Abstract: An assisting tool for pressing a piston while fixing in place a syringe or a similar instrument which contains a highly viscous chemical agent, so as to extrude the chemical agent, as well as a method for extruding a chemical agent using the same. The chemical-agent extrusion assisting-tool includes a tool body in the form of a cylindrical body having a space formed therein for accommodating a tubular container, such as a syringe, which contains a highly viscous chemical, such as calcium-phosphate-based cement formed by kneading a calcium phosphate powder and a kneading liquid composed of a polysaccharide-containing aqueous solution, and an outlet formed at its bottom end. The cylindrical body has a cylindrical space formed therein so as to open at an upper end surface thereof.

Abstract: A bone cement delivery apparatus is provided which includes a body, a ram, a trigger mechanism, and a pawl assembly. The body is configured to support a bone cement dispensing container. The ram is carried by the body and is configured to advance relative to the body to urge bone cement from the dispensing container. The trigger mechanism is located on the body and is configured for actuation to advance the ram. The pawl assembly is carried by the trigger mechanism to engage the ram, the pawl assembly comprising a pawl is carried by the trigger mechanism infinitely adjustable in relation with the trigger mechanism between a relatively low force position and a relatively high force position.

Abstract: A glue dispensing gun includes a barrel, a center rod, an eccentric transmission member, and a trigger. The barrel is used to accommodate a glue container and is provided with a receiving slot in which the eccentric transmission member is located such that the eccentric transmission member is fastened to the trigger. The eccentric transmission member is formed of a guide block, a bearing and a push block. The guide block is actuated by the trigger to turn eccentrically so as to cause the push block to push a pushing piece of the center rod, thereby resulting in the forward movement of the center rod. The center rod is provided with a recovery spring and a retaining piece which is in contact with the bearing of the eccentric transmission member, thereby enabling the trigger to control the forward and the backward motions of the center rod.

Abstract: Poly(alkyl methacrylate) bone cement ingredients are prepackaged as two separate components in two separate chambers of a container which can be connected to a static mixer, where both components are in a liquid form that is at least substantially air-free, and wherein the static mixer can mix the two liquid components without mechanical agitation and without the introduction of air into the two liquid components during the transfer of the two liquid components from their separate chambers through the static mixer. The first liquid component is formed by premixing a bone cement liquid monomer with bone cement polymer powder, a polymerization initiator, and a stabilizer to form a liquid mixture. The second liquid component is formed by premixing bone cement liquid monomer with bone cement polymer powder, if any, a stabilizer, and an activator to form a liquid mixture.

Abstract: A friction pad to be used in conjunction with a cartridge in a caulking (or any cartridge type) dispenser. The invention contemplates using the friction pad in conjunction with an existing caulking dispenser to prevent the rotation of the cartridge by simply placing the friction pad in the front end of the dispenser. In its most basic embodiment, the present invention contemplates a friction pad adapted to be fitted between a front face of a cartridge type dispenser and a cartridge to prevent rotation of the cartridge, the friction pad comprises: a front face adapted to be fitted in engagement with front end of the dispenser; and a back face adapted to be fitted in engagement with the cartridge.

Abstract: A device and method for dispensing flowable materials from a plurality of cartridge assemblies. Under the preferred embodiment, the device comprises a receptacle for carrying a plurality of cartridge assemblies therein. The cartridge assemblies each have a longitudinal axis and include a dispensing nozzle and an elongated tubular wall portion for containing a flowable material therein for dispensing. The wall portion is formed of a material that can be cut by a cutting surface. A drive mechanism is provided for moving an elongate drive rod in a direction parallel to the longitudinal axis. A web assembly is secured to the drive rod, the web assembly including a plurality of ejectors extending therefrom. Each ejector is arranged for reciprocal movement along the longitudinal axis within one of the cartridge assemblies between a forward ejecting direction to dispense the flowable material it contains and a return direction.

Abstract: The invention provides a caulk storage and dispensing system having a reusable sealing device and a caulk dispensing container. The reusable sealing device has a threaded portion disposed on a pin section. The threaded portion seals the caulk dispensing container and assists in removing the reusable sealing device from the caulk dispensing container. The threaded portion may be tapered or straight and may have a constant or variable pitch. The caulk dispensing container has a nozzle surrounding a container opening for dispensing caulk. The reusable sealing device is inserted into the nozzle. The threaded portion may engage the caulk dispensing container and the nozzle interior. A head section may seal the nozzle opening. The reusable sealing device also forms a seal with the caulk. The caulk dries or hardens around the threaded portion, thus sealing the caulk dispensing container and forming a screw hole.

