Abstract: A fluid pump having a fluid inlet, a fluid outlet, a pumping chamber, inlet and outlet check valves, and a pumping device that draws fluid into the pumping chamber and pumps fluid from the pumping chamber. The pumping device includes a pair of springs, a solenoid actuator, and a pumping diaphragm. During the energization stroke of the actuator, the movable member thereof moves substantially independently of the pumping diaphragm. One of the springs (51) instead urges the pumping diaphragm area (50) to cause a suction head in the pumping chamber. Since the strongest force output of a solenoid actuator ordinarily occurs at the instant of energization, the majority of such force output can be converted to work for storage in the other spring (72) during such energization without having to rely on such solenoid actuator to effect suction. After the solenoid actuator is deenergized, the second spring (72) effects substantially constant pumping pressure on the fluid in the pumping chamber.

Abstract: A manually operated dispensing device for a container holding a quantity of liquid is disclosed. The device has an internal chamber and a flexible, elastomeric diaphragm-like cover on at least one side of the chamber in a component retaining body. Associated inlet and outlet valves, which valves may be discrete or integral with the diaphragm and body, and conduits are included whereby liquid from a supply thereof in the container is drawn up into the chamber when the diaphragm is flexed under stress. The diaphragm is operatively associated with a trigger device, the actuation of which flexes and stresses the diaphragm in a direction to decrease the chamber volume. Liquid which is present in the chamber is displaced and pressurized in a pumping action, forcing the outlet or discharge valve to open and the inlet valve to close allowing the liquid to flow into the outlet or discharge conduit and be dispensed from the device.

Abstract: A pump for pumping an incompressible liquid comprising a housing having an inlet and an outlet, a pumping chamber in said housing, and a positive displacement pumping member mounted for movement in the pumping chamber. The housing has an inlet passage which leads from the inlet to the pumping chamber and an outlet passage leading from the pumping chamber to the outlet. Inlet and outlet check valves are provided in the inlet and outlet passages, respectively. A resiliently expandable chamber opens into the inlet passage upstream of the inlet check valve to receive the liquid and to be resiliently expanded by it.

Abstract: This invention relates to a dispenser for paste-like products of the type having a container containing a product and closed at one end by a slidable piston in sealing engagement with the inner wall surface thereof, the other end being provided with a head member carrying on applicator and forming a pump chamber the volume of which is variable by the exertion of exterior pressure, the pump chamber being closed towards said container by a first check valve adapted to open only towards the pump chamber, and towards the outlet of the applicator by a second check valve adapted to open only towards said outlet.

Abstract: A dispensing pump of the pressure build-up variety includes a cylinder defining a variable volume pump chamber, and a main piston reciprocable therein, the piston having a valve seat thereon communicating with a discharge passage leading to a discharge nozzle. A valve member having a smaller diameter piston thereon is moved during pressure build-up away from the seat for opening the discharge passage. The smaller diameter piston has a flexible peripheral wall which is deformed inwardly at the commencement of the piston downstroke for closing a flow passage in the smaller diameter piston and thereby interrupting communication between the inlet and the pump chamber, such flow passage being open upon outward movement of such peripheral wall at the end of the piston upstroke. At the top of the cylinder along which the smaller diameter piston moves is a relieved section effecting the opening of the flow passage in an inoperative condition of the pump.

Abstract: A downhole pump has spaced upper and lower pistons connected together by a common rod so that the pistons reciprocate within a cylinder. The cylinder is separated into an upper and lower engine chamber by a frame supported from the cylinder wall and arranged laterally with respect to the longitudinal axial centerline of the connecting rod. A bushing is positioned centrally of the frame and sealingly engages a reciprocating marginal length of the connecting rod. An exhaust port is formed through the frame in spaced relationship to the bushing. A resilient exhaust valve element surrounds the bushing and includes a lower, circumferentially extending edge affixed to the frame outwardly of the exhaust port and further includes an upper seal end which sealingly engages a marginal external surface of the bushing.

Abstract: The inlet and discharge valves of a pump are each comprised of a circular valve plate centered in a circular cutout in a flat valve sheet. Diametrically opposed webs join the valve plate to the main body of the valve sheet and perforations in the webs provide both, spring action and allow for air passage.

Abstract: An atomizing pump assembly for use with a variety of types of containers is disclosed in which a housing is formed with both an outlet port and an internal fluid chamber that communicates via a passageway with the outlet port. Tubular means provides communication between the fluid chamber in the housing and a reservoir of the material that is to be dispensed by the pump. A flexible frustroconical skirt or diaphragm having a valved opening therethrough is operatively located intermediate the tubular means and both the fluid chamber and the outlet port, with an integral upper portion of the diaphragm initially obstructing the outlet port. When an actuating cap is depressed, material within the fluid chamber is compressed until a minimum predetermined chamber pressure is achieved, whereby under pressure the skirt or diaphragm is flexed from its normal position to a discharge position.

Abstract: A reciprocating type pump has a pair of body members with complementary concave and convex surfaces which clamp a flexible sheet means therebetween to hold the same in curved configuration. The member having the convex surface has a pump chamber opening toward the flexible sheet means and the concave member has inlet and outlet passages opening toward the flexible sheet. The flexible sheet has portions overlying such inlet and outlet passages and the overlying portions have free edge portions extending in the direction of curvature of the flexible sheet and adapted to be flexed toward said convex surface member by fluid pressure from said passages whereby the overlying portions of the flexible sheet are reversely curved under the force of said fluid pressure and return resiliently to original passage closing condition when such pressure is not acting thereagainst.