Abstract: A manually-operated dispenser for user-controlled discharge of an internally-stored fluid includes a variable length assembly normally driven to its maximum longitudinal extension for fluid-tightly closing a fluid discharge opening and a vent opening disposed at opposite ends of an elongated housing, a piston bounding an end of an internal fluid reservoir and operatively movable along the housing for volumetrically reducing the reservoir and for driving stored fluid toward and through the discharge opening, and an actuator assembly manually operable by the user for causing controlled foreshortening of the variable length assembly whereby the fluid discharge and vent openings are concurrently opened permitting the forced discharge of a correspondingly controlled volume of stored fluid.

Abstract: An applicator delivers from side by side chambers a two-part urethane polymer composition in which the diisocyanate is differentially reactive with two amine components of side B such that an initial, faster reaction with one amine keeps viscosity low while a second, slower reaction with the second amine builds viscosity to a self-supporting paste outside the applicator.

Abstract: A dosing gun consists substantially of a housing having a trigger device with a trigger lever, with which a piston arranged on a piston rod can be operated evenly by a spring, which spring is initially compressed by a use of the trigger lever and a band brake. For this purpose a cord, which can be wound up onto a cord drum, is secured to an end of the piston rod. A brake drum which is secured an a drive shaft and can be operated by a brake band, is arranged in one piece on the cord drum. With the hand wheel mounted on a left side of the drive shaft, it is possible to wind the cord onto the cord drum and to compress the spring.

Abstract: The present invention relates to a device for dispensing a fluid from a container by means of the axial movement of a piston within the container under the influence of a plunger moved by the device, which device is adapted to receive the container on its forward end and to move the plunger axially forward towards or within the container so as to dispense a selected amount of fluid from the container upon each actuation of the device, characterized in that the device comprises:i. a disengageable drive mechanism adapted to be reciprocated axially of the device and adapted to positively engage the plunger whereby the plunger can be moved axially forward by the drive mechanism and to be disengaged from the plunger to permit relative axial movement between the drive mechanism and the plunger;ii. a disengagement means for selectively engaging or disengaging the drive means from the plunger;iii.

Abstract: A swivel-up type dispensing package is disclosed. The package includes a product chamber with an elevator therein to move the product axially. A feed screw and nut are associated with the elevator and relative rotary motion between the feed screw and nut serve to move the elevator axially. The package also includes a button adapted to be depressed by the user in a direction which is generally transverse to the axis of body of the dispensing package. The transverse movement of the button is converted to rotary input to either the feed screw or nut to cause one to rotate relative the other and thereby move the elevator. In the described embodiment the button has an integral pawl which during the transverse movement engages ratchet teeth affixed to a wheel mounted perpendicularly to the axis of the body, causing the wheel to rotate through an arc subtended by driven teeth.

Abstract: A dispenser for a flowable material comprising, a container having a chamber for retaining the material, and a nozzle defining an outlet orifice for dispensing the material from the container. The dispenser has a cap defining a cavity for covering the nozzle, with the cap being secured to the container at a plurality of rotational positions relative to the container. The cap has a plurality of spaced plugs extending from an inner portion of the cap in the cavity with each of the plugs registering with the nozzle and closing the orifice at different rotational positions of the cap.

Abstract: A positive displacement dispenser for storing and dispensing viscous materials like toothpaste is disclosed. The dispenser has a longitudinally-extending housing having an upper surface and side surfaces defining a chamber for storing viscous material, a discharge orifice in the housing through which material is dispensed, a threaded rod having an axis extending longitudinally through the chamber, and a piston mounted on the threaded rod by means of a central threaded opening. The piston is advanced along the threaded rod toward the discharge orifice to dispense material from the chamber by depressing a pivotal lever attached to the upper surface of the housing. This causes a drive bar projecting from the lever to move within a plane and turn a rotatable wheel coaxial with the threaded rod.

