but is not limited to use with containers of that description.
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Cartridge tubes of the type under discussion generally have a plastics plunger inserted into their open ends after being filled with the required material. A silicone jelly is then applied to the exposed end of the plunger and the tube end is sealed by any convenient means. In use, the sealed end is opened and the cartridge inserted into the gun which applies axial force to the plunger so as to expel the contents of the tube in a controlled manner through a dispensing nozzle located usually at the opposite end of the tube from the plunger.
; When initially inserting the plunger prior to sealing the end of the tube it is essential that substantially all of the air trapped within the tube is expelled in order to prevent the contents from hardening prematurely inside the tube. It has been customary in the past to provide one or more removable breather tubes which extend past the plunger ;;
to permit the escape of air durir.g its insertion and which are withdrawn prior to sealing the tube.
.
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This process is cumbersome and it i8 an object of the present invention to provide a plunger which enables a cartridge to be filled in a much simpler operation.
According to one aspect the inventioniconsists in a plunger adapted for insertion into a hollow tubular shape, said shape having an open end and comprising at least a portion of the internal surface of a container, said plunger having a leading face and a peripheral skirt, said skirt being insertable into said shape for a pre- -determined distance from said open end without forming a seal between said plunger and said shape, said plunger being aAapted to provide a substantially air tight seal with said tubular shape after insertion therein of said leading face by said predetermined distance, said leading face having means deformable in a trailing direction after said plunger has been inserted into said shape by at least said predetermined distance whereby said plunger is moveable into said shape by a distance greater than said predetermined distance, saicl deformable means including a deformable domed membrane having a dome protruding in the insertion direction and being deformable to protrude in the trailing direction whereby, said plunger may be employed to exclude air from an , otherwise filled container.
j According to another aspect the invention consists in a method for sealing extrudable contents in a container when ~ -~ "~ ' ~
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`': ' ~' . ; ': , ::: ': ., :', ' ~ ' :~: , , ' . . ' lO9Z561 said container has an inner surface a portion of which comprises a tubular shape extending inwardly from a mouth thereof comprising the steps of:
filling said container with said contents to a first level, thereafter inserting into said container the leading face of a plunger according to the aspect and adapted to provide said seal therewith, said first level being at a lesser distance from said mouth than said predetermined distance, advancing said leading face into said container by a distance greater than said predetermined distance, to a position, and ` ;
thereafter preventing movement in a trailing direction beyond said position whereby air may substantially be excluded from said container and the contents sealed therein.
By way of example, two embodiments of the invention are illustrated in the accompanying drawings in which:
FIGURE 1 is a dual sectional side elevation showing a plunger at two separate stages of its insertion into a tube end;
FIGURE 2 is a dual section taken on line 2-2 of Fig. l;
FIGURE 3 is a view taken on line 3-3 of Fig. 2 but with the tube wall removed;
FIGURES 4, 5 and 6 correspond to Figs. 1, 2 and 3 respectively, but illustrate a second embodiment of the invention.
Referring to Figs. 1, 2 and 3 of the drawings, a plunger indicated generally at 10 in the left-hand portion of Fig. 1 is shown partly inserted into the open end of a tube 11 which ' `''. : ";, ,: ' ' ' . . . :' .': ' : :: ' . ' forms part of a container 12 adapted for dispensing from a nozzle 13. Nozzle 13 may be closed by means not illustrated such as a frangible diaphragm, a screw cap or the like.
Plunger 10 has a leading face 14, and a side edge 15 extending in a trailing direction from leading face 14.
Plunger 10 is generally cup shaped having leading face 14 and side edge 15 as outer surfaces and is a hollow body open at its trailing end. Side edge 15 is generally cylindrical in shape or may be slightly conical having a least diameter at leading face 14.
Side edge 15 is provided with at least one, and preferably two or more grooves 16 extending in a trailing direction from leading face 14 longitudinally of tube 11.
Grooves 16 stop short of the trailing edge 17 of plunger side edge 15.
Plunger side edge 15 has a diameter which at least between the trailing edge 17 of side edge 15 and groove 16 is of substantially the same diameter as the inner surface of tube 11 so as to provide a sealing fit therewith.
