EP0628354B1 - Dichtungsstopfer - Google Patents

Dichtungsstopfer Download PDF

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Publication number
EP0628354B1
EP0628354B1 EP94304071A EP94304071A EP0628354B1 EP 0628354 B1 EP0628354 B1 EP 0628354B1 EP 94304071 A EP94304071 A EP 94304071A EP 94304071 A EP94304071 A EP 94304071A EP 0628354 B1 EP0628354 B1 EP 0628354B1
Authority
EP
European Patent Office
Prior art keywords
plug member
cavity
sealing
plug
sealing plug
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
Application number
EP94304071A
Other languages
English (en)
French (fr)
Other versions
EP0628354A1 (de
Inventor
Leslie Rowland Marchant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EUROBOND ADHESIVES Ltd
Original Assignee
EUROBOND ADHESIVES Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EUROBOND ADHESIVES Ltd filed Critical EUROBOND ADHESIVES Ltd
Publication of EP0628354A1 publication Critical patent/EP0628354A1/de
Application granted granted Critical
Publication of EP0628354B1 publication Critical patent/EP0628354B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to sealing plugs which may be used for closing apertures.
  • the invention has particular but not exclusive relevance to sealing plugs for use in closing apertures in containers containing flowable products, e.g. adhesive dispensers.
  • syringe-type dispensers having a barrel with an open charging end through which the product is introduced into the dispenser and having at the opposite end a nozzle through which the product is to be dispensed. After the flowable product has been introduced into the barrel, it is necessary to seal the charging end with a suitable plug. In use, the nozzle end is opened and a suitable gun is used to force the sealing plug down the barrel as a syringe plunger to expel the contents.
  • WO90/05096 discloses a sealing arrangement for an adhesive dispenser intended to tackle this problem by enabling one to avoid the use of O-rings.
  • This provides a sealing plug having a front face including a bleed passage extending to the rear of the sealing plug where there is formed a cavity.
  • a stopper is provided for sealing the cavity which includes a projecting pin which enters into the rear of the bleed passage and closes it when the stopper is pressed home into the back of the sealing plug.
  • Such arrangements suffer from the disadvantage that the sealing plug cannot be fully assembled before being inserted into the syringe barrel. It is necessary to first push the main body of the sealing plug into position and only then to press the stopper into its home position.
  • flowable product may pass up through the bleed aperture and fill the cavity in the back of the sealing plug sufficiently that pushing the stopper home has the effect of displacing a certain amount of flowable product out of the back of the cavity.
  • it is difficult to get a good enough seal in such an arrangement without an 0-ring because the sealing plug does not have enough rigidity to exert sufficient radial force against the barrel.
  • the cavity allows the sealing plug to be too radially compressible. This cannot be counteracted by making the stopper a tight fit in the cavity because when the stopper is to be driven in, the sealing plug will press into the barrel, displacing the contents, if too much force is required.
  • EP-A-0351517 discloses a sealing plug assembly for pump-type toothpaste dispensers having a front plug member and a rear plug member.
  • a permanent bleed passageway is formed between the front and rear plug members communicating a cavity defined between them to the front face of the plug assembly. The passageway allows trapped air in the toothpaste dispenser to be vented during assembly until the passageway becomes blocked by toothpaste.
  • the present invention provides a sealing plug for closing an aperture comprising a front plug member and rear plug member, the front plug member having an external periphery for sealingly engaging the internal periphery of a said aperture and having a front face for introduction into the aperture which front face contains a bleed passage extending from said front face to connect with a cavity open to the rear of said front plug member, the rear plug member being sealingly and resiliently received in said cavity to close the same, wherein said rear plug member is displaceable by gas pressure applied via said bleed passage so as momentarily to break the seal between the cavity and rear plug member and allow the venting of said gas pressure past said rear plug member.
  • the invention provides a sealing plug for sealing a container containing a flowable product, which sealing plug comprises a bleed passage extending from a front part thereof for introduction into said container to an interior portion of said sealing plug, and means actuatable by pressure of gas trapped between said sealing plug and said product for venting said interior portion of said sealing plug so as to release said trapped gas without permitting said product to pass said sealing plug.
  • the cavity and the rear plug member are circular in cross-section and the resilient sealing connection therebetween is by virtue of an annular rib and an annular groove provided each on a respective one of said cavity interior and said rear plug member.
  • the annular groove is on the rear plug member and the annular rib is on the wall of the cavity.
  • gas bleed passage extending from said annular groove out of said sealing plug and a gas bleed passage leading to said annular groove from said cavity in the front plug member.
  • each said gas bleed passage leading to or from said annular groove is formed by a groove in the periphery of the rear plug member.
  • the gas bleed passage leading out of the annular groove may be formed in the wall of the front plug member defining the outer part of the cavity.
  • the gas bleed passages leading to and from said annular groove are off-set angularly from one another.
  • the front face of the rear plug member and the base of the cavity in the front plug member are so shaped that when the rear plug member is fully home in the cavity, a portion of the volume of the cavity remains unfilled by the rear plug member to accommodate flowable product and any residual trapped gas.
  • a sealing plug comprises a front plug member 10 and a rear plug member 12 both of circular transverse cross-section.
  • Front plug member 10 has an external periphery 14 shaped to form a good seal in a tubular syringe bore by the provision of two annular sealing ribs 16 toward the rear end of the front plug member and an outwardly flared front portion 18.
  • the front face 20 of the front plug member is inwardly dished.
  • a generally cylindrical cavity 22 is formed in the rear face of the front plug member and a gas bleed passage 24 extends from the front face to the base 26 of the cavity 22.
  • An annular rib 28 is provided on the interior wall of the cavity 22 approximately mid-way into the depth thereof.
  • the rear plug member has a plane rear face 30 and dished front face 32 separated by a generally cylindrical side wall having annular groove 34 formed therein for co-operation with the annular rib 28 to form a liquid tight seal when the groove and rib are fully engaged.
  • a first longitudinally running groove 36 is provided extending from the annular groove 34 to the rear face 30 of the rear plug member.
  • a second longitudinally running groove 38 is provided extending from the annular groove 34 to the front face 32 of the rear plug member.
  • the forward part of the cylindrical wall of the rear plug member is chamfered to provide an annular angularly forward facing surface 40 which co-operates with a similarly angled annular surface 42 formed between the base and the side wall of the cavity 22 and assists in forming a liquid tight seal when the rear plug member is fully home in the cavity.
  • the rear plug member 12 Prior to introduction into the barrel of a syringe containing a flowable material, the rear plug member 12 is pressed into the cavity 22 of the front plug member 10 as shown in Figure 2. A seal is established between the cylindrical periphery of the rear plug member 12 and the interior wall of the cavity 22. By virtue of the dished front face 32 of the rear plug member 12, there is a volume within the cavity which is unfilled by the rear plug member 12.
  • the front of the sealing plug is introduced into the charging aperture of a syringe containing a flowable material such as adhesive or an adhesive component, the sealing plug is pressed into the syringe by means such as a hollow piston acting on the rear of the front plug member but not pressing on the rear plug member as indicated by the arrows in Figure 2.
  • Air trapped within the syringe body between the flowable product contained therein and the front face 20 of the sealing plug is displaced through the gas bleed passage 24 into the unfilled volume of the cavity 22 where it is pressurised until it forces back the rear plug member 12 against the resilience provided by the engagement of the annular groove 34 and the annular rib 28.
  • the gas can vent into the annular groove 34 through the longitudinally extending gas bleed groove 38, can track around the annular groove and exit from the sealing plug by the longitudinally extending gas bleed groove 36.
  • the rear plug member 12 will be pushed forward by the pressure of the rib 28 cutting off this escape route.
  • a piston acting both on the rear plug member and on the rear face of the front plug member can be used to drive the sealing plug down the bore of the syringe.
  • More than one groove 36 and/or more than one groove 38 may be provided if desired but this is likely to be disadvantageous.
  • the invention is not restricted to sealing plugs for syringes but can be used in many other contexts where it may be desired to vent gas from the front face of a sealing plug whilst retaining flowable contents or simply to relieve pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Glass Compositions (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Claims (9)

