Abstract: A constant-speed, variable-volume, piston-type air pump. The piston head always is closely adjacent to the cylinder head at the completion of the compression stroke. The length or extent of the piston down-stroke or intake stroke is selectively adjustable between a maximum and a minimum position to thus vary the volume of air pumped.

Abstract: A combined constant-speed, variable-volume, piston-type air pump and peristalic pump. The air pump has a "minimum gap", i.e., has a piston head which is closely adjacent to the cylinder head at the completion of the compression stroke. The piston intake stroke is selectively adjustable between a maximum and a minimum position to thus vary the volume of air pumped. A motor means drives both pumps simultaneously. The peristalic pump comprises a pump housing mounted on a frame, having an inner circumferential track and a central opening. A rotor is positioned in said central opening, and has at least two rollers mounted thereon for rotation about axes parallel to said shaft axis. Flexible, compressible, hollow tube means is positioned between said rollers and said track.

Abstract: A peristalic pump includes a frame supporting a rotatable shaft on which is mounted a rotor having at least two rollers mounted thereon for rotation about axes parallel to the shaft axis. A pump housing surrounds the rotor and is formed by a pair of substantially identical body members positioned in facing, abutting relationship. Each body member has an annular portion with a flat axial end surface and an inner circumferential surface, as well as a tube guide and clamp tang portion integral with the annular portion and extending radially outwardly therefrom. Each tube guide and clamp tang portion has a pair of spaced-apart half-round grooves extending to the inner circumferential surface. Each member has a shoulder which extends radially inwardly from one axial end of the annular portion.

Abstract: An internal combustion engine comprises an engine head having at least one cylinder and a crank shaft. Each cylinder holds a piston for driving the crank shaft. At least one intake and one exhaust valve assembly is positioned adjacent each cylinder. Each intake and each exhaust valve assembly includes a valve with an opened position and a closed position. The valve opens a cylinder port in the opened position and seals the cylinder port in the closed position. A valve controller applies hydraulic signals to each valve assembly which actuate each valve between the opened and closed positions as a function of the piston position.

Abstract: An internal combustion engine comprises an engine head having at least one cylinder and a crank shaft. Each cylinder holds a piston for driving the crank shaft. At least one intake and one exhaust valve assembly is positioned adjacent each cylinder. Each intake and each exhaust valve assembly includes a valve with an opened position and a closed position. The valve opens a cylinder port in the opened position and seals the cylinder port in the closed position. A valve controller applies hydraulic signals to each valve assembly which actuate each valve between the opened and closed positions as a function of the piston position.

Abstract: Several embodiments of a well point are disclosed which include a resilient member that elongates each time an anvil surface near the conical tip of the well point is impacted by a drive rod. The drive rod is repeatedly raised and dropped to force the well point downwardly through the soil, pulling sections thereabove until the desired casing depth is reached.

Abstract: A detachable hydraulic coupler includes a male and female portion each including a valve which closes to prevent leakage when the coupler portions are detached. The valves do not directly contact each other when the coupler is closed, thereby simplifying the closing operation. The section of the female portion enclosing the male portion includes a series of locking balls slidable in apertures and which extend into a groove in the male portion to lock the coupler portions together. A slidable collar encircling the female portion normally holds the locking balls in locking position.

Abstract: A control circuit for a hydraulic cylinder and shaft assembly to regulate movement of the shaft relative to one end of the cylinder. The circuit has a fluid pressure supply and associated reservoir and a metering valve with interconnected normally closed passage means connected at one end to the one cylinder end and at an opposite end to the reservoir. The fluid pressure supply, in a first condition, supplies fluid under pressure to the one cylinder end, and, in a second condition supplies piloting fluid under pressure for actuating the metering valve to regulate the fluid flow from the one cylinder end to the reservoir through the normally closed passage means.

Abstract: An air cleaner is provided having an inlet and a concentric outlet passage. Means is provided for imparting a whirling motion to the air as the air enters the inlet. Provision is made for varying the size of the inlet so that the velocity of the air may be adjusted for different engine speeds. Turbine vanes are driven by the whirling air and drive blower vanes which assist centrifugal force in directing dust particles toward a particle outlet in the chamber wall.

Abstract: A shower head having a main body with a passageway extending therethrough and adapted to be connected to the end of a water supply pipe, an annular skirt attached to the outlet end of the body and a multi-apertured disk mounted on the body for breaking up the water flowing through the passageway into a series of high velocity jet sprays, said apertures so positioned as to direct the jet sprays downwardly in a relatively diverging pattern into engagement with the lower edge of the annular skirt to diffuse the sprays as they leave the shower head.