Abstract: A dispensing device of the hand-help pump type has an internal piston which is pulled up by a rod passing through the piston, which rod is moved by an actuator. When the contents of the piston are emptied, in order to attach a refill, a dog release mechanism operates to release the dogs which, in normal use when the device is full, function to prevent the piston from being drawn downwardly so that the piston can be removed to allow attachment of the refill which has a new piston.

Abstract: A dual agent dispensing container has plural chambers with a single independently acting agent dispensing mechanism in each chamber. The dispensing mechanism includes a key operating a push rod connected to a plunger via a one-way acting spring drive. The dispenser can be utilized to dispense plural agents together or separately in time.

Abstract: A tool for use in dispensing fluids, such a liquid two-part epoxies. The tool has an actuating mechanism which includes a lever which is adjustable to accommodate materials of varying viscosities. Adjustment is achieved by axially moving a bolt within the trigger of the tool, which results in a change in the mechanical advantage thereof.

Abstract: A package for containing and dispensing a viscous product such as toothpaste. The package includes a cylindrical container with a perforate spider member across an end of the container, such end serving as a dispensing end. A generally rigid, hemispherical pumping member with a discharge spout is reciprocatingly affixed to the dispensing end of the container, and is connected to a rodlike member which slidingly extends through the spider member and through a follower piston which is originally spaced away from the container. The container is operated by the application of hand pressure against the pumping member to move it toward the follower piston, with the pumping member being biased toward its original position upon the removal of the hand pressure by flexible portions of the rodlike member which engage the perforate spider and which are distorted by the movement of the rodlike member through the perforate spider.

Abstract: Hot melt guns comprising a melt body having a melt chamber and a mechanism for feeding a rod of solid hot melt material to the chamber for melting and dispensing. The feeding mechanism comprises a carriage mounted for movement towards and away from the melt body, a clamp member pivotally mounted on the carriage and a trigger to cause the clamp member to grip the rod and feed it into the melt chamber. The clamp member has two pivot pins projecting from opposite sides, each pin having an arcuate coaxial bearing portion and at least one flat face. The pins are received in bearing openings defined by circular bearing surfaces in the carriage, Assembly openings are provided in each bearing surface extending around a minor arc and sufficiently wide for the pins to pass through when the flat faces are suitably oriented relative to the openings.

Abstract: A gun-shaped stuffing material dispenser which is particularly employed to apply stuff substance to crevices on walls or the places, such as the clefts along the four sides of a window frame at its mount. The present disclosure characteristically consists of an integrally formed gun body, to the front end of which is removably pivotably secured a ring support member, and a piston rod which is provided with a push plate pivotably attached to the front end thereof so to effect ready packing, transportation and fast production purpose.

Abstract: A dispenser is provided which is especially useful in dispensing measured doses of topical preparations such as creams or ointments. The dispenser includes a container for holding a supply of topical preparation. A plunger assembly is operatively mounted to the container and includes a plunger piston and a plunger shaft which carries a series of longitudinally disposed teeth. The piston and plunger shaft include communicating openings. A cap seals off the mouth of the container. A portion of the plunger shaft extends through the cap externally of the container. A lever assembly is pivotally mounted on the cap and is operatively associated with the plunger shaft and piston, the lever assembly including teeth engaging means adapted to interact with the teeth of the plunger shaft.

Abstract: A tube dispenser utilizes a ratchet actuated pusher for squeezing the contents from a tube. In a first embodiment, a tube is supported on a support plate with a nozzle of the tube extending through an aperture formed in an end wall connected to the support plate. A handle, mounted on an opposite end wall, has an attached ratchet actuation lever. A toothed rod extends through an aperture in the end wall adjacent the handle. A pair of frame rods extend betwen the end walls. By squeezing the ratchet actuation lever, the pusher is caused to advance along the support plate, squeezing the tube walls between the pusher and the support plate. Three different configurations of the pusher are disclosed. The pusher may be formed as a cylindrical bar, a right angle channel, or as a plurality of rotatable rollers. In a second embodiment, the tube is supported within a receptacle, with a nozzle of the tube extending through an aperture in an end wall of the receptacle.

