Abstract: A pump for pumping high viscosity lubricants such as wheel bearing grease comprising a pump tube adapted to be disposed within a container of the lubricant, a piston rod and piston movable within the tube, an outlet at the upper end of the tube, an inlet at the lower end, a check valve in the piston and a valve at the inlet. Upon the piston downstroke, the inlet is closed by the valve and lubricant is transferred through the check valve in the piston from below to above the piston. Upon the piston upstroke, lubricant above the piston is forced out the outlet and lubricant is drawn into the tube below the piston through the then open inlet. The inlet valve is constructed so that it cooperates with the piston to develop a vacuum at the inlet before the inlet is opened. Upon opening the inlet, there is then a sudden exposure of the lubricant surrounding the inlet to the vacuum which draws even high viscosity lubricant into the tube to prime it. Reliable pump priming is thus achieved.

Abstract: A sliding valve pump for oil wells which includes a working barrel having a plurality of apertures located in spaced relationship in the wall thereof and a pair of travelling valves fitted within the working barrel and carried by a plunger rod, the valves also having a plurality of apertures or ports for periodic registration with the ports in the working barrel wall to facilitate pumping of fluid from an oil reservoir or pool to the surface. The pump is designed to pull the oil-gas mixture from the reservoir pool into the lower section of the working barrel on the downward stroke, and to subsequently pump the collected oil through the barrel and tubing upwardly toward the surface on the upward stroke.

Abstract: A reciprocating pump for dispensing fluent substances comprises a piston slidable in a cylinder and defining a substance-trapping space at the inner end of the cylinder. Inlet and outlet ports are formed in the piston and connect with the space under the control of a tubular sleeve mounted on a reduced diameter inner end portion of the piston and capable of limited axial movement relative to the piston. Frictional engagement of the sleeve with the wall of the cylinder holds the sleeve stationary upon initial reciprocation of the piston within the cylinder and the piston slides through the sleeve to switch over the porting connections. During the subsequent portion of the stroke of the piston the sleeve and piston move as a unit.

Abstract: An arrangement has a hand-operated piston pump mountable on a neck of a bottle, and having a first portion outwardly embracing the neck and a second portion inwardly extending into the neck of the bottle. The first portion of the piston pump overlaps the neck over at least a part of its height and is supported by the same. The second portion is formed as a ring-shaped collar. For sealingly connecting the second portion to the neck of the bottle, there is provided as a rubber stopper located between the outer surface of the second portion of the piston pump and the inner surface of the neck of the bottle. The second portion may be provided with an inner thread which can mesh with an outer thread of the neck serving for screwing on a threaded cap. A member is further provided for detachably connecting a drink container to the arrangement so that the liquid withdrawing from the bottle travels directly into the container.

Abstract: A hand-operated pump includes a cylinder and a reciprocating plunger. The plunger is made from plastic and includes a piston, a stem and an enlarged hand grip which are all molded integrally with one another so as to form a one-piece unit. The end of the cylinder is closed by a pair of separable caps which are adapted to be slipped sidewise onto the plunger and attached to the cylinder after the plunger has been assembled with the cylinder.

Abstract: A conventional pumping unit is mounted at ground level, to which is attached a hollow sucker rod that extends through a tubing string to the production level of the well. Integral with the tubing string is provided a pump barrel, with communication between the production formation and the tubing string being effected across a ball and seat check valve.Secured to the lower extremity of the hollow sucker rod is an elongated sleeve-like pump housing having a sealing element at the lower extremity thereof establishing a seal between the pump housing and the pump barrel. Intermediate the extremities of the hollow pump body is formed a plurality of elongated slot-like ports extending parallel with the longitudinal axis of the pump body. An elongated traveling piston is located for reciprocal movement within the pump body and is also provided with a seal at the lower extremity thereof for establishing a sealed relationship with the pump barrel.

Abstract: A material dispensing and metering piston pump comprising, in combination, a piston cylinder, an inlet defined in said cylinder for material to be dispensed, and an outlet defined in said cylinder for the said material, the inlet and the outlet being axially spaced from one another, and a piston comprising a piston rod and a piston head, the piston head comprising a member having a peripheral skirt outwardly and forwardly projecting therefrom, said member having one or more apertures extending there-through, there being a sealing member mounted on said piston rod, said member and said sealing member being movable relative to one another, said sealing member acting to seal said apertures when said member with said peripheral skirt and said sealing member are in one relative terminal position, the arrangement being such that the member and sealing member co-operate to seal said apertures when the piston head assembly moves material towards said outlet and to open said apertures when the piston head is withdrawn

Abstract: An improvement in liquid pumps having a piston with a packing surface which reciprocates in contact with a cylinder, comprising means for increasing the life of the packing by transmitting thereto a small portion of the liquid being pumped, for absorption thereby to cool and lubricate the frictional interface. The structure includes a groove in the piston head and an annular member of flexible material having inherent lubricity which continuously engages the cylinder, but is smaller in cross-section than the groove so that at each reversal of the piston a tortuous passage is briefly opened past the member through the groove.

Abstract: A master brake cylinder comprises a spring biased piston reciprocally mounted in a bore defined in a housing thereof. A cup seal, disposed in the bore to abut the piston, comprises a flexible annular flange portion having a plurality of circumferentially disposed grooves formed thereon to induce rotation of the cup seal upon the return stroke of the piston, subsequent to a braking operation. The cup seal is composed of a cured elastomeric material having a cup-shaped reinforcing fabric encapsulated therein.

Abstract: A metering pulse pump for metering an additive liquid into a liquid carrier under high pressure. A high-pressure, rapidly reciprocating piston pump is provided at its outlet end with a pressure-relief valve including a spring pressure control permitting the valve to open under varying pre-set pressure differentials across the valve. A diaphragm pump having first and second chambers separated by a diaphragm is provided with one of the chambers communicating directly with the outlet of the piston pump upstream of the pressure-relief valve, liquid carrier emitted under pressure from the piston pump serving to drive the diaphragm pump in a pumping stroke, the second chamber of the diaphragm pump having inflow and outflow ports with respective check valves permitting only inflow and outflow of an additive liquid into and out of the second chamber.