Materials Digest Patents (Class 417/DIG1)
  • Patent number: 6082495
    Abstract: A scroll-type machine is disclosed which incorporates a lubricant impregnated drive bushing. The lubricant utilized for the impregnation process will preferably be of a type which is insoluble in the fluid being handled by the scroll-type machine, will remain trapped in the pores of the drive bushing under normal operating temperatures as well as any temperatures encountered during manufacturing processes to which the assembled compressor may be subjected yet will wick out of the bushing when its temperature increases such as may occur when insufficient lubricant is being supplied thereto by the normal lubrication system.
    Type: Grant
    Filed: February 25, 1998
    Date of Patent: July 4, 2000
    Assignee: Copeland Corporation
    Inventors: David L. Steinbarger, Aelred F. Pereira
  • Patent number: 5902096
    Abstract: An integral valve diaphragm pump has a first rigid layer, a second rigid layer and a flexible membrane therebetween. Concave surfaces in the two rigid layers form a pump. The pump includes an actuating chamber which is alternately connected to a source of pressure and a source of vacuum. A pump chamber is connected to a fluid source and a fluid receiver through a filling check valve and a dispensing check valve, respectively. Duckbill and spring loaded ball check valves are disclosed.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: May 11, 1999
    Assignee: Bayer Corporation
    Inventors: Bruce E. Behringer, James A. Mawhirt
  • Patent number: 5876190
    Abstract: A vacuum membrane pump includes a housing, a membrane and a head portion having a sealing surface which engages with a sealing edge of the membrane to form a seal. A pump chamber is formed between the head portion and the membrane. The head portion is cast from glass, and has at least one penetrating opening for accommodating a valve element on the side away from the pump chamber. The membrane rests with its sealing edge on a shoulder of the housing and, with the sealing edge, engages with the sealing surface of the head. The valve element is in turn engaged with the inside of the openings of the head. A closure connected to the housing delivers an axial force to the valve element. The valve element, the head, and the membrane are pressed together to form a sealed assembly.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: March 2, 1999
    Assignee: Buchi Labortechnik AG
    Inventor: Arthur Spring
  • Patent number: 5806336
    Abstract: There are provided a highly durable and efficient refrigerating apparatus and a lubricating oil composition that uses an HFC type refrigerant and is still free from the problem of thermal hydrolysis of polyol-ester type oil and resulting generation of carboxylic acid and sludge so that the refrigerating apparatus and the lubricating oil composition may be used stably for a prolonged period of time. A lubricating oil composition according to the invention comprises as base oil components a polyol-ester type oil formed by reacting specific polyhydric alcohol with a fatty acid, to which tricresylphosphate and epoxy compound comprising glycidyl ether or carbodiimide are added at respective specific rates.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: September 15, 1998
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Takashi Sunaga, Yoshinobu Obokata, Masazo Okajima, Takeo Komatsubara, Yasuki Takahashi
  • Patent number: 5671656
    Abstract: An improved fluid section for piston type paint pumps having the piston made from unplated stainless steel and wherein the seal is a multiple lip type formed of ultra-high molecular weight polyethylene and the seal further includes one or more U-shaped internal stainless steel springs.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: September 30, 1997
    Assignee: Wagner Spray Tech Corporation
    Inventors: Norman A. Cyphers, Frank G. Mirazita
  • Patent number: 5669764
    Abstract: An integral valve diaphragm pump has a first rigid layer, a second rigid layer and a flexible membrane therebetween. Concave surfaces in the two rigid layers form a pump. The pump includes an actuating chamber which is alternately connected to a source of pressure and a source of vacuum. A pump chamber is connected to a fluid source and a fluid receiver through a filling check valve and a dispensing check valve, respectively. Duckbill and spring loaded ball check valves are disclosed.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: September 23, 1997
    Assignee: Bayer Corporation
    Inventors: Bruce E. Behringer, James A. Mawhirt
  • Patent number: 5649813
    Abstract: Insulation is provided in the form of wall insulation, piston or diaphragm insulation and/or piston rod and/or diaphragm washer insulation to increase the temperature in the working air chamber of an air motor of the piston or diaphragm type to reduce the formation of ice on exhaust.
    Type: Grant
    Filed: August 7, 1996
    Date of Patent: July 22, 1997
    Assignee: Ingersoll-Rand Company
    Inventors: Stephen D. Able, Douglas D. Purdy, Nicholas Kozumplik, Jr.