Abstract: An end disk construction and connection for food sauce dispensing cartridges and other food containers. An end disk through which food sauce may be dispensed is fitted in the dispensing end of a cartridge that holds the sauce. The disk initially has a projecting peripheral skirt which fits against the side wall of the cartridge. The end portion of the cartridge wall is crimped inwardly to fold the skirt into a lip which is doubled over on the peripheral area of the disk. The flange formed by the inwardly folded wall portion encloses the lip and its raw edge to isolate the edge from the food sauce. A bond is effected between the disk and the cartridge wall and flange by thermoplastic coating on the disk and cartridge body which is heated during the crimping process.

Abstract: A cartridge for use with a conventional caulking gun, the cartridge comprising a substantially rigid cartridge body having a cartridge nozzle end, a cartridge plunger end, and a cartridge nozzle edge. The cartridge also has at least one collapsible package that includes a package nozzle end, a package plunger end, a package nozzle end edge, and a package inside space where a package retaining collar has at least one inside perimeter edge that defines at least one collar passageway The at least one collapsible package is disposed at least partially within the substantially rigid cartridge body such that the package plunger end is disposed towards the cartridge plunger end and the package opening is disposed towards the nozzle end opening and the nozzle end opening is sufficiently hermetically sealed to allow drawing a vacuum.

Abstract: A unit dose storage and dispenser cartridge for a unit dose of an ingredient includes a storage and dispense container dispensably containing a unit dose of the ingredient. The container includes a cylindrical interior wall defining a cartridge passageway having an ingredient-containing ingredient storage cavity portion. The container further defines a dispense opening communicating with the ingredient storage cavity portion and includes a first scaling member removably sealing the dispense opening. A dispense piston is movable by a dasher rod through the ingredient storage cavity portion so as to dispense the unit dose of the ingredient through the dispense opening. An openable vent is positioned in registry with the cartridge passageway.

Abstract: A system dispenses a desired portion of frozen product at a uniform rate from a product container containing the frozen product. The product container has a spout, and a dispensing valve connected to the spout to seal the product container. The dispensing valve is used to control dispensing of the frozen product from the product container. A label, attached to the product container identifying the formulation of the frozen product, is read to determine at least the formulation of the frozen product. Based upon at least the formulation, a controller controls the applied force from a drive and applied the force to a piston in the product container in order to dispense the frozen product at a uniform rate. The force is adjusted by the controller such that the frozen product is dispensed at a uniform rate until the desired portion is dispensed. The product container is sufficiently rigid so as not to deform when the force is applied to dispense the frozen product.

Abstract: A disposable container for dental filling materials comprises a container body (1), which surrounds the useful space (5) and out of which the filling material may be pressed through a nozzle (2) by means of a movable piston (4). A nozzle (2) constructed as a separate component is mounted at a connecting point (6) on the container body (1). The nozzle (2) has a rotationally symmetrical shaft and a stop which is set back and projects radially. At the appropriately formed connecting point (6), the nozzle (2) can be welded to the container body (1) or joined thereto by adhesion. Other embodiments of nozzles can be connected to the container body (1) with form fit or force fit, for example by means of screw or bayonet closures.

Abstract: An apparatus (22) and method for detecting leaks in a pressurized air conditioning or refrigeration system (24) comprising a cartridge (26) is described. A facility (28) is for fluidly coupling the cartridge (26) to the pressurized system (24). An assemblage (30) is for forcing a secondary fluid (32) out of the cartridge (26), through the fluidly coupling facility (28) and into a service valve (34) of the pressurized system (24). The cartridge (26) has a first open end with an inner nozzle (33) which connects to the system being charged and an outer nozzle (37).

Abstract: A manually operated dispensing device for use with a double cartridge for dispensing two-component chemical systems includes a double thrust ram with two thrust ram parts each having a toothed surface on which teeth are provided. The width of the thrust ram parts may be equal, or alternatively, the one thrust ram part may be wider than the other. The dispensing device further includes a drive assembly for acting on the double thrust ram, which is actuated by a trigger lever. The drive assembly includes a drive member, which includes teeth for acting on the teeth of the double thrust ram. The toothed surface of the thrust ram parts are either provided with ribs arranged near the outer edges of the thrust ram parts or have no ribs at all. As a result, a maximum width of the teeth is obtained and a maximum force is transmitted.