Thus when plunger 10 is inserted into tube 11 leading face 14 may first be inserted for a distance while groove 16 provides a communicatio~ from inside container 12 to outside. If the tube is substantiàlly filled with contents 19, for example a paste' any air trapped between contents 19 and the leading face 14 is expelled via groove 16 and if the leading face comes in contact with contents 19, a small amount of contents l9 may be extruded into groove 16 and even to outside container 12.
, , After insertion of leading face 14 into tube 11 by a - 5 - ~;
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~ iO9Z561 distance determined by the length of the grooves the position shown in the left-hand side of Fig. 1 is reached.
Groove 16 is then closed by virtue of the sealing fit of side edge 15 of plunger 10 with tube wall 1'. Further extrusion of contents and ingress of air is thereby prevented.
Preferably leading face 14 has integral therewith a membrane portion 18 which is deformable in a trailing direction. Further insertion of plunger 10 is possible for at least a distance the pressure of contents 19 against the leading face 14 causing distortion of the membrane in a trailing direction, that is to say outwardly from the container as shown in the right-hand side of Fig. 1. This distortion compensates in container volume for a further advance of leading face 14 against contents 19.
The plunger may then be prevented from retreat by any of - a number of methods which will be apparent to those skilled in the art. For preference the marginal edge of the tube ; ~ opening is rolled inwardly over the trailing edge 17 of the ~i plunger as shown at 20 and caused to gr~p with it so as to , 20 seal the end of the tube.
, If tube 11 is a cartridge tube adapted for insertion in ~r a dispensing gun, the grip provided between plunger 10 and rolled container wall 11 may be such that axial pressure provided by a cartridge gun against the plunger can release the grip whereby the plunger may be moved forwardly towards nozzle 13 to expel contents from the nozzle.
Figs. 4, 5 and 6 are identical with Figs. 1, 2 and 3 except that the central portion of the leading face 14 of the plunger is In the form of a dome 28 which initlally protrudes ~, - , , .. . : . . ~
lO9ZS~l from the leading face 14 in the leading direction as shown in the left-hand portion of ~ig. 4. After insertion of leading face 14 by the predetermined distance at which communication between the container volume and the exterior is cut off,further insertion creates pressure which causes dome shape 28 to deform in the manner of an oil can diaphragm resulting in a dome protruding in a trailing direction, that is to say, to form a concave depression in the leading face as shown in the right-hand side of Fig. 4.
The increase in volume resulting from this distortion enables plunger 10 to be further advanced into tube 11.
It will be understood that a container for use with a plunger as described need not be of tubular shape throughout its length and need not be provided with a dispensing nozzle.
Plungers according to the invention need not be hollow but may be of a solid tubular shape and other forms of passage communicating with the leading face and a side edge may be provided instead of or in addition to a side edge groove 16. For example the passage provided by groove 16 may instead be provided by an annular space bounded by a stepped-in portion of the side edge of the plunger and by the wall of a tube in which it is inserted.
A plunger according to the invention may conveniently be made from aluminum or an aluminum alloy by an impact extrusion process and preferably has a thin distortable membrane portion formed integrally therewith.
However in other embodiments a distortable diaphragm may be inserted in the tube ahead of the plunger and the plunger may be provided with a depression in its leading face, or - 7 ~
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~ 09Z561 with an orifice, so that tl~e diaphragm is distortable in a trailing direction in a manner similar to that described for membranes integral with the plunger. In that event the diaphragm may also have a dome initially protruding in the leading direction and distortable to a dome protruding in the trailing direction.
While in its simplest form the plunger side edge diameter is adapted to provide a sealing fit with the tubular inner surface of a container, it is desirable to provide a sealing compound or grease for example to that surface or at the trailing edge of the plunger to make the seal airtight when the plunger has been inserted into the tube sufficiently to close the exit from passage 16. Other sealing means may also be employed, for example, the plunger may be provided ¦ adjacent a trailing edge 17 with an O-ring sealed in a circumferential groove adapted to receive it.
With dispensing cartridges it is desirable, after ~ insertion of the leading face of the plunger in the tube by i at least the distance necessary to close air passages 16, that retreat of the plunger be prevented by the roll forming method described. However other methods may be used for example the external skirt of the tube may be inwardly crimped, or the skirt may be provided with inwardly crimpable i tags, or the plunger may be sealed in place by other means such as sealing compounds.