  1. Dichtungsstopfen zum Schließen einer Öffnung, der ein vorderes Stopfenelement (10) und ein hinteres Stopfenelement (12) aufweist, wobei das vordere Stopfenelement (10) einen äußeren Umfang (14) für einen dichtenden Eingriff in den inneren Umfang der Öffnung, und eine vordere Fläche (20) zum Einführen in die Öffnung hat, wobei die vordere Fläche (20) einen Ablaßdurchgang (24) hat, der sich von der vorderen Fläche erstreckt und mit einer Vertiefung (22) verbunden ist, die zur Hinterseite des vorderen Stopfenelements offen ist, wobei das hintere Stopfenelement (12) dichtend und federnd in der Vertiefung (22) aufgenommen ist, um diese zu schließen, dadurch gekennzeichnet, daß das hintere Stopfenelement (12) durch einen über den Ablaßdurchgang (24) ausgeübten Gasdruck verschoben werden kann, so daß die Dichtung zwischen der Vertiefung und dem hinteren Stopfenelement für einen Augenblick geöffnet wird und ein Lüften des Gasdruckes an dem hinteren Stopfenelement vorbei ermöglicht wird.
  2. Dichtungsstopfen zum Dichten eines Behälters, welcher ein fließfähiges Produkt enthält, wobei der Dichtungsstopfen einen Ablaßdurchgang aufweist, welcher sich von einem vorderen Teil (20) desselben zum Einführen in den Behälter zu einem Innenabschnitt (22) des Dichtungsstopfens erstreckt, dadurch gekennzeichnet, daß der Dichtungsstopfen weiterhin eine Einrichtung aufweist, die durch den Druck von Gas, welches zwischen dem Dichtungsstopfen und dem Produkt gefangen ist, zum Lüften des Innenabschnitts des Dichtungsstopfens betätigbar ist, derart, daß das gefangene Gas freigegeben wird, ohne daß das Produkt an dem Dichtungsstopfen vorbei gelangen kann.
  3. Dichtungsstopfen nach Anspruch 2, der ein vorderes Stopfenelement (10) und ein hinteres Stopfenelement (12) aufweist, wobei das vordere Stopfenelement (10) einen äußeren Umfang (14) zum dichtenden Eingriff in den inneren Umfang einer Öffnung in dem Behälter und eine vordere Fläche (20) zum Einführen in die Öffnung hat, wobei die vordere Fläche den Ablaßdurchgang (24) enthält, welcher sich von der vorderen Fläche erstreckt und mit einer Vertiefung (22) verbunden ist, die zur Rückseite des vorderen Stopfenelements hin offen ist, wobei das hintere Stopfenelement (12) dichtend und federnd in der Vertiefung zum Schließen derselben aufgenommen ist, wobei das hintere Stopfenelement durch den Gasdruck verschoben werden kann, welcher über den Ablaßdurchgang ausgeübt wird, so daß die Dichtung zwischen der Vertiefung und dem hinteren Stopfenelement kurzzeitig geöffnet und ein Lüften des Gasdrucks an dem hinteren Stopfenelement vorbei ermöglicht wird.
  4. Dichtungsstopfen nach Anspruch 1 oder 3, wobei die Vertiefung (20) und das hintere Stopfenelement (12) einen kreisförmigen Querschnitt haben und die federnde, dichtende Verbindung zwischen ihnen mittels einer ringförmigen Rippe (28) und einer ringförmigen Nut (32) erfolgt, die an dem Inneren der Vertiefung bzw. dem hinteren Stopfenelement vorgesehen sind.
  5. Dichtungsstopfen nach Anspruch 4, wobei die ringförmige Nut (34) an dem hinteren Stopfenelement (12) und die ringförmige Rippe (28) an der Wand der Vertiefung (22) vorgesehen ist.
  6. Dichtungsstopfen nach Anspruch 5, bei welchem sich ein Gas-Ablaßdurchgang (36) von der ringförmigen Nut aus dem Dichtungsstopfen heraus erstreckt und ein Gas-Ablaßdurchgang (38) von der Vertiefung in dem vorderen Stopfenelement zu der ringförmigen Nut führt.
  7. Dichtungsstopfen nach Anspruch 6, wobei jeder Gas-Ablaßdurchgang, der zu der oder von der ringförmigen Nut (34) führt, durch eine Nut in dem Umfang des hinteren Stopfenelements gebildet ist.
  8. Dichtungsstopfen nach Anspruch 6 oder 7, wobei die Gas-Ablaßdurchgänge (36,38), die zu der und von der ringförmigen Nut führen, winkelig gegeneinander versetzt sind.
  9. Dichtungsstopfen nach einem der Ansprüche 3 bis 8, wobei die vordere Fläche des hinteren Stopfenelements und die Basis der Vertiefung in dem vorderen Stopfenelement so geformt sind, daß, wenn das hintere Stopfenelement ganz in der Vertiefung aufgenommen ist, ein Teil des Volumens der Vertiefung durch das hintere Stopfenelement ungefüllt bleibt, um ein fließfähiges Produkt und jegliches restliche gefangene Gas aufzunehmen.
EP94304071A 1993-06-11 1994-06-07 Dichtungsstopfer Expired - Lifetime EP0628354B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9312052A GB2278836B (en) 1993-06-11 1993-06-11 Sealing plug
GB9312052 1993-06-11

