Power Fluid Also Fed Into A Separate Expansible Chamber Directly Driving Output Means Patents (Class 60/560)
  • Patent number: 10895270
    Abstract: A hydraulic actuator (1) is disclosed comprising a cylinder housing (2), a piston (5) with a piston rod (6) being displaceably arranged inside the cylinder housing (2) and a pressure amplifier (10) comprising an inlet section (18) with a pressure inlet port (20), an active section (19) with a high pressure outlet port (22), a low pressure chamber (32) and a high pressure chamber (38a). It is an objective of the invention to provide a hydraulic actuator (1) with a modular pressure amplifier (10). To this end, the inlet section (18) is arranged inside the piston rod (6), and wherein the low pressure chamber (32) is stationarily arranged relative to the inlet section (18).
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: January 19, 2021
    Assignee: PISTONPOWER APS
    Inventors: Jørgen P. Todsen, Tom Tychsen, Peter Zavadinka, Lubos Vokel, Juraj Hanusovsky, Jørgen Mads Clausen
  • Patent number: 10816016
    Abstract: A through-hole of a hydraulic chamber is provided on an input side of a thrust expansion device in accordance with rod diameters of various actuators on the input side, and an input rod of an air cylinder or the like is inserted therein. Thus, a thrust expansion mechanism operates. An input-side actuator attaching portion of the thrust expansion device is configured such that parts can be changed according to a fixing method of various actuators and a rod shape. It is possible to freely change a thrust expansion ratio by changing a cross sectional area of the input rod. A stroke of an output-side rod can be changed by changing an input stroke of the input-side actuator. According to the thrust expansion device, various inexpensive commercially available actuators can be easily attached and replaced by being separated and independent from the input-side actuator.
    Type: Grant
    Filed: October 17, 2019
    Date of Patent: October 27, 2020
    Assignee: SEIKO INSTRUMENTS INC.
    Inventor: Shigehiro Arai
  • Patent number: 10408318
    Abstract: A variable displacement linkage mechanism includes a slider mechanism, a cam, a connecting link, a rocker link, and a cam follower. The connecting link is coupled to the slider through a first revolute joint. The rocker link includes a rocker end and a ground end. The rocker end is coupled to the connection link through a second revolute joint, and the ground end is coupled to ground through a third revolute joint. The cam follower is coupled to the connecting link and engages the cam. A location of the third revolute joint is adjustable relative to the first revolute joint.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: September 10, 2019
    Assignee: Regents of the University of Minnesota
    Inventors: James Donald Van de Ven, Shawn Richard Wilhelm
  • Patent number: 10118456
    Abstract: A suspension system is disclosed utilizing oil addition and subtraction to actuate an accumulator to control position and stiffness in an Emulsion Shock/Oleo Pneumatic strut/Air spring strut. The strut maintains ride height for a wide variation in sprung mass and adjusts for the expansion/compression of the gas due to variations in temperature. The strut provides spring and damping characteristics.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: November 6, 2018
    Inventors: David Perrault, Ivan Davis
  • Patent number: 10024340
    Abstract: A first piston (4) which is coupled to an output rod (2) and which is inserted in a housing (3) is driven upward by a pressurized fluid. A second piston (6) which is arranged above the first piston (4) is driven downward. This causes a wedge-type force multiplier (M), arranged above the first piston (4), to carry out force multiplication driving with respect to the output rod (2).
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: July 17, 2018
    Assignee: KOSMEK LTD.