Abstract: A nozzle tip trimmer adapted for use between a manually actuated caulking gun handle and trigger assembly having a shaped body with a curved contour along one edge and a pivot adjacent one end of the curved contour. A cutting edge is disposed along a second edge of the shaped body opposite from the curved contour and a detent is carried by the body for selective engagement with predetermined positions on the caulking gun handle. The shaped body is pivoted on a shaft remote from the trigger pivot and is preferably formed with a recess providing a curved finger engaging portion adjacent the end of the curved contour opposite from the pivot and adapted for moving the shaped body about the pivot to displace the detent from one position to an adjacent position on the caulking gun handle.

Abstract: A paste dispenser comprising an elongated tubular body having a central bore for containing a paste product therein with a dispensing outlet positioned at one end portion of the tube, a follower plate movably disposed within the bore of the tubular body at one end portion thereof, defining an end portion for containing paste contained within the tube. The initial position of the plate is at an opposite end of the tube from the outlet when the tube is filled with paste, a transverse plate is positioned at the end portion of the tubular body adjacent the outlet, and a rotatable drum is mounted on the tubular body at the transverse plate. A pivotally moving support is mounted at one end portion of the tubular body providing a gripping surface which can be manually forced to move the pivot between first and second positions, and a biasing spring for urging the pivot to assume the first position combines with a ratchet for urging a rotation of the drum in one rotational direction.

Abstract: A glue gun includes a glue stick feed path, a heating assembly in the feed path and a glue stick feeding system. A trigger includes a gear rack extending along its upper surface and the feeding system further includes a pinion having rim teeth which engage a glue stick positioned in the feed path. The trigger is mounted for movement in a direction substantially parallel to the glue stick feed path axis and drives the pinion to advance the glue stick, when the trigger is squeezed. The trigger includes a pin extending in a guiding channel of the glue gun to permit tilting the rack toward the glue stick feed path. The pinion is mounted in a channel for displacement perpendicular to the feed path axis so that it bears against the glue stick when the trigger is tilted. The pinion may be provided with two rows of rim teeth and a portion of the glue stick periphery may extend into a trough formed between the rows.

Abstract: A metering device for dispensing a flowable substance from a container 10, in which a piston 11 with a piston rod 12 having a toothed portion 16 is disposed, includes a socket 17 adapted to be fixed to the container 10, an actuation lever 18 pivotal relative to the socket 17, a return spring 19 biassing the lever 18 to its rest position, an indexing detent 20 for advancing the piston rod 12 upon depression of the lever 18, and a retaining detent 21 for retaining the piston rod 12 in its respective position when the actuation lever 18 is released. The socket 17, actuation lever 18, reset spring 19, indexing detent 20 and retaining detent 21 are formed as one integral part injection-molded from synthetic resin. The socket 17 includes a slide 25 for fixing the part to a flange 14 provided at the rear end of the container 10.

Abstract: A toothpaste discharger comprises a container having a projected mouth at the lower portion and a socket behind the mouth, the socket being bored two holes at two side walls of the socket and an aperture at the top wall thereof, a washer inserted within the container, the washer being provided with an aperture approximately at the center thereof, and a driving means comprising a driving arm, a toothbrush receiving portion integrally under the driving arm, a pin at the top of the driving arm the pin extending with two flanges thereof within two holes of the socket, an elastic connecting portion in front of the pin, a driving rod connected onto the elastic connecting portion by means of a plug to extend into the container, a resilient element behind the pin to bias against the back portion of the socket, and a tongue portion pivoted on the driving arm to close the projected mouth in normal position.

Abstract: There is provided a dispenser for paste material, such as tooth paste, having a movable piston disposed in the dispenser casing below the paste material adapted to move in the direction of the nozzle opening and prevented from moving in the opposite direction by a first locking mechanism, and a push button for the displacement of an upper pressure cover which is disposed inside the dispenser casing above the material and which is coupled with the piston through a rod which penetrates and is force locked with the piston by means of a second locking mechanism working opposite to the first locking mechanism. A guide piece is provided which is connected with the rod and the pressure cover and extends above the pressure cover, passing through a guide opening in the casing top surmounting the pressure cover. The guide piece is connected to the push button mounted in the casing top.

Abstract: Dental cream in contact with a polyolefin resin surface of a package such as a laminate tube, a mechanical dispenser or a flexible sachet. The dental cream contains a dentally acceptable water-insoluble alkaline earth metal salt, a liquid vehicle and an alkali metal carboxymethyl cellulose gelling agent. The liquid vehicle contains water, glycerine and sorbitol and, as an additive to prevent syneresis due to contact between the dental cream and polyolefin resin, a stabilizer in the form of parahydroxybenzoate ester.

Abstract: A dispenser is provided for dispensing unit doses of a substance, such as tablets, pastes and the like having a tubular casing with a discharge opening at one end and a pressure bottom at the other end for the displacement of the discharge substance in the direction of the discharge opening, the pressure bottom being moved step by step in the direction of the discharge opening by the action of an operating handle positioned near the discharge opening and of at least one transport rack, the pressure bottom being blocked against backwards movement by at least one support rack located at the inner wall of the tubular casing, the transport rack and the support rack being mounted on an insert piece of the tube casing.

Abstract: The dispenser comprises a flexible sealing-tight vessel (1) disposed in a rigid chamber (3) containing a ratchet mechanism comprising ratchet teeth (6) secured to a tubular element (4) and pawls (11) on resilient arms (10) mounted on a disc (9) disposed above the flexible bag (1). Resilient elements (12) fastened to the disc (9) lower it in proportion as a drink is withdrawn from the flexible bag (1). The ratchet mechanism retains the disc (9) when the pressure in the bag (1) becomes higher than atmospheric pressure.

Abstract: The present invention is a positive displacement dispenser which is particularly useful in dispensing viscous materials such as toothpaste. This dispenser has a longitudinally-extending housing which defines a chamber for material to be dispensed, a discharge orifice in the housing through which the material is dispensed from the chamber, a threaded rod having an axis extending through the chamber, a piston with a threaded opening mounted on the rod so that rotation of the rod moves the piston, an actuating lever pivotally mounted to the housing, and a rotatable wheel operatively coupling the threaded rod and the actuating lever so that depression of the actuating lever causes the wheel to turn the threaded rod and advance the piston. The rotatable wheel is coaxially-mounted to the threaded rod and has a plurality of pins mounted on a circular path surrounding the axis of the wheel.

Abstract: A dispenser for paste-like substances is disclosed having a piston which is slidably disposed in a dispenser housing. The piston moves as the dispenser is being emptied toward a dispensing opening while being restrained from movement in the opposite direction. A press button is connected with a rod that extends through the piston and is coupled nonpositively with the piston through the intermediary of a locking device permitting the rod to move freely in one direction, but to carry the piston in the opposite direction. A membrane seals the end of the housing opposite the discharge opening. The piston rod is designed as a piercing tool for piercing the membrane.

Abstract: A dispenser for the individual portioned dispensing of tablets (1), pastes or the like, having a housing pipe (2) which is provided at one end with a delivery opening (6) and, opposite same, is equipped with a push bottom (13) for transporting of the material to be dispensed in the direction towards the delivery opening (6), which push bottom (13) can be displaced stepwise in the direction towards the delivery opening by means of an actuating handle which is adjacent the delivery opening and is connected to the push bottom. In order to obtain a favorable accommodation for the material to the dispensed, the bar connection between actuating handle (9) and push bottom (13) extends along the inner surface of the housing pipe wall, leaving the inside of the housing pipe (2) free.

