Abstract: Disclosed is a mixing and dispensing system including a tubular housing with an inlet opening for receiving a first liquid ingredient and a tubular casing for retaining a second liquid ingredient to be combined therewith. A piston is longitudinally movable in the tubular casing to force the second liquid through an outlet opening that liquid tightly engages the inlet opening of the tubular housing. Extending through an end of the tubular housing opposite to the inlet opening is a rod having an inner end secured to a seal mechanism for contacting the inlet to liquid tightly seal the inlet opening. The rod also extends through and is longitudinally movable within a passage in a plunger having an outer periphery conforming to the inner walls of the tubular housing. A coupling mechanism is operable to selectively secure the plunger to the rod so as to provide common longitudinal movement thereof.

Abstract: An improved swabbing cup construction for use on the mandrel of a swabbing tool for clearing liquids and particulate matter, and initiating the flow of oil, from an oil well pipe. The improved cup construction is manually adjustable on the mandrel to compensate for wear of the cup to greatly increase the life of the cup and to substantially facilitate the swabbing procedure for an oil well pipe. The method comprises the steps of observing the wear of the swabbing cup and of manually increasing the outer diameter of the swabbing cup while it is on the mandrel and during swabbing operations of said oil well pipe.

Abstract: A hydraulic actuator cylinder primarily for the actuation of aircraft landing gear in which the rod end is made integral with the piston rod with the attaching threads positioned inside the cylinder. The piston head is designed to float on the piston rod plus or minus the amount of adverse tolerance conditions that are possible in the landing gear installation.

Abstract: A cylinder assembly with split ring retainer having a hollow cylinder and a piston slidable therein and a rod extending from the cylinder. A cylinder head is attached to one end of the cylinder and surrounds the rod for supporting the rod. A split ring is disposed adjacent the piston and the cylinder head for respectively holding the piston onto the rod and for holding the cylinder head at its location with the end of the cylinder. The split ring and its cooperating adjacent part have inter-engaged tongue and groove inter-engagements for holding them together, and there is a member, such as a snap ring, for holding the split ring radially inwardly and against the part to which it is attached.

Abstract: A compressor of a Scotch-yoke type, which includes: a piston consisting of a pair of bottomed cylindrical members, with the open ends of the members being mated with each other; a slider confined between the opposed bottoms of the piston, and slidable along the inner surfaces thereof in the direction perpendicular to the axis of the piston; and a crank cam secured to a drive shaft extending through opposed openings defined in the wall of piston, i.e., in a mated portion of the cylindrical members, and fitted in a bore provided in the slider rotatably. In this compressor, the aforesaid mated portion of the bottomed cylindrical members are further provided with opposed openings or windows in the direction of the reciprocating or sliding slider, so that parts of flanks of the slider may go into the aforesaid windows, thereby increasing a stroke of the piston.

Abstract: A piston of a hydraulic actuator is threaded on one end of a piston rod and is prevented from becoming unthreaded therefrom by means of a radially extending key received in a keyway formed by cooperating recesses in the ends of the piston and piston rod. A threaded fastener extends axially into the piston rod and holds the key in place.

Abstract: A fluid operated linear motor of the piston and cylinder type. The piston is secured to a rod by a threaded connection and the mating threads are proportioned and dimensioned so that pivotal movement available in the threaded connection is enough to compensate at least in part for manufacturing tolerances and eccentricities and prevent or reduce abnormal distribution of lateral forces by the piston on the outer cylinder.

Abstract: A light weight piston assembly including a piston body formed of a light-weight metal and having a crown and a depending skirt, an annular recess about the end of the body adjacent the crown and opening toward the crown, the portion of the recess immediately adjacent the crown being threaded, a hard metal ring groove protection band having a peripheral, radially outwardly opening ring receiving groove disposed in the recess, at least one annular wavy spring in the recess, and a nut threaded on the threaded portion securing the band and the spring within the recess such that the spring is compressed to store energy to tightly hold the band against movement relative to the body during various piston operating conditions.

Abstract: An improved fluid cylinder including a housing defining a cylinder bore and having aligned piston rod openings at opposite ends thereof, which openings are nominally coaxial with the bore. A piston rod is within the bore and extends through both of the openings and a piston is located within the bore and includes a central opening receiving the rod and having a shape complementary to that of the rod while being slightly larger than the rod so that the piston may move radially on the rod. Securing elements are provided for fixing the axial position of the piston on the rod and include an annular shoulder abutted by the piston. A seal is interposed between the piston and the shoulder to preclude leakage of the working fluid therebetween. The relative radial movement of the piston on the rod compensates for lack of precise concentricity of the bore with respect to the rod receiving openings.

Abstract: A seal assembly utilizing a floating seat principle in a fluid powered rotary actuator to seal the arcuate surfaces and the planar ends of the actuator. The seal incorporates a two piece retainer design with a peripheral O-ring and cap ring combining with a captured O-ring and shoulder bolt which give the additional sealing and floating principle to assure effective sealing of the pressure chambers.