In other embodiments the plunger may be formed entirely of plastics material or may be a composite form for example ~ .
with a side edge of plastics and the leading edge or a diaphragm portion thereoE of a soft metallic material either , .- . : . : -~: ,. : ~ .: . , -~- 1092S61 separate from or moulded illtO the wall of the plastic side edge.
For use in cartridges the plunger may on its trailing surfaces be adapted to engage with a cartridge gun mechanism. When used in for example, a syringe, the plunger may have a handle integral therewith or be adapted to receive a handle at its trailing end. For use as a closure for a container the plunger may be provided with a handle.
P~ungers according to the invention may advantageously be used as a closure for a container when it is important to exclude air from the contents at the time of sealing and to maintain that exclusion until opening. In that event the plunger after reaching a sealing position in which passages 16 are closed, as described, may be adapted to be locked against retreat by means permitting subsequent retreat and removal of the plunger at a later date. For example a baynet key formation of the plunger may engage with a groove provided in the exterior skirt of the tube whereby the plunger may be rendered immovable by twisting in the manner of a baynet fitting light globe or the plunger may be held in ` place by screw and thread means.
Plungers according to the invention permit greatly simplified filling and sealing methods in the case of cartridge dispensers being filled for example with paste-like materlals. The plungers enable air to be expelled prior to ~' sealing and enable an airtight seal to be maintained.
Plungers as described may also be used to prevent o~erfilling of containers by expelling surplus content until a level, determined by the insertion distance at which the :, .
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plunger forms a seal with ~-he contaiher, is reached.
An added advantage of the use of deformable membranes with plungers according to the invention is that expension of contents, for example, due to temperature changes, is thereby permitted without allowing air to enter the tube and no empty space need be provided for expansion within the container.
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The invention will be described with particular reference to such cartridge tubes but is not limited to use with containers of that description.
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Cartridge tubes of the type under discussion generally have a plastics plunger inserted into their open ends after being filled with the required material. A silicone jelly is then applied to the exposed end of the plunger and the tube end is sealed by any convenient means. In use, the sealed end is opened and the cartridge inserted into the gun which applies axial force to the plunger so as to expel the contents of the tube in a controlled manner through a dispensing nozzle located usually at the opposite end of the tube from the plunger.
; When initially inserting the plunger prior to sealing the end of the tube it is essential that substantially all of the air trapped within the tube is expelled in order to prevent the contents from hardening prematurely inside the tube. It has been customary in the past to provide one or more removable breather tubes which extend past the plunger ;;
to permit the escape of air durir.g its insertion and which are withdrawn prior to sealing the tube.
.
.
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109256~
This process is cumbersome and it i8 an object of the present invention to provide a plunger which enables a cartridge to be filled in a much simpler operation.
According to one aspect the inventioniconsists in a plunger adapted for insertion into a hollow tubular shape, said shape having an open end and comprising at least a portion of the internal surface of a container, said plunger having a leading face and a peripheral skirt, said skirt being insertable into said shape for a pre- -determined distance from said open end without forming a seal between said plunger and said shape, said plunger being aAapted to provide a substantially air tight seal with said tubular shape after insertion therein of said leading face by said predetermined distance, said leading face having means deformable in a trailing direction after said plunger has been inserted into said shape by at least said predetermined distance whereby said plunger is moveable into said shape by a distance greater than said predetermined distance, saicl deformable means including a deformable domed membrane having a dome protruding in the insertion direction and being deformable to protrude in the trailing direction whereby, said plunger may be employed to exclude air from an , otherwise filled container.
j According to another aspect the invention consists in a method for sealing extrudable contents in a container when ~ -~ "~ ' ~
. , ,. . ,:. ; . , .~ ` ,.-, :
`': ' ~' . ; ': , ::: ': ., :', ' ~ ' :~: , , ' . . ' lO9Z561 said container has an inner surface a portion of which comprises a tubular shape extending inwardly from a mouth thereof comprising the steps of:
filling said container with said contents to a first level, thereafter inserting into said container the leading face of a plunger according to the aspect and adapted to provide said seal therewith, said first level being at a lesser distance from said mouth than said predetermined distance, advancing said leading face into said container by a distance greater than said predetermined distance, to a position, and ` ;
thereafter preventing movement in a trailing direction beyond said position whereby air may substantially be excluded from said container and the contents sealed therein.
