With Guide Or Seal On Cylinder End Portion For Piston Or Member Moved By Piston Patents (Class 92/165R)
  • Patent number: 6162031
    Abstract: A seal assembly for a high pressure vessel. The pressure vessel can include a first material and can have a face with a bore extending through the face such that the bore has an edge at an intersection of the bore and the face. A check valve, including a second material, can extend into the bore and a seal seat, including a third material different than at least one of the first and second materials, can be positioned between the pressure vessel and the check valve body to reduce galling and/or fretting of the pressure vessel and check valve body.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: December 19, 2000
    Assignee: Flow International Corporation
    Inventor: Olivier L. Tremoulet, Jr.
  • Patent number: 6119581
    Abstract: A hand pump includes a cylindrical casing having a top open side covered with a top cover and a bottom side provided with an air outlet, a handle inserted through a hole the top cover, and a piston moved with the handle up and down to pump air out of the cylindrical casing through the air outlet, wherein the handle has multiple peripheral sides and angles defining a plurality of longitudinal grooves equiangularly spaced around the periphery for guiding outside air into the cylindrical casing evenly upon an up stroke of the handle, and a wedge-like coupling rod at a bottom end thereof press-fitted into a coupling hole at the piston for enabling the piston to be reciprocated with the handle.
    Type: Grant
    Filed: December 3, 1998
    Date of Patent: September 19, 2000
    Assignee: Ho Lee Co., Ltd.
    Inventor: Tsai Long Po
  • Patent number: 6113367
    Abstract: A cylinder is divided into two chambers by a wall to receive a pair of pistons. This reduces the stroke length and correspondingly reduces the linear speed of the piston. This leads to a reduced PV factor associated with degradation and wear of the piston rings. Moreover, the multi-cylinder arrangement provides the same performance in an oil-free compressor assembly without appreciably expanding dimensional constraints relative to known systems.
    Type: Grant
    Filed: August 25, 1999
    Date of Patent: September 5, 2000
    Assignee: AlliedSignal Truck Brake Systems Company
    Inventors: Valery Dunaevsky, Gene Gilbert
  • Patent number: 6105739
    Abstract: The invention relates to a guide bushing between two components axially movable relative to each other, especially for guiding a piston rod subjected to longitudinal and transverse forces in the region of a piston rod seal of a hydropneumatic vibration damper. The guide bushing encompasses the piston rod, is held axially in a piston rod guide and is made of a material having good gliding characteristics. The guide bushing is arranged in the piston rod guide with a radial clearance having a gap with a changeable width when the piston rod is subjected to transverse forces created between the receptacle diameter of the piston rod guide and the outer diameter of the guide bushing.
    Type: Grant
    Filed: February 26, 1998
    Date of Patent: August 22, 2000
    Assignee: Mannesmann Sachs AG
    Inventor: Norbert Deppert
  • Patent number: 6089141
    Abstract: The straightness of the piston of a water jet loom plunger pump for discharging water under a high pressure is maintained to allow its smooth movement with respect to the cylinder. For this, a roller guide is arranged at a reciprocal piston actuating mechanism unit. By forming a bent tube at a water discharging passage from the cylinder to a conduit, moreover, the resistance to the water to be discharged from the cylinder is reduced. The piston is given a degree of freedom to move with respect to a drive member connected to a pump cam and a lever. This enables the piston to move with the least resistance in the cylinder.
    Type: Grant
    Filed: January 15, 1998
    Date of Patent: July 18, 2000
    Assignee: Hokuriku Seikei Industrial Co., Ltd.
    Inventor: Masahiro Okesaku
  • Patent number: 6085635
    Abstract: The invention relates to a safety device for pneumatic actuators, for preventing the actuator pinion from being violently ejected, comprising a circular seat, formed on the less diameter portion of the pinion, projecting from the actuator body, and housing a resilient ring element. The resilient ring element engages with the pinion restraining elements, provided on the less diameter portion of the pinion outside of the actuator body, for a time required for allowing the pressure inside the actuator body to be released, through a slot defined about the pinion larger diameter section because of the disengagement of the corresponding sealing gasket from the actuator body.
