Abstract: An air compressor cylinder sleeve is formed from an extrusion having a central passage surrounded by a plurality of closed sided passages. Preferably, grooves are formed between adjacent ones of the closed sided passages. The extrusion is cut into individual cylinder sleeves which are mounted on compressor housings. The central passage receives a piston which is reciprocated by an eccentric on a motor shaft. The ends of the closed sided passages adjacent the housing open into the interior of the housing and the opposite ends of the passages open to atmosphere. A fan on the motor shaft causes air to flow through the compressor housing and through the closed sided passages to cool the cylinder sleeve.

Abstract: A pump and a method for pumping liquid or fluid through a pair of resilient tubes includes a pushing mechanism which partially compresses the tubes in a balanced, alternating, rocking manner. The resilient tubes are held in a parallel relationship. The pushing mechanism alternately compresses the tubes. As one of the two parallel tubes is compressed, fluid is pumped out of the tube and at the same time fluid is drawn into the second tube as the latter tube resumes its original shape. The resilience of both tubes also is used to assist the pumping action in a balanced fashion, thereby providing a pump that has low power consumption and is lightweight.

Abstract: A compressor has a refrigerant gas passage selectively connected to and disconnected from a refrigerant circuit separately provided from the compressor. The compressor has a plurality of pistons reciprocable in a housing for compressing refrigerant gas. A drive shaft is rotatably supported by the housing. A swash plate is supported on the drive shaft for integral rotation with inclining motion with respect to the drive shaft to drive the pistons. The swash plate is movable between a maximum inclined angle and a minimum inclined angle. A disconnecting member disconnects the refrigerant circuit from the refrigerant gas passage when the swash plate is at the minimum inclined angle. A bleed hole bleeds the refrigerant gas from the refrigerant gas passage to the refrigerant circuit to suppress rapid increase of the inclined angle when the disconnecting member operates.

Abstract: A curvilinear peristaltic pump for pumping liquids through a resilient tube. The pump includes a curved concave platen against which a resilient tube is placed. A multi lobed cam is positioned adjacent to the platen and tube. A plurality of pump fingers are mounted between the tube and cam in a manner permitting radial movement of the pump fingers. As the cam rotates, the fingers are pressed toward the tube sequentially so as to pump liquid through the tube. The lobe end presses the tube sufficiently to occlude the tube and prevent back flow without over pressing and damaging the tube. A transverse pinch finger is provided on each pump finger, extending from the tube pressing face of each pump finger. At the tube occluding position, the pump finger nearly occludes the tube and the pinch finger completes occlusion without pressing the tube beyond the fully occluded position. A fixed or slidable spring pressed pinch finger may be used.

Abstract: The invention relates to a hydraulic pumping unit for feeding the hydraulic tilting cylinder(s) of a vehicle having a tilting cab, having a housing (1), a displacement body mounted for movement in a pumping chamber within the housing (1), a control valve having a bore in connection with the pumping chamber and a control valve body (2) within the bore, the control valve body (2) being provided, at an end (3) projecting beyond said housing (1), with a handle by means of which the control valve body (2) may be turned between at least two positions operative to tilt the cab from the drive position and to tilt the cab back into the drive position of the vehicle respectively. In accordance with the invention, the handle has an inner part (A) that is fixedly connected with the control valve body, and an outer part (B) which encloses the inner part (A) in a free rotating manner and is mounted to be coupled with the inner part by means of a key-operated lock cylinder (24), the outer part (B) forming the handle.

Abstract: A blood pump used for heart-lung machines comprising an impeller, a casing having a suction inlet and a delivery outlet and rotatably encasing the impeller, a magnetic driver disposed outside the casing, and a magnetic attraction force adjuster. The impeller has a rotationally symmetric shape, such as a conical shape, is equipped with vanes having a pumping function on the side surface thereof and is also equipped with magnets, such as permanent magnets. The magnetic driver for rotating the impeller in cooperation with the magnets comprises a magnet assembly magnetically connected to the magnets and a rotation driver for rotating the magnet assembly. The magnetic attraction force adjuster adjusts the magnetic attraction force generated between the magnets and the magnet assembly by adjusting the gap between the magnets and the magnet assembly or by adjusting the exciting current of electromagnets when electromagnets are used for the magnet assembly.