    Inventors: Hideaki Yokota, Keitaro Yonezawa
  • Patent number: 9945392
    Abstract: A hydropneumatic device having pressure a working part with a working piston guided in the working part and an intensifier part with an intensifier piston guided in the intensifier part. A connecting section for a hydraulic connection of the working part and of the intensifier part provides a connecting line for passage of hydraulic fluid between the working part and the intensifier part. The connecting section includes an adapter component which can be mounted on the working part and the intensifier part, and in the interior of which the connecting line is formed. In the mounted state of the adapter component, an opening, which is provided at the side on the working part, of a hydraulic chamber of the working part is connected, via the connecting line, to an opening, which is provided at the side on the intensifier part, of a hydraulic chamber of the intensifier part.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: April 17, 2018
    Assignee: Tox Pressotechnik GmbH & Co. KG
    Inventors: Eberhard Dietzel, Eugen Rapp
  • Patent number: 9816535
    Abstract: A device for riveting and a hydropneumatic device for pressure transmission, including a working piston and a transmitter piston in the form of a double-acting cylinder for transmitting pressure to the working piston, wherein a working stroke of the working piston in a working direction includes a first stroke and a subsequent second stroke, wherein the first stroke is controlled by means of pneumatic pressure acting on the working piston and the second stroke is controlled by means of pneumatic pressure acting on the transmitter piston, and wherein hydraulic fluid is displaced by the transmitter piston and the displaced hydraulic fluid effects the second stroke of the working piston. Regulation means having an actuating device are provided for regulating the pneumatic pressure on both sides of the double-acting cylinder of the transmitter piston such that the second stroke of the working piston is predefined by way of the regulation.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: November 14, 2017
    Assignee: Tox Pressotechnik GmbH & Co. KG
    Inventor: Manfred Gresser
  • Patent number: 9689407
    Abstract: A hydraulic drive including a first differential cylinder that includes a first and a second pressure chamber and a first piston that separates the first from the second pressure chamber and having two pumps delivering in opposite direction. The hydraulic drive further includes a second differential cylinder that includes a first and a second pressure chamber and a second piston that separates the first pressure chamber from the second pressure chamber, and a directional control valve that has a first and a second switching position. The pumps in the first switching position are respectively hydraulically connected via pressure chambers of the first differential cylinder that are different from each other and whereby the pumps in the second switching position are respectively connected via pressure chambers of the second differential cylinder that are different from each other.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: June 27, 2017
    Assignee: Voith Patent GmbH
    Inventor: Magnus Junginger
  • Patent number: 9505054
    Abstract: In an injection apparatus, a first cylinder and second cylinder for driving an injection cylinder connected to an injection plunger are connected in parallel with each other with respect to the injection cylinder. A piston of the first cylinder and a piston of the second cylinder are synchronously driven by driving means. A directional control valve and first flow rate adjustment circuit are provided between one end of the injection cylinder and one end of the first cylinder. Moreover, second flow rate adjustment circuit is provided between the other end of the injection cylinder and the other ends of the first and second cylinders.
    Type: Grant
    Filed: May 30, 2013
    Date of Patent: November 29, 2016
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Kazuyuki Yamaguchi, Kazuki Funahashi
  • Patent number: 9151690
    Abstract: This disclosure relates generally to systems and methods for testing hoses, and also to a configuration for an intensifier for increasing the pressure and temperature of oil within the hoses to be tested.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: October 6, 2015
    Assignee: GATES CORPORATION
    Inventor: Colin Donald Cook
  • Publication number: 20150075157
    Abstract: A device for riveting and a hydropneumatic device for pressure transmission, including a working piston and a transmitter piston in the form of a double-acting cylinder for transmitting pressure to the working piston, wherein a working stroke of the working piston in a working direction includes a first stroke and a subsequent second stroke, wherein the first stroke is controlled by means of pneumatic pressure acting on the working piston and the second stroke is controlled by means of pneumatic pressure acting on the transmitter piston, and wherein hydraulic fluid is displaced by the transmitter piston and the displaced hydraulic fluid effects the second stroke of the working piston. Regulation means having an actuating device are provided for regulating the pneumatic pressure on both sides of the double-acting cylinder of the transmitter piston such that the second stroke of the working piston is predefined by way of the regulation.