  • Patent number: 5622479
    Abstract: A device (10), and a method for forming such a device (10), for a fluid system for a vehicle, comprises first and second members (12, 13). The first member (12) is adapted for direct mounting on the chassis or engine of a vehicle (11); the second member (13) defines at least part of a leak tight fluid chamber (15) of the device (10). The first member (12) is of a thermoset material suitable for withstanding operating conditions and loads associated with direct mounting of the device (10) on the chassis or engine (11), and the second member (13) is of a thermoplastic material suitable for welding to ensure leaktightness of a fluid chamber (15). The second member (13) is interlocked with the first member (12) during moulding thereof.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: April 22, 1997
    Assignee: WABCO Automotive UK Limited
    Inventor: Stephen R. Earle
  • Patent number: 5611681
    Abstract: A pump for pumping shear sensitive material comprising a housing having an internal displacement chamber and a displacement rod. The displacement rod is reciprocable within the displacement chamber and the displacement chamber having an aperture through which the displacement rod is reciprocated. The aperture being sealed with respect no the displacement chamber by the displacement rod and an annular seal surrounding the displacement rod. The displacement chamber having an inlet opposite the aperture and an outlet radially disposed to the longitudinal axis of the displacement rod and in close proximity to the annular seal.
    Type: Grant
    Filed: April 6, 1995
    Date of Patent: March 18, 1997
    Assignee: Hydrair Limited
    Inventor: David G. Everitt
  • Patent number: 5607291
    Abstract: A closed compressor includes a closed vessel made of steel and a vapor-liquid separator connected to the closed vessel. The closed vessel and the vapor-liquid separator have a discharge steel pipe and a suction steel pipe, respectively, each of which has a hexagonal portion and a threaded portion for connection with an aluminum pipe. The closed compressor of this construction is suited for use in an automotive air conditioner.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: March 4, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Keisuke Morita, Hiroshi Matsunaga, Shigeru Muramatsu, Shinji Fujiwara
  • Patent number: 5573385
    Abstract: The present invention provides an improved design for a mechanical pump. The pump is a dual chamber design typically including a pair of expandable bellows driven in a reciprocating fashion by a supply of pressurized air. The use of expandable bellows reduces wear on the pump thereby lengthening the required maintenance intervals in comparison with dual chamber diaphragm pumps previously known. Additionally, the pump is easily disassembled for inspection, cleaning or maintenance. Furthermore, the high strength of the pump's design makes it possible to manufacture the pump entirely of corrosion resistant materials.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 12, 1996
    Assignee: Asti SAE
    Inventor: Yves Chevallier
  • Patent number: 5567131
    Abstract: A valve assembly is disclosed for an oscillating pump of the type having a reciprocating armature carrying an impeller that defines a pump chamber for flow of fluid through the pump. The valve assembly includes a valve body mounted to the impeller, a valve seat attached to the valve body, a spring retainer, a spring mounted to the spring retainer and a plug located between the spring and the valve seat. The valve assembly provides a substantially fluid tight seal when the pump is discharging fluid and allows fluid to enter the pump chamber when the pump is suctioning. All wetted components are particularly suitable for corrosive fluids, such as acids.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: October 22, 1996
    Assignee: Gorman-Rupp Industries
    Inventor: Michael H. McNaull
  • Patent number: 5547351
    Abstract: A diaphragm pump which provides a low internal volume and minimizes volume contributions for applications which require the transfer of fluid volumes on the order of one to several microliters. The pump includes a plunger which reciprocates within a bore and applies fluid pressure to a diaphragm of a head cavity that is connected to the cylinder bore. Hydraulic feed and vent passages connect to the cylinder bore at a point where the end of the plunger passes during reciprocal movement to ensure that the amount of hydraulic fluid within the cylinder bore is consistent during each stroke of the plunger. The pump is particularly useful for supplying receptor media to a Franz cell.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: August 20, 1996
    Assignee: The United States of America as represented by the Secretary of the Department of Health and Human Services
    Inventor: James P. Hanus
  • Patent number: 5531574