Abstract: A piston ring having a general shape of a cylinder with the first section in the shape of an annulus for engaging a portion of the surface of a piston to provide a fluid-tight seal with the piston and a second section in the shape of a thin-walled bowl with sealing means on the outer surface of the bowl for providing a fluid-tight seal between the ring and the cylinder wall. The ring is especially constructed for use at cryogenic temperatures of -320.degree. F and below.

Abstract: A threaded cap screwed into the piston head with a sealed joint to a sleeve tube open and flanged at the other end are provided to encase the clamping screws that fasten the piston head and the upper piston body member and lower piston body member together. The casing thus formed shields the screws from possibly corrosive coolant that under operating conditions could work through the joints between the parts of a composite piston in spite of the clamping pressure of the screws. Each screw is screwed into the threaded cap at the piston head end and its head or a nut bears on the flange of the sleeve tube at the other end. The screws and their protective casings fit within bores in an annular strut forming a large part of the upper piston body member that butts against a low annular ridge on the underside of the piston head into which the end caps of the screw casings are screwed.

Abstract: A wheel cylinder piston made of powdered metal is provided with a through hole and a steel or powdered metal insert of hard metal received in and fills the hole. The hardened insert acts directly against a tang of the brake shoe, eliminating the need for reaction pins. The piston of the assembly is made in a die set having a through rod to define the hole, the piston green preform being sintered and sized before or after the insert is in place.

Abstract: A fluid cylinder, piston and rod assembly where the cylinder is equipped with mounting means and the piston and rod are slidably carried in the cylinder. The piston rod is attached to the piston by means of a segmented locking ring engaging a groove at the piston end of the rod. The locking ring is fastened to the piston by means of a plurality of fasteners.The piston is equipped with peripheral wear inserts and hydraulic fluid seal means.

Abstract: A bolt-on piston assembly wherein two piston pieces are clamped onto the rod which has an integral radial projection thereon for axially restricting the piston pieces disposed on axially opposite sides of the projection. A plurality of bolts extend into the pieces for releasably clamping the pieces relative to the radial projecting portion of the rod.

Abstract: A piston ring having a general shape of a cylinder with the first section in the shape of an annulus for engaging a portion of the surface of a piston to provide a fluid-tight seal with the piston and a second section in the shape of a thin-walled bowl with sealing means on the outer surface of the bowl for providing a fluid-tight seal between the ring and the cylinder wall. The ring is especially constructed for use at cryogenic temperatures of -320.degree. F and below.BACKGROUND OF THE INVENTION1. Field of the Invention.The present invention pertains to an improved piston ring for use in reciprocating pumps, compressors, expansion engines and the like. In particular, the present invention relates to a piston ring for use with a device for producing a cryogenic refrigeration such as shown in U.S. Pat. No. 3,620,029. Cryogenic refrigeration generally relates to temperatures at minus 150.degree. F down to minus 450.degree. F.2. Description of the Prior Art.U.S. Pat. No.

Abstract: An oscillating fluid-driven actuator for a shaft, such as a ship rudder shaft, a butterfly valve spindle or the like. The actuator comprises (i) a stationary actuator housing defining an annular chamber coaxial with the shaft and having a suitable cross section, and (ii) an annular piston arranged coaxially with the shaft in the chamber and connected fixedly with the shaft by means of an arm mounted intermediate the ends of the annular piston by means of a central piston hub. The piston hub is made with a coaxial bearing surface or surfaces of convex spherical shape and the actuator housing has a central lower hollow hub defining an inner concave spherical bearing surface to support the piston hub by engagement with the spherical surface thereof. A corresponding concave spherical bearing surface is arranged in the upper portion of the housing to cooperate with the corresponding spherical surface of the upper portion of the hub.

Abstract: A fluid pressure operated actuator has a cylinder with a removable end cap and a piston rod extending axially through the end cap for transmitting piston movement to an external load and also has an internal compressed spring biasing the piston rod towards a predetermined position. To prevent violent expulsion of elements by the compressed spring upon removal of the end cap, stop means are provided on the piston rod to limit relaxation of the spring prior to the time that the end cap is fully removed from the cylinder.

Abstract: A piston and rod assembly wherein the rod has a pair of axially spaced grooves and the piston includes recesses disposed in opposite faces. One of the grooves is radially larger than the other and locking members are disposed in the grooves of the rod and extend into the recesses. A retaining means including a snap ring and an annular ring which is L-shaped in cross section are disposed radially outwardly of the locking members in the first recess for removably retaining the locking members in the first recess. A pair of threaded screws may also threadedly interconnect the retaining ring and the piston.

Abstract: The piston is formed with a piston head and a sleeve, fitted together such that the piston head has an outer end diameter matching the diameter of the cylinder, and then is formed with an offset inwardly extending shoulder, against which the piston sleeve can bear, to permit machining of the inner face of the piston head to form a bearing cup for a spherical head of a piston rod, and then assembly of the piston sleeve to bear against the abutment; drain line and oil connection lines may be formed in the piston to lead lubricating oil to the bearing cup. The piston head and sleeve can be connected by adhesives and, if necessary, tangentially located transverse pins.