Abstract: Provided is a novel device for dispensing pastry dough, frosting or icing from a cartridge. The device has a cartridge container and a hand-held gun. An electric motor having a piston is coupled to the cartridge container. The piston acts on a plunger of the cartridge to apply pressure on the pastry dough, frosting or icing to permit the pastry dough, frosting or icing move to the gun to be dispensed.

Abstract: Provided is a novel device for dispensing pastry dough, frosting or icing from a cartridge The device has a cartridge container and a hand-held gun. A hydraulic cylinder having a piston is coupled to the cartridge container. The piston acts on a plunger of the cartridge to apply pressure on the pastry dough, frosting or icing to permit the pastry dough, frosting or icing move to the gun to be dispensed. An alternative device utilizes a frosting cylinder in place of the cartridge.

Abstract: A system dispenses a desired portion of frozen product at a uniform rate from a product container containing the frozen product. The product container has a spout, and a dispensing valve connected to the spout to seal the product container. The dispensing valve is used to control dispensing of the frozen product from the product container. A label, attached to the product container identifying the formulation of the frozen product, is read to determine at least the formulation of the frozen product. Based upon at least the formulation, a controller controls the applied force from a drive and applied the force to a piston in the product container in order to dispense the frozen product at a uniform rate. The force is adjusted by the controller such that the frozen product is dispensed at a uniform rate until the desired portion is dispensed. The product container is sufficiently rigid so as not to deform when the force is applied to dispense the frozen product.

Abstract: A housing has a first, dispensing end and a second, opposite end. A lever is squeezed against the housing to move a plunger toward the dispensing end. When fully squeezed, the lever extends parallel to the plunger and the longitudinal axis of the housing. The extent to which the plunger advances may be adjusted by relocating the pivot axis defined between the lever and the housing. A resilient washer is mounted on the shaft of the plunger and disposed behind a shoulder on the housing. The resilient washer deflects and/or stretches forward when the plunger advances, and urges the plunger rearward upon release of the lever.

Abstract: A dispenser of paste material, such as toothpaste, having an outer housing with an open upper side and a dome at the lower side, the roof of which dome includes the closing body of an air entry valve, which air entry valve displaces into the open position when there is a negative pressure within the outer housing, the dispenser also having an inner housing that protrudes upwardly from the outer housing and which includes an application surface and a nozzle opening on its headpiece, wherein the inner housing can be pushed, using the application surface, against the spring force of a bellows that is disposed in the outer housing, itself being sealed off from the inner housing, the result being that, when this force application of force takes place, a transport slug, which travels within the inner housing in the direction of the nozzle opening, pushes material ahead of itself in response to air pressure that has accumulated behind it.

Abstract: An applicator and an electro-mechanical applicator drive system for automatically emptying the liquid components from respective syringes in a controlled manner for co-applying fibrin sealant components with a gas to form a spray. The applicator drive system includes a piston elevator section which moves the syringe pistons of the respective syringes in unison. The applicator drive system further includes at least one syringe piston force sensor which senses a force required by the piston elevator section to move at least one of the syringe pistons forward and outputs a force sensor signal. A controller is provided which controls movement of a piston elevator of the piston elevator section based on the force sensor signal.

Abstract: An extruding mechanism for a tubular bag and a method of extruding the contents of a tubular bag are provided, by which a sealing material or the like is extruded and discharged from a tubular bag with an extruding gun for a cartridge container, and which reduces the amount of discarded waste, thereby serving as one solution to environmental problems. The extruding mechanism includes an extruding gun having a holding base, and a stationary holding plate disposed on a front end portion of the holding base. The holding plate is provided with a notched portion opened upward. An extruding rod is equipped at its leading end with a pressing plate. A cylindrical member having a cylinder body is set on the holding base and accommodates the tubular bag and is opened at both ends, and a piston body is inserted into the cylinder body.

Abstract: The dual chamber dispenser consists of two tubular chambers each of which is connected to a pump. The pumps are self-priming and are of a type that draw the substances from the tubular chambers. There is an activator which also serves as the top of the dispenser, side view apertures, a foot for better stability and a spout that is angled for enhanced dispensing. The side view apertures allow for viewing the fill level of the tubular chambers. The pumps are of a type having an upper valve and a lower valve, with the upper valves a part of the piston's that move in and out of the pumping chambers. The valves in said pumps are positive closing by means of a biasing spring. The substances to be dispensed are maintained separate, one from the other, until the substances are dispensed.