    Abstract: A closed-type compressor includes a closed casing accommodating an electric motor from which a rotational shaft extends and a compressing machine to be operated by the motor and the compressing machine is of a reciprocating-type and provided with sliding portions. A hydrofluorocarbon (HFC) refrigerant is used as a compressor refrigerant, and a refrigerator oil consisting essentially of ester is used as a lubricating oil. The sliding portions of the compressing machine each is formed of two members one of which is made of cast iron subjected to an insoluble film forming process using manganese phosphate and another one of which is made of carbon steel.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: July 2, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hisanori Honma
  • Patent number: 5509789
    Abstract: Single-stage liquid ring gas pump which can be flanged to a drive unit. The suction and delivery connections are disposed on a connection casing (3) which is to be connected to the drive unit. On the side of the connection casing remote from the drive are disposed a plate cam (4) and a working chamber casing (5) together with the impeller (14) rotating in the latter. The impeller sealingly cooperates on its open end face with the plate cam and on its largely closed end face (19) with an end wall (7) of the working chamber casing (5). The working chamber casing is in the form of a deep-drawn sheet metal part and has no medium connections. For the purpose of connection to the connection casing or the plate cam, it is provided with a radial connection flange (6). The transition from the cylindrical part to the connection flange (6) of the working chamber casing (5) is rounded on the inside such that the gap remaining between this rounding and the plate cam remains below a particular size.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: April 23, 1996
    Assignee: Sihi GmbH & Co KG
    Inventors: Udo Segebrecht, Klaus Domagalla
  • Patent number: 5494420
    Abstract: A self-aligning connection between a rotary and reciprocating pump piston allows relative radial movement between the pump piston and the rotary cam. The self-aligning connection is formed by a pin carried by the rotary cam and is positioned in a radial recess located in the pump piston. An improved drive for the rotary cam is perfected by a cam follower pin supported from the housing by a roller bearing race which is pressed fitted within a bore formed by the pump housing. The pump piston abuts a TEFLON pad located in the pump cylinder to reduce dead space and insure that the pump produces accurate volumes. The employment of different plastic materials between the rotary cam and the pump housing provides an improved bearing surface.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: February 27, 1996
    Assignee: Diba Industries, Inc.
    Inventors: James A. Mawhirt, Jack M. Olich, Mark Huza
  • Patent number: 5489195
    Abstract: Liquid-ring gas pump with a working chamber in which an impeller (6) rotates and which is bounded axially by a control plate (7) past which the impeller (6) moves with a small clearance and which has at least one intake and/or discharge opening (21, 22, 23) and is composed of rolled sheet. According to the invention, the edges (26) of the intake and discharge openings are at least in part bent over towards the side facing away from the impeller (6) and are rounded on the side facing the impeller and raised on the side facing away from it.
    Type: Grant
    Filed: September 21, 1994
    Date of Patent: February 6, 1996
    Assignee: SIHI GmbH & Co KG
    Inventors: Klaus Domagalla, Siegfried Auschrat
  • Patent number: 5480292
    Abstract: The present invention provides an improved design for a mechanical pump. The pump is a dual chamber design typically including a pair of expandable bellows driven in a reciprocating fashion by a supply of pressurized air. The use of expandable bellows reduces wear on the pump thereby lengthening the required maintenance intervals in comparison with dual chamber diaphragm pumps previously known. Additionally, the pump is easily disassembled for inspection, cleaning or maintenance. Furthermore, the high strength of the pump's design makes it possible to manufacture the pump entirely of corrosion resistant materials.
    Type: Grant
    Filed: May 19, 1993
    Date of Patent: January 2, 1996
    Assignee: ASTI SAE
    Inventor: Yves Chevallier
  • Patent number: 5397220
    Abstract: A canned motor pump having an enclosing casing on the inside of a stator and a rotor on the inside of the enclosing casing, in which the interior parts of the enclosing casing communicates with the interior parts of a pump. Surfaces of supported portions on a shaft of the rotor which are contacted with the liquid flowing on the inside of the enclosing casing are treated by electrolytic polishing so that a liquid liable to polymerization or an adherent liquid can normally circulate as a circulating liquid for cooling a motor, and furthermore supporting portions which support the shaft contain bearings produced from fluororesin or glass-fiber reinforced fluororesin.
    Type: Grant
    Filed: August 5, 1993
    Date of Patent: March 14, 1995
    Assignees: Nippon Shokubai Co., Ltd., Teikoku Electric Manufacturing Co., Ltd.
    Inventors: Kazumi Akihisa, Takehiro Takashima
  • Patent number: 5378114
    Abstract: A gas fuel injection pump including a pump body machined with a plurality of plunger sliding bores, the pressure head of which has side entry ingress passages and individual and separate discharge ports; including a means to actuate the plungers consisting of a rotating cam-spool suitably keyed and locked to the axial driven shaft which will connect by suitable means to the engine crankshaft so as to ensure the precise timing of the injection process. The plungers are sealed by rings of polyamide resin to obviate the leakage of any gas and also to act as sliding bearing surfaces to provide working clearances betwixt plunger and bore. Cam followers are interposed between the plungers and cam-spool to control sidethrust and ensure a satisfactory and maintenance free operation.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: January 3, 1995
    Inventor: William H. Howe
  • Patent number: 5338151
    Abstract: A unit for delivery of fuel from the fuel tank to the internal combustion engine of a motor vehicle includes a feed pump which is arranged in the fuel tank and constructed as a flow pump with substantially circular-cylindrical impeller driven in rotation in a correspondingly circular-cylindrical pump chamber. In at least one of the two chamber end walls, at least one approximately annular delivery duct which is groove-like in cross section extends from a suction opening which opens into the pump chamber to a pressure opening leading out of the latter. This end wall of the chamber is penetrated in the region of the pressure opening by a bore hole connecting the pump chamber with a region of the system in which low pressure prevails.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: August 16, 1994
    Assignee: Robert Bosch GmbH
    Inventors: Ulrich Kemmner, Kurt Frank, Michael Niederkofler
  • Patent number: 5273410
    Abstract: A refrigerant compressor for using HFC 134a as a refrigerant and a refrigerator oil such as polyether type oil, polyester type oil, or the like which is compatible thereto is disclosed. The refrigerant compressor has a iron type substrate with a compound layer mainly made of iron sulfide on sliding portions such as sliding parts and shaft in the compression mechanism. The sliding parts in the compression mechanism are a cylinder and a rotor and a piston which are moving parts. In a rotary type compressor, the sliding parts are a blade and so forth. The hardness of the compound layer mainly made of the aforementioned iron sulfide is large and thereby effectively preventing metals from being contacted and preventing adhesive abrasion which is the primary cause of the abrasion of the sliding portions.
    Type: Grant
    Filed: August 5, 1992
    Date of Patent: December 28, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shoichiro Kitaichi, Tadao Machida, Shinobu Sato
  • Patent number: 5240387
    Abstract: A variable capacity vane compressor includes a bearing arrangement having a radial bearing radially supporting a drive shaft of the compressor, and a thrust bearing rotatably supporting a capacity control element. The bearing arrangement comprises an annular member fixed in a through hole formed through a side block of the compressor, through which the drive shaft extends. The annular member has an inner peripheral surface in which the radial and thrust bearings are received. The annular member is formed of a material having a coefficient of thermal expansion substantially equal to that of a material forming the radial bearing. The thrust bearing has a first race disposed on a side thereof close to a rotor of the compressor, and a second race disposed on a side remote from the rotor. The first race is force-fitted in a through hole formed through the capacity control element and slidably fitted in the inner peripheral surface of the annular member.
    Type: Grant
    Filed: May 7, 1992
    Date of Patent: August 31, 1993
    Assignee: Zexel Corporation
    Inventors: Nobuyuki Nakajima, Tatsuo Nakaya
  • Patent number: 5192200
    Abstract: A reed valve for a hermetic compressor, comprising a cylinder block (1) having a pair of opposite faces; a cylinder (C) formed in said cylinder block (1) and housing a piston (2); at least one end plate (3) having an outer face (3a) and an inner face (3b) fixed to one of the opposite faces of the cylinder block (1), in order to close a respective end of the cylinder (C), and being provided with at least one pair of axial gas passages (6, 7) communicating the interior of the cylinder (C) with the outer face (3a) of the end plate (3) through a respective read valve (10), which is fixed to the face (3a) of the end plate (3), to which is opened the outlet end (6b, 7b) of the respective gas passage (6, 7), said valve comprising a blade element (10) with a body being formed of a resin that is preferably plastic and reinforced with fiber filaments (20, 21, 22) spaced from each other according to at least one direction relative to the longitudinal axis of the blade element (10).
    Type: Grant
    Filed: June 7, 1991
    Date of Patent: March 9, 1993
    Assignee: Empresa Brasileira de Compressores S/A-Embraco
    Inventors: Dietmar E. B. Lilie, Jose L. Driessen, Marcio L. Todescat, Manfred Krueger
  • Patent number: 5141416
    Abstract: A method of manufacturing a plunger for a downhole reciprocating oil well pump for use in sandy environments including the step of machining a metal plunger to the required base configuration with an external cylindrical pump surface having a diameter of about 0.025 inches less than the design diameter, grit blasting the plunger cylindrical pump surface to achieve a textured surface thereon, heating the plunger, flame spraying a thin layer of ceramic composite on the plunger cylindrical pump surface, repeating the flame spraying steps sequentially until the diameter of the cylindrical pump surface having the ceramic composite thereon is about 0.015 to 0.020 inches above the design diameter, cooling the plunger and grinding the ceramic covered plunger pump surface to the design diameter.
    Type: Grant
    Filed: February 14, 1991
    Date of Patent: August 25, 1992
    Assignee: Dover Resources, Inc.
