Patents Examined by Peter Korytnyk
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Patent number: 5252035Abstract: A suction structure for electrically-driven hermetic compressor. The compressor comprises a suction muffler having an upper outlet and a lower inlet which is formed at its bottom with means for discharging refrigerating oil, first elastic means for adsorbing vibration occurring during operation of compressor and guiding suction gas into the suction muffler which is fitted in the lower inlet of the suction muffler, second elastic means for fixing the first elastic means to the inlet of the suction muffler which is interposed between the inlet and the first elastic means without a gap therebetween, and filtering means for preventing refrigerating oil from being introduced into a cylinder which is disposed to the inlet of the suction muffler. Therefore, the suction structure can prevent refrigerating oil from being introduced in the cylinder and also prevent damage and generation of the inlet of the suction muffler due to interference therebetween is prevented, thereby improving performance of compressor.Type: GrantFiled: December 17, 1992Date of Patent: October 12, 1993Assignee: Goldstar Co., Ltd.Inventor: In S. Lee
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Patent number: 5251537Abstract: A hydraulic driving system uses a variable capacity type swash plate piston pump that discharges a fixed quantity of operation oil. The piston pump is provided with a swash plate and a swash-plate tilt angle control mechanism. The pump is operated by the engine to drawing discharge oil whose quantity corresponds to the tilt angle of the swash plate. An oil passage provided with a restriction, is connected to the discharge side of the piston pump. A control valve functions in accordance with the pressure difference between the input and output sides of that restriction to feed operation oil to the tilt angle control mechanism via the oil passage. A tilt angle generating mechanism in the tilt angle control mechanism, causes the oil controlled by the control valve to act on the swash plate in order to increase its tilt angle. A tilt angle return mechanism in the tilt angle control mechanism urges the swash plate to decrease the tilt angle.Type: GrantFiled: July 14, 1992Date of Patent: October 12, 1993Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Tatsuyuki Hoshino, Kunifumi Goto, Shigeki Kanzaki
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Patent number: 5252032Abstract: A variable capacity swash plate type compressor having compression chambers formed on one side of the plungers only, and control chambers for controlling the capacity of the compressor provided on the other side of the plungers. The capacity of the compressor is controlled by adjusting the pressure in the control chambers, whereby the inclination of the swash plate is changed because the force exerted on the plunger by the pressure in the control chamber, i.e., the force moving the swash plate, is changed. Therefore, since the volume of the compression chambers is relatively small, and a higher control pressure can be used, the response and the stability of the capacity control is improved.Type: GrantFiled: July 9, 1992Date of Patent: October 12, 1993Assignee: Nippon Soken, Inc.Inventors: Shigeki Iwanami, Mikio Matsuda
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Patent number: 5252042Abstract: A first cylinder bore (7) for accommodating a first piston (8), a plunger bore (20) for accommodating a plunger (21), and a second cylinder bore (57) for accommodating a second piston (58) are provided in this order from above. The plunger (21) is fixed to the first piston (8). A cushion chamber (61), provided below the second piston (58), and an outlet (25b) of a second check valve (25) for gas discharge are connected to each other via a communicating passage (62). The second piston (58) is prevented from moving upward in excess of a set extent by a stopper (64) provided in the peripheral wall of the second cylinder bore (57).Type: GrantFiled: August 7, 1992Date of Patent: October 12, 1993Assignee: Kabushiki Kaisha KosmekInventor: Keitaro Yonezawa
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Patent number: 5251536Abstract: Variable displacement axial piston pumps are useful in outputting pressurized fluid to operate fluid actuators. The currently available center pivoted variable displacement axial piston pumps waste energy by compressing trapped volumes of oil during operation. The present variable displacement axial piston pump has first and second opposite sides of a swash plate pivotally connected to a pump housing by a pair of off-center pivots with the angle of the swash plate being controlled by first and second actuators connected to the opposite sides of the swash plate. Each of the off-center pivots includes a pair of pivot pins connected to the housing and releasably pivotally seated in a pair of semi-cylindrical pockets formed in the opposite sides of the swash plate. The first actuator at the first side of the swash plate holds the semi-cylindrical pocket seated against the pivot pin while the second actuator controls pivotal movement of the swash plate about the first off-center pivot.Type: GrantFiled: January 15, 1992Date of Patent: October 12, 1993Assignee: Caterpillar Inc.Inventor: William K. Engel
