Abstract: An apparatus for maintaining a sealed environment in the pressurized barrel reservoir injector which comprises a plastic closure cap that mates with a barrel reservoir with a dispensing tip. The closure cap has a top wall and a circular outer side wall extending downward from the top wall, and an annular sealing rib for engagement with an annular planar surface. Importantly, the cap also has three locking tabs that have a ascending horizontal top surface that engage external tabs on the reservoir, and also having an interior groove that houses a series of three nodes that are evenly spaced and positioned slightly ahead of the leading end of each locking tab. The external threading tabs of the reservoir pass counter-clockwise through the groove and pass over the nodes. The nodes act to maximize tension of the cap locking tab against the end of the external reservoir tab thereby preventing loosening of the cap.

Abstract: A syringe for controlling the amount of material or medical fluid in a syringe body which is expelled therefrom upon depression of a plunger in the syringe body. The syringe includes a syringe body having a chamber and a discharge end portion and an open opposite end portion, with a plunger received in the syringe body. A measuring ring having an inner thread in mesh with an outer thread on the plunger, with latch means for setting and holding the measuring ring and plunger and thus, permit an exact volume to be expelled from said chamber.

Abstract: This syringe for dispensing multiple doses of a liquid medicament one at a time has a cylindrical barrel for containing the medicament. At one end of the barrel is a single outlet opening. A plunger in the barrel discharges the medicament. A syringe cap rotatable mounted on the barrel has guide means restraining the cap against axial movement. Ratchet means on the cap and barrel permit only unidirectional rotation of the cap and sequentially retain the cap in equally spaced detent positions on the barrel. Nozzles on top of the cap have passages for ejecting the medicament. Each passage terminates in a hole in the top of the cap. Only one nozzle at a time communicates with the barrel vis the outlet opening in each detent position of the cap on the barrel.

Abstract: A hermetically sealed, nonrotatable closure for a bottle having a cylindrical body containing liquid and having an integral tubular neck formed with a free open end, comprises an annular flange on the tubular neck. A flexible stopper mounts on the flange. A cup shaped cap has a flat top wall with peripherally integral pliable skirt in which is an internal beveled ridge. The ridge engages the flange to lock the cap on the neck of the bottle. The top wall of the cap has a central hole to expose the stopper which can be pierced by a hypodermic needle to extract the liquid from the bottle while the cap remains unbroken on the neck of the bottle. Inside the skirt of the cap are circumferentially spaced teeth which engage in circumferential slots in the annular flange to cooperate with the ridge in preventing axial movement on the cap and stopper on the bottle.

Abstract: This cannula assembly for injecting medicinal fluid into an animal's teat has a first tapered cannula formed with a circumferential bead at its wider end. A flexible jacket encloses the cannula and has another bead detachably engaging the bead on the cannula. A tapered second cannula extends forwardly from the jacket. This cannula is shorter than the first cannula. A flexible cap has an internal bead which detachably engages a corresponding bead at the sider end of the second cannula. This assembly provides the user with a choice of cannulas of two different sizes in treating a teat. In another form of the invention, a second flexible jacket has a bead which detachably engages a bead on the second cannula. A third cannula extends forwardly from the second jacket. The flexible cap detachably engages a bead on the third cannula, so that the user has a choice of cannulas of three different lengths in treating a teat.

Abstract: A syringe for dispensing a liquid as an atomized spray has a cylindrical barrel, a plunger movable axially in the barrel, a tubular nozzle at one end of the barrel, and a short fixed stem in the nozzle. A cup shaped nozzle tip has internal first spaced lands to frictionally engage the stem and define axially extending passages therebetween. A centrally apertured end wall of the nozzle tip has circumferentially spaced second lands to serve as abutments for the end of the stem. Troughs in the end wall between the second lands define further passages with the end of the stem for turbulently passing the liquid out of the aperture as an atomized spray.

Abstract: This dripless automatic syringe for dispensing fluids has a barrel for containing the fluid, a nozzle for discharging the fluid, and a housing to which the barrel is attached. A piston rod in the housing carries a rigid sealed piston head in the barrel for pushing out the fluid. Behind the piston head a normally unflexed elastic disc in the housing. The disc flexes when the piston rod moves forwardly under a driving force. The disc unflexes to retract the piston rod and piston head slightly when the driving force stops to create a suction which draws fluid back into the nozzle and thereby prevents dripping. The disc has an integral nipple which frictionally grips the rod to hold it in place, when the driving force ceases. The nipple permits axial rearward movement of the piston rod by an externally applied force for filling the barrel with fluid.

Abstract: This dispenser for a viscous fluid comprises a cylindrical barrel having a nozzle at one end thereof for passing a fluid to fill the barrel and to discharge the fluid from the barrel. A flexible cylindrical piston head fits frictionally in the barrel to seal the fluid therein. The piston head is moved axially to discharge the fluid from the barrel. A multiplicity of short passages are defined by ridges or formed by narrow grooves on or in the inside wall of the barrel near the nozzle. The passages are only slightly longer than the axial length of the piston head to pass air entrapped between the piston head and fluid, axially of the barrel passed the piston head. The fluid fills the barrel and abuts the piston head, so that no air bubbles are discharged with the fluid from the nozzle. The hardness of the piston head is such that the sides of the head do not enter the passages which remain unobstructed.

Abstract: This apparatus for removing air from a hydraulic system having a master cylinder, a wheel cylinder disposed at a lower level than the master cylinder, with a hydraulic line connecting the cylinders, and an adjustable bleed nipple at the brake cylinder. The method includes the steps of filling a syringe with fluid and injecting it into the wheel cylinder via the open bleed nipple and through the hydraulic line to the master cylinder where air bubbles rise in the fluid therein and are dispersed to ambient air.

Abstract: A mixing syringe having an inner cylindrical barrel open at one end, and closed at its other end by a thin, tough, membrane bonded thereto. The barrel may contain a first liquid. A plunger inserted in the barrel has a sliding, sealing head which applies pressure to the liquid to rupture the membrane when the plunger is advanced. The barrel is slidably inserted in an open end of an outer barrel in sealing relationship therewith, and has a tip on the other end of the outer barrel. The outer barrel contains a liquid or other material to mix with the first liquid when the membrane is ruptured. The mixture is discharged from the outer barrel via the tip when the inner barrel is advanced axially in the outer barrel.

Abstract: A dispenser for liquids and viscous fluids has a syringe-like device with a barrel for containing fluid and a nozzle at one end. The plunger is movable axially in the barrel for discharging the fluid. At the inner end of the plunger is a flexible, elastic cap which has an end wall that is normally concave, but which is flattened out under pressure when the fluid is discharged. When pressure on the cap is removed, the cap reassumes its concave shape thereby creating a suction in the barrel which draws fluid back into the nozzle to prevent dripping.