Abstract: A hydraulic coupler has two halves connected together and identical bores in the halves which together promote laminar flow through the coupler. After entering the poppet in one half, flow through the coupler is directed to an enlarged flow section, through the central portion of the coupler to the enlarged flow section in the other half and then through crossbores in the poppet in the other half and out through that poppet. The flow section of each half is between a seating section and an outward section, and the seating section has a cylindrical portion with a diameter which is equal to the diameter of the outward section.

Abstract: A hydraulic fluid reservoir contains an extensible bladder which has its exterior exposed to the fluid and its interior vented to the exterior of the reservoir. The interior of the bladder is sealed from the hydraulic fluid in the reservoir. Depletion of the fluid from the reservoir results in distension of the bladder and replenishing the fluid to the reservoir collapses the bladder. The bladder is pleated and a tie-rod which holds the reservoir together extends through the bladder.

Abstract: Inclusions in a liquid flow, such as air bubbles in a blood flow, are detected by transmitting a signal through the fluid and receiving and interpreting the received signal based on the expected degree of attenuation for the liquid and the inclusions. The amplitude of the transmitted signal is automatically adjusted to maintain a constant average amplitude of the detected signal, thus compensating for changes in the detection environment. The average amplitude of the transmitted signal is controlled by integrating the received signal using an integrator with a time constant longer than the time constant of the expected inclusion signals, and comparing the integrated signal to a constant reference level.The presence of microbubbles is detected and a signal comprising a string of high frequency pulses is generated while the microbubbles are present.

Abstract: A retainer for the drive shaft of a hydraulic torque wrench has an eccentric pivotably connected to the free end of the shaft which can be pivoted between an unlocked position and one or more locked positions and locked in any of the positions with a plunger. In the unlocked position, the eccentric does not overlap a bearing of the wrench so that the shaft and eccentric can be withdrawn axially from the wrench drive head. In the locked position(s), the eccentric overlaps and abuts an axial face of the bearing so that the eccentric cannot be drawn into the bearing, thereby securing the shaft against axial movement out of the wrench drive head in the direction from the eccentric toward the bearing.

Abstract: A modular valve has a valve housing which defines a manifold interface having a normally open port, a normally closed port and a common port. A manifold block is mounted to the valve housing with its valve interface sealed against the manifold interface. The valve interface of the manifold block has first, second and third valve ports which lead to respective first, second and third mounting ports at a mounting interface of the manifold block. The first, second and third valve ports and the normally open normally closed and common ports are arranged to communicate with one another in either of two angularly spaced positions of the valve housing relative to the manifold block. In one position, the first valve port comunicates with the normally open port, the second valve port communicates with the normally closed port, and the third valve port communicates with the common port.

Abstract: A powered work clamping device including a housing with an upper and lower chamber and an intermediate chamber communicating with the upper and lower chambers, an upper and lower piston respectively residing in the upper and lower chambers, and wherein the lower piston has a section with reduced diameter slidably and rotatably operating in the intermediate chamber, an index rod projects from the lower piston into an index bore in the upper piston and a piston rod connected thereto. The piston rod projects from the housing and is secured to a work-engaging head. The head is rotatable and independently extendable depending upon operation of the upper and lower pistons and means for rotating the lower piston and actuated upon operation of a check valve served by one of two independently actuated two-stage directional control valves.

Abstract: A powered work clamping device includes a housing having an upper chamber and a lower chamber, and a piston in the lower chamber connected to an index rod which projects into the upper chamber. The index rod is axially movable but not rotatably movable, and is biased to an upper position. A plunger extends from the housing and has a work engaging member at one end with a piston at its other end disposed within the upper chamber. The plunger is mounted on the index rod for axial and rotative movement, and is biased to a retracted clamped position. To unclamp a workpiece, hydraulic fluid is directed to a valve assembly within the device which sequentially delivers fluid first to the upper chamber to extend the plunger and then to the lower chamber to axially move the index rod and its piston to swing the plunger.

Abstract: A fluid operated hydraulic pump of the type using air pressure to produce high pressure hydraulic fluid wherein an air pressure driven motor and a hydraulic pump are positioned in adjacent axially aligned relationship and the air motor includes a reciprocating piston which drives the hydraulic pump. The air motor includes an exhaust passage having an expansion chamber therein for receiving exhaust air flow and including a plurality of baffles therein, the expansion chamber and the baffles functioning in combination to reduce the noise generated by the air motor without the use of other muffling material thereby avoiding undue back pressure in the air motor and increasing the speed and efficiency and operation of the air motor and the pump.

Abstract: A fluid operated hydraulic pump of the type using air pressure to produce high pressure hydraulic fluid wherein an air pressure driven motor and a hydraulic pump are positioned in adjacent axially aligned relationship and the air motor drives the hydraulic pump, the air motor including a reciprocable check valve for preventing air flow into the pump during the exhaust stroke of the pump thereby increasing the efficiency of the pump and reducing air flow through the pump. The check valve is disposed in the air inlet passage and is positioned in axially aligned relationship and adjacent to a reciprocable shuttle valve controlling exhaust air flow from the motor. Movement of the shuttle valve to a position permitting air to be exhausted from the air motor chamber also facilitates movement of the reciprocable check valve to a position wherein it prevents air flow into the motor.

Abstract: A cable bender apparatus for bending cables, for example of the type having thermoplastic insulation around copper or aluminum strands. The apparatus is connected to a cable for bending the latter to any desired degree and is actuated by, for example, a single acting fluid cylinder. The bending shoe is adjustable on a bending yoke so as to accommodate cable of different diameters and will not inadvertently become disassembled upon relaxation of the bending pressure. The bending saddle swings as the cable is being bent and the arrangement is such that the saddle remains perpendicular to the cable and will not cause the insulation to be ruined as the saddle slides slightly along the insulation.