    Inventors: Michael L. Cognevich, Shannon B. Sixkiller
  • Patent number: 5131818
    Abstract: A high-pressure water pump of the reciprocating piston type has its metal ston reciprocatable in a cylinder bushing composed of PEEK base high-strength thermoplastic synthetic resin and constructed so as to define a cooling clearance between the piston and the cylinder designed to prevent the temperature of the bushing on continuous operation from rising above 100.degree. C. The piston shoe and the slide bearing for the eccentric shaft should also be a PEEK based resin which can have a filler of carbon fibers, PTFE, glass fibers and/or mineral.
    Type: Grant
    Filed: June 18, 1991
    Date of Patent: July 21, 1992
    Assignee: Hauhinco Maschinenfabrik G. Hausherr, Jochums GmbH & Co. KG
    Inventors: Wolfram Wittkop, Ulrich Samland
  • Patent number: 5110463
    Abstract: A slurry filter apparatus in which a pump mechanism having a valve and a valve seat, each of which is made of a wear-resisting metal material, is capable of moving a slurry of high density and containing hard particles, under pressure, the flow of slurry being injected so as to strike the face of the filter at an a predetermined, non-tangential angle. Coarse particles contained in the slurry are uniformly dispersed by the shearing forces due to cavitation generated through the high pressure injection of the slurry and abrupt speed changes of the flow of slurry. A caked layer of particular material is thereby prevented from forming on the surface of the filter.
    Type: Grant
    Filed: February 1, 1990
    Date of Patent: May 5, 1992
    Assignee: Fuji Filter Kogyo Kabushiki Kaisha
    Inventors: Takahashi Yuichi, Azuma Katsuji
  • Patent number: 5108270
    Abstract: A fluid handling apparatus having a casing constructed of a conductive corrosion resistant plastic material formed from acetal resin impregnated with conductive stainless steel wool. When grounded through use of a convenient bonding strap, the apparatus eliminates the buildup of electrostatic charge which may occur in combustible fluid transfer.
    Type: Grant
    Filed: July 27, 1990
    Date of Patent: April 28, 1992
    Assignee: The Aro Corporation
    Inventor: Nicholas Kozumplik, Jr.
  • Patent number: 5047287
    Abstract: A diaphragm, suitable for use in automotive applications, which comprises a base fabric having bonded to at least one surface a fluororubber layer by an adhesive which includes an acrylonitrile-butadiene or acrylonitrile-isoprene rubber having an amino group. There is also a described a method of making the diaphragm.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: September 10, 1991
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Noriyuki Horiuchi, Hiroyuki Kobayashi
  • Patent number: 5033940
    Abstract: The compressor comprises at least one high-pressure cylinder and piston unit having a piston which is guided in a cylinder liner and which is coupled with a crankshaft by way of a connecting element guided in the cylinder casing along the longitudinal axis of the cylinder. The piston is coupled with the connecting element by way of a mounting permitting movements of the connecting element relatively to the piston transversely of the longitudinal axis. Guidance of the piston is achieved without affect from oscillations of the connecting. The piston cooperates with the liner to bound a lubricant-free annular gap open over the whole longitudinal portion common to the liner and the piston. A dry gap ring seal can therefore be provided between the piston and the liner and ensures that the compression chamber remains seal tight even at pressures of above 60 bar. Preferably, the piston and the cylinder liner are each made of wear-resistant metal or ceramic material.
    Type: Grant
    Filed: January 18, 1990
    Date of Patent: July 23, 1991
    Assignee: Sulzer Brothers Limited
    Inventor: Heinz Baumann
  • Patent number: 5022829
    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.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: June 11, 1991
    Assignee: The BOC Group plc
    Inventor: Gerrit De Haan
  • Patent number: 5021151
    Abstract: A semi-conductor etching system includes a tub for holding a corrosive fluid that is maintained at an elevated temperature and a weir basket which is located in the tub and is also adapted to hold the corrosive fluid. A pump and filtration unit is located in the tub and includes a one piece corrosion and high temperature resistant housing having a pump chamber, a filter chamber spaced from the pump chamber, an inlet port for allowing fluid to flow into the housing and an outlet port for allowing fluid to flow out of the housing. A fluid passage is provided in the housing for allowing fluid to flow between the pump chamber and the filter chamber. A pump impeller is housed in the pump chamber of the unit and a filter is housed in the filter chamber. The housing and the pump impeller include a plastic material which can withstand the corrosive action of the high temperature corrosive fluid. A pipe communicates the pump and filtration unit outlet port with the weir basket.
