Class 417/523 - Including valved piston

Subclass of Class 417 - Pumps
Definition: Apparatus in which at least one of the chambers is defined
No. of patents: 36
Last issue date: 05/29/2012

Number	Title	Issue Date
8186976	Combination compressor and vacuum pump apparatus and method of use A combination compressor and vacuum pump apparatus comprising a common drive mechanism, a compressor piston-cylinder unit mechanically coupled to the drive mechanism, the compressor piston-cylinder unit comprising a hollow first piston rod connected to the drive mec...	05/29/2012
7390173	Well fluid pumping arrangement A liquid well pumping arrangement, especially for oil wells, comprising a pair of adjacent downhole reciprocating pumps each having a barrel, a piston rod connected to a piston slidable within the barrel, and valves adapted to cause liquid to flow from a lower inlet...	06/24/2008
7350534	Hollow ball valve assembly Apparatus and methods for constructing a valve comprising a sealing member and a hollow ball operable to sealingly engage the sealing member. A guide housing disposed about said hollow ball and does not constrain rotation of said hollow ball. A spring is disposed be...	04/01/2008
7137532	Strainer and level indicator for a hot melt adhesive system A strainer for a hot melt adhesive system is fixed to the side wall(s) of a tank without fasteners to strain the adhesive flow and protect a pump of the system. The strainer may also be configured to act as a shield for a level indicator located within the tank....	11/21/2006
7051904	Pump with integral filter for a hot melt adhesive system An pump for use with a dispensing unit of a hot melt adhesive system includes a removable filter. The filter is coupled with a cartridge which is threaded into a chamber of the pump. The chamber is located between the inlet and outlet of the pump so that this portio...	05/30/2006
7029241	Circumferential piston compressor/pump/engine (CPC/CPP/CPE); circumferential piston machines A rotary piston machine includes a first spheroidal element including pistons and/or cylinders and a second spheroidal element including pistons and/or cylinders, wherein the first element can move relative to the second element. The machine can be used as part of a...	04/18/2006
6832900	Piston mounting and balancing system A compact 180° opposed piston pump/compressor minimizes axial spacing between its pistons on the drive shaft and thereby reduces the shaking couple and noise from reciprocation. Each piston has its own eccentric element press-fit into the connecting rods so as not ...	12/21/2004
6817846	Gas compressor and method with improved valve assemblies A gas compressor and method according to which a piston assembly reciprocates in a bore to draw the fluid to be compressed into the bore during movement of the piston unit in one direction and to compress the fluid during movement of the piston unit in the other dir...	11/16/2004
6814548	Multiple piston engine with vibration reducing properties The invention relates to a piston engine which is essentially comprised of an engine shaft and a set of modules, each of which comprises a cylinder and a piston powered by the engine shaft in the cylinder, each module resulting in vibratory excitation of the engine ...	11/09/2004
6764287	Pump provided with diaphragms A casing body is formed with a vent hole. The casing body has an inner face formed with a plurality of grooves respectively communicated with the vent hole. A plurality of diaphragms are respectively inserted into the grooves to form a plurality of pump chambers. An...	07/20/2004
6702556	Multi-cylinder compression pump The invention concerns a pump for compression of gases, such as air, of the type comprising a first cylinder and a second cylinder, a piston dividing said first cylinder into a first chamber located ahead of the piston and a second chamber located behind ...	03/09/2004
6655935	Gas compressor comprising a double acting piston, an elongate chamber, multiple inlets mounted within heads on both sides of the chamber, and one central outlet A gas compressor and method according to which a plurality of inlet valve assemblies are angularly spaced around a bore. A piston reciprocates in the bore to draw the fluid from the valve assemblies during movement of the piston unit in one direction and ...	12/02/2003
6634867	Shuttle piston assembly with dynamic valve A portable, high capacity air compressor system for charging air tanks over wide pressure ranges with maximum volumetric efficiency is characterized by employing a shuttle piston assembly in which piston pairs are arranged with axially aligned cylinder pa...	10/21/2003
6190142	Manual air pumps having selectable high pressure and high pressure modes A manual air pump includes an outer tube and an inner tube coaxially mounted in the outer tube. An inner chamber is defined in the inner tube. An outer chamber is defined between the outer tube and the inner tube. A head is coupled to first ends of the in...	02/20/2001
6155806	Dual acting piston pump having reduced back flow between strokes A dual acting pump for dispensing pressurized liquids including a pump housing, a reciprocating pump shaft contained in a pumping chamber and at least one spring-biased check valve member. In the preferred embodiment, a spring-biased check valve member is...	12/05/2000
6093003	Piston pump The invention relates to a piston pump with a piston received axially displaceably in a pump bore. To improve the aspiration performance of the piston pump. A cuff with a U-shaped annular cross section is provided, the cuff is inserted into the pump bore ...	07/25/2000
6071096	Pneumatic cylinder, in particular for actuating fume extraction valves in fume and heat extraction plants A pneumatic cylinder for actuating fume extraction valves in fume and heat extraction plants has a piston (2) that may be actuated from both sides with at least one working surface and that can be made to slide by pressurised air in a cylinder (1) with at...	06/06/2000