Abstract: A cartridge for holding a supply of a flowable substance includes a cylindrical tube which is closed at one end by a slidable seal. An opposite end of the tube is closed by an integral end wall which is provided with a sealed nipple extending from the center thereof. The nipple is provided with an external thread. A line of weakness is formed about the tube near end wall. A flange extends radially from the outer circumferential surface of tube adjacent the line of weakness. A translucent strip is formed along the length of the tube to allow viewing of the position of the slidable seal within the tube. To use the cartridge in a grease gun, the seal is pulled out and the end wall cut off along the line of weakness. To use the cartridge in a caulking gun, the cartridge is simply dropped into the body of the caulking gun and the end of nipple cut off. To use the cartridge in a vacuum gun, the end of nipple is cut off and the nipple is screwed into the vacuum gun.

Abstract: An apparatus that dispenses material stored in a soft packet. The apparatus includes a barrel sized to contain the soft packet. The barrel has a front end and a back end. The apparatus also includes a cap removably engaged to the front end of the barrel. The cap has an orifice through which the material may flow. The cap also has inner dimensions sized to form a seal with a top portion of the soft packet to minimize any extraneous air trapped therebetween. The apparatus further includes a plunger positioned within the barrel. The plunger applies pressure to the soft packet when the plunger moves from the back end of the barrel toward the front end of the barrel to force the material out from the packet and through the orifice.

Abstract: The invention relates to a dispensing device for simultaneously dispensing fluid from at least two fluid containers fitted with plungers, wherein the device includes an actuating device having at least two output elements, a push element able to displace the output elements, a force element that acts on the push element in the direction of the fluid containers, and a brake element which acts on the push element and can be manually modified to cancel the effect of the force element.

Abstract: An ink feeding system for feeding ink to an ink fountain of a printing, duplicating or like machine includes a can holder for holding a can of printing ink. A support arm suspends the can holder and can above the ink fountain. A piston-and-cylinder device feeds ink from the suspended can through a hole in the closed bottom end of the can and into the ink fountain. A disposable gasket is placed on top of the ink in the can for engagement by a piston head of the piston-and-cylinder device.

Abstract: An improved piggyback dispensing feature for extended dispensing devices of tile type having a housing with a downwardly extending handle, a trigger pivoted to the handle, an extension bracket attached forwardly of the housing, a barrel assembly attached to the extension bracket opposite the housing, and a piston rod slidably supported in the housing and extension bracket and protruding into the barrel assembly. The improvement comprises an interchangeable push-disk piston mounted on the distal end of the piston rod, and a smaller barrel assembly adapted to be seated inside the other larger barrel assembly to accommodate a smaller-sized cartridge. The smaller barrel assembly piggybacks in the larger, and the push-disk piston swaps out, thereby making it possible to use one extended gun for at least two different-sized cartridges, such as the typical ¼ gallon cartridges and {fraction (1/10)}th gallon cartridges.

Abstract: An automatic lubricant dispenser has a lower housing part formed with an outlet, a piston displaceable along an axis in the lower part and forming therein a compartment, a spindle extending along the axis, threaded into the piston, having an upper end above the piston provided with a lower coupling half, and a body of fluent lubricant filling the compartment. An upper housing part removably securable to the lower part holds an electrical motor unit having an output shaft projecting downward at the axis and provided with an upper coupling half axially engageable with the lower coupling half. The coupling halves are axially engageable to rotationally couple the motor output shaft to the spindle so that electrical energization of the motor when the coupling halves are engaged displaces the piston and expresses lubricant from the outlet. A sensor connected to the shaft generates an output after a predetermined angular displacement of the shaft.

Abstract: Provided is a novel device for applying frosting or icing to a cake or pastry from a cartridge containing pastry dough, frosting or icing. The device has a walled cartridge container and a hand-held gun for dispensing pastry dough, icing or frosting.

Abstract: A fluid substance dispenser, includes: a main casing having a multiple number of partitioned, fluid substance storage spaces, each having a piston having a female threaded hole and a piston moving mechanism fitted inside the fluid substance storage space; a forward actuation shaft having a male thread mating the female threaded hole; and a shaft rotating mechanism for turning the forward actuation shaft. This shaft rotating mechanism is configured of a single forward-actuating knob rotatably supported by the main casing and gears for transmitting the rotation of the forward-actuating knob to each forward actuation shaft.