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Patent number: 5249933Abstract: A submarine is equipped with a conventional main hydraulic system and has least one hydraulic actuator located outside the vessel's pressurized hull where it is susceptible to contamination of its hydraulic fluid. The actuator is operated from an isolation system that includes a slave piston driven by a power piston from the main hydraulic system to keep a desired pressure in the secondary system by operating the power piston only as required for this purpose. Both power and slave piston positions are related and a two position limit switch is tripped by switch actuators linked to these pistons for operating the power and slave pistons. This isolation system prevents any contaminants in the external system from contaminating the internal system.Type: GrantFiled: October 1, 1992Date of Patent: October 5, 1993Assignee: The United States of America as represented by the Secretary of the NavyInventor: Paul E. Moody
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Patent number: 5249932Abstract: A diaphragm metering pump having control over diaphragm extension is described. A position sensor is incorporated in a diaphragm metering pump to indicate the relative position of the diaphragm during flexure. When excessive extension of the diaphragm is sensed by the position sensor, a control valve will provide hydraulic fluid from a reservoir for inhibiting further deflection of the diaphragm in the direction in which it was moving. Diaphragm life is extended as well as the accuracy of metering provided by the pump maintained.Type: GrantFiled: October 7, 1991Date of Patent: October 5, 1993Inventor: Erik Van Bork
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Patent number: 5246350Abstract: A high efficiency solar powered water pumping system (10) includes a solar collector (12) for heating and vaporizing a working fluid. The vaporized working fluid is passed to a motor and valve assembly (20) that alternatively delivers the working fluid to a power unit (22) and exhausts the working fluid from the power unit to a condenser (32). The power unit has a driving member (128) that moves up and down driving a sucker rod (194) of a sucker rod assembly (26) which raises water from a well in the earth. The water pumped from the ground passes through a tube (36) in the condenser. The working fluid which has been exhausted from the power unit into the condenser, condenses to a liquid. The liquid working fluid is then pumped from the condenser by a positive displacement pump (40) and is returned to the solar collector to repeat the cycle.Type: GrantFiled: June 2, 1992Date of Patent: September 21, 1993Assignee: International Product & Technology Exchange, Inc.Inventors: David Lackstrom, Kidambi Raghunathan
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Patent number: 5244352Abstract: A multi-stage vacuum pump installation having an oil-lubricated or dry-running mechanical displacement pump located in the atmospheric stage. The oil-lubricated or dry-running pump is preceded on the vacuum side by at least one additional pump which is a side channel compressor pump (or gas ring pump). A side channel compressor pump located upstream of the oil-lubricated or dry-running pump reduces oil consumption and at the same time improves efficiency of the installation.Type: GrantFiled: December 21, 1990Date of Patent: September 14, 1993Assignee: Siemens AktiengesellschaftInventor: Kurt-Willy Mugele
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Patent number: 5244360Abstract: In a hydraulically controlled diaphragm pump for high pressures, the diaphragm situated between the hydraulic control chamber and the working chamber is composite and comprises two thin metal diaphragms having between them an intermediate diaphragm that is thick, is made of synthetic material, has high crushing strength, and is in the form of an elastically deformable vault whose concave side faces towards the working chamber.Type: GrantFiled: December 12, 1991Date of Patent: September 14, 1993Assignee: Dosapro Milton RoyInventor: Remy Lefebvre
