Patents Examined by A. P. LaPointe
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Patent number: 3945767Abstract: The pulsations produced by a pulsating positive displacement pump are damped by interposing in the inlet line to the pump a conduit carrying at least one upstanding open ended tube having its lower end communicating with the conduit.Type: GrantFiled: August 8, 1974Date of Patent: March 23, 1976Assignee: DeSoto, Inc.Inventor: Abdullah M. Rokadia
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Patent number: 3945766Abstract: A radial piston pump wherein the crank pin of a crankshaft engages with arcuate shoes at inner ends of radially extending pistons which are reciprocable in discrete cylinders. The outer end of each cylinder normally bears against the convex sealing surface of a discrete back support having in the sealing surface a pressure port for evacuation of pressurized fluid in response to outward movement of the respective piston. The cylinders are caused to move their outer ends away from full engagement with the respective sealing surfaces in response to inward movements of the respective pistons so that the chambers of the cylinders can draw fluid from the interior of the pump housing. The cylinders are caused to move substantially radially and away from the respective sealing surfaces due to frictional engagement between their internal surfaces and the external surfaces of the respective pistons.Type: GrantFiled: October 24, 1973Date of Patent: March 23, 1976Assignee: Rheinische Chamotte - und Dinas WerkeInventor: Robert Gelon
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Patent number: 3943826Abstract: In a hydraulic motor or pump comprising a casing, a shaft, means journalling said shaft in said casing, an eccentric on said shaft, a bearing block within said casing and about said eccentric and having a bore permitting relative rotation between said bearing block and said eccentric, a plurality of hydraulic cylinders formed and grouped in said bearing block radially about said eccentric in a common plane normal to the axis of said shaft, a plunger slidable in each of said cylinders, said plunger having an outer end face, flat faces of abutments formed in said casing at its internal surface for engagement with said outer end faces of said plungers, respectively, means urging said plunger in the direction of said face abutment of said casing during the operation of said motor or pump, and said bearing block having a port communicating between its bore and the interior of each of said cylinder interior, whereby pressure liquid is admitted to the cylinders in turn one after another during the operation of saidType: GrantFiled: May 23, 1975Date of Patent: March 16, 1976Assignee: Shimadzu Seisakusho, Ltd.Inventor: Yasuo Kita
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Patent number: 3943827Abstract: The invention refers to an axial-piston pump or motor, having a piston which defines, with a cylinder, a chamber. A first end of the piston bears against a plate by means of a hydrostatic shoe having a cavity in the bearing face, a duct connecting the chamber to that cavity and being furnished with a constriction.The piston has a recess which is arranged in the cylindrical portion of its second end remote from the first end, the constriction being constituted by the clearance lying between at least one collar portion of the piston which separates the recess from the chamber and the cylinder. A second recess is provided in the piston, the constriction being located between the first and second recesses.The invention is applicable to the execution of a pump having high operational characteristics, particularly as far as concerns pressure.Type: GrantFiled: June 4, 1974Date of Patent: March 16, 1976Assignee: PoclainInventor: Jean E. Becquet
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Patent number: 3941505Abstract: Method and apparatus for pumping fuel to jet engines and the like utilizing at least two stages, the first of which is a main stage including a centrifugal pump, together with a secondary stage including a positive displacement pump. The two pump stages are driven from a common drive means. In the new system, the positive displacement pump is used as a startup pump and the centrifugal pump is the sole pumping means employed during conditions of higher fuel demand. Speed responsive means are provided in conjunction with the positive displacement pump, which means are responsive to the speed of the centrifugal pump, the speed responsive means being used to terminate pumping action by the positive displacement upon the centrifugal pump reaching a predetermined speed.Type: GrantFiled: June 25, 1973Date of Patent: March 2, 1976Assignee: TRW Inc.Inventors: Pius J. Nasvytis, Milton W. Mueller
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Patent number: 3941508Abstract: This gas pressure control system is intended primarily for testing gauges by providing an accurate static gas pressure over a wide range, preferably from zero to 10,000 pounds per square inch. The system is equipped with a pressure intensifier that operates automatically to raise the delivery pressure above the supply pressure when necessary. The supply may be a bottle of nitrogen under pressure of two thousand two hundred pounds per square inch, and the pressure intensifier is preferably a cylinder-and-piston motor-pump combination with a displacement ratio such as 70 to 1.Type: GrantFiled: April 11, 1975Date of Patent: March 2, 1976Assignee: Marotta Scientific Controls, Inc.Inventor: Donald A. Worden