6030185	Radial piston pump The present invention relates to a pump, more particularly a radial piston pump, including at least two pump pistons (10) with an associated working chamber (13) each, wherein the working chambers (13) are connected to suction lines (4) by way of suction ...	02/29/2000
5980222	Hermetic reciprocating compressor having a housing divided into a low pressure portion and a high pressure portion A compressor assembly includes a compressor mechanism mounted within a hermetically sealed housing. The housing is effectively divided into a low pressure area at a relatively low temperature and a high pressure area at a relatively high temperature. A mo...	11/09/1999
5975864	Pump with self-reciprocating pistons A pump for providing a pressurized fluid flow. The pump includes a pump casing that defines a pump chamber. A pump shaft is has a head end in the pump chamber; the head end has a circumferential outer surface. The pump shaft head end has inwardly extendin...	11/02/1999
5816787	Motion conversion rotator apparatus and method A method and apparatus to convert the torque of a drive shaft into reciprocating energy to drive and pull a piston utilizing a nodal rotator attached to the drive shaft, or alternatively to convert reciprocating energy into torque, said rotator having com...	10/06/1998
5727930	Valves and rod assembly A hollow through-bolt is threaded internally and externally, at one end, to receive therein a reciprocable, end-threaded rod. A pair of fluid-control valves, centrally bored, are mounted on the through-bolt in spaced apart disposition. The other end of th...	03/17/1998
5651302	Actuator pump An actuator pump has one or more colinear piston cylinders (2, 3, 25) in a cylinder housing (1) in which change of volume is provided by reciprocative relationship of colinear pistons (4, 5, 23, 24,) in the colinear piston cylinders. One or more travel gu...	07/29/1997
5628625	High pressure fluid pump for use in vehicular braking system having anti-lock and traction assist feature A pump for a vehicle braking or traction control system integrated into a hydraulic control unit. The housing for the hydraulic control unit has at least one counterbore in which a cylindrical sleeve is disposed. The cylindrical sleeve has a counterbore w...	05/13/1997
5494410	Manually operable vacuum pump A manually operable vacuum pump having a housing including first and second pump chambers whose volume is altered by movement of a displaceable piston which is moved by means of a piston rod attached thereto and fed through one of the first and second pum...	02/27/1996
5370504	Ambulant reciprocating compressor having plural pressure collection chambers A pair of oppositely directed pistons are reciprocatingly mounted in a cylinder. The cylinder is formed unilaterally with and encapsulated within a tank for receiving compressed air and has an exhaust port at each end and a valve for controlling the flow ...	12/06/1994
5213482	Hydraulic radial-type piston pump A radial piston pump is described with dual pistons which are slidingly accommodated within a bushing coupled end to end to a valve body. Automatically controlled suction and discharge valves for a pressure chamber are arranged one behind the other in the...	05/25/1993
5141413	Gas compressor having a variable-volume clearance pocket, and means for varying a clearance pocket in a gas compressor The compressor has a straight cylinder wholly confined within which are inlet valves, and reciprocatable discharge valves. One inlet valve is set in place by a centerbolt which can be turned by a wrench (or the like) to move the inlet valve to selected po...	08/25/1992
5100305	Reciprocating piston pump The invention is directed to improving the performance of a reciprocating piston pump in terms of noise. The reciprocating piston pump has a drive shaft, which has a circular cylindrical swash member, which is set at an acute angle (ଲ) to the longit...	03/31/1992
4842492	Compressor discharge muffler having cover plate A hermetically sealed scotch yoke compressor assembly is disclosed wherein a crankcase includes annular channels formed on the top and bottom surfaces thereof defining muffling chambers. Gas refrigerant compressed within radially disposed cylinders into c...	06/27/1989
4755112	Water/air pumping system The present disclosure is directed to a water/air pumping system comprising essentially a substantially flat primary reservoir, a header tank and a pump. At least one reciprocating piston is powered through the tank. Eccentric drive cams are directly conn...	07/05/1988
4473340	Combined fluid pressure actuated fuel and oil pump Disclosed herein is a combined fuel and oil pump comprising a reciprocally movable member for pumping fuel in response to member reciprocation, a reciprocally movable element for pumping oil in response to element reciprocation, and a fluid pressure actua...	09/25/1984
4443162	Fluid pump A fluid pump having manually operable and power operable sections 10a, 10b mounted within a unitary pump body 12 that defines at least one suction and one discharge port 14, 16. The manually operated section comprises a body section 12a defining a bore 20...	04/17/1984
4115041	Pumps A pump comprising a body having at least one chamber and preferably two axially spaced and aligned pumping chambers, each such pumping chamber communicating at opposite ends respectively with a pump inlet and a pump outlet and containing an actuator recip...	09/19/1978
4084923	Double-acting, downhole pump assembly A downhole, hydraulically actuated pump assembly of the free or fixed type which includes a control valve positioned above the engine, and a plurality of pistons connected together by a hollow connecting rod. The pistons are arranged to divide a productio...	04/18/1978
4026468	Headlamp cleaning assembly A headlamp cleaning assembly of the type for cleaning vehicle headlamps and including first and second nozzles for jetting an air/liquid mixture against a headlight surface. A regulator means is included for mixing air and liquid and for sequentially supp...	05/31/1977

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Class 417/523 - Including valved piston