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WO1993003860A1 - Pistolet distributeur de doses - Google Patents

Pistolet distributeur de doses Download PDF

Info

Publication number
WO1993003860A1
WO1993003860A1 PCT/AU1992/000452 AU9200452W WO9303860A1 WO 1993003860 A1 WO1993003860 A1 WO 1993003860A1 AU 9200452 W AU9200452 W AU 9200452W WO 9303860 A1 WO9303860 A1 WO 9303860A1
Authority
WO
WIPO (PCT)
Prior art keywords
cartridge
gun
plunger rod
housing
plunger
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.)
Ceased
Application number
PCT/AU1992/000452
Other languages
English (en)
Inventor
Philip Bunce
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.)
Portland Surgical Products Pty Ltd
Enzacor Pty Ltd
Original Assignee
Portland Surgical Products Pty Ltd
Enzacor Pty 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 Portland Surgical Products Pty Ltd, Enzacor Pty Ltd filed Critical Portland Surgical Products Pty Ltd
Priority to AU24944/92A priority Critical patent/AU652664B2/en
Publication of WO1993003860A1 publication Critical patent/WO1993003860A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B05C17/01—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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61D—VETERINARY INSTRUMENTS, IMPLEMENTS, TOOLS, OR METHODS
    • A61D7/00—Devices or methods for introducing solid, liquid, or gaseous remedies or other materials into or onto the bodies of animals