Abstract: A method and arrangement for supplying dye to a leak tester and injecting the dye into a sealed system by precharging a disposable plastic syringe with a sufficient volume of dye to conduct the leak testing. The precharged syringe is shipped to the tester who connects the syringe to a hose assembly having a check valve, and a Luer coupling adapter at one end and a Schrader at the other end, which is then connected to the system, and the syringe plunger advanced to inject the dye. An adjustable stop on the syringe plunger allows an accurately set portion of the total volume to be injected.

Abstract: The cartridge assembly for dispensing at least one component comprises a cartridge having a rigid cartridge cylinder, a package assembly having a membrane containing liquid chemical, the membrane having a closed inlet end and an outlet end and a piston assembly disposed in said cartridge assembly. The piston side end of the inner wall of the cartridge cylinder and the front of said piston assembly are formed thus that the membrane is turned outside-in within itself by the action of the piston provided with a sealing lip such that the inner surfaces of the turned outside-in wall portions of the membrane are sliding relative to each other during emptying of the package, sealing the gap betweeen the double walls. Such a device requires considerably less dispensing force which is important particularly for a hand driven apparatus, and allows an efficient sealing of the liquid while dispensing.

Abstract: A material dispenser for receiving a material container and for dispensing material from the container is disclosed. The material dispenser includes a frame having a body, depending handle and rails that extend forward from the body. The material dispenser also includes a trigger actuated plunger mechanism that is operative to push a piston in the material container to dispense material from the container. The material container is held in the material dispenser by a rear receptacle and a distal receptacle. The rear receptacle is coupled to the rails and may be pivoted between a position that is facing the distal receptacle and a position that is oblique to the distal receptacle. The distal receptacle is also coupled to the rails and includes an opening that is located between the rails, and a clip that can engage and retain the material container.

Abstract: Apparatus for dispensing liquid toner concentrate including a container containing liquid toner concentrate, mounting apparatus operative to secure the container while allowing for axial movement of the container and air pressure apparatus for causing axial movement of the container and movement of a movable partition in the canister to aid in selective dispensing of the liquid toner concentrate from the container.

Abstract: A caulking gun includes a frame connected in the body of the device, a motor and a first gear respectively connected to the two sidewalls. A shaft extends through the two sidewalls with a sleeve and a board respectively and movably mounted to the shaft. A second gear connected to an end of the shaft so as to engage with the first gear. A collar having a toothed end is fixedly connected to the shaft and engagable with a toothed end of the sleeve. A rack is engaged with the toothed outside of the sleeve and contacts the rear end of a tube of caulking. The board is pushed by a spring toward the sleeve and has two recesses defined in one of two sides thereof. The trigger has two protrusions so that the board is pushed by the protrusion to disengage from the collar when the trigger is not pulled. When the trigger is pulled, the protrusions are received in the recesses and the sleeve is engaged with collar.

Abstract: A caulking gun and cartridge combination is provided with afterflow prevention. The cartridge has a tubular body, a forward dispensing opening at a forward end of the tubular body, and a backwall movably disposed within the tubular body. The caulking gun has a trough for receiving the cartridge, and a piston movable parallel to the trough. A trigger handle is used for pushing the backwall froward within the tubular body and causing a reduction of volume within the chamber in the cartridge. The backwall slides substantially in a contactless manner within the tubular body, preferably by way of a reduced diameter of the backwall relative the inner diameter of the tubular body, so that it is pushed backwardly when the body retracts radially after actuation. Alternatively, the cartridge body may be prevented from expanding or may even be actively squeezed so that afterflow caused by the volume reduction of the relaxing tube body is safely prevented.

Abstract: A manually operated ejector receiving a cartridge containing viscous material, the chamber of which is provided with a lock for holding the cartridge, said lock being disposed for displacement in its lengthwise direction independently of the piston of the ejector.

Abstract: In the housing is a motor and gear train driven by the motor, the train adapted to selectively engage a gear rack secured to the compression element to drive it down to squeeze the collapsible frosting container. When the train has moved into engagement, it closes a switch activating the motor.

Abstract: A multipurpose dispenser system including a hand-held dispenser which is capable of dispensing viscous fluid and particulate materials. When dispensing viscous fluids, the dispenser precisely dispenses such materials without wasteful post-extrusion. The system also includes an adaptor for mounting a particulate material dispenser to the dispenser as well as particulate material dispenser cartridges suitable for mounting to the dispenser.

Abstract: Novel hand-held single or two-component viscous fluid material dispensing gun, particularly though not exclusively useful for dental use and the like, and using in-line longitudinal drive racks and fluid cartridge containers, the racks being driven longitudinally along a barrel by an electric motor that is preferably mounted and controlled in the handle transversely depending below the barrel.