    Type: Application
    Filed: October 10, 2014
    Publication date: March 19, 2015
    Inventor: Manfred GRESSER
  • Patent number: 8256227
    Abstract: An engine comprises a combustion chamber, an expansion cylinder with a piston adapted for reciprocating motion in the expansion cylinder via combustion products combusted in the combustion chamber, and a transmission associated with the expansion cylinder. The transmission has a guide frame with a first drive wheel rotatably mounted at one end of the guide frame and a second drive wheel rotatably mounted at an opposite longitudinal end of the guide frame. Each of the drive wheels is driven by an inextensible continuous loop. The guide frame has a crank head adapted to reciprocatingly translate along the guide frame. The crank head has a drive connection pivotally connecting the crank head to the loop. The crank head is operatively connected to the piston such that reciprocating motion of the piston results in corresponding reciprocating motion of the crank head, movement of the loop, and corresponding rotation of the drive wheels.
    Type: Grant
    Filed: August 26, 2008
    Date of Patent: September 4, 2012
    Inventor: John Arthur Devine
  • Publication number: 20120204553
    Abstract: A method for transforming pressures of a system operating with pressure medium to optimize the travel speeds and/or forces of tasks utilizing pressure, area and flow ratios, employing valve structures, in which method, transforming with pressure transformers the pressure of the actuators differ from system pressure. A device implementing the method includes valve structures and pressure transformers. In the method, pressure transformers are switched when going above or below a set limit value controlling valves of actuators which requires the transformation of travel speed or force. In the device, pressure transformers are arranged to be switched when going above or below a set limit value controlling the valves for the actuator which requires higher travel speed or force.
    Type: Application
    Filed: October 20, 2010
    Publication date: August 16, 2012
    Inventor: Mikko Junttila
  • Patent number: 7686596
    Abstract: A hydraulic pressure amplifier with a housing which has an end face at a low pressure side and an end face at a high pressure side and a circumferential wall between the two end faces, wherein an outlet valve is arranged adjacent the end face on the high pressure side, and an outlet duct for the hydraulic liquid which is under high pressure. In a pressure amplifier of the above-described type, the outlet duct opens into the circumferential wall or extends through a connection plug which is screwed into the end face on the high pressure side and closes off an assembly duct which receives the outlet valve.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: March 30, 2010
    Assignee: miniBOOSTER HYDRAULICS A/S
    Inventors: Peter J. M. Clausen, Leif Hansen, Thyge Bollmann, Christen Espersen
  • Publication number: 20090320464
    Abstract: A hydraulic brake system includes a piston that separates a first pressure chamber from a second pressure chamber of a cylinder bore. A valve within a piston bore is movable between three positions. In the first position, the first and second pressure chambers are in fluid communication with a low-pressure fluid supply; in the second position, the second pressure chamber is isolated from the first pressure chamber and the low-pressure fluid supply; in the third position, a high-pressure fluid supply is in fluid communication with the second pressure chamber, allowing high-pressure fluid to flow into the second pressure chamber. High pressure in the second pressure chamber moves the boost piston, applying boosted braking pressure to a vehicle brake. Pressure in the second chamber against a surface of the valve biases the valve toward the first position.
    Type: Application
    Filed: June 26, 2008
    Publication date: December 31, 2009
    Applicants: U.S. Environmental Protection Agency
    Inventors: Charles L. Gray, JR., Mark Stuhldreher
  • Publication number: 20090044962
    Abstract: An intensifier is operable to supply force and includes a housing defining a cavity. A ram is slidably positioned within the cavity and partially extends from the housing. The ram is moveable between retracted and extended positions along a longitudinal axis. First and second links are rotatably coupled to one another about an axis of rotation and are selectively moveable between retracted positions where the axis of rotation is not axially aligned with the ram and partially extended positions where the axis of rotation is axially aligned with the ram. The intensifier includes a plurality of power pistons axially aligned with each other and the ram. The power pistons are selectively operable to provide an output force to the ram when the first and second links are in the partially extended positions.
