Abstract: All of the components of a sump pump apparatus necessary to be in the sump are enclosed in a common case. In one embodiment, this case is of plastic and holds the motor means, the pump impeller and at least part of the water level sensors. The motor means is in a bell holding trapped air so that the water cannot reach the motor means. In one such embodiment the motor means is a single D.C. motor and in another embodiment it consists of a D.C. motor coupled by a one-way clutch to an A.C. motor which in turn is connected to the pump impeller. In each of these two embodiments, the water level sensor includes a tube having an open end in the bell to sample the air pressure in the bell and an end externally of the sump connected to a pressure actuated switch which turns on the motor means at a particular air pressure above ambient. Also within the bell is a float operated switch serving as a back-up to the air actuated switch. Using two motors, as mentioned above, the A.C.

Abstract: A variable displacement hydraulic system includes a charge system having a substantially constant charge pressure, a reciprocating piston type pump having a drive chamber in communication with the charge system, and a control valve regulating the flow of fluid from the charge system to the inlet of the reciprocating piston type pump which is manually movable from a closed fluid blocking position through a first range in which it varies and controls the quantity of fluid flowing to the pump inlet and a second range in which it varies the control of pressure of fluid flowing to the pump inlet at flow rates greater than those obtainable in the first range.

Abstract: This hydraulic engine utilizes two sets of hydraulic cylinders connected to a shaft so as to be alternately pressurized as the shaft is reciprocally driven by a pair of conventional internal combustion chambers. The outlets of all hydraulic cylinders are connected to a common output line via valves. During each power stroke certain of the hydraulic cylinders being pressurized are selectively disconnected (depressurized) from the output line. This effectively decreases the load on the driving chamber, and insures a relatively constant, high pressure hydraulic fluid output level despite changes in supplied force during each power stroke. The selective cylinder disconnection may be implemented programmatically in response to changes in engine parameters such as combustion chamber pressure. The engine also includes a pump for supplying input hydraulic fluid to each set of cylinders while that set is not being pressurized. The input fluid force is additive to the power supplied by the operative combustion chamber.

Abstract: A method is disclosed for a cascade control of a dynamic compressor to maintain a constant mass flow rate to a process. The method consists of a successive junction of control loops for controlling the speed of rotation, the pressure in the delivery, and the mass flow rate; the output signal of each outer loop being the input signal for the inner loop and each of the loops containing a compensating element to reduce the effects of large time constants of all previous loops.An automatic control system based on using the above method, distinguished by its great static and dynamic precision in maintaining a controlled parameter, and by the high reliability of protection of the compressor from surge, and protection from a dangerous increase of the speed of rotation and of a dangerous increase of the discharge pressure.

Abstract: A fuel tank assembly of a fuel tank and a centrifugal fuel pump, said pump being mounted outside said tank by a conduit structure, wherein an impeller of said pump is positioned below the predetermined lowest fuel level in said tank.

Abstract: A two-stage pump assembly employs a rotary-type gerotor pump combined with a reciprocating axial piston-type pump both mounted on and driven by a common shaft of a motor. A single key drivingly connects the rotor of the gerotor pump and the angle plate of the axial piston pump to the shaft of the motor for simultaneous operation of the two pumps. A wear sleeve is seated on the shaft of the motor and coacts with an oil seal carried by a common wall between the motor and the gerotor housing to prevent leaking of the fluid being pumped.

Abstract: A sump pump system includes a remote pressure responsive switch assembly designed for a wall plug and having a plug in connection for the pump motor cord, the pressure responsive switch assembly also having an air pressure connection to the sump pump for actuating the switch in response to a rise in level of water around the pump.

Abstract: Relative motion is provided between a set of primary magnets positioned along a path of relative motion, and a set of secondary magnets positioned along the path of motion to confront the primary magnets. Such motion causes the primary magnets to displace the secondary magnets in directions transverse to the path. Power output means are driven by transverse displacement of the secondary magnets. The polarities of the magnets are such that the forces of magnetic attraction in one direction parallel to the path are substantially equal to the forces of magnetic repulsion in the opposite direction parallel to the path, whereby a minimum of energy is required to produce said relative motion. SUThis invention relates to an energy conversion system wherein primary motion in a given path produces secondary motion in a direction transverse to the given path.

Abstract: This disclosure relates to a pumping apparatus that includes a hopper for receiving concrete with a delivery line extending from the hopper and a cylinder cooperating with the hopper to deliver concrete to the delivery line. A valve has an outlet end connected to the delivery line and is pivoted within the hopper between two positions to alternately connect the cylinder to the delivery line and to the hopper for delivering concrete to the delivery line and then withdrawing concrete from the hopper for subsequent delivery. An adjustable wear plate is located adjacent the inlet end of the valve so that continuous contacting engagement can be maintained between adjacent surfaces of the valve and the plate. The valve also has rigidifying means associated therewith and is supported on the hopper in a manner to prevent distortion during movement thereof.

Abstract: A hydraulic pump arrangement and control circuit for supplying fluid at high volume and a high pressure to a work circuit. The system utilizes a fixed displacement pump, a variable displacement pump, a dual pressure compensator, and an unloading valve working together to provide high pressure fluid delivery while reducing the horsepower requirements of the fixed displacement pump and the variable displacement pump. High flow is provided through the utilization of the combined pumps and high pressure is attained through the unloading of the fixed displacement pump through the unloading valve and destroking of the variable displacement pump in response to signals provided by the dual pressure compensator.