Abstract: A ram gun for dispensing viscous fluid products such as adhesive, caulking materials and the like is disclosed. The gun can be rechargeable or can be employed as a single charge, disposable device. In a particular embodiment, the gun is formed in two parts by molding from plastic material. One part comprises the ram. The other comprises a container section for the material to be dispensed and is provided with integrally formed nozzle, handle and trigger. The trigger has an integrally formed pawl. The trigger is attached to the handle by a thin plastic strip acting as a living hinge and biasing the trigger away from the handle. The ram is slidably mounted in the container section and is incrementally advanced therein by operation of the pawl and rack which is actuated by squeezing of the handle and trigger.

Abstract: A caulking gun adapted to receive a tube-like cartridge of compound, wherein the cartridge has a piston in one end which expels compound from a dispensing nozzle as the piston is moved forward in the cartridge towards the dispensing nozzle. The gun includes a cartridge holder, a handle attached to the cartridge holder, and a trigger cooperating with the handle to urge a stem fixed against rotational movement relative to said cartridge holder and a disk fixed on the stem against rotational movement relative to the stem against the piston of the cartridge to expel compound from the discharge nozzle. One outwardly projecting prong is eccentrically positioned on the disk in contact relation with the piston of the cartridge for wedging into the contact surface of the piston without puncturing through the piston into the cartridge, whereby compound is prevented from leaking.

Abstract: This implement, which is particularly suitable for discharging pasty sealing compounds, has a cylinder for receiving a cartridge containing the substance, a plunger axially displaceable in this reception cylinder, a device for axially displacing the plunger, as well as a manually operable device for controlling the particular discharge quantity, while being equipped with a gas spring by means of which the plunger is axially displaceable.

Abstract: A push rod is forwarded to extrude viscous material in a tubular container from the nozzle. When the extrusion of viscous material is finished, i.e. stopping the forward operation of the push rod, the push rod is allowed to go back by a force resulted by expansion of air unavoidably contained, in the tubular container thereby absorbing expansion of air so as to prevent unwanted discharge of the viscous material due to an inner pressure of the tubular container.

Abstract: A pump for delivering precisely metered discrete quantities of solvent containing suspended solids in rapid cycles. The pump ejects the solvent from a cylinder in amounts proportional to discrete longitudinal movement of a piston inside the cylinder and eliminates internal valves that may become clogged.

Abstract: A dispenser comprising, a container having a chamber for retaining a flowable material, and a nozzle defining an outlet orifice. The dispenser has a device for pumping the material through the orifice. The dispenser has a cap having an outwardly directed tab having an opening to receive a toothbrush. The dispenser has a spool rotatably received in a hollow lower base of the container, and an elongated strand of floss wound upon the spool and extending through an opening in the base.

Abstract: A cartridge type dispensing gun comprises a housing and a barrel in which is mounted a cartridge containing a supply of viscous material. A plunger is driven to extend from the housing into the barrel for pushing a piston at the rear end of the cartridge to force the contents thereof out of a spout formed at the front end of the cartridge. The spout is in use to be cut off at an angle of about 45.degree. to leave an angled edge which is utilized as a spatula when applying a bead of viscous material to a surface being treated.

Abstract: A multiple, metered dosage device having an elongated body provided adjacent one end with a compartment or an ampule to contain material to be dispensed, a piston movable against the material to discharge it from a nozzle, a rod-like plunger movable by a pressure device against the piston to discharge material and a combination stop and release unit movable intermediately of the ends of the body between depressed and elevated positions respectively to engage a pair of racks of teeth on the plunger and including first and second teeth respectively engageable with the racks of teeth sequentially to permit the pressure device to advance the plunger and piston in similar metered, precise or predetermined increments of feeding in discharge direction and then stop the feeding movement and maintain such stopped position until the stop and release unit next is depressed.

