Abstract: The invention is directed to a motor-driven apparatus such as a motor-driven chain saw and the like having a lubricating oil pump having a piston which rotates about its central axis and an oil supply for a work tool. There is also a control means containing a rotating piston having cam member on the piston interacting with a control pin member which acts as a cam follower. There is provided means for adjusting the percentage of contact made between the cam member and the cam follower per revolution of the pumping member.

Abstract: A rotary compressor has a compression mechanism including main and sub bearings closing the ends of a cylinder bore and supporting a crankshaft having an eccentric portion on which a rolling piston positioned in the cylinder bore is rotatably mounted. Oil grooves are formed in the shaft holes of the bearings to receive lubrication oil from spaces defined by the rolling piston, the crankshaft eccentric portion and the main and sub bearings. The eccentric portion and the sub bearing are sized and shaped such that the oil groove in the sub bearing is always prevented from opening to the space adjacent thereto. The drawing force generated in the oil groove in the sub bearing by the rotation of a balancer attached to the lower end of the crankshaft is thereby prevented from acting on the space, thereby avoiding cavitation abrasion of the members facing the spaces.

Abstract: A pump unit comprising co-operating, push-pull connected reciprocating pumps for the pumping in portions of contents to packing containers on a packing machine. The reciprocating pumps (1) each comprise a control piston (4) connected to the pump piston (6) in control cylinders (18), which are joined together in pairs by means of a connecting pipe (20). The pipe is provided with a flow regulating valve (21) for regulating the flow rate of the hydraulic oil and hence the piston speed. The quantity of hydraulic oil in the connecting pipe can be regulated with the help of a supply tank (23) so that the length of stroke of the pistons can be adjusted.

Abstract: A peristaltic pump which corrects the effects of creep on a peristaltic tube. A plurality of spring biased rollers apply a substantially constant force to pinch the tube. A pair of elastic semi-circular sections are retained throughout the entire semi-circular back wall of the peristaltic pump. The pair of elastic semi-circular sections fully restore the initial cross-section of the tube in the area of the race where the rollers are not pinching the tube.

Abstract: Paint sprayer apparatus includes a paint sprayer frame having a sprayer apparatus mounted thereon, and two or more prime movers either of which may be interchangeably mounted on the frame for use in driving the sprayer pump. Each prime mover is provided with a pair of shoulder bolts in diagonally opposite corners of the respective prime mover bases that are adapted to be dropped into one or more pairs of correspondingly spaced slots in the paint sprayer frame. Fastener knobs threaded onto the outer ends of the shoulder bolts may be tightened or loosened and removed by hand to permit removal and replacement of one prime mover with another, and also loosened to permit proper adjustment of the belt tension. A belt tensioning stud may also be provided on the respective prime movers for receipt in an upwardly opening belt tensioning slot in the paint sprayer frame.

Abstract: The present invention provides an apparatus having a high vacuum environment and a plurality of components located within the high vacuum environment so as to be exposed to high vacuum. At least one of the plurality of components is formed from a plastic material comprising liquid crystal polymer to prevent outgassing of the plastics material in the high vacuum environment.

Abstract: A V-twin, two-stage compressor has valve plates disposed between the head and cylinder of each stage and mounting free-floating flexible read intake and exhaust valves therein. The flexible reeds are movably captured between the floors of respective reed recesses, and separate, non-fixed keeper bars are disposed over, but slightly spaced from, the reeds. Keeper bars over the exhaust reed extend above the valve plate for engagement by the head. A restrictor plate lies within a valve plate recess on keeper bars over the intake valve. A cored crankshaft providing motor drive shaft lubrication, and a removable counterweight providing crankshaft use with one-piece connecting rods is disclosed. A cooling fan is driven by the removable counterweight and V-shaped fan shroud projections direct cooling air over the cylinders and heads while another cooling air port directs air over an intercooler.

Abstract: A compressor for compression-evaporation cooling systems, which requires no moving parts. A gaseous refrigerant inside a chamber is acoustically compressed and conveyed by means of a standing acoustic wave which is set up in the gaseous refrigerant. This standing acoustic wave can be driven either by a transducer, or by direct exposure of the gas to microwave and infrared sources, including solar energy. Input and output ports arranged along the chamber provide for the intake and discharge of the gaseous refrigerant. These ports can be provided with optional valve arrangements, so as to increase the compressor's pressure differential. The performance of the compressor in either of its transducer or electromagnetically driven configurations, can be optimized by a controlling circuit. This controlling circuit holds the wavelength of the standing acoustical wave constant, by changing the driving frequency in response to varying operating conditions.

Abstract: A method and device are provided for infusing a fluid into a patient via a tubing. A peristaltic pumping apparatus is provided which applies a pumping action to the tubing. A linear variable differential transformer measures the diameter of the tubing subject to the pumping action. The diameter of the tubing is measured at various times and changes in the diameter of the tubing are utilized to adjust the pumping action on the tubing.

Abstract: The pump has several cylinders which are arranged in a row narrowly adjacent to one another and which accommodate the stroke working spaces of plungers or pistons. The stroke work of the pistons is hydraulically transmitted to diaphragms which close off pump working spaces inside of diaphragm working spaces in the direction of the cylinders. Because of the arrangement of the diaphragm working spaces or of the pump working spaces on different sides of the cylinder block, diaphragms or diaphragm working spaces may be arranged which have cross-sections that are large in comparison to the distance of the cylinders from one another.