    Type: Application
    Filed: August 15, 2007
    Publication date: February 19, 2009
    Inventors: Edwin G. Sawdon, Steven J. Sprotberry, Brian D. Petit
  • Patent number: 7373777
    Abstract: A die drive unit has a cylinder mechanism which hydraulically drives a piston member and an additional drive mechanism which drives the piston member by means of a drive source other than a hydraulic one. A first oil chamber is formed on one side of the piston member. A second oil chamber and a third oil chamber are formed on the other side of the piston member. The first oil chamber and the second oil chamber are connected to each other by an oil passage. The piston pressure receiving area of the first oil chamber is equal to the sum of those of the second and third oil chambers.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: May 20, 2008
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Jun Koike, Takaki Miyauchi, Haruhiko Kikuchi
  • Patent number: 7240490
    Abstract: A tool arrangement includes a tool unit 2, e.g. a cutting apparatus 2?, a spreader 2?, a squeezing device or the like, and a drive 3, a control and/or switching clement, as well as a first operating-medium circuit 4, in which tool arrangement a second operating-medium circuit 5 is provided, which is actively connected to the first operating-medium circuit 7 by a pressurized-media converter 6.
    Type: Grant
    Filed: July 15, 2004
    Date of Patent: July 10, 2007
    Assignee: Lukas Hydraulik GmbH
    Inventors: Klaus Baumüller, Otto Zeitler, Christoff Lasaroff, Dietmar Lindner
  • Patent number: 7231766
    Abstract: The present invention includes a piston valve for charging and discharging a first fluid chamber. The piston valve includes a piston shaft and a ring comprising a seal element. The piston shaft has a first end and a second end with the first end including a counter bore having at least one vent. The ring is disposed within a cylinder and the seal element is disposed intermediate the piston shaft and the ring. The piston valve may be used for intensification purposes such as in a high pressure high temperature hydraulic cartridge.
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: June 19, 2007
    Inventors: David R. Hall, Timothy C. Duke, Ronald Crockett, Jeff Jepson
  • Patent number: 7204087
    Abstract: A hydraulic tool has a motor, a valve, a hydraulic intensifier, and a supply connector. The hydraulic intensifier is arranged between the valve and the motor. The valve and the motor are arranged behind one another in a longitudinal direction of the tool. The hydraulic intensifier has at least one intensifier piston having a movement direction that is positioned at a first angle greater than 0° relative to the longitudinal direction of the tool.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: April 17, 2007
    Assignee: miniBooster Hydraulics A/S
    Inventors: Leif Hansen, Christen Espersen, Thyge Bollmann, Peter J. M. Clausen
  • Patent number: 7124581
    Abstract: A drive mechanism for an injection molding machine has an output element that is moveable in a straight line and an electric motor drive unit having an electric motor and a piston-cylinder unit which has a first piston-cylinder unit in the force chain between the output element of the electric-motor drive unit and the movable component. A rapid actuating movement is possible and, the action of a high force is also achievable wherein a second piston-cylinder unit and a third piston-cylinder unit. A fluidic connection between the first cylinder chamber and the second cylinder chamber is controllable via a valve. When the valve is open, the second hydraulic piston displaces pressurized liquid from the second cylinder chamber into the first cylinder chamber, to actuate the movable component and, when the valve is closed, the third hydraulic piston displaces pressurized liquid from the third cylinder chamber into the first cylinder chamber to exert a high force on the movable component.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: October 24, 2006
    Assignee: Bosch Rexroth AG
    Inventor: Jörg Dantlgraber
  • Patent number: 7010912
    Abstract: A drive device has a drive element movable axially by means of an electric motor and a hydraulic unit. In the drive device it is important to execute a rapid adjusting movement and then to exert high forces. This causes high reaction forces on the lifting spindle. High reaction forces are avoided if a force intensifier with two pistons movable in relation to one another and differing from one another in the size of their active surfaces along with an intermediate part which, together with the pistons, encloses a pressure space filled with a pressure fluid is used, if the smaller active surface is connected mechanically to the drive element, for the adjusting movement, the hydraulic unit can be moved as a whole, and if, for exerting a high force by means of the larger active surface, the intermediate part can be blocked against displacement in relation to a fixed stand.