By way of example, two embodiments of the invention are illustrated in the accompanying drawings in which:
FIGURE 1 is a dual sectional side elevation showing a plunger at two separate stages of its insertion into a tube end;
FIGURE 2 is a dual section taken on line 2-2 of Fig. l;
FIGURE 3 is a view taken on line 3-3 of Fig. 2 but with the tube wall removed;
FIGURES 4, 5 and 6 correspond to Figs. 1, 2 and 3 respectively, but illustrate a second embodiment of the invention.
Referring to Figs. 1, 2 and 3 of the drawings, a plunger indicated generally at 10 in the left-hand portion of Fig. 1 is shown partly inserted into the open end of a tube 11 which ' `''. : ";, ,: ' ' ' . . . :' .': ' : :: ' . ' forms part of a container 12 adapted for dispensing from a nozzle 13. Nozzle 13 may be closed by means not illustrated such as a frangible diaphragm, a screw cap or the like.
Plunger 10 has a leading face 14, and a side edge 15 extending in a trailing direction from leading face 14.
Plunger 10 is generally cup shaped having leading face 14 and side edge 15 as outer surfaces and is a hollow body open at its trailing end. Side edge 15 is generally cylindrical in shape or may be slightly conical having a least diameter at leading face 14.
Side edge 15 is provided with at least one, and preferably two or more grooves 16 extending in a trailing direction from leading face 14 longitudinally of tube 11.
Grooves 16 stop short of the trailing edge 17 of plunger side edge 15.
Plunger side edge 15 has a diameter which at least between the trailing edge 17 of side edge 15 and groove 16 is of substantially the same diameter as the inner surface of tube 11 so as to provide a sealing fit therewith.
Thus when plunger 10 is inserted into tube 11 leading face 14 may first be inserted for a distance while groove 16 provides a communicatio~ from inside container 12 to outside. If the tube is substantiàlly filled with contents 19, for example a paste' any air trapped between contents 19 and the leading face 14 is expelled via groove 16 and if the leading face comes in contact with contents 19, a small amount of contents l9 may be extruded into groove 16 and even to outside container 12.
, , After insertion of leading face 14 into tube 11 by a - 5 - ~;
:~ .
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~ iO9Z561 distance determined by the length of the grooves the position shown in the left-hand side of Fig. 1 is reached.
Groove 16 is then closed by virtue of the sealing fit of side edge 15 of plunger 10 with tube wall 1'. Further extrusion of contents and ingress of air is thereby prevented.
Preferably leading face 14 has integral therewith a membrane portion 18 which is deformable in a trailing direction. Further insertion of plunger 10 is possible for at least a distance the pressure of contents 19 against the leading face 14 causing distortion of the membrane in a trailing direction, that is to say outwardly from the container as shown in the right-hand side of Fig. 1. This distortion compensates in container volume for a further advance of leading face 14 against contents 19.
The plunger may then be prevented from retreat by any of - a number of methods which will be apparent to those skilled in the art. For preference the marginal edge of the tube ; ~ opening is rolled inwardly over the trailing edge 17 of the ~i plunger as shown at 20 and caused to gr~p with it so as to , 20 seal the end of the tube.
, If tube 11 is a cartridge tube adapted for insertion in ~r a dispensing gun, the grip provided between plunger 10 and rolled container wall 11 may be such that axial pressure provided by a cartridge gun against the plunger can release the grip whereby the plunger may be moved forwardly towards nozzle 13 to expel contents from the nozzle.
Figs. 4, 5 and 6 are identical with Figs. 1, 2 and 3 except that the central portion of the leading face 14 of the plunger is In the form of a dome 28 which initlally protrudes ~, - , , .. . : . . ~
lO9ZS~l from the leading face 14 in the leading direction as shown in the left-hand portion of ~ig. 4. After insertion of leading face 14 by the predetermined distance at which communication between the container volume and the exterior is cut off,further insertion creates pressure which causes dome shape 28 to deform in the manner of an oil can diaphragm resulting in a dome protruding in a trailing direction, that is to say, to form a concave depression in the leading face as shown in the right-hand side of Fig. 4.
The increase in volume resulting from this distortion enables plunger 10 to be further advanced into tube 11.