Abstract: A pump for conveying flowable paste-like materials, including a conveyer line which has a plurality of conveyer elements sequentially arranged in the longitudinal direction of the conveyer line to selectively displace and release at least a part of the volume of material conveyed by the conveyer line. The pump possesses a working chamber consisting of an annular chamber externally bounded by a housing of the pump and interiorly by a cylinder. The conveyer elements incorporate bellows elements each in the form of a ring of an elastically extensible material acted upon by a pressure medium at a side opposite the material being conveyed, with the bellows elements being formed by a common hose-like bellows which is retained on an inner wall of the housing. A support ring is located between respectively each of the bellows elements for retaining the bellows on the inner wall, with pressure lines located between the support rings and passing through the housing to open into the annular chamber.

Abstract: A variable capacity swash plate type compressor adapted to being driven by a vehicle engine without the intervention of a solenoid clutch and having a drive shaft rotating about an axis of rotation thereof, a swash plate capable of nutating to cause reciprocatory suction and compression motions of pistons in cylinder bores and of pivoting about a pivoting axis thereof to change an angle of inclination thereof with respect to a plane perpendicular to the axis of the drive shaft, the swash plate being pivotable from a 0.degree. inclination position to a large inclination angle position by setting a product of inertia of the swash plate so that a moment is automatically generated to move the swash plate from the 0.degree. inclination position to a large inclination angle position in response to the slowest possible rotation of the swash plate.

Abstract: A holder for an IV tube roller clamp is removably secured in the housing of an electronic infusion device, and has in opposite ends thereof a pair of photo-electric devices, one of which detects when the roller of the clamp is in its tube opening position, and the other detects when the roller is in tube closing position. A lever is pivotal on the housing between a closed position in which it operatively connects the IV tube to a pump unit in the housing, and an open position in which it permits removal of the IV tube from the unit. The spring-loaded armature of a solenoid prevents the lever from being opened until the solenoid coil is energized, and the photo-electric devices prevent the solenoid coil from being energized until the roller is in its tube closing position. When closed, the lever overlies part of the tube channel in which the IV tube is seated and also shifts a pressure plate in the pump unit to a position in which a lip thereon overlies another portion of said channel.

Abstract: A pump displacement control for a variable displacement pump includes a torque control valve disposed between a variable torque limiter and a force applying device disposed in axial alignment within a common bore. A sleeve and a valve spool are movable relative to each other to establish a first condition communicating discharge pressure into an actuator chamber to move a swashplate toward a minimum displacement position against the bias of a spring or a second condition communicating the actuating chamber with an exhaust passage to allow the spring to move the swashplate toward its maximum displacement position. A torque control piston disposed between opposing springs resiliently bias the valve spool in a direction to establish the second condition when control fluid is directed into a control chamber.

Abstract: A unit comprising a drive motor and a radial piston pump is proposed, in which unit an armature of the drive motor and an eccentric of the radial piston pup are carried by a common unitary shaft which has three bearings. A three-bearing mounting, known from the prior art, for a shaft of this kind consists of three ball bearings, which are expensive. The invention proposes to replace the ball bearing situated at the greatest distance from the eccentric in the prior art by a slide bearing, and to design the latter as a sintered metal bearing and to impregnate it with a viscous lubricant. The unit according to the invention can be used as a component of an anti-lock device of a vehicle brake installation or of a drive-slip control device acting on driven wheels.