    Type: Grant
    Filed: April 8, 1998
    Date of Patent: July 11, 2000
    Inventor: Giovanni Trevisan
  • Patent number: 6076645
    Abstract: A hydraulically controlled disconnect system for a friction clutch of motor vehicles is provided and is constructed as a slave cylinder which includes a pressure housing (2) which is arranged concentrically in relation to a gear box input shaft (3). A guiding sleeve is arranged radially apart from the pressure housing to create a circularly configured pressure chamber (9) in which a ring piston (7) is axially guided and movable. A reinforced seal (8a) on the pressure chamber side of the ring piston (7). The seal (8a) includes sealing lips (14, 15) which are arranged radially spread apart. In accordance with the invention, the reinforcement (18a) of the seal (8a) is held form-locking on the ring piston (7) with a degree of axial and radial freedom.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: June 20, 2000
    Assignee: INA Walzlager Schaeffler oHG
    Inventors: Ludwig Winkelmann, Harald Peschke
  • Patent number: 6073538
    Abstract: A reciprocating compressor in which the piston is axially movable within a cylindrical cavity formed on an aluminium cylinder; the piston being provided with a sealing element made from composite plastics material, an oil-scraper element made from cast iron, and a guide element made from composite plastics material; the sealing element being disposed in a first seat formed in the side wall of the piston close to an upper surface of the piston, the guide element being disposed in a second seat formed in the side wall of the piston close to a lower edge of the piston, and the oil-scraper element being disposed in a third seat formed in the side wall of the piston between the first and second seats.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: June 13, 2000
    Inventor: Giordano Tomesani
  • Patent number: 6052993
    Abstract: An actuator of the thermal type has a body, wherein a chamber is defined for containing a material which expands as a function of the temperature of said body; a shaft, having one end directly dipped into said material, the shaft being movable as a function of the increase and decrease of volume of said material; a closure and sealing device for the chamber and the shaft, including at least a closure element, configured as a washer or similar element, which is apt to cooperate mechanically with said body, at least a first sealing element, such as a bushing or similar element, which is apt to perform a first sealing on said shaft, and at least a second sealing element, such as a ring or similar element, which is apt to perform a second sealing on said shaft.
    Type: Grant
    Filed: March 4, 1999
    Date of Patent: April 25, 2000
    Assignee: Eltek S.p.A
    Inventors: Costanzo Gadini, Renato Gaj
  • Patent number: 6016738
    Abstract: Piston compressor for compressing gas, comprising a frame with at least one cylinder which has an essentially horizontal axis, a piston which is reciprocable in the cylinder, a piston rod which at one end thereof is fixed to the piston, while the other end thereof is coupled to a crosshead which is guided in the frame and is reciprocable by a drive mechanism, and bearing means which support the piston/piston rod unit, formed by the piston and the piston rod connected thereto, relative to the frame.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: January 25, 2000
    Assignee: Thomassen International B.V.
    Inventors: Johannes Jacobus Elferink, Laurentius G.M. Koop, Renatus J.M. Schutte
  • Patent number: 6015273
    Abstract: An electromagnetic reciprocating compressor has a body (1, 2), a piston (10) reciprocating in the body, and an electromagnetic drive (22, 23, 24) for the piston. The piston has a piston head (11) which slides in a cylinder (12) in the body to effect compression of fluid in the cylinder during operation of the compressor and, axially spaced from the piston head, a piston guide member (13) slidingly movable on a guide surface (14) provided by the body. The compressor has a compression spring arrangement (20) comprising at least one helical compression spring (20a, b) acting to drive the piston axially. The spring (20a, b) is mounted around the piston and is at least partly located within the cylinder during at least part of the piston stroke but is outside the working volume of fluid undergoing compression.
    Type: Grant
    Filed: July 10, 1997
    Date of Patent: January 18, 2000
    Assignee: Pegasus Airwave Limited
    Inventors: Angus Patrick Douglas Hannagan, Michael Alan McGrath
  • Patent number: 6014924
    Abstract: A slide drive device has a principal housing, in which at least one actuating element able to be driven linearly is arranged. Externally on the principal housing there is a slide kinetically coupled with the actuating element. Two stroke limiting means render possible a variable preset of the two end positions of the slide and each comprise an adjustable arranged on the one part and a counter-abutment arranged opposite to same on the other part. The one adjustable abutment is arranged on the slide and the other adjustable abutment is located on the principal housing. Both abutments are provided in end regions facing in the same axial direction, on the slide and, respectively, on the principal housing.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: January 18, 2000
    Assignee: Festo AG & Co.
    Inventors: Kurt Stoll, Uwe Modinger, Dieter Waldmann
  • Patent number: 5934173
    Abstract: An improved reciprocating plunger pump boasting a self-aligning plunger assembly, a selectively removable plunger guide cartridge, and an improved seal cartridge assembly.
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: August 10, 1999
    Assignee: Hypro Corporation
    Inventors: Edward P. Murphy, Frank L. Amyotte
  • Patent number: 5927178
    Abstract: A hydraulic actuator for a hydraulically driven device has a hydraulic cylinder, a first piston slidably received for reciprocation within the cylinder and defining a hydraulic fluid chamber with the cylinder, a second piston slidably received for reciprocation within a cavity in an actuator rod connected to the first piston and defining a gas chamber on one side of the second piston and an accumulator chamber on the other side of the second piston. A passage formed in the first piston communicates the hydraulic chamber with the accumulator chamber and a pressure relief valve selectively permits hydraulic fluid flow through the passage from the hydraulic chamber to the accumulator chamber to limit the maximum pressure of the hydraulic fluid within the hydraulic chamber and the hydraulically driven device. Preferably, during normal operation of the actuator and the hydraulically driven device the pressure of the hydraulic fluid is less than that required to open the pressure relief valve.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: July 27, 1999
    Assignee: Diebolt International, Inc.