It will be understood that a container for use with a plunger as described need not be of tubular shape throughout its length and need not be provided with a dispensing nozzle.
Plungers according to the invention need not be hollow but may be of a solid tubular shape and other forms of passage communicating with the leading face and a side edge may be provided instead of or in addition to a side edge groove 16. For example the passage provided by groove 16 may instead be provided by an annular space bounded by a stepped-in portion of the side edge of the plunger and by the wall of a tube in which it is inserted.
A plunger according to the invention may conveniently be made from aluminum or an aluminum alloy by an impact extrusion process and preferably has a thin distortable membrane portion formed integrally therewith.
However in other embodiments a distortable diaphragm may be inserted in the tube ahead of the plunger and the plunger may be provided with a depression in its leading face, or - 7 ~
, . , - , . . . . . . . .
... . .. . ~ - .
1,. ,. .. . . . . . - . . .. . :: :
., . :. , - , ,,: - .- , ~ . ..
~ 09Z561 with an orifice, so that tl~e diaphragm is distortable in a trailing direction in a manner similar to that described for membranes integral with the plunger. In that event the diaphragm may also have a dome initially protruding in the leading direction and distortable to a dome protruding in the trailing direction.
While in its simplest form the plunger side edge diameter is adapted to provide a sealing fit with the tubular inner surface of a container, it is desirable to provide a sealing compound or grease for example to that surface or at the trailing edge of the plunger to make the seal airtight when the plunger has been inserted into the tube sufficiently to close the exit from passage 16. Other sealing means may also be employed, for example, the plunger may be provided ¦ adjacent a trailing edge 17 with an O-ring sealed in a circumferential groove adapted to receive it.
With dispensing cartridges it is desirable, after ~ insertion of the leading face of the plunger in the tube by i at least the distance necessary to close air passages 16, that retreat of the plunger be prevented by the roll forming method described. However other methods may be used for example the external skirt of the tube may be inwardly crimped, or the skirt may be provided with inwardly crimpable i tags, or the plunger may be sealed in place by other means such as sealing compounds.
In other embodiments the plunger may be formed entirely of plastics material or may be a composite form for example ~ .
with a side edge of plastics and the leading edge or a diaphragm portion thereoE of a soft metallic material either , .- . : . : -~: ,. : ~ .: . , -~- 1092S61 separate from or moulded illtO the wall of the plastic side edge.
For use in cartridges the plunger may on its trailing surfaces be adapted to engage with a cartridge gun mechanism. When used in for example, a syringe, the plunger may have a handle integral therewith or be adapted to receive a handle at its trailing end. For use as a closure for a container the plunger may be provided with a handle.
P~ungers according to the invention may advantageously be used as a closure for a container when it is important to exclude air from the contents at the time of sealing and to maintain that exclusion until opening. In that event the plunger after reaching a sealing position in which passages 16 are closed, as described, may be adapted to be locked against retreat by means permitting subsequent retreat and removal of the plunger at a later date. For example a baynet key formation of the plunger may engage with a groove provided in the exterior skirt of the tube whereby the plunger may be rendered immovable by twisting in the manner of a baynet fitting light globe or the plunger may be held in ` place by screw and thread means.
Plungers according to the invention permit greatly simplified filling and sealing methods in the case of cartridge dispensers being filled for example with paste-like materlals. The plungers enable air to be expelled prior to ~' sealing and enable an airtight seal to be maintained.
Plungers as described may also be used to prevent o~erfilling of containers by expelling surplus content until a level, determined by the insertion distance at which the :, .
., _ g _ .
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., . . . . . .. .. : : ~ , .. ... . . . .
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plunger forms a seal with ~-he contaiher, is reached.
An added advantage of the use of deformable membranes with plungers according to the invention is that expension of contents, for example, due to temperature changes, is thereby permitted without allowing air to enter the tube and no empty space need be provided for expansion within the container.
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Claims (25)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A plunger adapted for insertion into a hollow tubular shape, said shape having an open end and comprising at least a portion of the internal surface of a container, said plunger having a leading face and a peripheral skirt, said skirt being insertable into said shape for a pre-determined distance from said open end without forming a seal between said plunger and said shape, said plunger being adapted to provide a substantially air tight seal with said tubular shape after insertion therein of said leading face by said predetermined distance, said leading face having means deformable in a trailing direction after said plunger has been inserted into said shape by at least said predetermined distance whereby said plunger is moveable into said shape by a distance greater than said predetermined distance, said deformable means including a deformable domed membrane having a dome protruding in the insertion direction and being deformable to protrude in the trailing direction whereby, said plunger may be employed to exclude air from an otherwise filled container.