Publications (2)

Publication Number Publication Date
EP0628354A1 EP0628354A1 (de) 1994-12-14
EP0628354B1 true EP0628354B1 (de) 1999-09-01

Family

ID=10736992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94304071A Expired - Lifetime EP0628354B1 (de) 1993-06-11 1994-06-07 Dichtungsstopfer

Country Status (4)

Country Link
EP (1) EP0628354B1 (de)
AT (1) ATE183951T1 (de)
DE (1) DE69420315T2 (de)
GB (1) GB2278836B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9407627D0 (en) * 1994-04-13 1994-06-08 Adlock Packaging Ltd Sealing a flowable product in a dispenser

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819836A (en) * 1987-06-10 1989-04-11 Mega Plast Product- U. Verpackungsentwicklung Marketing Gesellschaft Mit Beschrankter Haftung & Co. Dispenser for dispensing paste compositions
EP0344491B1 (de) * 1988-06-03 1992-12-23 Wilhelm A. Keller Austragkartusche mit Vorratszylinder und Förderkolben
IT1217852B (it) * 1988-06-17 1990-03-30 Guala Spa Dispensatore di prodotti pastosi particolarmente di pasta dentifricia
EP0463991B1 (de) * 1990-06-21 1994-11-02 Wilhelm A. Keller Austragkartusche mit Vorratszylinder und Förderkolben

Also Published As

Publication number Publication date
GB2278836A (en) 1994-12-14
GB9312052D0 (en) 1993-07-28
DE69420315T2 (de) 2000-05-25
GB2278836B (en) 1996-10-23
EP0628354A1 (de) 1994-12-14
DE69420315D1 (de) 1999-10-07
ATE183951T1 (de) 1999-09-15

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