Abstract: An attachment adapted for use on a device for melting and dispensing thermoplastic material having a thumb operated drive assembly for driving a block of thermoplastic material into the device. The attachment comprises a lever having an upper end adapted for engagement with the drive assembly and a lower end pivotably attached to a collar adapted to be releasably attached to a handgrip of the device. With the attachment in place, a user can squeeze the lever toward the handle with his hand to dispense the thermoplastic material.

Abstract: A paint dispenser in the form of a housing which mounts a paint filled syringe at one end and has a rod which moves axially, under the control of a trigger, to dispense paint from the syringe. Trigger movement in one direction acts through a cup shaped device to move the rod axially to feed paint, while the trigger is disengaged from the rod during its return movement.

Abstract: A positive displacement pump (10) for precisely dispensing liquids through a dispensing tube (126) in which there is a pump body (12) having a shaft (18) fitted for reciprocating therein. Incremental adjusting nuts (24, 26) on an outer end (22) of the shaft limit the movement thereof in a pumping direction. There is a first friction clamp (46) pivotally mounted adjacent one of its ends on the other end (48) of the shaft and a second friction clamp (82) is pivotally mounted adjacent one of its ends on a member (80) fixed to the body (12) adjacent the other end (48) of the shaft (18). The other ends of the clamps (46, 82) have cylindrical openings (66, 92) in substantial alignment to receive a hardened, smoothly finished pump rod (102). The pump rod is precisely aligned in bushings (98, 100) secured to the pump body. There are springs (70) and (90) biasing the clamps between the pivotal mountings and the cylindrical openings against the direction of pumping.

Abstract: A dispenser for viscous materials such as toothpaste is disclosed. The dispenser comprises an elongated container having a spout at its upper end and a rockable finger actuator operable to dispense contents when depressed. The actuator is connected to an elongated operating rod which is coupled to a follower by means of a spray clutch which causes the follower to move upwardly in the container in increments in response to rocking motion of the actuator. The lower end of the operating rod is connected to a base member having a resilient portion and a peripheral recess which receives the lower end of the container. The resilient portion of the base member pulls the operating rod downwardly for repositioning the same after each stroke of the actuator, and the operating rod pulls upwardly on the base member to securely mount the same to the container.

Abstract: A dispensing device including a hollow cylindrical body from which a high viscosity composition is discharged in precisely metered doses by a plunger rod longitudinally movable within the body. A series of projection are formed at equispaced, longitudinal intervals from each other on the plunger rod. A pair of parallel actuating arms pivotally mounted on the body extend along opposite side of the plunger rod and are formed with a pair of teeth, respectively, projecting inward toward the rod. By depressing the arms, the teeth pivot into engagement with one of the projections to advance the plunger within the body to expel a desired amount of composition. In a preferred embodiment, advancement of the plunger rod through a precise distance is automatically controlled via contact between the teeth with stop surfaces formed on the next in-line projection.

Abstract: A tube squeezer comprises a main frame in the shape of pistol, a thrust rod slidably supported by the main frame, an intermittent feeding mechanism for shifting the thrust rod intermittently, a holding part for holding tightly the tail end of a tube to be squeezed and a squeezing part fixed to the front end of the thrust rod for squeezing the tube. The squeezing part has two squeezing members between which the tube is squeezed. With the tail end of the tube held by the holding part, the squeezing part is moved forward intermittently by actuating a trigger lever.

Abstract: A block of solid thermoplastic material comprising alternating sections of circular and rectangular cross section, a device for melting and dispensing thermoplastic material having a thumb operated drive assembly for driving the block into the device, and a molding mechanism including two chain like structures that move along linear path portions with molds included in the structures in face to face relationship while molten thermoplastic is injected in an inlet end of the linear path portion to continuously mold the block.

Abstract: A repeating dispenser for dispensing uniform quantities of liquid includes an actuator rotatably connected to an actuating button. The actuator is biased upward by a spring towards a downwardly facing abutment in the non-actuated condition of the dispenser and is connected through a vertically displaceable rack shaft to a slide which releaseably mounts a cylinder piston device comprising a plurality of identical pistons and cylinders. An operating rod connects the slide to a suction button which is slideable along the outside surface of the dispenser. A pawl cooperates with the rack shaft and is kept from engagement with the rack shaft in the non-actuated condition of the dispenser. The actuating button includes a series of step-like stop portions engageable with an upwardly facing abutment to allow the repeated dispensing of uniform quantities of liquid.