2. A plunger according to claim 1 wherein said deformable domed membrane is bistable, having one stable state in which the dome protrudes in the insertion direction and one stable state in which the dome protrudes in a trailing direction.
3. A plunger according to claim 1 wherein said membrane is formed integrally with said leading face.
4. A plunger according to claim 1 including passage means extending partially along said skirt from said leading face to an intermediate location.
5. A plunger according to claim 3 wherein said passage means comprise at least one groove in said skirt, said groove extending in a generally trailing direction from said leading face to said location.
6. A plunger according to any one of claims 3, 4 or 5 wherein said skirt has a trailing portion of a shape and dimensions adapted to correspond with a cross section of said tubular shape whereby to provide said seal.
7. A plunger according to claim 1 or claim 2 including a depression in said leading face and a deformable diaphragm inserted into a said shape in advance of said plunger and over-lying said depression so as to be deformable in a trailing direction.
8. A plunger according to claim 1 or claim 2 including an orifice in the leading face thereof and a deformable diaphragm inserted into said shape in advance of said plunger and overlying said orifice so as to be deformable in a trailing direction.
9. A plunger according to any one of claims 1 or 2 wherein said plunger is formed of an aluminum alloy.
10. A plunger according to claim 1 or claim 2 wherein said plunger is formed by impact extrusion.
11. A plunger according to claim 1 or claim 2 wherein said skirt has a generally cylindrical shape.
12. A plunger according to claim 1 or claim 2 wherein said skirt has a slightly conical shape having a least diameter at its leading face.
13. A plunger according to claim 1 or claim 2 wherein said leading face and said skirt are the outer surfaces of a hollow body open at a trailing end.
14. A container comprising a hollow tubular shape, having an open end and comprising at least a portion of the internal surface of said container, a plunger having a leading face and a peripheral skirt, said skirt being insertable into said shape for a predetermined distance from said open end without forming a seal between said plunger and said shape, said plunger providing substantially air tight seal with said tubular shape after insertion therein of said leading face by said predetermined distance, said leading face having means deformable in a trailing direction after said plunger has been inserted into said shape by at least said predetermined distance whereby said plunger is moveable into a said shape by a distance greater than said predetermined distance, said deformable means including a deformable domed membrane having a dome protruding in the insertion direction and being deformable to protrude in the trailing direction whereby said plunger may be employed to exclude air from an otherwise filled container.
15. A container according to claim 14 including means to prevent subsequent movement of said plunger in a trailing direction after insertion beyond said predetermined distance.
16. A container according to claim 15 wherein said movement prevention means comprise a marginal edge portion of said tubular shape which has been rolled inwardly to butt against said plunger.
17. A container according to claim 15 wherein said skirt has a slightly conical shape having a least diameter at its leading face and said movement prevention means comprise a marginal edge portion of said tubular shape which has been rolled inwardly to engage with and grip an exposed portion of said plunger skirt.
18. A container according to claim 14 further comprising a deformable diaphragm insertable in advance of said plunger leading face into said shape, said diaphragm overlying said leading face and being deformable in a trailing direction.
19. A container according to claim 18 wherein said diaphragm includes a dome shaped portion which protrudes from said leading face in an advance direction prior to deformation and which dome shape protrudes in a trailing direction after said deformation.
20. A container according to claim 14 wherein contents of said container dispensed from an orifice spaced apart from said opening in a generally leading direction.
21. A container according to claim 20 wherein said orifice is closed by a frangible closure.
22. A container according to claim 20 wherein said plunger is movable in said leading direction along said tubular shape whereby a quantity of a material contained between said leading face and said orifice may be expelled therefrom.
23. A container according to claim 21 wherein said container is a cartridge adapted for insertion in a dispensing gun of a type having means for moving said plunger to expel said material.