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Patent number: 5244356Abstract: A variable capacity hydraulic constant stroke piston apparatus has an annular rotor rotatably mounted for rotation around an axis of rotation and having a plurality of radial cylinder bores therein spaced at intervals therearound with working liquid inlets and outlets at the radially outer ends thereof, a rotor drive for rotating said rotor around the axis of rotation, an eccentric cam positioned within the rotor and movable along a circular locus of eccentric positions concentric with said axis of rotation; a device for fixing the eccentric cam at one of the plurality of eccentric positions and for moving the eccentric cam around the axis of rotation between said positions; a plurality of pistons radially reciprocally movably mounted in corresponding cylinder bores in the rotor, the pistons having heads normally contacting an outer periphery of the eccentric cam and moving through a constant length stroke at each position of the cam; and working liquid current rectifying means connected between the inlets anType: GrantFiled: October 30, 1992Date of Patent: September 14, 1993Assignee: Daiichi Electric Kabushiki KaishaInventor: Hisao Hasegawa
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Patent number: 5242275Abstract: A slant plate type refrigerant compressor, such as a wobble plate type refrigerant compressor, with a capacity or displacement adjusting mechanism is disclosed. The capacity adjusting mechanism includes a valve device having an expandable/contractable bellows responsive to crank chamber pressure and a valve element fixedly attached to one end of the bellows to directly control the closing and opening of a passageway which connects a crank chamber and suction chamber. The bellows has a first effective pressure receiving cross-sectional area responsive to crank chamber pressure. The valve element has a second effective pressure receiving cross-sectional area responsive to suction chamber pressure.Type: GrantFiled: June 22, 1992Date of Patent: September 7, 1993Assignee: Sanden CorporationInventors: Kiyoshi Terauchi, Hitoshi Azami, Shizuyoshi Watanabe
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Patent number: 5242279Abstract: A pump hose for a peristaltic pump has a suction-side end and a pressure-side end. Each end is provided with a bushing integrally connected thereto and adapted for suspending attachment to the peristaltic pump by holding members. Each bushing holds a suspension device having two side plates directed to opposite sides in symmetry with the longitudinal axis of the hose and each side plate is formed with an eyelet therein. The eyelets in the side plates on the suction-side end of the hose have a different form and/or size than the eyelets in the side plates on the pressure-side end of the hose. The eyelets are adapted for mounting on fitted holding pins of the pump. The hose can be easily mounted in the pump while conforming to the correct flow direction with respect to the suction side and the pressure side of the pump, and the pump hose offers uniform conveying characteristics.Type: GrantFiled: July 15, 1992Date of Patent: September 7, 1993Assignee: B. Braun Melsungen AGInventor: Reinhard Knuth
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Patent number: 5242274Abstract: A variable capacity type slant plate compressor including a crank chamber a suction chamber and a discharge chamber is disclosed. The crank chamber is linked by a first communication path to the suction chamber, and is linked by a second communication path to the discharge chamber. A first valve control mechanism is disposed within the first communication path. A second valve control mechanism is disposed within the second communication path. The first valve control mechanism controls the opening and closing of the first communication path so that the suction chamber pressure is maintained at a predetermined constant value. The second communication path is compulsorily opened by operation of the second valve control mechanism in response to an external signal so as to compulsorily minimize the capacity of the compressor.Type: GrantFiled: January 28, 1992Date of Patent: September 7, 1993Assignee: Sanden CorporationInventor: Atsuo Inoue
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Patent number: 5240390Abstract: An air control valve for directing air flow in a double-acting reciprocable motor, where the valve has a first link which is pivotally connected at one end to the motor and mechanically coupled along its length to a reciprocable motor member; a second link pivotally connected to the same point as the first link, and having an over-center spring detent mechanism to position it in either of two pivot positions; both of the links having alignable transverse slots, with a compression coil spring engaged in both slots; and a slide valve member attached to the second link and pivotally movable therewith, to direct the air flow into either of the double-acting motor drive members, the air valve toggling to its second position near the end of the motor drive stroke to cause the motor to reciprocate in the other direction.Type: GrantFiled: March 27, 1992Date of Patent: August 31, 1993Assignee: Graco Inc.Inventors: Daniel J. Kvinge, Marlin R. Melquist, Steve P. Plager