Abstract: A manually operated actuator is described with which small incremental motions of a rod are obtained to advance a piston of a prefilled syringe. The device employs a reciprocally actuated drive element with a hole through which the rod passes freely when the drive element is in a release position. When the drive element is pivoted to a rod engaging position a pair of edges formed by the hole engage the rod and advance it an increment depending upon the amount of linear movement of the drive element. A back-up inhibitor is employed to prevent the rod from moving back when the drive element is returned to a release position. The back-up inhibitor is syringe responsive by employing a mechanism which causes engagement of the rod by the inhibitor when a syringe is attached to the actuator housing. A syringe with specially adapted flanges is described for use with the actuator.

Abstract: A precision injection system for intralignmental anesthesia and the like having a syringe with a tubular handle portion which is removably connected a tubular headpiece as a longitudinal extension thereof. The headpiece receives a carpule cartridge with injection contents monitored during injections through elongate windows on opposite sides of the headpiece. A dosing plunger housed in the handle portion in a retracted start position is activated by a servo-dosing lever and advances incrementally axially into the headpiece for delivery of metered quantities of the contents of the carpule cartridge each time the servo-dosing lever is actuated. Provision is made for semiautomatic resetting of the dosing plunger to a retracted start position by depressing a resetting key and raising the syringe to a generally vertically raised position.

Abstract: A no drip caulking gun which includes a rigid open barrel. The caulking cartridge is inserted in the barrel. A rod is coaxially movable with the barrel. At the end of the rod a plunger is mounted. The forward motion of the plunger against the cartridge forces the caulking compound out of the cartridge, when the forward motion is stopped the built up pressure in the cartridge kicks the rod backwardly.

Abstract: A device for the measured or dosed dispensing of a putty-like or paste-like multi-component substance stored in separate containers includes a housing for holding the containers with a separate piston and piston rod unit for each container mounted in the housing. To prevent displacement of the piston-piston rod unit in the direction opposite to the dispensing direction, each piston rod is provided with a stop member. By pressing a hand lever pivotally mounted in the housing, a drive device connected to the lever grips the piston-piston rod units and moves them in the dispensing direction. The stop member permits movement in the dispensing direction but prevents the movement of the piston rod in the opposite direction when the hand lever-drive device is released.

Abstract: A syringe comprises a body member detachably secured onto one end of a syringe barrel provided at its other end with a delivery tube and containing a movable piston member; a piston actuating assembly movably mounted in the body member and comprising a tube generally coaxial with the barrel and a rod movably mounted within the tube; and a pawl for moving said piston actuating assembly whereby the tube is first displaced to move the piston to the distal end of the barrel and the rod is then moved to pierce the central region of the piston member and to pass through the piston into the delivery tube.

Abstract: A mechanism is described which employs a safety element for preventing the application of excessive force to a linkage. In several embodiments the safety device comprises a spring which allows relative movement between a trigger and the linkage. The safety device may, however, be a mechanical fuse.The inventive safety device is embodied in a hot glue gun so that the safety device prevents the application of excessive force to the linkage which advances glue. Damage to the glue gun is thus avoided.Also disclosed is a unique return spring for a mechanism such as the glue gripper of a glue gun. The return spring allows rotation of the gripping element to occur before linear movement of the glue stick.

Abstract: A dosage dispenser comprises a rack having a one-way engagement connection with a piston slidable in a barrel. Reciprocation of the rack is actuated by an obliquely movable slide cammingly engaging the rack and results in incremental advance of the piston to dispense the product, for example toothpaste. The slide is alongside the discharge end of the barrel so the product can be aimed accurately.