24. A method for sealing extrudable contents in a container when said container has an inner surface a portion of which comprises a tubular shape extending inwardly from a mouth thereof comprising the steps of:
filling said container with said contents to a first level, thereafter inserting into said container the leading face of a plunger according to either claim l or claim 2 and adapted to provide said seal therewith, said first level being at an equal or lesser distance from said mouth than said predetermined distance, advancing said leading face into said container by a distance greater than said predetermined distance, to a position, and thereafter preventing movement in a trailing direction beyond said position whereby air may substantially be excluded from said container and the contents sealed therein.
filling said container with said contents to a first level, thereafter inserting into said container the leading face of a plunger according to either claim l or claim 2 and adapted to provide said seal therewith, said first level being at an equal or lesser distance from said mouth than said predetermined distance, advancing said leading face into said container by a distance greater than said predetermined distance, to a position, and thereafter preventing movement in a trailing direction beyond said position whereby air may substantially be excluded from said container and the contents sealed therein.
25. A method according to claim 24 further comprising the step after said filling and prior said inserting, of placing in said container a domed membrane deformable in a trailing direction.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPD4295 | 1978-05-04 | ||
| AUPD429578 | 1978-05-04 | ||
| AUPD4361 | 1978-05-11 | ||
| AUPD436178 | 1978-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1092561A true CA1092561A (en) | 1980-12-30 |
Family
ID=25642218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA327,040A Expired CA1092561A (en) | 1978-05-04 | 1979-05-03 | Dispensers |
Country Status (8)
| Country | Link |
|---|---|
| CA (1) | CA1092561A (en) |
| DE (1) | DE2917464A1 (en) |
| ES (1) | ES480191A1 (en) |
| FI (1) | FI791429A (en) |
| FR (1) | FR2424855A1 (en) |
| GB (1) | GB2020254A (en) |
| IT (1) | IT1163991B (en) |
| NL (1) | NL7903488A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2918206A1 (en) * | 1979-05-05 | 1980-11-13 | Helmut Greven | CONTAINER FOR STORAGE AND DIRECT APPLICATION OF LIQUIDS AND PASTE |
| US4432473A (en) * | 1981-02-24 | 1984-02-21 | Sealright Co., Inc. | Cartridge-type dispenser |
| CA1249552A (en) * | 1983-03-16 | 1989-01-31 | Merlin R. Ruesch | Dripless syringe |
| US4708270A (en) * | 1983-03-16 | 1987-11-24 | Loctite Corporation | Dripless syringe |
| GB2152590A (en) * | 1984-01-09 | 1985-08-07 | Ernest E Murany | Dispensing apparatus |
| EP0860377A1 (en) * | 1997-02-20 | 1998-08-26 | Quick Coordination Center in het kort "Quick C.C." | Refill cartridge for dispensing sauces such as mayonnaise or ketchup on hamburger or the like |
| JP5551433B2 (en) * | 2006-06-13 | 2014-07-16 | ノードソン コーポレーション | Liquid discharge syringe |
| USD738495S1 (en) | 2013-08-23 | 2015-09-08 | Nordson Corporation | Piston for a liquid dispensing syringe |
| USD588693S1 (en) | 2007-06-12 | 2009-03-17 | Nordson Corporation | Liquid dispensing syringe |
-
1979
- 1979-04-24 GB GB7914194A patent/GB2020254A/en not_active Withdrawn
- 1979-04-30 DE DE19792917464 patent/DE2917464A1/en not_active Withdrawn
- 1979-05-03 FI FI791429A patent/FI791429A/en not_active Application Discontinuation
- 1979-05-03 ES ES480191A patent/ES480191A1/en not_active Expired
- 1979-05-03 NL NL7903488A patent/NL7903488A/en not_active Application Discontinuation
- 1979-05-03 CA CA327,040A patent/CA1092561A/en not_active Expired
- 1979-05-03 IT IT48930/79A patent/IT1163991B/en active
- 1979-05-04 FR FR7911268A patent/FR2424855A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| ES480191A1 (en) | 1980-02-01 |
| DE2917464A1 (en) | 1979-11-08 |
| FR2424855A1 (en) | 1979-11-30 |
| IT1163991B (en) | 1987-04-08 |
| NL7903488A (en) | 1979-11-06 |
| GB2020254A (en) | 1979-11-14 |
| IT7948930A0 (en) | 1979-05-03 |
| FI791429A (en) | 1979-11-05 |
| FR2424855B3 (en) | 1982-03-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |