To Provide Unequal Inlet And Exhaust Flow Rates To Single Working Chamber Patents (Class 91/443)
  • Patent number: 11378193
    Abstract: A diverter/mixing valve is provided that includes a main outer housing and a barrel assembly disposed inside the main outer housing. When actuated, an actuator rotates the barrel assembly between an open end inlet position where a first fluid stream flows into a first inlet port and a second fluid stream is blocked from flowing into a second inlet port, and an open side inlet position where the second fluid stream flows into the second inlet port and the first fluid stream is blocked from flowing into the first inlet port.
    Type: Grant
    Filed: June 22, 2020
    Date of Patent: July 5, 2022
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: Heinrich Gerhardt, Adam M. Poost
  • Patent number: 10550864
    Abstract: A telescopic hydraulic cylinder is disclosed which has automatic air bleeding and fluid flushing features. A method of removing air from a hydraulic cylinder is also disclosed. A hydraulic circuit with for removing air from a hydraulic cylinder is further disclosed.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: February 4, 2020
    Assignee: Innovative Hydraulics, LLC
    Inventors: Thomas Joseph Collins, Aaron William Smith
  • Patent number: 10480542
    Abstract: A valve system for use with a cylinder having an extensible rod, includes a first valve assembly including a first inlet/outlet port, a check valve biased toward a closed state, the check valve having a check valve body at least partially receivable within a first port of the cylinder, a flow control valve positioned in series between the first inlet/outlet port and the check valve, and a first pilot port selectively communicable with a pressurized gas for opening the check valve. The valve system further includes a second valve assembly including a second inlet/outlet port, a second pilot port through which the pressurized gas must flow before being introduced to the first pilot port, and a valve body at least partially receivable within a second port of the cylinder, wherein the second inlet/outlet port and the second pilot port are integrally formed as a portion of the valve body.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: November 19, 2019
    Assignee: Aladdin Engineering and Manufacturing, Inc.
    Inventors: Natalie E. Bell, Edward R. Horn, David M. Matz, Gregory F. Matz, Scott R. Jones, Edward C. Horn
  • Patent number: 10058308
    Abstract: A method for operating a biopsy apparatus includes providing a cannula having a lumen, a proximal portion, a closed distal end, and an orifice located on a circumferential surface of the cannula, the orifice being configured to receive a tissue sample into the lumen of the cannula; providing a cutting sheath coaxially disposed with the cannula, the cutting sheath being configured to be movable relative to the cannula to selectively cover the orifice; providing a pressure chamber coupled to the proximal portion of the cannula, the pressure chamber configured to contain a pressure; providing a bifurcated valve assembly interposed between the cannula and the pressure chamber, the bifurcated valve assembly having a first valve and a second valve; operating the first valve to release the pressure into the lumen of the cannula; and operating the second valve to facilitate an inflow of air into the pressure chamber.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: August 28, 2018
    Assignee: C. R. Bard, Inc.
    Inventors: Adam B. McCullough, Robert W. Kalis
  • Patent number: 9194099
    Abstract: An implement system for a machine having a stick member with a nose end and a mounting bracket is disclosed. The implement system includes a thumb pivotally connected to the nose end of the stick member, and a thumb actuator operatively connected between the mounting bracket of the stick member and the thumb to move the thumb between a fully retracted position and a fully extended position. The implement system has one or more of an RTK Factor, a TP Ratio and an ITO Ratio having values within ranges that allow installation of the implement system with the thumb actuator connected the thumb either directly or by a linkage assembly without changing the position of the mounting bracket on the stick member.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: November 24, 2015
    Assignee: Caterpillar Inc.
    Inventors: Ryan Patrick Shea, Aaron Dean Kovar
  • Patent number: 9085873
    Abstract: A hydraulic system includes a first hydraulic circuit and a second hydraulic circuit. The first hydraulic circuit includes a hydraulic cylinder assembly, a pressurized fluid source, a fluid tank, and a metering control valve. The hydraulic cylinder assembly includes a cylinder, a rod, a head end including a head pressure, and a rod end including a rod pressure. The metering control valve includes a rod extension position, and a rod retraction position, and is fluidly connected to the head end, the rod end, the fluid source, and the fluid tank. The second hydraulic circuit includes a second circuit valve assembly selectively fluidly connected to the head end, the rod end, and the fluid tank.
    Type: Grant
    Filed: December 23, 2011
    Date of Patent: July 21, 2015
    Assignee: Caterpillar Inc.
    Inventor: Magomed O. Gabibulayev
  • Patent number: 8549983
    Abstract: Provided is a hydraulic drive including a double-acting work cylinder with a piston having a first working surface effective in a retracting direction and a second working surface effective in an extending direction, wherein the first working surface delimits a first pressure chamber and the second working surface delimits a second pressure chamber, at least two different pressures being applicable to at least one of the first working surface and the second working surface for retracting or extending the piston into and out of the work cylinder, an actuator unit which optionally enables a throttled return flow of a hydraulic medium from the first pressure chamber delimited by the first working surface, and control means for triggering the actuator unit in such a way prior to a sudden acceleration of the piston due to a sudden force release.
    Type: Grant
    Filed: May 31, 2008
    Date of Patent: October 8, 2013
    Assignee: Voith Patent GmbH
    Inventor: Bert Brahmer
  • Patent number: 8413688
    Abstract: A device (100, 200, 200bis, 300, 300bis) for controlling a pilot pressure signal of hydraulic valves (3), for controlling the handling of gravitational loads (M), operating between two pilot lines (108, 109, 208, 209, 308, 309) between the valve (3) and a cylinder (1) adapted to sustain the load (M). The device (100, 200, 200bis, 300, 300bis) is a two-way and two-position valve for the communication between the cylinder stem-side pilot line (5) and the valve-side line (3) and is a valve which can take an open position and a partialized position, or anyway it never takes a closed position. The device (100, 200, 200bis, 300, 300bis) can take a position so that the fluid passage between the pilot lines (108, 109, 208, 209, 308, 309) is never completely closed.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: April 9, 2013
    Assignee: Walvoil S.p.A.
    Inventor: Ivan Bassoli
  • Patent number: 8251189
    Abstract: A railway brake cylinder includes a body (11?); a piston (13?) mobile relative to the body (11?) to act on a brake linkage and delimiting with the body (11?) a pressure chamber (10?) adapted to be supplied by a pneumatic pressure agent source; an auxiliary actuating member (26?) mobile relative to the body (11?) and the piston (13?), mechanically connected to manual operating elements to cause it to occupy either a rest position in which it is away from the piston (13?) or a pushing position in which it is in contact with the piston (13?); two orifices (73?, 51?) in fluid communication with the chamber (10?) and the atmosphere, respectively; and selective connecting elements (28?) between the two orifices (73?, 51?), the elements (28?) being mechanically connected to the auxiliary actuating member.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: August 28, 2012
    Assignee: Faiveley Transport Amiens
    Inventor: Claudino Goncalves
  • Publication number: 20100193311
    Abstract: An apparatus and method for providing enhanced vacuum to a brake booster of a braking system under certain operational conditions. Vacuum is stored in a reservoir and is controllably released to the brake booster to provide a brake booster vacuum level of at least a predetermined vacuum level threshold in order to avoid brake pedal performance issues being perceived by the driver of motor vehicles utilizing engines utilizing a supplemental brake assist system under conditions where the brake booster vacuum level is less than the predetermined vacuum level threshold.
    Type: Application
    Filed: January 30, 2009
    Publication date: August 5, 2010
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Scott Calnek, Terry W. Ostan
  • Patent number: 7748309
    Abstract: An axle locking cylinder structure is capable of enabling an operator of heavy construction equipment to stably carry out an axle locking operation since a sudden variation of the flow rate is prevented in the axle locking cylinder by draining a highly-pressurized flow rate slowly at the release of axle locking and supplying a flow rate quickly at the drive of axle locking. A highly-pressurized hydraulic fluid can be steadily drained from a cylinder chamber since an opening region between a poppet valve and a pilot flow path is enlarged so as to open the pilot flow path connected to the cylinder chamber during a relatively long time. A cylinder rod can be quickly expanded according to the manipulation of an axle locking switch by compensating a flow rate supplied to a cylinder chamber when the cylinder rod is expanded.
    Type: Grant
    Filed: May 25, 2007
    Date of Patent: July 6, 2010
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Jong In Kim
  • Patent number: 7261030
    Abstract: A hydraulic circuit is disclosed that can include a flow control element, a pressure compensator connected via a pair of load sense lines to an inlet line and an outlet line, respectively, of a flow control element to provide a constant pressure drop across the flow control element, and a load sense line control valve installed in a load sense line to provide controllable resistance in a flow passage in opposite flow directions, the resistance in each flow direction being different. The load sense line control valve can include a restrictive orifice followed by a spring-loaded check valve in a first flow direction and at least one other restrictive orifice and a check valve in a second flow direction, the second flow direction opposing the first flow direction.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: August 28, 2007
    Assignee: HydraForce, Inc.
    Inventors: Zilek Liberfarb, Aleksandr Gershik, Michael Cannestra
  • Patent number: 7032499
    Abstract: A hydraulic circuit and method for operating a hydraulic device according to which fluid is passed from a source to the device while some of the fluid is passed to a valve that is adjustable to control the amount of fluid passed to it and therefore the amount of fluid passed to the device.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: April 25, 2006
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Robert E. Domann
  • Patent number: 6952922
    Abstract: A choke valve of the clutch release cylinder wherein the actuating oil is slowly discharged when the clutch pedal is released, and when the clutch pedal is depressed, resistance to the actuating oil is minimized for the actuating oil to be swiftly and smoothly supplied to the clutch release cylinder, thereby improving the responsiveness of the clutch and preventing occurrences of noise and vibration when the clutch is in operation.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: October 11, 2005
    Assignee: Hyundai Motor Company
    Inventor: Jeong-Kyu Lee
  • Patent number: 6619182
    Abstract: A flow control apparatus for a fluid cylinder for a workpiece holder includes a flow restricting member and a flexible sealing member. The flow restricting member defines a first passageway and a sealing surface. The flexible sealing member is positioned around the sealing surface. A second passageway is defined between the sealing member and a sealing surface of the flow restricting member when the sealing member is pushed away from the sealing surface in response to fluid flow in a first direction. When fluid flow is applied in the opposite direction, the sealing member moves to engage the sealing surface to substantially limit or preclude fluid flow between the sealing member and the sealing surface in the second direction. The fluid flow in the second direction is thus restricted to flow through the first passageway, thereby slowing or controlling the flow in the second direction.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: September 16, 2003
    Assignee: Delaware Capital Formation, Inc.
    Inventor: Keith S. Attee
  • Patent number: 6561076
    Abstract: A method of individually adjusting auxiliary hydraulic valves for work vehicles is provided such that they provide different maximum flow rates for opposite flow directions through the valve. The valve is controlled by a flow rate control for setting a maximum flow rate and is also controlled by a proportional control input device having one range of positions for providing a corresponding first range of flow rates in the one direction, a central position for providing substantially no flow, and another range of positions for providing a corresponding second range of flow rates in the other direction.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: May 13, 2003
    Assignee: Case Corporation
    Inventors: Yanming Hou, Curtis A. Halgrimson
  • Patent number: 6546839
    Abstract: The present invention relates to a flow regulation device for mitigating over travel of a piston in a fluid operated tool. The flow regulation device includes a flow channel through which flows an operating fluid to be supplied to operate the piston within the tool and a movable flow restrictor within the flow channel. The flow restrictor has an internal fluid passageway for regulating the flow rate of the operating fluid being supplied to the tool to operate the piston. The flow restrictor also has a frustoconical portion which mates or seats against a portion of the flow channel as fluid is being supplied to operate the piston. A spring is provided to insure that the frustoconical portion seats against the mating portion of the flow channel. When the piston is retracted and operating fluid is being returned to a supply, the force applied by the spring is overcome and the flow restrictor is moved so that the frustoconical portion is unseated from the mating portion.
    Type: Grant
    Filed: August 22, 2000
    Date of Patent: April 15, 2003
    Assignee: TitanTechnologies International, Inc.
    Inventors: James A. Jamra, Peter A. Rosa, Marvin W. Burkhalter, III
  • Patent number: 6536328
    Abstract: A damper valve (70) located between a control valve (18) and a power steering motor (22) in a hydraulic power-assisted steering system (10). The damper valve (70) comprises a housing (72) having axially opposite first and second end portions (76 and 78) and an intermediate portion (80) interposed between the first and second end portions (76 and 78). The first end portion (76) is for fluid communication with the control valve (18) and the second end portion (78) is for fluid communication with the power steering motor (22). A flow restricting element (114) is located within the housing (72) and is movable through portions of the housing (72) including the intermediate portion (80) by fluid flow through the housing (72). The damper valve (70) further includes a biasing element (106) for restraining movement of the flow restricting element (114) toward the first end portion (76) of the housing (72).
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: March 25, 2003
    Assignee: TRW Inc.
    Inventor: Leonard W. Engler
  • Publication number: 20030041727
    Abstract: A balance of force acting on a pool 21 of a control valve 20 is expressed by (P1−P3)·A=F+f When it is assumed that a pressure difference P1−P2 before and after a throttle 42 is &Dgr;P12 to modify the above expression, an expression &Dgr;P12·A+(P2−P3)·A=f+F is obtained. According to the present invention, the force &Dgr;P12·A corresponding to the pressure difference &Dgr;P12 before and after the second throttle 42 of the first term of the left-hand side is applied to the control valve 20 as a force capable of canceling the flow force f at the first term of the right-hand side.
    Type: Application
    Filed: August 30, 2002
    Publication date: March 6, 2003
    Inventors: Kazuhiro Maruta, Nobumi Yoshida
  • Patent number: 6467753
    Abstract: Stopcock actuator casing, comprising a base (1) having an underside and formed with a hole (2), the underside of the base being subdivided into at least three compartments (4,8,10), the first (4) of which surrounds the hole (2) and the second (8) and third (10) of which are each formed with two orifices (12,13,14,15) passing through the base (1).
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: October 22, 2002
    Assignee: KSB S.A.
    Inventors: Jean-Claude Garrigues, Hubert Ferragne
  • Patent number: 6450081
    Abstract: A hydraulic control circuit for controlling the operation of an attachment or tool associated with a particular work machine wherein such circuit includes an actuator for controlling the operation of the attachment or tool, a control valve operable to control fluid flow to the actuator, a fluid path communicating the control valve with the actuator, and a pilot signal control device positioned in communication with both the control valve and a pilot pressure source and having a signal port in communication with the actuator for sensing the pressure associated therewith, the control device being responsive to the pressure associated with the actuator and being operable for sending a control signal to the control valve when a pressure condition in the actuator reaches a predetermined value, the control signal actuating the control valve so as to at least partially close such valve and maintain an operative pressure on the attachment actuator while, at the same time, decreasing the fluid flow through the control
    Type: Grant
    Filed: August 9, 1999
    Date of Patent: September 17, 2002
    Assignee: Caterpillar Inc.
    Inventor: Dennis L. Sorbel
  • Patent number: 6389950
    Abstract: A manually controlled lifting device is provided including a pneumatic lifting drive, a lifting member, a load carrying means, a pressure source, a pressure line, a flow control device, a pneumatic pressure switch and a vent drive. The lifting member is arranged on the pneumatic lifting drive and is a load transmitting component of at least two parts. The load carrying means is attached to the lifting member for carrying a load. The pressure line has a first end and a second end where the first end is in communication with the pressure source and the second end is in communication with the pneumatic lifting drive. The flow control device is in communication with the pressure line and integrated between the two parts of the load transfer component and the pressure source. The flow control device automatically varies a cross section of flow in the pressure line in relation to a load acting on the load carrying means.
    Type: Grant
    Filed: August 16, 2000
    Date of Patent: May 21, 2002
    Assignee: Mannesmann AG
    Inventors: Robert Kühn, Wolfgang Bittenbinder
  • Patent number: 6378412
    Abstract: A lifting cylinder unit (1) has a plunger design, and includes a stationary rod tube (2) having a longitudinal axis (3), two axial end regions, and an outer surface (26). A rod head (4) is arranged in one of the axial end regions of the rod tube (2), the rod head (4) being fixedly connected to the rod tube (2) and including a connecting bore (7). A cylinder tube (14) having two axial end regions and an outer surface (22) is arranged outside the rod tube (2). The cylinder tube (14) is designed and arranged to be movable with respect to the rod tube (2) in the direction of the longitudinal axis (3) of the rod tube (2). A cylinder bottom (15) is arranged in one of the axial end regions of the cylinder tube (14), and is fixedly connected to the cylinder tube (14). A guide bush (18) having an inner surface (23) and including a surface (30) for the application of a force is fixedly connected to the outer surface (26) of the cylinder tube (2).
    Type: Grant
    Filed: October 12, 2000
    Date of Patent: April 30, 2002
    Inventors: Kurt Wittich, Karl Stach
  • Patent number: 6296015
    Abstract: A speed controller has a pilot check valve having a first body which has a first fluid inlet/outlet port defined in an end thereof and a pilot port defined in an opposite end thereof. A flow control valve has a second body integral with the first body. A pipe joint has a third body which has a second fluid inlet/outlet port defined in an end thereof and, the third body being integral with the second body. A flow adjustment screw is disposed in the flow control valve and extends into a fluid passage which interconnects the first fluid inlet/outlet port and the second fluid inlet/outlet port, for adjusting a rate of flow of a fluid under pressure in the fluid passage. A valve body is disposed in the pilot check valve for opening a fluid passage which interconnects the first fluid inlet/outlet port and the second fluid inlet/outlet port in response to a pilot fluid pressure supplied from the pilot port.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: October 2, 2001
    Assignee: SMC Kabushiki Kaisha
    Inventors: Noritaka Morisako, Shizuo Mori
  • Patent number: 6293180
    Abstract: A speed controller has a pilot check valve having a first body which has a first fluid inlet/outlet port defined in an end thereof and a pilot port defined in an opposite end thereof. A flow control valve has a second body integral with the first body. A pipe joint has a third body which has a second fluid inlet/outlet port defined in an end thereof and, the third body being integral with the second body. A flow adjustment screw is disposed in the flow control valve and extends into a fluid passage which interconnects the first fluid inlet/outlet port and the second fluid inlet/outlet port, for adjusting a rate of flow of a fluid under pressure in the fluid passage. A valve body is disposed in the pilot check valve for opening a fluid passage which interconnects the first fluid inlet/outlet port and the second fluid inlet/outlet port in response to a pilot fluid pressure supplied from the pilot port.
    Type: Grant
    Filed: July 21, 2000
    Date of Patent: September 25, 2001
    Assignee: SMC Kabushiki Kaisha
    Inventors: Noritaka Morisako, Shizuo Mori
  • Patent number: 6279451
    Abstract: A small-sized and inexpensive air cylinder with a cushion mechanism having a simple structure is provided. Therefore, discharge outlets for discharging cushioning air are disposed in positions closer to ends of the stroke than the openings of the ports in the cylinder tube, respectively, and check valves and throttling mechanisms are arranged in parallel between discharge outlets and ports, respectively. On the outer peripheral surface of the piston, one of the piston packing rings is disposed in one position which does not pass through the opening of the port while another of the piston packing rings is disposed in another position which passes through the opening but does not pass through discharge outlet, when the piston reaches the terminal ends of the stroke.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: August 28, 2001
    Assignee: SMC Corporation
    Inventors: Akihiro Hirano, Kenichi Nishimata
  • Patent number: 6260467
    Abstract: A construction machine, e.g., a backhoe, has a chassis and a digging tool mounted for movement, e.g., swinging movement, with respect to such chassis. A machine hydraulic circuit includes a pump, a hydraulic actuator coupled to the tool for tool movement, and a directional valve between the pump and the actuator. In several specific embodiments, the circuit includes first and second flow restrictors coupled between the pump and the actuator. There is also a valve device for selectively disabling the second flow restrictor, thereby configuring the circuit to provide either of two maximum rates of tool movement. In other embodiments, the circuit uses a variable delivery, fluid-pumping power source and a load-sensing line coupled between the pump and the actuator. The valve device is in series with the load-sensing line and includes a restriction-free path and a flow-restricted path therethrough, thereby configuring the circuit to provide either of two maximum rates of tool movement.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: July 17, 2001
    Assignee: Case Corporation
    Inventors: Roger Mickelson, Richard J. Lech
  • Patent number: 6250201
    Abstract: A throttle device for use with a hydraulic adjustment devices that have an input cylinder and an output cylinder and a hydraulic line filled with fluid connecting the output cylinder and the input cylinder, is arranged in the hydraulic line for establishing various throttle resistances to the flow of the fluid in both flow directions through the hydraulic line. The throttle device includes a disk with at least one boring and/or at least one passage channel. The disk moves back and forth, as the fluid flows, in both flow directions, and thereby strikes against a first stop in one direction and against a second stop in the other direction. The throttle device in the form of a disk in the movement space which is a transition from the hydraulic line to the supply line of the cylinder in its diameter, with a stop disk secured in the hydraulic line forming the second stop is economically advantageous. The disk that acts as the valve is distinguished by its low cost.
    Type: Grant
    Filed: February 23, 1999
    Date of Patent: June 26, 2001
    Assignee: Mannesmann Sachs AG
    Inventors: Olaf Pagels, Angelika Ebert, Boleslaw Tulaczko, Thomas Riess, Wolfgang Grosspietsch, Klaus Krappmann
  • Patent number: 6164385
    Abstract: An automatic depth control system is disclosed. The system includes a Console and remote Controller mounted in the tractor cab, power beyond Valving, and Depth Sensors, either ground contact or non-ground contact, mounted on the frame of the implement. The depth sensing system is provided to sense the actual penetration of an implement tool by determining the height of the implement frame above the ground. A circuit system is provided to receive the depth signal and to signal power beyond valving that will effect hydraulic corrections in order to maintain the select depth penetration. The Console includes an instrument panel having a toggle switch with AUTO, LOCK and MANUAL positions, an LED showing depth of tool penetration and a bargraph depicting variations from a desired depth and flashing lights on the bargraph to show depth corrections in process. The Console also includes a depth window in which no hydraulic correction would be made, a sensitivity switch, depth sensor switches and an UP/REPHASE switch.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: December 26, 2000
    Inventor: Andrew F. Buchl
  • Patent number: 6131610
    Abstract: A speed controller has a pilot check valve having a first body which has a first fluid inlet/outlet port defined in an end thereof and a pilot port defined in an opposite end thereof. A flow control valve has a second body integral with the first body. A pipe joint has a third body which has a second fluid inlet/outlet port defined in an end thereof and, the third body being integral with the second body. A flow adjustment screw is disposed in the flow control valve and extends into a fluid passage which interconnects the first fluid inlet/outlet port and the second fluid inlet/outlet port, for adjusting a rate of flow of a fluid under pressure in the fluid passage. A valve body is disposed in the pilot check valve for opening a fluid passage which interconnects the first fluid inlet/outlet port and the second fluid inlet/outlet port in response to a pilot fluid pressure supplied from the pilot port.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: October 17, 2000
    Assignee: SMC Kabushiki Kaisha
    Inventors: Noritaka Morisako, Shizuo Mori
  • Patent number: 6071096
    Abstract: A pneumatic cylinder for actuating fume extraction valves in fume and heat extraction plants has a piston (2) that may be actuated from both sides with at least one working surface and that can be made to slide by pressurised air in a cylinder (1) with at least one working chamber (4), as well as an energy accumulator with regulating means. The regulating means can be controlled by control means to open or keep open the fume extraction valves. In order to obtain a compact pneumatic cylinder for a fume and heat extraction plant which is easy to install, a storage chamber in which air or pressurised air is stored as compressible pressure medium is provided as energy accumulator. The storage chamber is in communication with a compression surface (7) of the piston (2), at its side opposite to the working surface (7), so that pressure medium may flow between the storage chamber and the compression surface (7).
    Type: Grant
    Filed: October 27, 1998
    Date of Patent: June 6, 2000
    Inventor: Andreas Grasl
  • Patent number: 5918528
    Abstract: A fluid flow control for controlling the speed of a piston in a fluid power cylinder is disclosed in which the flow control is located within the confines of the cylinder and includes a rotatable disk having tearshaped slots for communication of the exhaust fluid through the disk and out of the cylinder through discharge ports. Rotation of the disk to selectively position greater or lesser width portions of the tearshaped slot relative to an exhaust discharge opening in the cylinder permits selective, variable adjustment and throttling of the exhaust fluid to control the speed of movement of the piston in the cylinder.
    Type: Grant
    Filed: July 22, 1997
    Date of Patent: July 6, 1999
    Assignee: Bimba Manufacturing Company
    Inventor: E. Wayne Hays
  • Patent number: 5915679
    Abstract: A support element for supporting or holding a work piece on a mounting surface, for example in a machine tool, has a support or pin movably mounted in a housing. The pin is moved into contact with a work piece by an airstream, held in work piece contact by a hydraulic piston, and reset into a starting position by at least one spring, whereby the work piece is contacted gently under a manual throttle control of the airstream, but firmly held in place by hydraulic pressure.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: June 29, 1999
    Inventor: Rudolf Kohlert
  • Patent number: 5868161
    Abstract: In a damper valve for use in a steering damper arrangement of a motor vehicle having a hydrostatic displacement motor for operating the vehicle steering mechanism wherein hydraulic fluid lines extending between the hydraulic motor and a servo-valve include the damper valve, the damper valve has a throttling arrangement which permits fluid flow in one direction and limits fluid flow in the opposite direction but permits essentially unlimited fluid flow in both directions as long as the pressure difference across the damper valve is below a predetermined threshold value so as to permit unrestricted normal steering movements of the vehicle steering system, but dampen shock movements thereof.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: February 9, 1999
    Assignee: Daimler-Benz AG
    Inventors: Ulrich Asbrand, Aydogan Cakmaz, Juergen Class
  • Patent number: 5819783
    Abstract: An apparatus selectively supplies a source of pressurized fluid to a load device and selectively exhausts pressurized fluid from the load device. The apparatus includes a first housing for defining a longitudinally extending aperture communicating through first, second, and third passages with spaced first, second and third external surface portions of the first housing. A valve spool is engageable within the first aperture for longitudinal movement between a first position communicating the second passage with the third passage and a second position communicating the first passage with the second passage. The valve spool is normally biased toward the first position. Modular port members are connectable to the first, second and third spaced external surface portions for connecting the first passage to a source of pressurized fluid, the second passage to the load device, and the third passage to an exhaust port.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: October 13, 1998
    Assignee: ISI Norgren Inc.
    Inventors: John A. Blatt, Wayne D. Morroney, James J. Acierno
  • Patent number: 5690143
    Abstract: A valve for a motor vehicle power steering gear including a tubular valve body having a plurality of internal lands, a valve spool rotatable inside of the valve body having a plurality of external lands, and a plurality of metering flats on the external lands which cooperate with linear edges of the internal lands in defining a pair of series connected metering orifices in a fluid flow path through the rotary valve from a pump to a reservoir. When the series connected metering orifices are fully closed, the effective circumferential overlap between the internal and external lands which prevents leakage from the pump to the reservoir is the sum of the circumferential overlaps at the individual metering orifices.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: November 25, 1997
    Assignee: General Motors Corporation
    Inventor: Joel Edward Birsching
  • Patent number: 5623861
    Abstract: A pneumatic cylinder, especially for a spot-welding machine, has a sleeve valve mounted on the piston rod. The sleeve valve provides a venting valve for dumping pressure from a return chamber at the end of the forward stroke, and a progressive restrictor to close off a forward chamber and provide cushioning at the end of the return stroke.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 29, 1997
    Assignee: Savair, Inc.
    Inventors: Allan Ward, David J. Trimmer
  • Patent number: 5465746
    Abstract: A pneumatic circuit prolongs a pneumatic valve opening time using an accumulator with two quick exhaust type valves in series while providing a rapid valve closing time. This structure and method is self-contained and amenable to retrofit in existing installations without any external connections. Slow opening is achieved by routing inlet gas pressure simultaneously to an accumulator and the operating cylinder of the valve to be opened. A tortuous piping path and increased volume to be pressurized due to the addition of the accumulator substantially reduces the isolation valve opening time, thereby eliminating problems associated with quick opening of a pneumatic valve. When the pneumatic valve needs to be closed quickly, slight venting toward the inlet valve immediately causes the quick exhaust valves to vent their downstream pressure. The accumulator then vents through its quick exhaust valve while separately the main quick exhaust valve quickly vents the air cylinder of the pneumatic valve.
    Type: Grant
    Filed: January 13, 1994
    Date of Patent: November 14, 1995
    Assignee: Applied Materials, Inc.
    Inventor: Peter F. Ebbing
  • Patent number: 5381828
    Abstract: A valve for slowly starting an actuator includes a block having an inlet port, an outlet port, and a passage providing communication between the inlet and outlet ports. A first valve body is disposed in the passage for selectively opening and closing the passage, and a second valve body is disposed downstream of the first valve body with respect to the passage for selectively opening and closing the passage. A needle valve is disposed in the block parallel to the second valve body between the passage and the outlet port for restricting the fluid under pressure discharged from the outlet port. The second valve body has a passage defined therein and communicating from one end to the other end thereof, and first and second pressure-bearing surfaces on the one and other ends, respectively, the first pressure-bearing surface is wider than the second pressure-bearing surface.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: January 17, 1995
    Assignee: SMC Kabushiki Kaisha
    Inventors: Yasuhisa Kimura, Takehiko Miyaguchi
  • Patent number: 5320135
    Abstract: A flow compensator valve for use in a hydraulic system which includes a cylindrical body having inlet and outlet ports, and a slidable, spring-biased hollow piston insert disposed within a center bore of the body, which insert has a plurality of ports for flow control depending on the position of the insert as it reciprocates axially within the center bore of the valve body. In a preferred embodiment, the valve is used in connection with a hydraulically actuated lift which is particularly useful for assistance of handicap persons for vans and mass transit vehicles. The axially-reciprocable, spring-biased flow rate controlling insert has a small central axial bore for slow lift movement in the loaded condition and at least one larger transverse bore, which when exposed, permits flow therethrough for faster movement of the lift in the unloaded condition.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: June 14, 1994
    Assignee: The Braun Corporation
    Inventor: James R. Pierrou
  • Patent number: 5287885
    Abstract: A motion control system for hydraulically operated lifting devices. The system provides for the dynamic weighing of a loaded container by controllably directing hydraulic flow through a bypass chamber of a two-way valve. An analog output signal is generated by a hydraulic pressure transducer fluidly communicating with the two-way valve or by a tensiometer mounted on the arms of the lifting device. The two-way valve further provides a second bypass chamber which receives fluid under gravity from the lift circuit line of the hydraulic cylinder for controllably lowering the lifting device. The pressure transducer or tensiometer generate an analog signal proportionate to the weight being lowered and whereby the hydraulic fluid is returned to the reservoir of the hydraulic system independently and downstream of the main operating valve.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: February 22, 1994
    Assignee: Wray-Tech Instruments, Inc.
    Inventor: Ronald Smith
  • Patent number: 5207059
    Abstract: Hydraulic control systems are useful for controlling actuation of hydraulic motors. Some such systems use spool type valves while other systems use poppet type valves, both of which have their advantages and disadvantages. The present hydraulic control system is a hybrid system utilizing a combination of both a spool type control valve and poppet type control valves in a single work circuit. Specifically, a spool type control valve has an inlet port connected to a variable displacement pump and a pair of flow amplifying poppet type valves are serially disposed between a pair of motor ports of the spool type valve and a pair of actuating chambers of a double acting hydraulic motor. The spool type control valve is operative to control pump-to-motor flow while one of the poppet type valves is operative to control motor-to-tank flow.
    Type: Grant
    Filed: January 15, 1992
    Date of Patent: May 4, 1993
    Assignee: Caterpillar Inc.
    Inventor: Lawrence F. Schexnayder
  • Patent number: 5195418
    Abstract: A motion control system for hydraulically operated lifting devices. The system provides for the dynamic weighing of a loaded container by controllably directing hydraulic flow through a bypass chamber of a two-way valve. An analog output signal is generated by a hydraulic pressure transducer fluidly communicating with the two-way valve or by a tensiometer mounted on the arms of the lifting device. The two-way valve further provides a second bypass chamber which receives fluid under gravity from the lift circuit line of the hydraulic cylinder for controllably lowering the lifting device. The pressure transducer or tensiometer generates an analog signal proportionate to the weight being lowered and whereby the hydraulic fluid is returned to the reservoir of the hydraulic system independently and downstream of the main operating valve.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: March 23, 1993
    Assignee: Wray-Tech Instruments, Inc.
    Inventor: Ronald Smith
  • Patent number: 5187933
    Abstract: The invention relates to a variable displacement pump supplying fluid to a number of consumers. The pump control for adjusting the delivery rate is actuated by a signal which is produced by the respective highest loaded consumer. The signal is provided by a valve, in particular a pressure compensating valve which is associated with the consumer, and which valve opens a spool land when the valve becomes positioned at its control end range. A pressure signal from any pressure fluid source is delivered through the land to the pump controller. The control, according to the invention, offers a broad variety of possibilities for arranging the pressure compensation valve at various locations, engaging the valve by a variety of pressure differences, and using a number of pressure fluid sources of provide for the signal pressure to actuate the pump controller.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: February 23, 1993
    Assignee: Mannesmann Rexroth GmbH
    Inventor: Heinrich Nikolaus
  • Patent number: 5184535
    Abstract: A speed control device for a pneumatic cylinder of the invention is characterized in that a speed control of the pneumatic cylinder can be changed from air pressure to air mass flow by a two-way valve and an airflow control valve. Therefore, an ordinary and low moving speed of a load is maintained even if the load changes its speed or stops moving, and thus any accidents caused by a change of the moving speed of the load are prevented beforehand. Additionally, since in this invention only a two-way valve and an airflow control valve are added to a conventional pneumatic cylinder and high relief type pressure reducing valve, the device of the invention is simply constructed and has a wide variety of usage. Furthermore, since the device of the invention is provided with a pressure accumulator and a checking valve, the pneumatic cylinder can be stably controlled even when the load moves at a high speed.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: February 9, 1993
    Inventor: Takashi Kimura
  • Patent number: 5111735
    Abstract: An air spring apparatus has quick pressure release, and rapid air exhaust, capability by means of a relatively large diameter exhaust port in a larger, primary air spring which is controlled by the action of a smaller, secondary air spring. The secondary air spring is equipped with a check valve which controls the flow of air into the primary air spring. The rapid exhaust of the primary air spring is effected by triggering the removal of air pressure from the secondary air spring through a plurality of orifices in a centrally disposed guide tube which permits the collapse of the smaller air spring and the accompanying removal of a valve plate from a relatively large diameter exhaust port of the primary air spring.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: May 12, 1992
    Assignee: Beloit Corporation
    Inventor: Noel R. Johnson
  • Patent number: 5105721
    Abstract: A brake booster includes a housing in which a constant-pressure chamber and a variable-pressure chamber are defined by a power piston. An input rod is operatively connected to one end of the power piston and receives an input force. A valve is provided in the power piston and operatively connected to the input piston so as to open upon receipt of the input force in such a manner that the differential pressure between the chambers moves the power piston. An output rod is operatively connected to the other end of the power piston. A wall member is provided across which a first auxiliary chamber at a side of the variable-pressure chamber and a second auxiliary chamber formed at a slide of the constant pressure are formed. An orifice passage connects the variable pressure chamber and the first auxiliary chamber.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: April 21, 1992
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Yoichi Furuta, Akira Shirai, Satoshi Kawasumi
  • Patent number: 5097747
    Abstract: The invention discloses a controlled connector-adjuster permitting two different speeds in the same stroke of a double-acting pneumatic pressure cylinder.In the absence of a control signal at the orifice (13) of the apparatus, the escape pressure from the cylinder (30) effecting its rod extension stroke, finds the return valve (14) closed and holds the piston (2) against the stop (9) whose adjustment defines a first flowrate between the needle valve (15) at the end of the piston and its seat (16), which flowrate corresponds to the high speed. The arrival of a pressure signal into the chamber (6) causes piston (2) to move until it abuts on a second screw (7) whose adjustment permits a second smaller flowrate than the first one and which thus determines the second speed.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: March 24, 1992
    Assignee: Legris S.A.
    Inventor: Yves Levenez
  • Patent number: 5088283
    Abstract: A proportional directional control valve in combination with a pressure compensator flow rate control valve opening towards a reservoir and a pressure unloading valve in the load- pressure- carrying control line for the compensator valve are provided to actuate the telescopic cylinder of a tipper truck. The valve device is connected to a pump of constant displacement. The operating speed of the telescopic cylinder is independent from the load to be lifted and the driving speed of the pump. Upon reaching a predetermined load pressure the pressure unloading valve is activated and the load pressure engaging the compensator valve towards closing direction is reduced via the reservoir such that the compensator valve opens and the pump displacement volume returns to the reservoir.
    Type: Grant
    Filed: January 10, 1990
    Date of Patent: February 18, 1992
    Assignee: Mannesmann Rexroth GmbH
    Inventor: Deian Bosniac
  • Patent number: 5086688
    Abstract: The hydraulic booster device for a brake circuit, comprises a body (30) pierced with a bore (32), in which slide coaxially a pusher (25) controlled by a brake pedal and a piston means (34) located between first (5) and second (33) chambers containing a brake fluid, the first chamber (5) receiving at least one spring (51, 52) which loads the pusher (25) and the piston means (34) away from one another, the first (5) and second (33) chambers being connected respectively to sources of fluid under low pressure (11) and under high pressure (13) by valve mechanism (15). An auxiliary chamber (4) of a volume variable as a function of the position of the pusher (25m), made in the bore (32), communicates with the first chamber (5), on the one hand permanently by way of a restriction (6) and on the other hand by an auxiliary valve mechanism (3) allowing communication during an increased in the volume of the auxiliary chamber (4) and preventing it during a reduction of the latter.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: February 11, 1992
    Assignee: Bendix Europe Services Techniques
    Inventor: Gilbert Kervagoret