    Type: Grant
    Filed: May 12, 1989
    Date of Patent: June 4, 1991
    Inventor: Daryl J. Yane
  • Patent number: 5013219
    Abstract: A high pressure, positive displacement piston pump for pumping a corrosive fluid is disclosed. The pump includes a pump body having a plurality of cylinders therein, each provided with an inlet and an outlet. A suitable one-way valve device is disposed in a connection between the inlet and the cylinder, and another oppositely directed one way-valve device is disposed in a connection betweenn the outlet and each cylinder. A piston is disposed in each cylinder for reciprocal movement therein in order to pump the fluuid from the inlet to the outlet. A cam device moves each piston reciprocally and includes a rotating member having a first camming surface which is cylically rotated adjacent an end of each piston. At the end of each piston, a second camming surface is provided which engages the first camming surface. A cooling system is also provided for cooling and lubricating the first and second camming surfaces with a coolant liquid in contact with the bearing surfaces within the pump.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: May 7, 1991
    Assignee: The University of Delaware
    Inventors: Douglas C. Hicks, Charles M. Pleass
  • Patent number: 4996085
    Abstract: Mechanical devices having relatively moving parts subject to galling or scoring by contact of the parts are effectively repaired by coating the surfaces to be treated with a composition comprising a hardenable epoxy resin, a reinforcing filler, and an amount of an agent such as graphite or molybdenum disulfide capable of reducing the coefficient of friction of the said composition.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: February 26, 1991
    Inventor: G. Kelly Sievers
  • Patent number: 4990067
    Abstract: A hermetic compressor according to the present invention has an improved operating efficiency for use in a cold storage chamber, freezing chamber or the like . The compression includes a suction pipe which is formed by a material having heat conductivity lower than that of a casing of the hermetic compressor so that heat of the closed casing is not easily transmitted to the suction pipe. In this manner heating of the drawn in cooling medium gas is inhibited, and thus, cooling efficiency can be improved by preventing discharge of a low density cooling medium into the cooling system through compression of the expanded cooling medium gas.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: February 5, 1991
    Assignee: Matsushita Refrigeration Company
    Inventors: Hiroshi Sasano, Hideki Kawai, Toshihiko Ohta
  • Patent number: 4870827
    Abstract: A durable low weight compressor having improved performance is disclosed. The compressor includes a fiber reinforced resin matrix composite housing and a fiber reinforced glass marix composite compression chamber liner. An air conditioner including an improved compressor is also disclosed.
    Type: Grant
    Filed: August 12, 1987
    Date of Patent: October 3, 1989
    Assignee: United Technologies
    Inventors: David J. McFarlin, Antonio B. Caruolo, Eric Minford, Karl M. Prewo
  • Patent number: 4861395
    Abstract: Austenitic cast iron has excellent corrosion resisting properties and has been preferentially used in machines or machine parts intended for handling corrosive fluids such as seawater. Cases, however, have been reported of machines or machine parts made of austenitic cast iron failing after they had been put to prolonged service at relatively low temperatures. The present inventors have located stress corrosion cracking at the cause of this failure.In accordance with the present invention, methods of using salt water resisting machines or machine parts made of austenitic cast iron that has graphite in the form of spheroids or nodules and which comprises by weight %: C.ltoreq.3.0, Si=1.0-3.0, Mn.ltoreq.1.5, P.ltoreq.0.08, Ni>24-28%, Cr.ltoreq.5.5 and the balance being Fe to minimize stress corrosion are provided.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: August 29, 1989
    Assignee: Ebara Corporation
    Inventors: Matsuho Miyasaka, Katsuhiro Ichikawa, Katsumi Sasaki, Syotaro Mizobuchi, Naoaki Ogure
  • Patent number: 4854825
    Abstract: A vacuum pump includes two pairs of piston and cylinder assemblies mounted on opposite sides of a crankshaft in a common plane with the gas inlets for the first and second cylinders of a first pair of piston and cylinder assemblies being connected to the device to be evacuated and the gas outlets thereof being connected to a common outlet having a spring biased one-way valve controlling the outlet and to a passage connected to the inlet of a third cylinder in said second pair of piston and cylinder assemblies. The gas outlet of the third cylinder is connected to the inlet of the fourth cylinder and the gas outlet of the fourth cylinder is connected to the common outlet through spring biased one-way valves.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: August 8, 1989
    Assignee: Commonwealth Scientific and Industrial Research Organization
    Inventors: Eckhard Bez, John L. Farrant
  • Patent number: 4842498
    Abstract: A diaphragm compressor composed of non-metallic parts capable of being manufactured and assembled so inexpensively as to be suitable for one-time use. Conventional expensive fasteners such as screws are eliminated and assembled parts are joined by press fitting, sonic welding or similar inexpensive functionally similar means.