    Type: Grant
    Filed: May 7, 2002
    Date of Patent: March 14, 2006
    Assignee: Bosch Rexroth AG
    Inventor: Jörg Dantlgraber
  • Patent number: 6779343
    Abstract: A pressure intensifier for generating a relatively large output force includes a piston driven in an advancing direction and a retracting direction. In one embodiment, two pistons are also driven to eliminate the need for a high pressure source. Another embodiment includes a biased piston for urging a ram in the advancing direction. A module for converting a single piston intensifier to a dual piston intensifier is also discussed.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: August 24, 2004
    Assignee: BTM Corporation
    Inventor: Edwin G. Sawdon
  • Patent number: 6735944
    Abstract: A pressure intensifier for generating relatively large output force includes a piston driven in an advancing and a retracting direction. The piston provides a relatively large cross-sectional area for a pressurized fluid to act during the retracting stroke. As such, relatively large, heavy, tools may be returned to an elevated position without the use of external force-producing devices.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: May 18, 2004
    Assignee: BTM Corporation
    Inventor: Edwin G. Sawdon
  • Patent number: 6705082
    Abstract: Disclosed is a hydraulic pressure booster cylinder. In a low pressure stroke, in a state wherein a slide piston is positioned close to a third piston, as compressed air is supplied into a second pneumatic chamber, a second piston is moved toward a bore, and thereby the third piston and the slide piston are integrally moved to allow a piston rod to extend out of a cylinder case. In a high pressure stroke, when movement of the second piston is blocked by a load, the slide piston is moved toward a check valve and pushes the check valve in one direction, compressed air flows into a first pneumatic chamber and air existing in the second pneumatic chamber is discharged to the outside, and, by movement of a first piston, a trunk piston portion is moved toward the third piston through the bore while maintaining airtightness.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: March 16, 2004
    Inventor: Jae Seak Ju
  • Publication number: 20040028543
    Abstract: The invention relates to a hydroelectric pressure intensifier in which the plunger piston (8) and/or the driving spindle (9) of said plunger piston and/or the piston rod (3) of the working piston (2) are driven by electrical means, especially electromotors such as linear motors (11).
    Type: Application
    Filed: March 31, 2003
    Publication date: February 12, 2004
    Inventor: Eugen Rapp
  • Publication number: 20030172652
    Abstract: An offer of a double-acting pressure intensifying cylinder and method for intensifying pressure in the cylinder that the adjustable pressure-intensified stroke can be obtained, larger driving force can be obtained, downsizing of cylinders is attained, simple structure makes it possible to be inexpensive and to reduce the rate of the occurrence of trouble such as breakdown. In a double-acting pressure intensifying cylinder 30, a first cylinder 10 and a second cylinder 20 are connected via an operation chamber 14 in series. The first fluid chamber 11 is provided with a first piston 12 and the second fluid chamber 21 is provided with a second piston 22. In an operation chamber 14, a rod 13 is slidably inserted. The first fluid chamber 11 has a first fluid supply port 1 and an air port 5, the second fluid chamber 21 has a third fluid supply port 3 and a fourth fluid supply port 4, the operation chamber 14 has a second fluid supply port 2.
    Type: Application
    Filed: March 12, 2003
    Publication date: September 18, 2003
    Inventor: Honda Tohru
  • Patent number: 6561596
    Abstract: A hydraulic brake booster (12) for use in a brake system (10) having a first housing (100) with a first bore (102) separated from a second bore (104). The first bore (102) retains a power piston (118) and the second bore (104) retains a control valve arrangement (170). A push rod (30) of an input arrangement (49) is connected to the power piston (118) and linked to the control valve arrangement (170) by a lever arrangement (50). A second housing (200) encloses the control valve arrangement (170), lever arrangement (50) and a projection (117) that extends from the power piston (118) to define a cavity or relief chamber (202) having a permanent low pressure. The input arrangement (49) supplies the control valve arrangement (170) with an input force in response to a braking force applied to the push rod (30) to regulate the communication of pressurized supply fluid from the second bore (104).