Abstract: A fuel delivery system comprised of a differential having three associated shafts. A first shaft is rotated at a speed responsive to the engine speed and drives the differential. A second shaft is driven by the differential against a variable retarding torque, which torque varies the speed of the second shaft. A third shaft is driven by the differential and drives a variable speed, fixed displacement fuel pump at a speed responsive to the speed of the second shaft combined with the speed of the first shaft.

Abstract: A controller maintains a constant desired fluid pressure in a fluid load driven by a variable flow fluid pump with a variable speed motor. A set point signal representing desired pressure and a signal from a pressure transducer representing actual pressure are applied to an error amplifier. The resulting error signal is applied through a variable gain stage to the motor control. The variable gain stage includes first and second variable gain amplifiers the first of which has a gain which is controlled inversely to pressure. The second variable gain amplifier has a gain which is controlled in proportion to flow. In this manner, the gain of the controller changes in inverse proportion to the restriction of the fluid load. This makes the performance of the controller independent of changes in the fluid load by keeping the total loop gain constant.

Abstract: A radial piston pump wherein the drive shaft for the pistons in radially extending cylinders of the housing has an eccentric which moves the pistons outwardly against the opposition of springs. The inlet port of the housing communicates with the cylinders by way of a first passage which contains a reciprocable valve member and can discharge fluid directly into one of the cylinders. The other cylinders receive fluid from the first passage by way of an annular space which surrounds or is adjacent to the inner end of the shaft and bores which are machined in the housing to connect the annular space with the other cylinders. The outlet port of the housing can receive pressurized fluid from the cylinders by way of check valves. The valve member is biased by a spring to normally assume a first position in which it allows fluid to flow from the inlet port to the cylinders as long as the pressure at the outlet port is within a first range of pressures.

Abstract: A swash plate pump of the type wherein a plurality of pistons bear against the swash plate and are given a reciprocating movement when the plate is rotated by a drive shaft. The drive shaft comprises a solid portion and a hollow portion which latter constitutes a central admission conduit for the liquid to be pumped. The swash plate is mounted at the junction between the solid and hollow portions of the shaft, and the plate has an aperture which communicates with the central conduit and a crescent-shaped port for liquid distribution to the pistons. These pistons are arranged in a circle concentric with the solid shaft portion. A taper roller bearing is mounted on the hollow shaft portion and the front face of the swash plate bears against the roller bearing. The discharge flow of liquid can be divided for distribution into several separate flows by a cylindrical sleeve located on the solid shaft portion.

Abstract: A swash-plate type compressor for air conditioning of vehicles. A pair of cylinder blocks are rigidly combined in coaxial alignment. The combined cylinder blocks form three bores. A piston is slidably disposed in each bore and the motion of each piston is actuated by a swash-plate mechanism mounted on a drive shaft which is connected to a driving source. A lubrication reservoir is formed in a sector space sandwiched by a pair of said bores and an inside wall of said combined cylinder block. A geometrical longitudinal center line of said combined cylinder block is biased downward from a geometrical center line of said drive shaft.

Abstract: An intensifier unit includes a pair of sequentially operated reciprocating ram assemblies, each powered by a cylinder motor. Extension of the cylinder rods is accomplished by application of pressurized hydraulic fluid to the pistons. The pistons are returned quicker than they are extended by means of continuous application of pressurized air to the back side of the pistons. The cylinder motors are precompressed prior to their respective forward strokes by means of an accumulator which continuously bleeds from the main hydraulic fluid supply line. Circuitry is provided to insure that precompression continues even if the ram and its driving piston move from their retracted position. Also disclosed is a safety interlock to shut down the intensifier if both cylinder rods become accidentally simultaneously extended.

Abstract: A piston shoe for fluid pressure pump motors of the piston type is substantially disc-shaped and includes a concave portion provided upon one end face thereof for seating the convex portion of a piston rod associated with the piston and cylinder assemblies of the pump motor, while the other end face thereof is substantially flat for contacting the sliding surface of a swash plate. A holder or retainer is also provided in association with the shoe for retaining the piston rod within the concave seat, such retainer being secured to the shoe by biasing means, or alternatively by being pressed or crimped thereon.

Abstract: A pump control system of the liquid level responsive type includes an air pump to pressurize a pressure responsive control unit in accordance with the level of water within a well, the system having an electrical control circuit including a switch which operates to turn off the air motor and turn on the water pump motor when the water level in the well reaches a certain high level and to turn off the pump motor and turn on the air motor when the water level reaches a certain low level in the well.

Abstract: The improved clearance pocket or chamber for compressors described in this specification includes a hollow housing attached to the cylinder of the compressor. The housing is divided into two clearance chambers and into three power chambers. A valve member located in the housing is movable to provide communication between the compressor cylinder and one or both of the clearance chambers. Movable pistons operably arranged with respect to the valve member are located in the power chambers to position the valve member in the desired position. Suitable fluid power means is connected with the power chambers to cause the desired movement of the pistons.

Abstract: A reciprocating fuel pump for an internal combustion engine comprising a body having an outer wall defining a pumping chamber and a pair of generally cylindrical projections in fluid communication with the pumping chamber, the projections defining an intake cavity with an intake check valve therein and a discharge cavity with a discharge check valve therein. Elastomeric tubular conduits within the projections form the intake and discharge cavities and are of a flexibility sufficient to provide a collapsing and an expansion of the conduit walls upon relatively small pressure variations resulting from the suction and discharge strokes of the diaphragm. The elastomeric conduits thereby provide pulsating chambers to smooth out the flow of fuel and thereby increase the fuel flow through the fuel pump.