Abstract: A dispenser for a single cartridge has a yoke pivotably mounted on a stock. The yoke has a square-section open end and a circular section closed end. One flat side on the square section end provide an abutment for defining the closed position of the yoke. The yoke has a similar flat surface engages the plate side of the yoke. The flat surface on the stock is easily formed in the manufacturing process.

Abstract: A free standing cordless gun for dispensing liquid glue that includes a housing that is pistol-shaped and dispensing apparatus that is contained in the housing for dispensing the liquid glue.

Abstract: The present invention provides a cylinder/piston type volume reduction container which does not occupy much space for storage and transportation, and is easy in disposal and recovery. The container comprises a head tubular body (1) an end of which is closed by an end wall (11) having an outlet (12) for content, a rear tubular body (2) which is fitted in the head tubular body and movable in an axial direction of the head tubular body, and a piston member (3) which is fitted in the rear tubular body and movable in an axial direction of the rear tubular body. The rear tubular body may comprise a plurality of tubular bodies nested in telescopic manner. The rear tubular body and the piston may respectively be fitted in the head tubular body and the rear tubular body by way of scraping members (21, 22, 31, 32) provided on an outer peripheral surface of the rear tubular body or the piston.

Abstract: An apparatus (22) for charging a pressurized system (24) comprising a lubricant canister (26). A facility (28) is for fluidly coupling the lubricant canister (26) to the pressurized system (24). An assemblage (30) is for forcing lubricant (32) out of the lubricant canister (26), through the fluidly coupling facility (28) and into a service valve (34) of the pressurized system (24).

Abstract: A pump dispenser suitable for striped toothpaste, comprising a pump head [1] and a replaceable reservoir [2] for the toothpaste, in which the toothpaste is packed in radially disposed segments, and the reservoir is locked against rotation relative to the pump head.

Abstract: A two-component fluid dispenser which can accurately mix two liquids of varying viscosity and then precisely deliver the mixture formed in discrete amounts. The mixture of the two components is delivered from a single delivery tube in a manner such that none of the mixture remains within the delivery tube at the completion of each mixing and delivery cycle. In one form of the apparatus, the single delivery tube of the apparatus is operably coupled with conventional hypodermic syringes of various sizes so that different fluids can be mixed in different ratios.

Abstract: A device for applying frosting or icing to a cake or pastry from a cartridge containing pastry dough, frosting or icing. The device has a walled cartridge container and a hand-held gun for dispensing pastry dough, icing or frosting.

Abstract: The positive displacement pump delivers the products uniformly and with a low force to actuate the pump. The uniform delivery results from a close slideable fitting of the upper part into the lower part. A low force to actuate is accomplished in part by reduced surface area contact of the upper portion and lower portion during slideably interfitting operation. This is accomplished preferably by having transverse ribs on the exterior surface of the upper part and longitudinal ribs on the interior surface of the lower part. As a result the contact of the upper part and lower part during use is a transverse rib/longitudinal rib contact. The longitudinal ribs preferably are parallel to the vertical axis of the base with no draft angle. Further, there is a locking mechanism between the an upper part shroud and rams located in the lower part. The locking mechanism controls the movement of the reusable shroud.

Abstract: A cartridge for flowable material has a flexible envelope having a first and a second opposed ends and defining an envelope volume for receiving the flowable material. A plunger is positioned at the first opposed end. A cover member is positioned at the second opposed end. The second opposed end has a dispensing opening. The dispensing opening has a dispensing diameter so dimensioned, according to a force exertable by the plunger in the envelope volume, a viscosity of the flowable material, and a flexibility of the envelope, as to ensure a minimum inner pressure in the envelope volume in order to prevent inward folding of the envelope into the interior of the envelope volume.

Abstract: A dispenser gun for selectively dispensing controlled quantities of viscous or semi-viscous materials, and in particular liquid pesticides or insecticides, employs a vacuum driven operating system for discharging and reloading the viscous or semi-viscous materials to be discharged. The dispenser gun is designed to create pressure differential in adjoining chambers which, in conjunction with a cooperating valve system, enables the discharge of precisely metered quantities of material and prevents continued and undesired discharge or dripping from a discharge nozzle after a preselected quantity of material has been discharged from the dispenser gun. The handle of the device includes structure for pre-selecting one or more predetermined quantities of material to be discharged from the dispenser in repeatable sequences. The dispenser gun also includes structure for removably receiving a replaceable reservoir of viscous or semi-viscous material to be discharged from the gun.