Abstract: A power injector 10 that includes a solenoid 23 that moves a piston to cause a liquid to be injected via the needle 13. A shroud 27 engages a switch 28 to cause electric energy to be delivered to the solenoid 24 to cause actuation thereof.

Abstract: An applicator (33) to deliver viscous liquids such as cream, mayonnaise or mustard. The applicator (33) includes a cylinder assembly (25) which receives a piston (4). The cylinder assembly (25) separates a pair of chambers (26, 27). The piston (4) includes a one-way valve (3) which is resiliently deflectable from apertures (28) in the piston to provide for the flow of liquid from the chamber (26) to the chamber (25). An inlet extends to the chamber (26) while an outlet valve (1) communicates with the chamber (24). This arrangement minimizes hand pressure required by an operator to manipulate the applicator (30) in delivering the viscous liquid.

Abstract: An applicator (10) to deliver a liquid via a needle (20). The applicator (10) includes a shroud (44) which cooperates with a trigger (41) and trigger lock (52) so that the needle (20) is only exposed upon actuation of the trigger (41) and liquid is only injected when the shroud (44) is retracted to a position at which a desired length of the needle (20) has penetrated.

Abstract: An applicator (10) to deliver a medication from a first interacting cylinder (15) and piston (16) and a marking dye from a second interacting cylinder (20) and piston (21). Extending from the second piston (21) is a piston rod (23) which is engaged by the second piston (16) so as to be moved thereby.

Abstract: An injector (10) having a needle (14) which is exposed by a retractable shroud (13). Mounted within the body (11) of the injector (10), is a first interacting piston (30) and cylinder (31) which cooperate to enclose a first space (33) which receives the liquid to be injected. A second interacting piston (26) and cylinder (27) cooperate to enclose a second space (28). A gas under pressure is delivered to the second space (28) to cause movement of the second piston (26). The second piston (26) is attached to the first piston (30) and therefore moves with it. The shroud (13) is operatively associated with a valve (35) to regulate the delivery of the gas under pressure to the space (28) to cause operation of the injector (10). A user of the injector (10) grips the body (11) by means of a handle portion (12) and presses the injector (10) against the skin of the animal. This causes retraction of the shroud (13) as the needle (14) penetrates.

Abstract: A mechanism to dispense a variety of medications to an animal. The mechanism includes a pump 14 which when operated delivers a dose of medication of predetermined volume to an associated dispenser 16, There is a plurality of pumps 14 each having an associated dispenser 16, Each dispenser 16, when operated, activates a control unit 13 which in turn activates the associated pump 14 so that a dose of predetermined volume is delivered to the dispenser 16.

Abstract: An applicator to apply a medication in liquid form to the skin or fleece of an animal. The applicator his a handle to be gripped by a user to move the applicator over the skin or fleece. Rotatably supported by the handle is a roller which is equipped with a cam track. Received within the cam track is a cam follower which causes reciprocation of a piston within a cylinder. The cylinder and piston co-operate to pump the liquid to a nozzle so that application of the liquid is metered in accordance with rotation of the roller.

Abstract: An attachment 1 for a hand gun 2 with a movable piston 4 actuated by a trigger means 11, which comprises a blade 3 to form a cut in a tree, and a fluid injection means 10 which instantaneously supplies a fluid dosage to the cut. The fuel to operate the hand gun 2, together with the fluid, are preferably provided in a backpack 43.

Abstract: A rumen injector to inject a predetermined volume of medication into an animal, said injector having a body with a handle gripped by the user, a cylinder fixed to the body, a piston movably associated with the cylinder so as to define a variable volume space, a needle communicating with said space, and wherein said piston is movable to a cocked position where it is retained until automatically released upon said needle being inserted into the animal a predetermined distance.

Abstract: An injector to deliver a predetermined quantity of liquid into an animal, said injector having a hollow body with a handle, an interacting piston and cylinder mounted within the body and cooperating to define a variable volume working space, an injector needle communicating with said space, a passage also communicating with said space to enable the delivery of liquid thereto, a shroud to selectively cover said needle, and wherein movement of said shroud beyond a predetermined position exposing said needle enables relative movement between the piston and cylinder to eject liquid through said needle.

Abstract: An injector to dispense pellets from a magazine rotatably supported in the injector, the injector has an indexing mechanism which causes indexing of the magazine, with the indexing mechanism being actuated by an injection rod which injects the pellets, and with the indexing operation taking place upon return of the indexing rod to its rest position.

Abstract: A multi dose injector having a pair of interacting pistons and cylinders enabling the delivery of two different liquids into an animal upon the single operation of a trigger.

Abstract: A rumen injector having a body, an interacting piston and cylinder mounted within the body, a needle fixed to the cylinder, and wherein the cylinder is movable from a rest position to a cocked position and said piston is movable within said cylinder from a rest position to a cocked position so that in use of the injector said cylinder is first released to cause insertion of the needle and then said piston is released to cause injection of a dose into the rumen of the animal.

Abstract: An injector to inject liquid into an animal, said injector being of generally cylindrical configuration and having a pre-loadable piston and cylinder which when operated eject liquid through a needle of the injector, said injector having a trigger movably mounted at one end, which trigger selectively permits relative movement of the piston and cylinder to eject liquid from within the injector.

Abstract: A gun adapted to eject pellets into animals and a magazine to contain the pellets, the gun includes an ejector rod which enters the magazine to eject a pellet therefrom, and an indexing rod which engages the magazine to cause indexing thereof.

Abstract: A drench gun having at least one interacting bore and piston to define a variable volume working space, a liquid exit from the working space, a liquid inlet to said working space, and a dose adjustment mechanism to vary the volume swept by the piston to adjust the dosage delivered by the gun. The dose adjustment mechanism comprises a body plug formed in two halves having a passage extending longitudinally therethrough, a movable sleeve located in the passage to abut the piston to adjustably limit movement thereto, and an adjustor projecting into the sleeve and adapted to rotate around the axis thereof. The adjustor and body plug are adapted to engage the sleeve so that upon rotation of said adjustor said sleeve is moved along longitudinally relative to the piston.

Abstract: A flow control apparatus positionable within the discharge nozzle of a drench gun to control leakage of liquid therethrough by means of a series of holes to increase the surface tension within the liquid adjacent the liquid outlet of the nozzle.

Abstract: A liquid dispensing gun employing an interacting bore, piston and piston rod which gun is provided with adjustment means to determine the volume of liquid delivered by the gun. The adjustment means being a series of projections extending radially from the peripheral surface of the piston rod and arranged thereon to selectively engage a circular member located around the rod, which circular member is provided with a series of recesses extending longitudinally adjacent the rod into which the projections may enter.

Abstract: A liquid dispensing gun employing two interacting bores and pistons to maintain the liquid inlet and outlet of this gun stationary with respect to the gun during operation. The gun is attachable to a liquid reservoir and may employ either a nozzle to deliver a dosage of liquid into the throat of an animal or to inject a dosage via a needle.