Abstract: A pump displacement control for a variable displacement pump includes a torque control valve serially disposed between a remotely controllable displacement control valve and a variable torque limiter in axial alignment within a common bore. A displacement control sleeve is disposed within the bore for normally controlling the fluid pressure in an actuating chamber of an actuator connected to a swashplate of the pump when the pump discharge pressure is below a predetermined high pressure. The torque control valve assumes control of pump displacement when the pump discharge pressure exceeds the predetermined high pressure and includes a sleeve and a valve spool movable relative to each other to establish a first condition communicating discharge pressure into the actuator chamber to move the swashplate toward a minimum displacement position or a second condition communicating the actuating chamber with an exhaust passage so that the swashplate is moved toward its maximum displacement position.

Abstract: A pulse dampener for fuel systems having a rotary fuel pump and a fuel flow passage. The pulse dampener includes a hollow torus-shaped body with a fluid disposed within the body and the hollow body defining two flat surfaces disposed in spaced parallel relation with respect to one another and perpendicular to the flow of fuel through the fuel system. The pulse dampener further includes a pair of sides disposed perpendicular to and interconnecting the spaced flat surfaces to define the torus shaped pulse dampener to dampen pressure pulses within the fuel.

Abstract: The invention relates to a hose pump with pushers (2) arranged one behind the other in the direction of extension of the hose (4), the edges (3) of which act in rhythmic alternation on the hose (4) and which are controlled by angularly staggered eccentric disks (7) which rotate about a common axis (x--x). In order to provide a structurally advantageous system, the common axis (x--x) is made up of stub shafts (8) which project on one side of an eccentric disk (7) and engage in corresponding recesses (9) in the adjacent eccentric disk (7).

Abstract: A medication delivery device having a reduced weight due to the configuration of the end terminal of the pleated bellows reservoir. The end terminal includes an indented portion which is sized such that when the reservoir is in the compressed/empty position there is substantially no separation between the indented portion and the base portion of the reservoir. This construction allows the reservoir to be almost completely emptied of medication when the reservoir is collapsed but does so in a manner which does not add to the weight of the device.

Abstract: A low-pollution external combustion piston engine is adapted to utilize any of a number of expansible gases and fuels, and to maximize power output relative to the weight of the engine. The engine has a highly efficient and compact rotary design featuring a multi-cylinder rotary block acting on a rotary torque conversion plate. The design includes porting and valving for controllably admitting pressurized gas at substantially equal pressures to both sides of each piston to drive each piston bidirectionally and thereby maximize power output and efficiency. Each piston chamber has both primary and secondary exhaust porting to minimize back pressure and thereby further aid power output and efficiency.

Abstract: A pump comprising a chamber and a transducer. The chamber receives a medium to be pumped. The chamber has first and second ends and an inlet and an outlet. The transducer is disposed at the first end of the chamber and provides an energy wave within the medium which imparts momentum to it whereby it passes through the outlet by the momentum.

Abstract: The present invention relates to a gas compressor which prevents noise being produced in the suction conduit during idling. In conventional systems, the noise results from the collision of arriving and returning gas by means of a check valve provided between the suction chamber and the suction conduit. The present invention avoids this noise by providing an additional chamber which is connected via an admixture valve to the compression chamber (20) during the idling operation. This invention is especially applicable to pneumatic systems in automotive technology.

Abstract: A hydrostatic piston machine having a housing comprising two shells of a part-cylindrical form, the shells connectable together along a parting-plane in which the central axes of the drive-shaft and cylinder-barrel lie. Each housing element is provided with a number of semi-circular formations and recesses which form pockets or apertures when the housing shells are connected together to provide support surfaces for the working elements of the machine. A cylinder-barrel mounted within a chamber formed between the shells and is provided with a number of cylinders each containing a piston. Fluid-passageways are provided in the housing to receive and supply fluid to the pistons of the machine.

Abstract: A progressive cavity pump is located in a well and driven by a downhole electrical motor. A connector locates between the drive shaft of the motor and the rotor of the pump. The connector includes a connector shaft which has a lower end restrained on a longitudinal axis. The upper end orbits with the lower end of the rotor. The connector shaft has splined ends that are received in couplings. The connector shaft flexes during the orbiting movement.