    Type: Grant
    Filed: April 28, 1988
    Date of Patent: June 27, 1989
    Assignee: Thomas Industries, Inc.
    Inventors: David Bramstedt, Roy J. Rozek
  • Patent number: 4834625
    Abstract: An improved fluid pump provided with a ceramic encasement that substantially reduces noise and vibration, resulting in improved acoustic characteristics.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: May 30, 1989
    Assignee: Grant Airmass Corporation
    Inventor: Benton H. Grant
  • Patent number: 4808092
    Abstract: The pump head liner of a small-size precision reciprocating metering pump, which has its application particularly in High Performance Liquid Chromatography (HPLC), is made of transparent material, preferably of synthetic sapphire or monocrystalline zirconium oxide. A pump head casing is designed such that a pump head liner is visually accessible. Cartridge-type check valve units abut onto the pump head liner on the one side, and onto a connecting adapter piece featuring an elbow liquid duct on the other. Pre-loading pressure for liquid sealing is exerted onto the connecting adapter piece by means of a compression screw which is secured in a clamp bracket or L-shaped angled clamping piece. The cartridge-type check valve units can be composed of transparent components and thereby are visually accessible.
    Type: Grant
    Filed: January 6, 1987
    Date of Patent: February 28, 1989
    Assignee: Saphirwerk Industrieprodukte
    Inventor: Herbert Funke
  • Patent number: 4806083
    Abstract: An expanded foam material surrounds a relatively thin, metallic motor casing and forms a housing which supports the motor while providing a seal to preclude leakage of liquids into the motor casing and to prevent discharge of dielectric oil from the interior of the motor casing. During manufacture of the pump, the casing is placed within a mold and a portion of the mold structure complementally and firmly engages four radially spaced regions of the generally cylindrical motor casing. Next, a quantity of the initially pourable foam material is introduced into the space between the mold and the casing, and the material self-expands to a solidified, cured condition in firm, surrounding engagement with the motor casing.
    Type: Grant
    Filed: October 21, 1986
    Date of Patent: February 21, 1989
    Assignee: The Marley-Wylain Company
    Inventors: Nyle D. LaGrange, Darryl M. Nielsen, Terry A. Peterson
  • Patent number: 4793875
    Abstract: Disclosed is an abrasion corrosion resistant casting alloy which is readily machinable and of an approximately 50/50 mixture of austenite and ferrite obtained by uniquely heat treating a new thirty percent (30%) chromium, five percent (5%) manganese, three percent (3%) silicon, two percent (2%) molybdenum, one and one half percent (11/2%) copper plus additions of titanium, vanadium, carbon and nitrogen.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: December 27, 1988
    Assignee: Ingersoll-Rand Company
    Inventor: John A. Larson
  • Patent number: 4792289
    Abstract: In a reciprocating pump for cryogenic fluids comprising a pump cylinder in which a piston is oscillatingly displaceable in a sealed state, an inlet valve and an outlet valve, and an annular channel surrounding the pump cylinder on the outer side and forming an outlet for the cryogenic fluid delivered by the pump, in order to attain optimum sealing at the operating temperatures, without the piston motion being impeded at higher temperatures, it is proposed that the cylinder be made of a material with good sliding and self-lubricating properties and a thermal expansion coefficient which is larger than that of the piston, that the dimensions of the cylinder and the piston be so selected that the piston sealingly contacts the inside wall of the cylinder at operating temperature, and that the outlet valve be arranged at the downstream end of the annular channel.
    Type: Grant
    Filed: June 17, 1987
    Date of Patent: December 20, 1988
    Assignee: Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt e.V.
    Inventor: Willi Nieratschker
  • Patent number: 4790726
    Abstract: A reciprocatory piston and cylinder machine particularly suitable for use as a vacuum pump includes a cylinder (17), a cylindrical piston (16) relatively slidably reciprocable within the cylinder (17), and means for substantially sealing the annular space between the piston (16) and cylinder (17) in lieu of oil or other liquid lubricant. The sealing means comprises a sleeve (102) of a low-friction material disposed under circumferential tension, and preferably also under longitudinal tension, on the cylindrical surface of the piston (16). Also disclosed is a reciprocatory piston and cylinder machine of particular prior construction having a one-way valve (42) in an exhaust port (30) ahead of a head portion (24) of the piston (16). The arrangement is such that, as the front face of the piston head portion (24) approaches the closed cylinder end (52), the piston head portion 24 physically moves the one-way valve (42) so as to open the exhaust port (30).