    Inventor: Sven Stenquist
  • Patent number: 5921167
    Abstract: In space exploration, an attitude control engine or a thruster may have an extended period, such as years, of inactivity prior to being required to complete a desired mission. The fuel for this mission is contained in a fuel tank for the same extended period of time and tends to corrode elastomeric components. To isolate the fuel from elastomeric components during the storage period, the fuel tank has a metallic shear seal. When actuated, a piston ruptures the shear seal and delivers the fuel to a power plant. A shear seal that is unitary with the inner walls of the fuel tank eliminates the need for an interfacial weld that may constitute a shear seal failure site.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: July 13, 1999
    Assignee: Primex Aerospace Company
    Inventors: Phillip J. Giesy, Charles J. Henniger, Jeffrey C. Maybee
  • Patent number: 5921166
    Abstract: A cylinder apparatus including a piston slidably fitted in a cylinder having a hydraulic fluid sealed therein. A piston rod is connected at one end thereof to the piston. The other end portion of the piston rod extends as far as the outside of the cylinder through a seal block fitted to an open end portion of the cylinder. The seal block retains a double seal including a rod seal that is in sliding contact with the piston rod and an O-ring that resiliently biases the rod seal toward the piston rod. The seal block is provided with a projection extending between the O-ring and the rod seal to bear a part of biasing force applied to the rod seal from the O-ring. The projection is provided at a side of the O-ring and rod seal which is remote from the piston.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: July 13, 1999
    Assignee: Tokico, Ltd.
    Inventors: Hiromi Machida, Tetsuo Katoh, Yasuo Inose, Hiroshi Murata
  • Patent number: 5916350
    Abstract: A bearing assembly for a piston rod of a linearly reciprocating piston type engine having a cylinder (11), a piston (12) movable axially in cylinder (11), at least one piston rod (13) secured to and projecting axially from one side of the piston to be received in a respective bearing assembly (17) mounted in a cover assembly at one end of the cylinder and which guides the movement of the piston/piston rod assembly, said bearing assembly comprising: an inner annular array of balls (18) which roll on the cylindrical outer surface of the piston rod (13) during its reciprocation, and housed in an annular space defined between the cylindrical outer surface of rod (13) and a sleeve (19); bearings (20) which rotatably mount sleeve (19); and means for rotating the sleeve (19) about the axis of the piston rod (13) so as to apply continuous rotation to the balls during each cycle of reciprocation of the piston rod and thereby enable a hydrodynamic lubrication of the bearing assembly.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: June 29, 1999
    Assignee: Carding Specialist Limited
    Inventor: John Maximillian Jules Varga
  • Patent number: 5865089
    Abstract: A linear thruster is disclosed in which a load beam is linearly moved relative to a guide beam by fluid power. One or both of the beams are multisided in cross-section to substantially increase the linear bearing area between the beams and substantially increase the strength of the linear thruster against side forces as well as moments while permitting a substantial reduction in the volumetric space consumed by the linear thruster. The fluid power and the energy inputs to the linear thruster may all be positioned at one end of the guide beam.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: February 2, 1999
    Inventors: John W. Langer, Michael T. Starr
  • Patent number: 5848880
    Abstract: A high-pressure plunger pump assembly, in particular for working pressures above 2000 bar, includes a housing, a cylinder received in the housing and defining a working space which has an expanded area along a section thereof for receiving a sleeve therein, and a plunger slidably moveable in the working space of the cylinder and in the sleeve and being suitably operated by a drive for reciprocating movement. The sleeve has one end closer to the plunger drive and formed with an annular flange. A suction valve communicates with the cylinder for admitting fluid from a suction chamber into the working space, and a pressure valve communicates with the cylinder for expelling fluid from the working space during a pressure stroke of the plunger, with a seal being positioned in a transitional area from the annular flange to the cylinder between the working space and the suction chamber.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: December 15, 1998
    Assignee: Paul Hammelmann Maschinenfabrik GmbH
    Inventor: Burkhard Helmig
  • Patent number: 5839888
    Abstract: A pump system has first and second pumps. Each pump has a housing, which housing has an inboard end and an outboard end. The pumps are arranged so that the inboard ends are adjacent to each other. The inboard ends each have a crankshaft, while the outboard ends each have an output manifold. Each crankshaft is connected to a plunger by way of a connecting rod and a crosshead. The crosshead reciprocates inside of a cylinder. The crosshead has an axis that is coplanar with a rotational axis of the crankshaft. The connecting rod is connected to the crosshead by way of a wrist pin. The wrist pin is offset from the cylinder axis in order to allow the respective pump to be compact in length. The first and second pumps are on a trailer. In the first pump, the wrist pin is offset on one side of the respective cylinder axis, while in the second pump, the wrist pin is offset on the opposite side of the respective cylinder axis.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: November 24, 1998
    Assignee: Geological Equipment Corp.