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: May 13, 2003
    Assignee: Robert Bosch Corporation
    Inventors: William John Penninger, Robert Keller Wilson, Richard Becker McClain, Kenneth Scott Towers
  • Patent number: 6502395
    Abstract: The invention relates to a hydropneumatic pressure intensifier comprising a radial seal (24, 27). Said seal is arranged between working pistons (2) and the cylinder bore which accommodates said pressure intensifier or in a bore hole (15) between the working chamber (3) and a storage area (14), whereby the radial seals consist of viscoplastic and flexible synthetic material.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: January 7, 2003
    Assignee: TOX Pressotechnik GmbH & Co., KG
    Inventor: Eugen Rapp
  • Publication number: 20020029569
    Abstract: This invention aims to prevent a core from being pushed back when a hydraulic fluid is compressed by a high load occurring with a molding pressure of molten melt at a casting and pressing time in a core driving cylinder in a die cast machine.
    Type: Application
    Filed: September 10, 2001
    Publication date: March 14, 2002
    Applicant: NAMBU CO., LTD
    Inventors: Kazushi Nomura, Hiroshi Kitamura, Satoshi Komatsu
  • Patent number: 6354082
    Abstract: An intensifier type of fluid actuator using air and water as working fluids therein includes first and second bodies that can be separate components or incorporated into a single structure. The first body includes a first manifold connected by a first tube to a second manifold to define an intensifier chamber, a third manifold connected by a second tube to the second manifold to define a reservoir chamber, and a fourth manifold connected by a third tube to the third manifold to define a work chamber. An intensifier piston is disposed within the intensifier chamber and has an outer surface in sealing and sliding engagement with the first tube. The intensifier rod is secured to the intensifier piston and extends through the second manifold into the reservoir chamber. The intensifier rod is movable through the third manifold into the work chamber. A reservoir piston is disposed within the reservoir chamber and has an outer surface in sealing and sliding engagement with the second tube.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: March 12, 2002
    Assignee: Aries Engineering Company, Inc.
    Inventor: Todd M. Brieschke
  • Patent number: 6282896
    Abstract: A brake system 1 of the invention comprises a brake pedal 2, a booster 3 which boosts the input force applied by the brake pedal 2 and outputs the boosted force, a travel amplifying mechanism 4 which amplifies the travel of an output shaft of the booster 3 and outputs the amplified travel, a master cylinder 5 which develops master cylinder pressure when the output from the travel amplifying mechanism 4 is applied to the master cylinders 5, and wheel cyclinders 6 which develop braking forces when the master cyclinder pressure is introduced into the wheel cyclinders. By the travel amplifying mechanism 4, the travel of the brake pedal 3 in the initial stage of operation is amplified by the travel amplifying mechanism and is then transmitted to the master cylinder 5, whereby the idle stroke of the operating member caused by various idle portions in stroke in the brake system can be effectively shortened.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: September 4, 2001
    Assignee: Bosch Braking Systems Co., Ltd.
    Inventors: Yuji Wachi, Shogo Ogino, Isao Kobayashi
  • Patent number: 6257117
    Abstract: The inside of a cylinder is divided into front and rear cylinder chambers, a primary-side piston and a secondary-side piston, each formed by an annular disc part and an annular tube part are fitted into each cylinder chamber, with the annular tube parts of each loosely fitted together, and the secondary-side piston surrounding an operating piston rod so as to hold the operating piston and being fit into the operating piston. The first front cylinder chamber and the second rear cylinder chamber defined by the primary- and secondary-side pistons are connected by a communicating passageway with a relief valve inserted therein, this relief valve being switched to the open condition by either a prescribed pressure or a valve opening/closing bar that is provided upright on the primary-side piston.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: July 10, 2001
    Assignee: Nambu Co., Ltd.
    Inventor: Ryuzo Yagishita
  • Patent number: 6226993
    Abstract: A fully hydraulic brake booster/master cylinder unit (10) for a vehicle brake system has a housing (12) and a bore (14) which is formed therein and in which is arranged sealingly and displaceably a primary piston (16) which is coupled to an input member (40) for transmitting an actuating force to the primary piston (16). Located in the bore (14) are a first pressure chamber (22), one boundary wall of which is formed by one end wall (20) of the primary piston (16), and a first booster chamber (46), one boundary wall of which is formed by the other end wall (50), located opposite the end wall (20), of the primary piston (16). The first booster chamber (46) has an inlet for hydraulic fluid under pressure which is used for boosting the actuating force. In order to bring about additional brake boosting comfortably and as required, there is arranged in the bore (14) a second booster chamber (48), to which hydraulic fluid under pressure can be supplied independently of the first booster chamber (46).
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: May 8, 2001
    Assignee: Lucas Industries public limited company
    Inventor: Helmut Heibel
  • Patent number: 6012287
    Abstract: A fluid actuator system disposed for internally increasing fluid pressure therein. The system includes a first fluid actuator including a cylinder provided with a first axial bore having a first piston and piston rod reciprocally mounted therein. The first cylinder is provided with first and second inlet and outlet fluid passages communicating into the first axial bore for directing fluid in and out of the first axial bore. A second fluid actuator is provided which has a cylinder provided with a second axial bore having a second piston and piston rod reciprocally mounted therein. The second cylinder is provided with third and fourth inlet and outlet fluid passages communicating into the second axial bore for directing fluid in and out of the second axial. An end closure assembly common to the first and second cylinders for sealing one end of each of the cylinder is provided. The end closure assembly includes structure therein for internally increasing fluid pressure of the fluid actuator system.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: January 11, 2000
    Inventor: James O. Sims
  • Patent number: 6003429
    Abstract: A high speed and high load operable hydraulic drive cylinder system comprises a principal cylinder (3) with a piston (3a)) defining an upper and a lower chamber (3c, 3d) and a piston rod (3b), and a subsidiary cylinder (2) smaller in pressure receiving area than the principal cylinder and a piston (2a) defining an upper and a lower chamber (2c, 2d) and a piston rod (2b) smaller in diameter than the piston rod (3b).
    Type: Grant
    Filed: February 11, 1998
    Date of Patent: December 21, 1999
    Assignees: Komatsu Ltd., Komatsu Industries Corporation
    Inventors: Hideaki Nakabayashi, Hitoshi Sawamura
  • Patent number: 5983637
    Abstract: A brake booster for a brake system of a vehicle, wherein the brake booster is in fluid communication with a source of pressurized fluid. The brake booster includes a housing having a bore formed therein and a conduit formed therein being in fluid communication with the bore and the source of pressurized fluid. The brake booster includes first and second pistons slidably disposed within the bore of the housing. The bore, the first piston, and the second piston define a fluid chamber in fluid communication with the conduit formed in the housing, wherein the volume of the chamber is defined by the position of the first piston relative to the second piston. The brake booster further includes a valve selectively preventing fluid flow in a direction from the chamber to the source of pressurized fluid via the conduit.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: November 16, 1999
    Assignee: Kelsey-Hayes Company
    Inventors: Mark D. Lubbers, Herbert L. Linkner, Jr., Gregory J. Krawczyk, Richard J. Barron
  • Patent number: 5943862
    Abstract: A machine tool which operates with a hydropneumatic pressure intensifier whose step piston is braked hydraulically in particular towards the end of its stroke by forcing hydraulic fluid from a braking cavity formed during the stoke via a choke point.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: August 31, 1999
    Assignee: Tox Pressotechnik GmbH
    Inventor: Viktor Malina
  • Patent number: 5894729
    Abstract: This invention is a heat engine operating on the afterburning Ericsson cycle whose principle is heat addition to the cycle by an afterburner in which fuel is burned with the low-pressure air working fluid exhausted by the expander. The resulting combustion gases are used in a countercurrent heat exchanger continually heating (1) the air expanding in the expander and (2) further upstream the high-pressure air (compressed by the compressor) in the regenerator. The ideal efficiency of this cycle is the Carnot cycle efficiency between the same top and bottom temperatures. Practical engines are more efficient than those in which heat addition takes place upstream of the expander. All moving parts are only exposed to clean air, and expander valves can be operated at temperatures comparable to current internal combustion engines. Liquid or gaseous fuels can be used and control of speed and power is simple, based on keeping engine temperatures constant.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: April 20, 1999
    Inventor: Richard A. Proeschel
  • Patent number: 5890363
    Abstract: In a brake-pressure producing device of the present invention, a power piston 10 of a hydraulic booster 2 comprises a stepped piston including a large-diameter portion 10a on which fluid pressure of a power chamber 30 is exerted and a small-diameter portion 10b having the same diameter as the master cylinder piston 53. Both the pistons 10, 53 are interlocked with each other through an aligning rod 62. The pressurized fluid of the power chamber 30 is introduced into an annular chamber 51 formed on the circumference of the small-diameter portion 10b and the fluid pressure of the pressurized fluid is exerted on a stepped portion 10c between the large-diameter portion 10a and the small-diameter portion 10b in the direction opposite to the direction of the fluid pressure of the power chamber 30.