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Patent number: 3941032Abstract: The invention provides a capsule for damping pressure pulses in the working fluid of piston pumps and motors, the capsule being formed with co-axial inner and outer pervious walls which serve to limit the contraction and expansion of a flexible gas-filled bag enclosed between them.Type: GrantFiled: June 24, 1974Date of Patent: March 2, 1976Inventor: Robert Cecil Clerk
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Patent number: 3941507Abstract: A sump containing a conventional sump pump has a battery operated emergency pump. A trapped air pressure operated switch turns the emergency pump on when the water level rises excessively in the sump and an alarm signal is given. If the trapped air operated switch fails to turn the pump on, a non-mechanical float switch does so after a further rise in the liquid level in the sump and at the same time an emergency warning signal is produced. The float switch also turns on the emergency pump if that pump had not previously been turned on due to a malfunction in the trapped air switch. When the emergency pump turns on, a battery charger is energized from the alternating current supply so as to prevent depletion of the battery so long as the alternating current is available. Normally, the battery charger is turned on periodically by a timer to maintain adequate battery charge on a regulated basis. If battery power fails alarm is actuated. An alarm is actuated when alternating current power failure occurs.Type: GrantFiled: April 12, 1974Date of Patent: March 2, 1976Inventor: Karl O. Niedermeyer
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Patent number: 3939717Abstract: A mechanism for reciprocating engines or pumps, the mechanism transmitting power from the axially arranged piston rods to the axially arranged main shaft via a slant fixed to said shaft and a cross head gripping and sliding on the edge of the slant. The inward directed components of the rotating transverse force vector T are absorbed by one or more Michell thrust blocks sliding on a cylindrical surface coaxial with the main shaft.Type: GrantFiled: July 3, 1974Date of Patent: February 24, 1976Assignee: Havera Development Ltd.Inventor: Mogens Roesdahl Groth Teisen
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Patent number: 3938910Abstract: Various functions of a production oil well are monitored to cause a switch closure for each normal cycle of the pump. Alternatively, the level of the fluid within the well is monitored to cause the switch closure. The switch closure activates a first oscillator whose count is compared with a variable frequency oscillator over a given period of time to ascertain the percentage of time of normal operation. The integrated time is adjusted to shut down the system when the percentage of time drops to or below the preselected amount. In response to the integration timer signal, a shutdown timer is turned on which restarts the cycle after a preselected amount of time. When the system is restarted by the shutdown timer, a pump-up timer is turned on which is adjusted to allow for a desired pump-up time. As the pump-up timer is allowing the system to recycle, the integration timer is reset and the recycling is completed if the requirements of the integration timer are met.Type: GrantFiled: November 1, 1974Date of Patent: February 17, 1976Assignee: Dresser Industries, Inc.Inventor: Bobby L. Douglas
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Patent number: 3938397Abstract: A power transmitting mechanism for reciprocating engines or pumps connecting the piston rods of a plurality of cylinders with a slant on a main shaft, the cylinder axes being parallel with the main shaft. The connection is provided by means of claw-shaped crossheads gripping the slant, one crosshead for each piston rod. Between the crosshead and the slant a main thrust block and a back thrust block are placed eccentrically. The crosshead may pivot around its longitudinal axis and is provided with two thrust blocks of the Michell type, the centres of these two blocks being arranged in a plane perpendicular to the longitudinal axis of the crosshead and in the middle of the gap of the crosshead.Type: GrantFiled: July 30, 1974Date of Patent: February 17, 1976Assignee: Havera Development Ltd.Inventor: Gunnar Olaf Vestergaard Rasmussen
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Patent number: 3937130Abstract: A low friction seal assembly for a fluid energy translating device seals a pair of pressure fluid chambers from one another. The assembly is mounted in a movable member of the device and has an elastic member which mechanically and hydraulically biases a seal member into engagement with the walls of the device.Type: GrantFiled: November 4, 1974Date of Patent: February 10, 1976Assignee: Abex CorporationInventors: Cecil E. Adams, Ellis H. Born
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Patent number: 3936235Abstract: The invention relates to a fuel oil supply assembly of the type having a magnetic pump and an armature for driving a pump element or piston which is a part of a resilient oscillatory system. A flow restricting pressure regulating vlave in the delivery line is itself regulated in a manner such that the stroke of the oscillatory system is automatically adjusted so that only the exact quantity of oil required by the nozzle is delivered. The intermittent delivery movement inherent in the oscillatory system is thus made smoother by a damping of the oscillations which results from the piston being caused to travel over only a fraction of its maximum stroke.Type: GrantFiled: August 7, 1974Date of Patent: February 3, 1976Assignee: Danfoss A/SInventor: Peder Larsen