Definitions

  • the present invention relates to a gun for dispensing doses of a fluid substance such as a veterinary or pharmaceutical product.
  • Certain veterinary and pharmaceutical products can be dispensed in measured doses in fluid form from a cartridge.
  • veterinary products for oral administration to pigs, sheep, cattle, horses and other animals, with the product being of viscous or gel-like form.
  • a gun for dispensing discrete doses of a fluid product from a cartridge associated with the gun, said gun comprising a plunger head engageable with a piston of the cartridge, and a trigger mechanism for advancing the plunger head in steps whereby to cause corresponding displacement of the cartridge piston and to thereby cause dispensing of a dose of the product
  • the gun body includes a housing at its front end to releasably receive the cartridge, means for releasably retaining the cartridge within the housing, and means within the base of the housing and operative to bite into a rear end edge of a body of the cartridge whereby the cartridge can be firmly anchored between the base of the housing and the retaining means.
  • the retaining means comprises slots in the housing adapted to cooperate with projections on the cartridge body whereby to provide a bayonet-type fitting of the cartridge within the housing.
  • a gun for dispensing discrete doses of a fluid product from a cartridge associated with the gun said gun comprising a plunger head engageable with a piston of the cartridge, and a trigger for advancing the plunger head in steps whereby to cause corresponding displacement of the cartridge piston and to thereby cause dispensing of a dose of the product, wherein the plunger head is carried by a plunger rod and the trigger is linked to a plunger rod by a ratchet mechanism, the gun further comprising means defining a forward stop to limit forward advance of the plunger rod, and means for providing a rearwards resilient bias to the plunger rod when in its forward stop position whereby to prevent stripping of teeth of the ratchet mechanism by continued actuation of the trigger.
  • the stop is carried by the plunger rod and is resiliently deformable upon engagement with a rearwardly-directed abutment on a body of the gun.
  • FIG. 1 is an exploded view of a gun in accordance with the preferred embodiment of the invention.
  • Figure la is a fragmentary section through a cartridge-receiving housing at a forward end of the gun;
  • Figure 2 is an exploded view of a cartridge for use with the gun;
  • Figure 3a is a schematic side view showing the rear end of the gun.
  • Figure 3b is a side view similar to Figure 3a, but showing the configuration when a plunger rod of the gun is in a forward stop position.
  • a gun in accordance with the preferred embodiment of the invention comprises a body 2 having at its forward end portion a forwardly-opening housing 4 for receiving a cartridge containing product to be dispensed.
  • the cartridge itself comprises a cylindrical body 6 of a plastics material with a dispensing nozzle 8 at its forward end and a piston 10 displaceable along the body 6 to discharge product through the nozzle 8.
  • the body 10 is open at its rear end to permit the piston 6 to be engaged by a plunger 12 at the forward end of a plunger rod 14 of the gun to advance the piston 10 in discrete steps within the cartridge body 6.
  • the detailed construction of the cartridge may be as described in our co-pending Australian patent application 89919/91.
  • the housing 4 releasably mounts the cartridge by a bayonet-type fitting.
  • the wall of the housing is formed with opposed arcuate apertures 16 which communicate with the forward end of the housing via longitudinal grooves 18 whereby lugs 20 on diametrically opposed sides of the cartridge body 6 can engage within the grooves 18 upon rearwards movement of the cartridge axially into the housing 4 to then engage within the apertures 16 by rotational movement of the cartridge.
  • the base of the housing 4 includes one or more forwardly projecting ribs 24 ( Figure la) extending across the width of the housing and which, when the cartridge is rotated into position, bite at different points into a chamfered rear end edge 6a of the cartridge body 6 to ensure that the cartridge is held very firmly between the base of the housing 4 and the apertures 16 in the wall of the housing.
  • the plunger rod 14 is mounted for axial movement within the gun body and carries at its forward end the head 12 which can be advanced by stepwise movement of the plunger rod 14 from a rear position adjacent the base of the housing 4 to a forward stop position which will be reached when substantially the entire contents of the cartridge have been dispensed.
  • Advance of the plunger rod 14 is effected by means of a trigger 26 mounted within a handle 2a of the gun body and cooperating with the rod 14 through a ratchet and pawl mechanism to cause advance of the rod through a discrete step at each actuation of the trigger 26.
  • the trigger 26 is pivotally mounted on a pivot 28 adjacent its upper end and is biased by a spring 30 to a forward position.
  • a first pawl 32 is pivotally attached to the trigger 26 beyond its pivot point 28 so as to be advanced forwardly when the trigger 26 is moved rearwardly into the handle 2a.
  • the pawl 32 is spring-biased into engagement with the teeth of a ratchet 34 formed along the underside of the plunger rod 14 in order to cause advance of the plunger rod 14.
  • a second pawl 36 mounted within the body behind the first pawl 32 is spring-biased into engagement with the ratchet teeth to hold the plunger rod 14 against retraction when the trigger 26 has been released and the first pawl 32 is displaced rearwardly in preparation for the next stroke.
  • the stroke length of the first pawl 32 and hence the dosage achieved at each actuation can be controlled by means of a variable stop 38 positioned forwardly of the pawl 32.
  • the variable stop 38 is in the form of a slide member displaceable laterally to present a selected one of a plurality of rearwardly-directed stop surfaces of different depth in front of the pawl in order to provide a variable forward stop position for the pawl 32.
  • a similar effect can be achieved by providing a variable rear stop position for the trigger 26 to control the stroke length by controlling the maximum depression of the trigger 26 into the handle 2a.
  • the variable stop for the trigger may comprise a cam 40 mounted on a wheel 42 within the trigger and engageable with an abutment 44 forming a fixed rear stop within the handle itself.
  • the gun is shown with both the slide 38 and the cam stop 40, in practice only one or other of these dosage controlling means will be provided.
  • the slide 38 is satisfactory when only a single adjustment in dosage is necessary whereby one or other of the dosage rates can be achieved with the slide in one of two end stop positions, whereas the cam 40 is more suitable when a greater number of adjustment steps is to be provided.
  • the plunger rod 14 projects from the rear of the gun body and carries at its rear end a knob 46.
  • the plunger rod 14 is reset into its rear position after reaching the forward end of its stroke, by rotating the knob 46 and thereby the plunger rod to disengage the ratchet teeth from the pawls 32, 36 whereby the rod 14 can be withdrawn to its rear stop position, the rod then being rotated to re-engage the pawls with the ratchet teeth in preparation for a fresh cartridge.
  • the ratchet is concave and the pawls are convex in order to provide a stable rotational position for the ratchet in engagement with the pawls.
  • the knob 46 also acts as a forward stop for the plunger rod 14 by abutment against the rear of the gun body.
  • the forward stop provided by the knob 46 is constructed as a resilient stop which applies a rearwardly-acting bias to the plunger rod 14 when in its forward stop position. This rearwardly-acting bias tends to cause slight retraction of the plunger rod when the trigger 26 is released and prevents a user from stripping the pawl or ratchet teeth by actuating the trigger 26 when the plunger rod is in its forward stop position.
  • the necessary resilience of the stop is formed by constructing the forward face of the knob 46 as a resilient annular flange 46a which engages a projecting rib 48 at the rear end of the gun body, rearwards deflection of the flange 46a upon engagement with the rib 48 being restricted by means of a rigid part of the knob 46 spaced from and behind the resilient flange 46a.
  • the rib 48 may be resiliently deflectable to provide the rearwards bias to the plunger rod 14 when in its forward stop position.
  • the plunger rod 14, including the forward head 12, the ratchet 34 and the stop-forming knob 46 at the rear may be integrally moulded from a suitable plastics.
  • the gun body 2, the trigger 26 and the pawls 32, 36 may also be moulded from plastics, the biasing springs which bias the pawls 32, 36 into engagement with the ratchet teeth preferably being integral parts of the pawls themselves.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Veterinary Medicine (AREA)
  • Coating Apparatus (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Mechanical Engineering (AREA)

