Abstract: A seal assembly for use in a cable cylinder to form an effective seal about a generally cylindrical cable section. The seal assembly includes first and second seal retaining member disposed on opposite sides of a seal element, all of which are disposed within a cylindrical bore of a gland member. The cylindrical bore includes a shoulder portion to retain one of the retaining members and a groove to retain the other for easy insertion and removal thereof.

Abstract: A piston for use in a hydraulic or other fluid operated device having sealing means intended to prevent the passage of working fluid between the piston and cylinder in which it moves consisting of the combination of at least one O ring or other sealing device arranged around the circumference of the piston and left and right hand intersecting helical channels formed over the length of the surface of the piston wall between the sealing device and the end of the piston subject to pressure of the working fluid. The helical channels act both to retain lubricating fluid and to provide a partial seal against the passage of working fluid between the piston and the cylinder, substantially complete sealing being effected by the sealing device.

Abstract: A bypass vavle arrangement extends fixedly from the end wall of a double acting cylinder through the radial wall of a booster piston with a sliding sealed fit to block bypass flow between the pressure chambers at opposed faces of the piston between desired limits of piston travel. Bypassing of such flow from one chamber to another effects a pressure drop from the pressurized chamber to the chamber being exhausted to limit the pressure driving force on the piston and thus effect a desired limit or extent of piston travel and of the connected steering mechanism. The invention provides for such bypass flow by means of flow passages spaced on opposite sides of a central valve body portion which passages are of a length to span the radial wall through which the valve body has passed when the piston has reached a certain point of its travel in either direction.

Abstract: An L-shaped seal, for a gun firing caseless ammunition, is captured in and to the chamber of the gun, and is preseated against the surface of the bolt by plastic deformation effected as the gun bolt is rammed into the chamber.

Abstract: A master cylinder in which the piston and push rod, connected with an open ball and socket arrangement, are retained in the master cylinder bore and held in the requisite inactive piston stop position by a retainer. The retainer is a generally U-shaped wire clip which extends through a pair of parallel through-bores in a plane perpendicular to the master cylinder bore axis. The through-bores are spaced apart sufficiently far to permit the retainer to receive the smaller rod portion of the push rod between the retainer legs. They also intersect the master cylinder bore chordally so that they are engaged by the push rod ball end when the master cylinder is released. An internal groove in the master cylinder bore adjacent the bore open end has chamfered side walls which prevent damage to the master cylinder seal lips when the master cylinder piston is assembled in the bore.

Abstract: A double-acting hydraulic cylinder unit imparts rocking movement to the walking beam of well pumping apparatus and has either (1) a stationary piston and a generally vertically reciprocating cylinder or (2) a stationary cylinder and a generally vertically reciprocating piston. Upper and lower piston rods of equal size extend from opposite sides of the piston and project through the upper and lower ends, respectively, of the cylinder. In one arrangement the lower end of the lower piston rod is pivotally anchored so as to pivotally absorb both compression and tension forces transmitted through the lower piston rod while the upper piston rod is not anchored and the primary function of the upper piston rod is to provide for equal displacement of fluid on opposite sides of the piston during vertical reciprocation of the piston.

Abstract: A radial type of fluid-pressure apparatus, such as a pump or motor, wherein a crankshaft is supported for rotation about its axis and has a crankpin radially spaced from its axis and connected with the inner end region of a piston which extends outwardly away from the crankshaft axis and which has an outer end region extending into a chamber of an outer housing structure which surrounds the crankshaft axis. This chamber communicates with a fluid passage. An inner circular housing structure is surrounded by the outer housing structure and surrounds the crankshaft while being formed with an opening through which the piston extends, this inner housing structure having a seat at its opening which surrounds the piston. The latter seat forms part of a sphere. The piston extends slidably through a sleeve which has an outer surface also forming part of the latter sphere and seated on this seat.

Abstract: An adjustable stroke length fluid cylinder used to move agricultural or industrial machinery is disclosed. The cylinder is an enclosed unit having a movable piston therein which is attached to an axial piston rod secured to the load. A fluid valve directs the application of pressure fluid to either side of the piston to extend or retract the piston rod. One end of the cylinder houses a head unit containing an internal valve which is operated by a stop member positioned on the piston rod. The internal valve is effective to stop retraction of the piston rod when actuated by the stop member by blocking fluid flow through the cylinder. Subsequent extension of the piston rod automatically returns the internal valve to its open position.

Abstract: An axially expandable and contractable cylinder and piston assembly is provided with an internal axially back and forth movable guide ring for the piston. Helical teeth or thread means at the outer periphery of the guide ring mesh with complementary helical teeth or thread means at the inner periphery of the piston, and helical teeth or thread means at the inner periphery of the guide ring are slanted oppositely to its outer helical teeth or thread means and mesh with complementary helical teeth or thread means on the cylinder.

Abstract: A high pressure, self-sealing and self-lubricating, reciprocating pump having a pair of uniformly thin wall, radially resilient, cylinders extending in parallel into adjacent cavities of a pump housing. Pistons, driven by a wobble plate and slidable in the cylinders, are of uniform diameter along their entire lengths of insertion in the cylinders on the compression stroke. The outer surfaces of the cylinders form annular spaces in the cavities which communicate with pressure chambers in a manifold operatively connected to the pump housing. Ball check valves within the manifold control the fluid flow at the inlet and outlet thereof. Bushings positioned around the cylinders intermediate the ends thereof provide resistance to skewing forces by the wobble plate. Pressure changes due to compression and suction in the pump causes the thin wall cylinder to collapse and expand about their respective pistons forming thereby a high pressure seal during compression, and a self-lubricating cylinder during suction.

Abstract: A gland seal arrangement for effecting a fluid seal between two relatively movable parts wherein the loading applied to an annular sealing member in contact with such parts is derived from a coaxially arranged, sleeve-like thrust member sensitive to the pressure of the fluid being sealed so that with increasing fluid pressure the loading applied to the sealing member is correspondingly increased.