Abstract: The invention involves pressure-counterweighted oil-well pumping apparatus in which derrick structure of elemental simplicity involves components which are readily assembled and disassembled, such that a given pumping apparatus can be loaded on a single truck and transported from one to the next desired well-pumping location. For a given capacity pumping system, overall height requirements for the derrick structure are less than one half those of U.S. Pat. No. 4,631,918. And power-integrator complexity is substantially reduced by employment of a fixed-displacement variety in conjunction with a variable speed a-c motor as the prime mover, under control of solid-state devices and pressure-sensitive transducer elements which determine upper and lower limits of the reciprocating stroke.

Abstract: An installation includes at least one starting head and at least one green provided with a hole, a device for recovering balls from the green and in the vicinity of the green, and an arrangement for returning the balls to the starting head. The installation further includes an arrangement enabling the player to evaluate the precision of his strokes and measure his skill alone or with respect to other players.

Abstract: An apparatus for providing a gas phase film lubrication between a reciprocal piston and a cylinder of an uncooled oilless internal combustion engine; the piston is effective to drive a rotary crankshaft in response to an expanding gas charge. The apparatus comprises: (a) means connecting the crankshaft to said piston for transferring reciprocal thrust into rotary thrust, such means aligning the piston concentrically within the cylinder wall to limit the imposition of side loads on said piston (i.e., less than 80 psi); (b) interfacing walls on the piston and cylinder (i) sized to provide a predetermined annular gap therebetween at ambient conditions that has a radial dimension in the range of 0.001.+-.0.

Abstract: A disposable diaphragm pump cassette comprises a flexible diaphragm member comprising hinged, rigid plates hingingly mounted on an inflexible plate and opposed to a pumping chamber surface to form a pumping chamber. The pump includes check valve means comprising movable circular plates integrally connected with the inflexible plate by flexible, extendable webs. The flexible diaphragm member comprises at least three inflexible diaphragm plates with edges in a common plane, each diaphragm plate having at least two straight diaphragm plate hinge edges. Each diaphragm plate hinge edge is adjacent to and aligned with a second diaphragm plate hinge edge of an adjacent diaphragm plate. The adjacent edges of each diaphragm plate hinge edge and second diaphragm plate hinge edge are attached together by a flexible hinge strip.

Abstract: A vacuum-operated brake booster comprises an axially movable power piston and a plunger axially movable in a cavity of the power piston. A valve disposed within the cavity cooperates with seats on the plunger and power piston to regulate pressure in a variable pressure chamber. A key serves as a stop to limit travel of the power piston and plunger. The key includes a base portion and a pair of parallel legs which extend into a radial hole of the power piston. The legs straddle and press against the plunger. Elastic retainers are snap-fit onto the ends of the key member. The elastic retainers are wider than the radial hole to retain the key in the hole.

Abstract: The present invention relates to a thrust force reduction device for torque converter comprising a pump rotor, a turbine rotor connected to a turbine shaft and disposed opposed to the pump rotor and at least one stator rotor and a fixed cylindrical shaft fitted to a boss of the pump rotor; characterized by that a seal element is fixed to the turbine shaft and produces a thrust reactional force so as to cancel a thrust force which occurs in the torque converter; the seal element facing a fluid chamber receiving pressurized hydraulic fluid exhausted from the turbine rotor, and the seal element being disposed liquid tight between the turbine shaft and a power input guide to the turbine from the engine, to which the turbine is connected.

Abstract: A hydraulic booster equipped with an emergency accumulator, wherein reaction and power pistons are slidably fitted in a housing such that the two pistons define a power chamber therebetween. The booster includes a control valve having a normally closed power chamber passage formed therethrough so as to communicate with the power chamber, and a normally open passage connecting a pump and a reservoir. The valve is operated in response to an operation of the reaction piston, so as to restrict a fluid flow through the normally open passage from the pump toward the reservoir, thereby raising a pressure of the fluid delivered from the pump, and open the power chamber passage to apply the raised pressure to the power chamber. A pressure reducing device is provided in the power chamber passage, for reducing a fluid pressure in the power chamber passage and applying the reduced pressure to the power chamber, at least while a rate of fluid flow through the power chamber passage is higher than a preset limit.

Abstract: Improved lubricant control assemblies are disclosed for reciprocating piston rods of an engine which prevent crankcase lubricant intruding into the cylinders and fluid from the cylinders from escaping into the crankcase. Each assembly comprises a tubular sleeve fitting closely onto a piston rod and yieldably mounted within the bore between cylinder and crankcase through which the piston rod extends. The sleeve is urged into forceful contact around the piston rod by a plurality of disk members which forcefully urge the sleeve in contact around the piston and for controlling lubrication.

Abstract: A fluid actuator including at least two cylinders connected to a common pressurized-fluid supply mechanism. Actuation units are connected to piston rods of the cylinders, respectively. The piston of one of the cylinders is operated by pressurized fluid, and when the piston is moved back, the pressure in the cylinder is increased to operate the piston of the other cylinder. The actuation units are thus operated with a certain amount of interval of time or in a synchronous mode.

Abstract: A vacuum breaking-force booster has a sequential control valve without a response path. First and second pressure chambers are separated by a diaphragm with a diaphragm disk in it and the diaphragm disk is connected with a shaft that supports a radially inward valve seat which presses against a spring biased sealing disk. Communication between the first and second chambers is past the inner valve seat. A shiftable sleeve extends through the lid of the first of the chambers and includes a collar which engages the inside of the lid for determining the maximum extend the sleeve can move out of the lid. A pressure piston extends through the sleeve. A bridge connects the sleeve with the pressure piston for moving together. An elastomeric bellows attaches the sealing disk to the sleeves and the pressure piston; the outer valve seat is defined on the sleeve for engaging the sealing disk. A spring normally urges the sealing disk toward both of the valve seats.