Abstract

Pistolet destiné à distribuer des doses d'un produit à usage vétérinaire ou pharmaceutique contenu dans une cartouche qui est montée à l'aide d'un système à baïonnette (16) dans un boîtier au niveau de l'extrémité avant du pistolet. Ledit boîtier comprend des rebords (18) qui pénètrent dans un bord d'extrémité arrière de la cartouche, assurant ainsi que ladite cartouche est bien placée et retenue dans ledit boîtier. Le produit sort de la cartouche par un système de piston (14) commandé par une détente (26) par l'intermédiaire d'un mécanisme à cliquet. Les éléments principaux du pistolet, y compris le mécanisme à cliquet, sont fabriqués dans un matériau plastique et des systèmes sont prévus pour empêcher les dents de cliquet de s'user à cause de la mise en ÷uvre répétée de la déténte (26) lorsque le piston est parvenu à la limite de son mouvement.
PCT/AU1992/000452 1991-08-27 1992-08-27 Pistolet distributeur de doses Ceased WO1993003860A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU24944/92A AU652664B2 (en) 1991-08-27 1992-08-27 Dose dispensing gun

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPK798691 1991-08-27
AUPK7986 1991-08-27

Publications (1)

Publication Number Publication Date
WO1993003860A1 true WO1993003860A1 (fr) 1993-03-04

Family

ID=3775644

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1992/000452 Ceased WO1993003860A1 (fr) 1991-08-27 1992-08-27 Pistolet distributeur de doses

Country Status (1)

Country Link
WO (1) WO1993003860A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29515552U1 (de) * 1995-09-29 1997-02-06 Fischerwerke Artur Fischer Gmbh & Co Kg, 72178 Waldachtal Pistole für Polyurethanschaum o.dgl.
DE29903910U1 (de) 1999-03-05 1999-06-10 Schneider, Friedhelm, 51580 Reichshof Kartuschenpresse mit einer Kartuschenhalterung
DE29904071U1 (de) 1999-03-05 1999-06-17 Schneider, Friedhelm, 51580 Reichshof Kartuschenpresse mit einer Kartuschenhalterung
FR2781857A1 (fr) * 1998-07-28 2000-02-04 Labelvage Propulseur manuel a engrenage tubulaire, mu d'une seule main
FR2790639A1 (fr) 1999-03-09 2000-09-15 Jean Marc Sanz Dispositif d'introduction d'un flotteur a l'interieur d'un poisson mort servant d'appat de peche
WO2002051531A3 (fr) * 2000-12-22 2004-02-26 Baxter Int Procede et appareil permettant d'appliquer un materiau a composants multiples utile medicalement
WO2011062642A3 (fr) * 2009-11-23 2011-10-27 Graco Minnesota Inc. Actionneur de soupape

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2652955A (en) * 1948-02-24 1953-09-22 Crewe Mfg & Tool Co Calk gun and cartridge adapter
AU287754A (en) * 1954-09-03 1955-03-03 Ernest Charles Wright, and Hubert Percival Schofield Improvements in applicators or dispensers for delivering the liquid contents of containers
US2768768A (en) * 1953-02-27 1956-10-30 Gibson Homans Company Calking gun
DE3535229A1 (de) * 1985-10-02 1987-04-02 Graco Inc Vorrichtung zum verpressen von massen, insbesondere dichtungsmassen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2652955A (en) * 1948-02-24 1953-09-22 Crewe Mfg & Tool Co Calk gun and cartridge adapter
US2768768A (en) * 1953-02-27 1956-10-30 Gibson Homans Company Calking gun
AU287754A (en) * 1954-09-03 1955-03-03 Ernest Charles Wright, and Hubert Percival Schofield Improvements in applicators or dispensers for delivering the liquid contents of containers
AU2564767A (en) * 1967-08-08 1969-02-13 E. R. Squibb & Sons, Inc Fluid injector device
DE3535229A1 (de) * 1985-10-02 1987-04-02 Graco Inc Vorrichtung zum verpressen von massen, insbesondere dichtungsmassen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29515552U1 (de) * 1995-09-29 1997-02-06 Fischerwerke Artur Fischer Gmbh & Co Kg, 72178 Waldachtal Pistole für Polyurethanschaum o.dgl.
FR2781857A1 (fr) * 1998-07-28 2000-02-04 Labelvage Propulseur manuel a engrenage tubulaire, mu d'une seule main
DE29903910U1 (de) 1999-03-05 1999-06-10 Schneider, Friedhelm, 51580 Reichshof Kartuschenpresse mit einer Kartuschenhalterung
DE29904071U1 (de) 1999-03-05 1999-06-17 Schneider, Friedhelm, 51580 Reichshof Kartuschenpresse mit einer Kartuschenhalterung
FR2790639A1 (fr) 1999-03-09 2000-09-15 Jean Marc Sanz Dispositif d'introduction d'un flotteur a l'interieur d'un poisson mort servant d'appat de peche
WO2002051531A3 (fr) * 2000-12-22 2004-02-26 Baxter Int Procede et appareil permettant d'appliquer un materiau a composants multiples utile medicalement
WO2011062642A3 (fr) * 2009-11-23 2011-10-27 Graco Minnesota Inc. Actionneur de soupape
CN102648056A (zh) * 2009-11-23 2012-08-22 格瑞克明尼苏达有限公司 阀致动器
US8579160B2 (en) 2009-11-23 2013-11-12 Graco Minnesota, Inc. Valve actuator

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