Abstract: A hand-operated, portable, easily-manufactured liquid pump offering efficiency through advanced plunger design, ease of repairability, and enhanced versatility through use of a select group of inlet and outlet accessories. The pump preferably includes a cylindrical housing, a bottom end forming an inlet port, and a top end with an exhaust port located near the top end. A field-repairable plunger assembly having a plunger which is preferably a rubber diaphragm is located within the cylindrical housing and is connected to a rod and handle for reciprocating the plunger within the housing. A unidirectional flow device is operatively connected to the bottom end of the housing to allow fluids to flow in a direction from the inlet port toward the exhaust port while preventing fluid flow in the opposite direction. The pump may be constructed to allow disassembly from the bottom end or the top end to allow a user to service the pump in the field and to replace worn or failing components.

Abstract: A reciprocal type of pump structure wherein a piston has a linear function actuated by a pair of coils energized alternately and includes a plurality of tapered flutes. A check valve in an outlet of the structure which stretches to open said outlet under the impact of expelled fluids and of its own volition retracts to the closed position immediately upon the cessation of fluids being expelled.

Abstract: A movable magnet type pump, wherein a magnet moving body having at least one axially magnetized permanent magnet and an axially extending through liquid passage is arranged so as to be slidable inside a liquid introducing chamber; a plurality of coils are fixed so as to enclose the liquid introducing chamber; a first check valve is arranged on a liquid introducing side of the liquid introducing chamber; a second check valve is arranged on a liquid discharge side of the through liquid passage; and the magnet moving body is caused to reciprocate by interaction between current applied to the respective coils and magnetic flux from the magnet moving body cutting across the respective coils.

Abstract: A force limiter for limiting the force with which two articles come into contact with each other, which force limiter comprises a control member (11) displaceable with respect to a holder (5), which member is pneumatically prestressed with a force which is substantially independent of the relative position between the holder (5) and the control member (11). The force limiter can be used in devices in which, after stopping a drive the contact force between the driven first article and the second article in contact therewith mustnot exceed a given threshold value. More particularly the use in ultrasonic deformation devices is considered.

Abstract: A pneumatic vibrator is disclosed including a tubular housing having closed ends, an inlet port in the housing through which a fluid, such as air can flow into the housing, and a free-floating piston in the housing having two passageways through which the pressurized air entering the housing through the inlet port flows to act alternately against opposite ends of the piston and cause the piston to reciprocate in the housing. Exhaust ports are located in the housing through which the air ahead of the moving piston is exhausted from the housing. A plurality of relatively small openings is located in the housing through which pressurized air can flow into the housing and provide a fluid bearing between the piston and the housing, and means are provided to supply the inlet port opening with air under pressure.

Abstract: A force limiter for limiting the force between two articles getting into contact with each other, which force limiter comprises a control member (11) displaceable with respect to a holder (5), which member is pneumatically pre-stressed with a force which is substantially independent of the relative position between the holder (5) and the control member (11). The force limiter can be used in devices, in which after stopping a drive the contact force between the driven first article and the second article in contact therewith must not exceed a given threshold value. More particularly the use in ultrasonic deformation devices is considered.

Abstract: A variable capacity swash plate type refrigerant compressor having a plurality of pistons each including a cylindrical hollow main body reciprocated in a cylinder bore of a cylinder block, and an engaging portion engaged with a swash plate. The cylindrical hollow main body of the piston is provided with at least one first through-bore for providing a communication between the interior of the main body and the cylinder bore, and at least one second through-bore for providing a communication between the interior of the piston main body and a crank chamber of the compressor to thus enable the piston to have a thin and light weight wall construction, and to have a sufficient durability against large pressure changes applied to the piston.

Abstract: The invention concerns a tilt correction system with at least one pair of cylinder and piston assemblies which are hydraulically operated. The extent of tilt correction is limited by grooves internal to the cylinders of the assemblies which short hydraulic potentials once the pistons of the assemblies have moved from a rest position to a position adjacent the grooves. A preferable arrangement includes connecting each assembly between an anti-roll bar and an axle.

Abstract: The device for the compression of a gas comprises a motor (1), a piston (2) adapted to be displaced linearly in a pump body, transmission means (T) between the motor (1) and the piston (2) adapted to convert the rotary motion generated by the motor (1) into a reciprocating translatory motion by the piston (2). Speed varying means comprising a cam (12) are provided to impart a different speed to the piston (2) of the compressor according to the resistance opposing the motor (1) during one complete admission/compression cycle, so that the resisting torque is substantially constant and so that the motor (1) operates at its maximum torque and therefore at maximum efficiency. The section of the cam (12) is determined so as to ensure substantially isothermal compression of the gas.

Abstract: A pumping system for oil production comprises a hydraulic unit set on the ground and adapted to send out a pressure oil, and a pump unit set in an oil well and adapted to draw up crude oil therefrom. The pump unit comprises a pump cylinder, and a plunger reciprocatingly moved in the pump cylinder. The plunger is provided with a clearance formed between the outer circumferential surface of a lower end portion thereof and the inner circumferential surface of the pump cylinder. The pressure oil supplied from the hydraulic unit is ejected from the clearance along the inner surface of the pump cylinder into a cylinder chamber.

Abstract: A pumping system for oil production comprises a hydraulic unit set on the ground and adapted to send out a pressure oil, and a pump unit set in an oil well and adapted to draw up crude oil therefrom. The pump unit comprises a pump cylinder, and a plunger reciprocatingly moved in the pump cylinder. The plunger is provided with a clearance formed between the outer circumferential surface of a lower end portion thereof and the inner circumferential surface of the pump cylinder. The pressure oil supplied from the hydraulic unit is ejected from the clearance along the inner surface of the pump cylinder into a cylinder chamber.

Abstract: A cylinder structure and method for rapidly evacuating a cylinder without contamination thereof. The structure comprises a hollow cylinder, a piston mounted in the cylinder for axial reciprocation, a hollow piston rod secured to the piston for movement therewith extending out of one end of the cylinder, a seal between the one end of the cylinder and the piston rod, and a radial opening through the hollow piston rod between the piston and seal for evacuating the space between the cylinder, piston, piston rod and seal during reciprocation of the piston within the cylinder. The method includes the step of evacuating the space between the cylinder, piston, piston rod and seal through the piston rod during reciprocation of the piston within the cylinder.

Abstract: An actuator mechanism for detecting the presence of the piston or other movable element of a fluid cylinder for reversing switch purposes and the like is disposed in the end cap of the cylinder and is engaged by the cushion spear on the piston to provide transverse linear motion for actuation of a microswitch. The mechanism consists of a slender rod supported for movement transverse to the motion of the piston, the rod having a shoe at its lower end which receives a plunger, the latter passing through a bore in the end cap and adapted to be cammed upwardly by engagement with the cushion spear. The shoe and plunger are spring-biased toward the piston and the upward movement against the bias serves to actuate a microswitch external of the end cap to signal the presence of the piston. In a design suitable for different size cylinders, the plunger is formed of square stock of appropriate length.

Abstract: A master cylinder for actuating a hydraulic cylinder for a hydraulic brake or clutch. The master cylinder includes a cylinder body having a cylinder bore defined therein. The cylinder bore is in communication with an oil tank by way of a supply port and a relief port formed through the wall of the cylinder bore in axially spaced relation from each other. A piston is slidably received in the cylinder bore to define a hydraulic chamber forwardly thereof and comprises a pair of forward and rear piston portions axially spaced apart from each other with an annular seal member disposed therebetween. A cup support is integrally formed with the forward piston portion forwardly thereof and has a radially outer peripheral surface facing the inner peripheral surface of the cylinder bore with an annular clearance formed therebetween.