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: December 13, 1988
    Assignee: Commonwealth Scientific and Industrial Research Organization
    Inventors: Guenter K. W. Balkau, Eckhard Bez, John L. Farrant
  • Patent number: 4777834
    Abstract: The invention relates to a method for determining a composite material constitutive of moving parts in a hermetically sealed refrigerating compressor, wherein a composite material, of which the initial mechanical and thermal properties fulfull the conditions corresponding to the mechanical and thermal stresses in compressors, is placed during a first determined test period T1 in an environment containing the chemical products that are present in a compressor, at a test temperature equivalent to the maximal operating temperature of a compressor, and wherein at the end of this period, its chemical and mechanical properties are measured, and compared with the initial mechanical or chemical properties, and it is assessed by calculation what such properties would become once the material would have been used in an environment of a compressor during a second period T2, longer than the first test period T1, and wherein this material is thus utilized for producing parts provided the assessed properties satisfy the re
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: October 18, 1988
    Assignee: L'Unite Hermetique
    Inventor: Serge Vendittelli
  • Patent number: 4763563
    Abstract: A swash plate (3) incorporated in a swash plate type compressor and comprising a boss (10) typically formed of aluminum material, which is fixedly secured on a drive shaft (2), and a swash plate assembly (11) extending obliquely from the boss (10), which assembly comprises a pair of front and rear contact plates (12) made of iron and brought into contact with a pair of shoes (6) which are accommodated in recesses (15a) of a piston (5), a connecting member (13) made of iron rigidly connecting the pair of contact plates (12), and a filler (14) made of aluminum material which completely fills the internal spaced formed between the contact plates (12).
    Type: Grant
    Filed: November 18, 1987
    Date of Patent: August 16, 1988
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Hayato Ikeda, Masayuki Kurahashi, Fukuo Gomi
  • Patent number: 4701110
    Abstract: In a swash-plate type rotary compression, a pair of cylinder blocks are formed of an aluminum alloy containing 16 to 20 weight % silicon. A ring made of a synthetic resin having wear resistance and slidability is fitted in a ring groove formed in a sliding surface of each of pistons which is brought into sliding contact with the corresponding cylinder bore, or a coating layer formed of a ferrous metal is provided on the above sliding surface. A drive shaft is fitted in a central bore in each of the cylinder blocks such that radial load exerted by the drive shaft is directly borne by an inner peripheral surface of the central bore, and an oil passageway supplies lubricating oil to a clearance between an outer peripheral surface of the drive shaft and the inner peripheral surface of the central bore.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: October 20, 1987
    Assignee: Diesel Kiki Co., Ltd.
    Inventor: Takeo Iijima
  • Patent number: 4699572
    Abstract: A reciprocatory piston and cylinder machine particularly suitable for use as a vacuum pump includes a cylinder (17), a cylindrical piston (16) relatively slidably reciprocable within the cylinder (17), and means for substantially sealing the annular space between the piston (16) and cylinder (17) in lieu of oil or other liquid lubricant. The sealing means comprises a sleeve (102) of a low-friction material disposed under circumferential tension, and preferably also under longitudinal tension, on the cylindrical surface of the piston (16). Also disclosed is a reciprocatory differential piston and cylinder machine of particular prior construction having a one-way valve (42) in an exhaust port (30) ahead of a head portion (24) of the piston (16). The arrangement is such that, as the front face (28) of the piston head portion (24) approaches the cylinder end face (52), the front face (28) physically moves the one-way valve (42) so as to open the exhaust port (30).
    Type: Grant
    Filed: January 21, 1986
    Date of Patent: October 13, 1987
    Assignee: Commonwealth Scientific and Industrial Research Organization
    Inventors: Guenter K. W. Balkau, Eckhard Bez, John L. Farrant
  • Patent number: 4688999
    Abstract: A well pump includes a piston and an inlet and/or outlet valve assembly of special structure. Each is formed of a body of organic polymer, preferably PTFE. Each includes a cavity in its upper portion and at least one passage leading from the cavity to the bottom of the block. A screen covers each cavity and a valve disk covers each screen. Flexible sealing flanges extend upwardly and downwardly from the periphery of the piston block. The outlet valve block has a sliding block and sealing fit with the piston rod.
    Type: Grant
    Filed: April 8, 1986
    Date of Patent: August 25, 1987
    Assignee: Battelle Devepment Corporation
    Inventors: Kenneth R. Ames, James M. Doesburg