Abstract: An injection molding apparatus where the position of the auger can be accurately determined from the position of the electric linear motor. The electric linear motor is in direct communication with a first hydraulic piston and cylinder. The first hydraulic piston and cylinder is in hydraulic communication with a second hydraulic piston and cylinder. The second hydraulic piston and cylinder is in direct communication with the auger. Thereby, the position of the auger can be accurately controlled by controlling the position of the electric linear motor.

Abstract: A stabilizer for vertically driven pumps in which a bearing is supported on the drive shaft approximately half way between the pump and the motor. The stabilizer bearing prevents bowing of the drive shaft which would cause considerable wear on the pump packing resulting in leaks. The stabilizer bearing is supported by adjustable arms each of which have an end which is bent to a 90.degree. angle and then twisted. Each of the ends of oppositely disposed support arms are twisted 90.degree., left and right respectively, after being bent so that the arms will counteract any torque on the drive shaft.

Abstract: A combined and integral pump and check valve combination is disclosed herein for the control of fluid flow through a fluid pump portion having an inlet port leading to a gland cavity occupied by a movable sealing element yieldably held in position closing or sealing the inlet port by a self-biasing member such as an open-cell foam material. A retaining ring used during the assembly procedure is disposed between the edge marginal regions of the self-biasing member and the movable sealing element which may function to stabilize the element. A sealed retaining plate is attached to the pump supporting the self-biasing member and the movable element combination and further defines an outlet port or duct on the side of the movable element opposite to its side which is adjacent to the inlet port.

Abstract: A gerotor structures is disclosed having a fluid bypass means for selectively siphoning off the high pressure fluid from the expanding gerotor cells so as to disable the operation of the device.

Abstract: A refrigeration compressor incorporating an improved arrangement and method for securing the motor cover to the motor stator is disclosed which arrangement and method also greatly facilitate the setting of the air gap between the stator and rotor.

Abstract: A fuel pump including a housing; a motor section provided in the housing which motor section includes an armature and a magnet opposed to the armature with a substantially annular space defined therebetween as a fuel passage, which armature includes a core formed by stacking a plurality of plates and a coil wound around the core; a pump section fixed to a lower end of the housing and connected to the motor section to be driven thereby; a fuel inlet formed in the pump section for sucking a fuel by driving the motor section; a fuel outlet formed at an upper end of the fuel pump for discharging the fuel fed from the fuel inlet through the fuel passage; and a first resin portion impregnated in the core and the coil for suppressing vibration of the armature. The fuel pump having the above construction preferably further includes a second resin portion coated on a surface of at least the first resin portion, which second resin portion has a resistance against the fuel and no influence upon the fuel.

Abstract: An electric motor driven fuel pump for a motor vehicle includes a tubular metal housing, a pump in the housing at an inlet end thereof, an electric motor in the housing adjacent the pump, a plastic end cap in the housing near a discharge end thereof, and a plastic RFI module in the housing over the end cap. Brushes for the motor are disposed in brush passages in the end cap and connected to brass terminal studs press fitted into the open ends of the brush passages. The plastic RFI module completely shrouds the terminal studs on the end cap to minimize corrosion and contamination and has a pair of flat metal contact plates embedded therein. An edge of the tubular housing is crimped over the outside diameter of the RFI module and overlaps the metal contact plates so that the plates reinforce the RFI module against forces urging dislodgment of the RFI module and the end cap from the tubular housing.

Abstract: There is disclosed herein a small and compact vacuum pump which serves as a portable vacuum source. The pump basically includes a cylinder coupled with a handle, and a piston in the cylinder coupled with another handle, along with a suitable valving assembly for allowing a vacuum to be drawn at an inlet of the pump. More particularly, there is also disclosed a vacuum release which can be attached to or form an integral part of the pump. The vacuum release comprises a closure member which can be moved upwardly and downwardly in a housing to close and open with respect to a valve seat and, respectively, allow a vacuum to be pulled or release the vacuum. The closure member is arranged to rotate and is biased by a suitable helical torsion spring to normally maintain the closure member in the closed position to therefore normally allow a vacuum to be drawn by the pump.

Abstract: A positive displacement pump is provided which is especially suited to be used as a left ventricle assist device (LVAD). The pump is electromagnetically actuated. An electromagnet produces a pulse which repels a magnet mounted in a diaphragm which forms one wall of a pumping chamber. The pumping chamber thereby constricts and fluid is expelled. The electromagnet has a reverse taper core and core cup magnet which produce a bipolar field effect upon a diaphragm magnet to cause the return of the diaphragm to its starting position, without the application of external power.

Abstract: An infustion pump fluid source cartridge having a pump interface portion and a fluid source portion. The top edge of the cartridge is bevelled in the fluid source portion to permit bending of the fluid source portion to securely position the pump interface portion against the pump without distorting the pump interface portion. A pump tube mount is provided for insertion into such cartridge. The pump tube mount includes a uniquely shaped front wall and a rear wall which extends downward in order to butt up against a ledge. Tabs extend from the rear wall in order to snap into an opening beneath the ledge. A compressible tube is mounted in the tube mount by providing a cylindrical fitting having an indentation. The tube may be held in the indentation by a collar surrounding the tube in alignment with the indentation.