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Patent number: 3935707Abstract: A hydraulic control system includes a generating circuit for providing power to a work function. A driving apparatus operates the generating circuit. A control circuit is connected to the generating circuit and the driving apparatus for permitting delivery of power to the work function when the driving apparatus is operating up to a predetermined speed. The control circuit also stops delivery of power to the work function when the driving apparatus runs above the predetermined speed.Type: GrantFiled: July 22, 1974Date of Patent: February 3, 1976Assignee: General Signal CorporationInventors: Eugene Scott Murphy, Clyde Bennett Stevens
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Patent number: 3935796Abstract: A hydraulic pumping apparatus including a cylindrical housing member having an open upper end closed by a cover held in place by a snap ring. A rotor is rotatably supported in the housing and in turn supports a plurality of pistons which are parallel to the axis of rotation of the rotor. The novelty resides in the swash plate assembly which includes an off-the-shelf bearing comprising two parallel plates with all bearings sandwiched therebetween with one of the plates engaging the pistons. An integral plastic ring member is disposed within the annular opening of the upper thrust plate of the bearing assembly and includes trunnions extending laterally in opposite directions for disposition in grooves in the cover member for changing the angle of inclination of the bearing assembly. An adjustment member extends through the cover for engaging the upper thrust plate of the bearing assembly to change the angle of the inclination thereof.Type: GrantFiled: April 16, 1974Date of Patent: February 3, 1976Assignee: Teleflex IncorporatedInventor: Robert A. R. Wood
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Patent number: 3935706Abstract: A hydraulic control system includes a generating circuit for providing power to a work function. A driving apparatus operates the generating circuit. A control circuit is connected to the generating circuit and the driving apparatus for permitting delivery of power to the work function when the driving apparatus is operating up to a predetermined speed. The control circuit also stops delivery of power to the work function when the driving apparatus runs above the predetermined speed. The control circuit further includes a cut-off apparatus for stopping delivery of power to the work function when the driving apparatus is running up to the predetermined speed.Type: GrantFiled: July 22, 1974Date of Patent: February 3, 1976Assignee: General Signal CorporationInventor: Clyde Bennett Stevens
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Patent number: 3934967Abstract: A refrigeration compressor including a sealed housing with a stationary cylinder block having an annular array of axial cylinders, pistons reciprocable in the cylinders, a rotatable cam for reciprocating the pistons, an annular inlet channel around the cylinder block, intake valving for admitting fluid from the inlet channel to the cylinders on the intake strokes of the pistons, outlet valving for discharging high pressure fluid from the cylinders on the compression strokes of the pistons, and a baffle mounted on the end of the cylinder block over the outlet valving.Type: GrantFiled: July 12, 1973Date of Patent: January 27, 1976Assignee: Sundstrand CorporationInventor: Edwin L. Gannaway
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Patent number: 3931830Abstract: A system for pumping of liquid under pressure, in which a pressure switch is adapted to control the starting and stopping of the pump within a safe pressure range, and in the event of malfunction of the pressure switch, the service line and associated plumbing is isolated from the pump to protect against development of pressures in the serviceline which might damage the plumbing.Type: GrantFiled: March 20, 1974Date of Patent: January 13, 1976Assignee: Jacuzzi Bros. IncorporatedInventor: Darrell D. Gritz
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Patent number: 3932064Abstract: A multiple re-entry compressor of the kind set forth in USA Patent application Ser. No. 335,162 now U.S. Pat. No. 3,869,220 is described having inter cooling between successive passes of the rotor blading. A further improvement is described in which variable aperture arcuate segmented flowpaths are provided.Type: GrantFiled: October 8, 1974Date of Patent: January 13, 1976Assignee: The Secretary of State for Defense in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventor: Colin Andrew Millar Tayler
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Patent number: 3932067Abstract: Apparatus used in the field of liquid chromatography. There is disclosed pump apparatus for continuously delivering a flow of carrier liquid either at a constant rate of flow or at a constant pressure. The pump apparatus includes a pair of differential-piston pressure intensifiers which are sequentially operated so that the high-pressure sides of the pressure intensifiers sequentially supply carrier liquid to the chromatograph column. Each pressure intensifier is sequentially operated by a constant-rate of flow application of hydraulic liquid, with essentially pulseless operating transition between pressure intensifiers occurring during constant-pressure application of hydraulic liquid to both of the pressure intensifiers at a pressure measured during previous constant-volume hydraulic operation. An embodiment of the pump apparatus pumps plural carrier liquids in desired fixed or variable proportions.Type: GrantFiled: February 27, 1974Date of Patent: January 13, 1976Assignee: Micromeritics Instrument CorporationInventors: Dean M. Ball, Ronnie W. Camp, Warren P. Hendrix, Clyde Orr, Jr.