Abstract: A system reduces force fight between hydraulic actuators (22, 24) operated on independent hydraulic circuits (29, 49) which position a control surface (20) of an aircraft. Each circuit includes a hydraulic supply (30, 50). A pressure equalization valve (70) is connected to first sides (42, 62) of the actuators. In the event of a pressure imbalance, a spool (82) shifts in the pressure equalization valve. Movement of the spool enables fluid from the circuit supply to be delivered through the equalization valve to the actuator at the lower pressure, rapidly eliminating the imbalance.

Abstract: Each of the head assemblies of a rotary actuator includes a tapered roller bearing in which the shaft of the actuator is journaled and an end plate against the inner face of which the stator and movable vanes of the actuator are sealed by a resilient jacket. A pressure equalizing passageway extends through each end plate from the cavity in which the associated roller bearing is mounted to the gasket which seals the stator to the end plate, thereby to equalize the pressure across the end plate and reduce the torque required to initially rotate the actuator shaft.

Abstract: A pressostat comprises an operating pressure chamber (4) which is limited by its housing (1) and by an operating membrane (5) or the like including a pressure surface for an output adjustment member (3), at least one spring counteracting the pressure (P) in the operating pressure chamber (4), a switch member (2) which responds when a limit pressure value is exceeded in said working pressure chamber (4), and an enclosed protective chamber (6) arranged concentrically to the working pressure chamber (4) limited by the housing (1), the operating membrane (5) and a protective membrane (7) or the like including pressure surface for the output adjustment member (3).

Abstract: A booster device for reducing the pedal force required to release the clutch on automotive vehicles. It is capable of either replacing the conventional clutch master cylinder (FIG. 4) or acting as an additional slave and master cylinder (FIGS. 1 to 3). An overcenter mechanism acts on the piston 4 intermediate its end to assist movement in opposite directions beyond a central point. To avoid unbalanced side loads, the overcenter mechanism includes two radially opposed spring (8) biased arms (5) the inner ends of which bear in cup-shaped recesses (6A) on opposite sides of a plug (6) sliding in a transverse bore through the piston (4).

Abstract: A percussive tool comprising a housing (1) accommodating a movable striker (2) and connected with a power cylinder (6) in which is arranged a striker shank (4) with a gripping mechanism (14) and a drive in the form of a hydraulic cylinder (8). The percussive tool is provided with a control unit having a spool valve means (18) to control a distribution means (19). The spool valve means (18) has a casing (22) and a spool (23) taking two positions in the casing and defining two chambers (25, 26) interconnected through a throttling means (24). One chamber (25) constantly communicates with a discharge line (21), and the other chamber (26) is periodically put in communication with the space of the hydraulic cylinder (8). The spool (23) is spring-loaded with respect to the casing (22) on the side of one chamber (25) and takes in this case its first position.

Abstract: Herein disclosed is a slide type exhaust brake system. In this system, a plate valve member having an exhaust pressure regulating port extending through its surface is fitted in an exhaust brake body housing having a valve member reciprocation passage extending generally at a right angle from and communicating with an exhaust flow passage having exhaust pipe joint walls projecting at its two side end portions.

Abstract: A power steering control valve includes relatively rotatable inner and outer valve members. A power steering resistance control system resists relative rotation between the inner and outer valve members with a force which varies as a function of variations in vehicle speed. The power steering resistance control system includes a force transmitting member which is disposed adjacent to one end of an outer valve member. A spring force is applied against the force transmitting member urging it in a first direction along the axis of rotation of the valve members. Fluid pressure is applied against the opposite side of the force transmitting member to urge it in the opposite direction along the axis of rotation of the valve members. A speed responsive control unit, connected with a fluid return conduit for the power steering valve, is operable to vary the fluid pressure applied against the force transmitting member as a function of variations in vehicle speed.

Abstract: A bidirectional flow communication passageway is provided by the present invention in a multiple-circuit fluid pressure responsive system on a motor vehicle to allow a gradual reduction of pressure in a parking brake circuit which is a part of such system. The passageway is restricted to limit such bidirectional flow to a predetermined level. The pressure reduction permitted is sufficient to activate a parking brake valve in such parking brake circuit when a defect occurs in an operating service brake circuit which is also a part of such system.

Abstract: A bidirectional flow communication passageway is provided by the present invention in a multiple-circuit fluid pressure responsive system on a motor vehicle to allow a gradual reduction of pressure in a parking brake circuit which is a part of such system. The passageway is restricted to limit such bidirectional flow to a predetermined level. The pressure reduction permitted is sufficient to activate a parking brake valve in such parking brake circuit when a defect occurs in an operating service brake circuit which is also a part of such system.

Abstract: An electronic tractor hitch control system in which the position of an implement hitch relative to a tractor can be set using a main control operable by a tractor operator from his normal location on the tractor and can also be set using a secondary control located at a location remote from the normal operator's location, such as on the rear of the tractor fenders. The system is arranged so that any implement position signal set using the secondary control is opposed by a smaller hitch positioning signal generated within the system so that the speed of movement of the hitch in response to hitch positions set using the secondary control is moderated. The system also includes circuitry for detecting short circuits in parts of the system located in vulnerable locations.