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Patent number: 5236311Abstract: A multi-stage compressor assembly including an arrangement for controlling the oil level having first and second capillary tubes. First capillary tube connects between the second stage high pressure housing at a level above the normal oil sump level to the first stage low pressure housing. The second capillary tube connects from the first stage housing at a point above the normal sump level to a point on the second stage suction tube. The oil level is automatically self compensating by the location of the capillary tube inlets and by differential housing pressure urging oil migration through the capillary tubes.Type: GrantFiled: January 9, 1992Date of Patent: August 17, 1993Assignee: Tecumseh Products CompanyInventor: Robert A. Lindstrom
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Patent number: 5234322Abstract: A proportioning pump for liquid additive metering having a housing with a diaphragm piston therein and inlet and outlet primary fluid lines to the housing and inlet and outlet valves in the housing for moving the piston up and down. A pair of additive pistons for pumping an additive liquid into the primary fluid with the additive pistons being moved by the diaphragm piston. An overcenter spring loaded connection connects the diaphragm piston to the inlet and outlet valves and a fail safe mechanism opens both the inlet and outlet valves in the event the spring in the overcenter connection fails. One of the additive pistons has an O-ring therein which acts as a seal and a check valve.Type: GrantFiled: December 24, 1992Date of Patent: August 10, 1993Assignee: Chemilizer Products, Inc.Inventors: Raymond R. Daniels, Norman W. Scheid, Donald C. Bryant
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Patent number: 5232352Abstract: A double diaphragm pump includes a connecting shaft for interconnecting the opposed diaphragms mounted in the pump body for reciprocal movement relatively thereof and a pilot valve sleeve telescoped over the shaft and movable axially in response to movement of the connecting shaft and having a plurality of axially directed circumferentially disposed recesses thereon for fluid transfer through the pilot valve cavity. A spool valve assembly is also carried by the body in a cavity which is in selected fluid communication with a source of air pressure, the pilot valve, the atmosphere and the pressure chambers of the pump. The pilot valve sleeve also has at least one projecting annular rib which engages the usual O-rings of the cavity in which the connecting rods and pilot valve sleeve reciprocate for assisting movement past the O-rings in response to pressure from the spool valve.Type: GrantFiled: April 6, 1992Date of Patent: August 3, 1993Assignee: Holcomb CorporationInventor: Ronald L. Robinson
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Patent number: 5231831Abstract: Variable turbocharger apparatus (2) comprising a compressor housing (64), a compressor (6) mounted for rotation in the housing (64), a turbine housing (4), a turbine (12) mounted for rotation in the housing (4), a first inlet (16) for enabling air to be conducted to the compressor (6), an outlet (18) for air from the compressor (6), a second inlet (20) for enabling exhaust gases from an engine to be conducted to the turbine (12), a chamber (22) which surrounds the turbine (12) and which receives the exhaust gases from the second inlet (20) before the exhaust gases are conducted to the turbine (12), a piston (24) which is positioned between the turbine (12) and the housing (4) and which is slidable backwards and forwards to form a movable wall separating the turbine (12) from the chamber (22) which surrounds the turbine (12), a bearing assembly (68) for allowing the rotation of the compressor (6) and the turbine, and a heat shield (201) for shielding the bearing assembly (68) from the exhaust gases, and the piType: GrantFiled: December 14, 1992Date of Patent: August 3, 1993Inventor: Malcolm G. Leavesley
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Patent number: 5232350Abstract: A motor mounted pump assembly for use with an agitator-type clothes washing machine is disclosed which includes a pump, having an impeller located in a pump housing, mounted to a motor casing such that a drive shaft from the motor extends into the pump housing and drivingly engages the impeller. Interposed between the pump and motor is a cover member which is fixedly secured to the pump housing and which is intended to divert any leakage from the pump housing from coming into contact with the motor or any associated electrical components of the washing machine. By fixedly securing the cover member to the pump housing, the pump and cover member may be removed from the motor as a unitary piece in the event the pump needs to be replaced or repaired. Furthermore, at the connection points between the cover member and the pump housing, the cover member is formed with embossed areas which function to divert any fluid leaking from the pump housing away from these areas.Type: GrantFiled: June 11, 1991Date of Patent: August 3, 1993Assignee: Maytag CorporationInventor: Curtis G. Richardson