    Inventor: Curtis Harrison
  • Patent number: 5806747
    Abstract: In a combustion-powered, fastener-driving tool with a combustion chamber, a piston chamber communicating with the combustion chamber, a driving piston movable within the piston chamber between an initial position and a terminal position, and a driving blade mounted to the driving piston so as to be conjointly movable with the driving piston, the driving piston, the driving blade, and the piston chamber are arranged so that combustion in the combustion chamber imparts energy to the driving piston and the driving blade so as to drive the driving piston and the driving blade from the initial position toward the terminal position with the driving blade preceding the driving piston, over a stroke having a length sufficient to enable the driving blade to transfer more than eight tenths of the maximum, transferable energy to a fastener engaged by the driving blade as the driving piston and the driving blade approach the terminal position. The piston chamber has an inner, cylindrical wall.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: September 15, 1998
    Assignee: Illinois Tool Works Inc.
    Inventors: Donald L. Van Erden, Kui-Chiu Kwok, G. Michael Velan
  • Patent number: 5806314
    Abstract: A pressure-driven cylinder having a piston sliding within a sealed housing chamber between a pair of opposed side-end walls in a piston chamber. At least one chamber wall has a moveable portion of an end wall integrally connected to and axially spaced away from a pressure-driven face of the piston by an integral connector point that is much smaller in area than the piston's pressure face. That moveable wall portion acts as an integrally connected piston follower that has its own extended surface area that is progressively introduced into the presure chamber as the piston slides in order to reduce the required volume of pressurized driving fluid in the piston chamber. A chamber for the follower itself is sealably isolated from the piston chamber so that no driving fluid backs into the follower chamber. Both the end wall/follower and the piston reciprocate together.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: September 15, 1998
    Assignee: Joseph F. Younes
    Inventor: Joseph F. Younes
  • Patent number: 5806406
    Abstract: A hydraulic cylinder, comprising a cylindric tube (10) with two end covers (11, 12). One of the end covers (11) is provided with an opening for a piston rod (13) connected to a piston (14) which is displaceable between the end covers. The end covers (11, 12) are on one hand connected to the tube (10) via a screw joint (15, 16), on the other are provided with channels (18) for inlet and outlet of a hydraulic medium, to and from the respective spaces between the piston (14) and the end covers (11, 12). Each end cover (11, 12) comprises an outer member (19, 20) and an insert member (21, 22). The channels (18) for the hydraulic medium extend through the outer member (19, 20) and the insert member (21, 22).
    Type: Grant
    Filed: December 13, 1996
    Date of Patent: September 15, 1998
    Assignee: AB Multidock Hydraulic
    Inventor: Thomas Pettersson
  • Patent number: 5791233
    Abstract: The invention relates to a novel design of a lifting column, especially for patient tables or for industrial applications, with at least one lifting cylinder designed as a hydraulic cylinder at least for one vertical stroke and with at least one guide assigned to at least one lifting cylinder for guidance in the direction of the stroke of the lifting cylinder.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: August 11, 1998
    Inventors: Jurgen Michael Knapp, Robert Geiger
  • Patent number: 5787791
    Abstract: An actuator for a turbocharger includes a housing having a chamber therein, a piston assembly having a rod and a piston secured to a rod for axial movement therewith, a spring operatively interposed between the piston and the housing for urging the piston upward within the chamber. A hollow retainer is mounted to the housing and extends into the chamber alongside the piston. The retainer has a housed portion having a generally cupped shape with a cavity therein for receiving a pressure signal from the turbocharger. The retainer has axially spaced first and second peripheral protrusions thereon. An O-ring mounts on the retainer between the first and second protrusions and in engagement with the retainer and piston simultaneously. The O-ring rolls between the first and second protrusions in response to the pressure signal and the resulting relative axial movement between the retainer and piston, thus decreasing hysteresis in the actuator.
    Type: Grant
    Filed: March 20, 1997
    Date of Patent: August 4, 1998
    Assignee: Gits Manufacturing Company
    Inventor: Mark W. Vertanen
  • Patent number: 5782162
    Abstract: A guide (30) for surrounding and sealing a rod (26) in the end of a hydraulic cylinder (12) including a piston (24) slidably disposed in the cylinder (12) and attached to the end of the rod (26) and a method for manufacturing the guide (30). The guide (30) includes an inner guide bore (38) with dovetail shaped channels (40) extending annularly about the guide bore (38) and an organic polymeric bearing material (42) disposed in the guide bore (38) in mechanically interlocking engagement with the dovetail channel in the radial direction to exert a radial retaining force from the channel (40) to the bearing material (42) to establish a force fit in the radial direction between the channel (40) and the bearing material (42) placing the guide (30) in a mold (44, 46) defining a cylindrical cavity extending about the guide bore (38) and between the end faces (32) of the guide (30).
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: July 21, 1998
    Assignee: Dynamic Seals Incorporated
    Inventors: Eddy R. Lanteigne, Dwain L. Chalker, Terrance W. Rudd, Roger R. Schumacher
  • Patent number: 5778759
    Abstract: A piston pump having structure to maintain substantially parallel alignment of a piston rod and a crosshead extension as a crosshead slide undergoes wear. The structure includes a slot defined by the end of the piston rod for receiving a male pilot of the crosshead extension. In a further embodiment, the piston rod has a male pilot and the end of the crosshead extension defines a slot for receiving the male pilot of the piston rod. The slot may be oblong in a direction transverse to the longitudinal axis of the piston rod. The structure may additionally or alternatively include a centering sleeve attached to the outer surface of the piston rod adjacent to and coaxial with the piston. A backflushing system may be used with the sleeve to keep the piston, piston sleeve, and pump cylinder cool. One such system has a conduit connected to the sleeve and in liquid communication with an annular cavity between the sleeve and the pump cylinder to circulate coolant therethrough.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: July 14, 1998
    Assignee: Phoenix Energy Products, Incorporated
    Inventor: Jerry E. Johnson
  • Patent number: 5771775
    Abstract: A compressor has a front housing, cylinder block and a rear housing. The housings and cylinder block are secured to one another by a plurality of bolts. A plurality of pistons reciprocally move in cylinder bores to compress gas. Each of said bolts has a shaft extending through the housings and the cylinder block. A cam plate is supported on a drive shaft for integral rotation therewith to convert the rotation of the drive shaft to reciprocal movement of a piston in the cylinder bore. The piston rotates about its axis in accordance with rotation force transmitted from the cam plate and abuts against the shaft of the bolt, which extends in close proximity to the piston. The rotating piston abuts against the shaft so that the rotation thereof is restricted. The shaft has a diameter greater than that of a threaded portion formed at an end of the bolt. Since the threaded portion is smaller, the threaded portion does no damage to the piston during assembly.
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: June 30, 1998
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Masaki Ota, Kazuya Kimura, Hiroaki Kayukawa
  • Patent number: 5765666
    Abstract: A suspension strut comprises inner and outer tubes and incorporates an end closure constituted by a moulded plastic insert containing a sleeve bearing in the form of a metal bush, the insert being a press fit into the outer tube of the strut and the press fit region of the insert including a portion adapted to engage with and locate in a radial direction the inner tube of the strut, together with at least two circumferential ribs which extend radially from the insert to engage the inner surface of the outer tube, the material of said ribs being in compression, with said ribs being spaced apart axially of the strut to confer a degree of resilience onto the assembly and a fluid seal being provided at or adjacent the outer face of the end closure to minimize fluid losses from the strut along the relatively movable rod thereof.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: June 16, 1998
    Assignee: Glacier Vandervell SA
    Inventors: Marc Provence, Jean-Louis Ligier
  • Patent number: 5761985
    Abstract: A fluid power cylinder comprises a terminally arranged piston rod guide device through which a guide station of the piston rod with a prismatic cross section runs. Two diametrally opposite prism side edges of the guide section fit into circumferentially extending guide grooves in a plurality of guide rollers, the surface sections, which laterally adjoin prism side edges, of the guide section being supported by the flanks of the guide grooves.
    Type: Grant
    Filed: November 5, 1996
    Date of Patent: June 9, 1998
    Assignee: Festo KG
    Inventor: Kurt Stoll
  • Patent number: 5738000
    Abstract: An axial piston machine includes a housing and a rotary shaft is mounted in the housing. A plurality of radially spaced cylindrical bores are arranged concentrically around the shaft and a reciprocal piston is located in each bore. A plate is located at an angle of inclination with respect to the rotary shaft. Each piston is connected to the plate by a support body locator and first and second support bodies are located in the support body locator and are in contact with the opposed surfaces of the plate.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: April 14, 1998
    Assignee: Linde Aktiengesellschaft
    Inventor: Franz Forster
  • Patent number: 5720215
    Abstract: A piston (40) for use in a compressor housing (10) having a cylindrical inner surface (12) with an anti rotation wing (42) of improved design. The outer surface of the piston anti rotation wing (42) includes a pair of spaced, semi cylindrical pads (48), each with a radius substantially equal to the compressor housing inner surface (12). Each pad (48) is located on the anti rotation wing (42) such that, when the winG (42) is centered, the inner edge of each pad (48) is radially spaced slightly from the housing inner surface (12), and each pad is eccentric relative to the center of the compressor housing surface (12). When the anti rotation wing (42) turns in either direction, one pad (48) or the other contacts the housing inner surface (12) concentrically, making continuous supporting contact.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: February 24, 1998
    Assignee: General Motors Corporation
    Inventors: David Jared Asplund, David Michael Ebbing
  • Patent number: 5704274
    Abstract: An axial piston machine has a rotary shaft, a first group of concentric radially spaced cylindrical bores, and a second group of concentric radially spaced cylindrical bores axially spaced from and aligned with said first group of cylindrical bores. A wobble plate is located between the groups of cylindrical bores and is positioned at an angle relative to the axis of rotation of the rotary shaft and is connected to said rotary shaft. A piston is located in each pair of cylindrical bores for reciprocal movement, and each piston includes two axially spaced piston segments and a bridge segment connecting the piston segments and attaching the piston segments to the wobble plate. Each bridge segment has a guide which is effective in the peripheral direction to contact a corresponding guide on adjacent bridge segments to prevent rotation of the pistons.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: January 6, 1998
    Assignee: Linde Aktiengesellschaft
    Inventor: Franz Forster
  • Patent number: 5704461
    Abstract: Rotational control apparatus (A) in the preferred forms of fan clutches is disclosed including shoulder bolts (78) extending through axially extending voids (146) formed in axially extending portion (66) and flange (76) of first and second shell housings (62, 68). The shoulder bolts (78) secure the shell housings (62, 68) together to prevent relative movement therebetween. The apparatus (A) further includes a piston (80) having tabs (144) extending from the outer periphery thereof into the voids (146) and including openings having bushings (134) therein for slideable receipt on the shoulder bolts (78). Springs (138) are mounted on standoffs (210) extending in the voids (146) and abutting with the shoulder of the shoulder bolts (78).
    Type: Grant
    Filed: July 17, 1995
    Date of Patent: January 6, 1998
    Assignee: Horton, Inc.
    Inventors: Rick Vatsaas, Virgil Schieffer, Tom Bydalek, Todd Smith
  • Patent number: 5701798
    Abstract: The linear actuating device of the present invention has a rodless power cylinder unit with a cylinder barrel. An external carriage is disposed on the cylinder barrel and is movable along the axis of the cylinder barrel. A base on which a guide rail is mounted is provided. A slide table is driven by the external carriage of the rodless power cylinder unit and guided by the guide rail. According to the present invention, the external carriage is disposed on the side of the cylinder barrel facing the guide rail. This construction allows the external carriage and the slide table to be accommodated within the height of the cylinder barrel. Therefore, the height of the linear actuating device as a whole can be reduced to substantially the same as the height of the cylinder barrel.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: December 30, 1997
    Assignee: Howa Machinery, Ltd.
    Inventor: Mitsuo Noda
  • Patent number: 5676038
    Abstract: Piston rods are coupled to respective pistons movably disposed respective cylinder chambers defined in a cylinder body. The piston rods have distal ends connected to an end plate mounted on a slide table which is mounted for movement along a guide rail. When the piston rods are displaced by the pistons, the slide table is also displaced axially of the cylinder body. When the slide table is positioned at either end of its stroke, a load is applied by the weight of a workpiece supported on the slide table and the weight of the slide table itself to the cylinder body through the guide rail. The slide table is thus prevented from being unduly flexed under the load. The length of the slide table can be set to a desired length irrespective of an increase in the displacement of the slide table. Even if the displacement of the slide table is increased, the slide table is not flexed and hence remains highly rigid against flexure.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: October 14, 1997
    Assignee: SMC Kabushiki Kaisha
    Inventors: Masayuki Hosono, Hiroshi Miyachi, Toshio Satou
  • Patent number: 5655496
    Abstract: An engine which employs a cam follower mechanism to reduce wear and reduce the size of an assembled engine. The cam follower mechanism utilizes guide rails located to reduce side thrust on the valve stem. The engine employs a high speed quill shaft to synchronize independent cam shafts existing in each of a plurality of interconnected engines. The engine is assembled using a single size fastener to provide a uniform stress gradient within the engine. The engines are interconnected utilizing O-ring seals. The engine provides a piston crown utilizing a connecting rod directly connected to the bottom surface of the piston crown. The piston crown is stabilized along the longitudinal cylinder axis by a rail guide. Connecting rods are provided which require less than one hundred eighty degrees (180.degree.) circumference of a crankshaft pin for support so that a plurality of connecting rods can be associated with a single crankshaft pin.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: August 12, 1997
    Assignee: Evestar Technologies, Inc.
    Inventor: Alex Pong
  • Patent number: 5651302
    Abstract: 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 guides (6, 8) in sliding contact with guide cylinders (7, 9) in the cylinder housing are parallel to the travel guides. The colinear pistons and travel guides are attached to pump bases (10, 11) at opposite ends of the travel guides. Inward-pressured rings (14, 26), outward-pressured rings (29), fluid conveyances (16, 19, 30, 31), valves (36) and attachment components (21) for reciprocative actuation are provided selectively for particular design requirements.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: July 29, 1997
    Assignee: Fabco Air, Inc.
    Inventor: Douglas W. Mills
  • Patent number: 5632191
    Abstract: The invention relates to a hydraulic mechanism comprising: a cam; a cylinder block; cylinders formed in the cylinder block; pistons slidably mounted in the cylinders; thrust rollers for the pistons acting on the cam and axially defined by two transverse faces; two wedging parts for each roller, each wedging part being disposed in a recess between the end face of the roller and the inside face of the cylinder, thereby holding the roller in position, one of the wedging parts extending to the bottom portion of the recess and including a groove parallel to the axis of the piston, and a projection that is fixed relative to the cylinder being received in the groove.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: May 27, 1997
    Assignee: Poclain Hydraulics
    Inventors: Gilles Lemaire, Alain Noel
  • Patent number: 5623967
    Abstract: Piston boxes are attached to both ends of a valve body of a main valve segment having multiple ports and an axial valve port. Projections extending toward the valve port are provided in piston chambers provided in the piston boxes. The pistons have pressing tips to push the valve member and recesses and adapted to accommodate the sliding projections. The relative motion between the projections and recesses guide the slide of the pistons.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: April 29, 1997
    Assignee: SMC Corporation
    Inventor: Bunya Hayashi
  • Patent number: 5617772
    Abstract: A linear actuator has an actuator body having a through hole defined axially therein and an opening defined in an upper surface thereof, a pair of end blocks, a slide table reciprocally movable in the directions indicated by the arrows X, Y, a pair of cylindrical members coupled to the end blocks, respectively, and having respective passages communicating with fluid outlet/inlet ports, respectively, defined in the actuator body, a joint member movable in unison with the slide table, a pair of cover members held in surface-to-surface contact with the joint member in confronting relation to each other and hermetically surrounding outer circumferential surfaces of the cylindrical members, for sliding displacement in unison with the slide table, and a pair of pressure chambers defined by the cylindrical members and the cover members and closed by the cover members, the pressure chambers communicating with passages in the cylindrical members.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: April 8, 1997
    Assignee: SMC Kabushiki Kaisha
    Inventors: Masayuki Hosono, Yoshiteru Ueno
  • Patent number: 5615598
    Abstract: A jack consists of a body of the jack (2) sliding on a fixed piston (9) mounted on a support (6) by means of a piston rod (4), and at least one element for guiding the body on the support. The body of the jack is an extruded section (2) containing at least one longitudinal bore (3) used as the piston chamber for the jack, and equipped with at least two guide rods (5) mounted on the section (2) in the longitudinal direction. Bearings (15) adapted to the shape of the guide rods (5) are mourned on the fixed support (6). At least one of the bearings is adjustable. Advantageously, the extruded section (2) is equipped with two hydraulic shock absorbers intended to contact limit stops (21). Limit stops (21) have adjustable positions, and can be retracted and fixed on an L-shaped groove (20) of the fixed support (6).
    Type: Grant
    Filed: June 21, 1995
    Date of Patent: April 1, 1997
    Assignee: Parker Hannifin RAK SA
    Inventors: Jean-Marie Noroy, Franck Roussillon
  • Patent number: 5615599
    Abstract: A piston-type compressor has a compressor housing enclosing a crank chamber, suction chamber, and a discharge chamber. The compressor housing also includes a cylinder block having at least two cylinders. A single head-type piston is slidably disposed within each of the cylinders. A drive shaft is rotatably supported in the cylinder block. A plate is tiltably connected to the drive shaft. A bearing couples the plate to the pistons, so that the pistons are driven in a reciprocating motion within the cylinders upon rotation of the plate. A piston guiding mechanism has a first guiding device which is formed on the peripheral of the piston, and a second guiding device which is disposed within the housing for guiding the first guiding device to slide smoothly along the second guiding device and to prevent the piston from rotating around its axis or radially inclining when the piston reciprocates in the cylinder.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: April 1, 1997
    Assignee: Sanden Corporation
    Inventor: Kiyoshi Terauchi
  • Patent number: 5579876
    Abstract: A stopper for a hydraulic dashpot for a motor vehicle. The dashpot essentially comprises a piston and cylinder. The cylinder is occupied by fluid and is divided into two chambers by a piston. The piston is mounted on the end of a rod that travels into and out of the cylinder. The stopper is mounted at the end of the cylinder the piston rod travels in and out of. The stopper accommodates seals and several annular components, and at least one of the annular components is attached to the wall of the cylinder. The stopper has an annular component in the shape of a cup at the piston-rod entry-and-exit end. The base of the cup-shaped annular component extends radially inward and has a circular hole at the center. The piston rod extends through the hole. The side of the cup-shaped annular component extends toward the interior of the cylinder. The cup-shaped annular component also accommodates an annular piston-rod aligning component that is at least partly surrounded by the cup-shaped annular component.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: December 3, 1996
    Assignee: August Bilstein GmbH & Co. KG
    Inventors: Adolf Adrian, Rolf Angermann
  • Patent number: 5572921
    Abstract: Disclosed is an improved hydraulic lift system comprising a cylinder housing preferably in the shape of a regular polygon which applies compressive force to a cylinder within the cylinder housing. This cylinder is preferably made from extruded plastic. Within the cylinder is a three ringed piston to which is attached a piston rod. The piston rod is adapted for connection to a horizontal cantilevered arm assembly.The improved lift permits cantilevered transport from specially designed handicapped chairs and stretchers for access to and egress from a pool or spa.
    Type: Grant
    Filed: February 22, 1995
    Date of Patent: November 12, 1996
    Assignees: Keith Krumbeck, Cindy Krumbeck
    Inventor: Keith Krumbeck
  • Patent number: 5570769
    Abstract: A rotary actuator and a linear actuator are combined to provide an output shaft with independent linear and rotary motion. The linear actuator causes the rotary actuator to move linearly, and there is a guide which restricts the movement of the rotary actuator to linear motion and a bearing which receives the output shaft of the rotary actuator to prevent orbiting and deflection of the rotary output shaft.
    Type: Grant
    Filed: January 30, 1995
    Date of Patent: November 5, 1996
    Assignee: Turn Act, Inc.
    Inventors: Fred C. Eicher, Charles F. Evans, Gary M. Rumrill
  • Patent number: 5570622
    Abstract: A guide rod extends longitudinally through the power piston of a vacuum power booster providing lateral support thereto and tying the master cylinder housing to a bracket on the rear of the power booster housing. A guide rod provides a means of positively laterally supporting the power piston, control valve and push rods of the power booster thereby providing the ability to reduce the relative supportive strength of the housing, housing divider and piston bearings.
    Type: Grant
    Filed: June 8, 1995
    Date of Patent: November 5, 1996
    Assignee: General Motors Corporation
    Inventors: Jeffrey A. Heinrichs, Craig A. Osterday, Timothy A. Haerr, Neal B. Rosenblum, Joseph S. Kramer
  • Patent number: 5555789
    Abstract: A linear motion device having an elongated body a carriage moveable in a linear path relative to the body and a bearing positioned between the carriage and body for supporting the carriage for movement along the linear path. The bearing includes a side rail adjustably connected to the body and bearing elements between the carriage and the side rail.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: September 17, 1996
    Assignee: Tol-O-Matic, Inc.
    Inventors: Gary W. Rosengren, Philip M. Poeschl
  • Patent number: 5544565
    Abstract: A servo for operating a brake band in an automatic transmission includes a transmission casing defining a cylinder, a servo piston supported for displacement within the cylinder, a piston stem defining a locking shoulder, a compression spring fitted over the piston stem, and a spring retainer fitted over the piston stem of the spring defining a shoulder resiliently engaging the shoulder formed on the piston stem.
    Type: Grant
    Filed: March 6, 1995
    Date of Patent: August 13, 1996
    Assignee: Ford Motor Company
    Inventor: Joseph S. Van Selous
  • Patent number: 5537912
    Abstract: A rodless cylinder has adjusting mechanisms, each comprising a gear shaft rotatably mounted in a hole defined in an outer wall of a slide table and having a first gear on an end thereof, an adjustment shaft having a second gear on an end thereof which is held in mesh with the first gear at a predetermined angle, and a rod coupled to an opposite end of the adjustment shaft out of alignment with a central axis of adjustment shaft, with a guide roller being rotatably supported on the rod. When the gear shaft is turned by a screwdriver bit inserted in the hole, the adjustment shaft is turned to displace the guide rod for optimum rolling contact with a rail on a cylinder tube. The rolling contact between the guide rod and the rail can be adjusted from the outer side of the slide table.
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: July 23, 1996
    Assignee: SMC Kabushiki Kaisha
    Inventors: Michikazu Miyamoto, Tadashi Saito, Naoki Hoshi