    Type: Grant
    Filed: November 10, 1997
    Date of Patent: April 6, 1999
    Assignee: Jidosha Kiki Co., Ltd.
    Inventors: Michio Kobayashi, Masahiro Shimada
  • Patent number: 5865088
    Abstract: A high speed safety circuit arrangement is provided for a hydraulic press which is driven by a hydraulic cylinder assembly constituted by a principal cylinder unit and a subsidiary cylinder unit. The circuit arrangement comprises a servo valve disposed in one of at least a pair of conduit lines for supplying a pressure fluid from a source thereof into the principal cylinder unit and the subsidiary cylinder unit, a first logic valve disposed in the other of the conduit lines and switched on and off and by the servo valve and a first electromagnetic valve for opening and closing that other conduit line, a second and a third logic valve of which each is switched on and off, and at least one is selectively actuatable, by a second electromagnetic valve to interconnect an upper and a lower chamber of the principal cylinder unit in a hydraulic circuit.
    Type: Grant
    Filed: December 31, 1997
    Date of Patent: February 2, 1999
    Assignees: Komatsu Ltd., Komatsu Industries Corporation
    Inventors: Hideaki Nakabayashi, Hitoshi Sawamura
  • Patent number: 5865029
    Abstract: An intensifier type of fluid actuator includes multiple sensors for sensing various operational characteristics of the intensifier. The intensifier includes a first manifold connected by a first tube to a second manifold to define an intensifier chamber, a third manifold connected by a second tube to the second manifold to define a reservoir chamber, and a fourth manifold connected by a third tube to the third manifold to define a work chamber. An intensifier piston is disposed within the intensifier chamber and has an intensifier rod secured thereto that extends through the second manifold into the reservoir chamber and through the third manifold into the work chamber. A reservoir piston is disposed within the reservoir chamber and includes an opening formed therethrough, through which the intensifier rod extends. The second body includes a fifth manifold connected by a fourth tube to a sixth manifold to define a piston chamber.
    Type: Grant
    Filed: July 11, 1997
    Date of Patent: February 2, 1999
    Assignee: Aries Engineering Company, Inc.
    Inventor: Todd M. Brieschke
  • Patent number: 5836161
    Abstract: A hydro-pneumatic pressure booster is proposed in which the reservoir chamber is limited by an elastic partition wall instead of a sliding piston.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: November 17, 1998
    Assignee: Tox Pressotechnik GmbH
    Inventor: Viktor Malina
  • Patent number: 5735124
    Abstract: A brake system for use in connection with a vehicle including a hydraulic internally boosted master cylinder, a hydraulic pump, and hydraulic brakes wherein the master cylinder controls hydraulic fluid pressure to the brakes and has a primary or sensing piston, a modulator stem, and a secondary pistons, with the sensing piston responsive to a mechanical input force to urge the secondary piston forwards increasing the hydraulic fluid pressure applied to the brakes. In a second embodiment, the internally boosted master cylinder further includes a tertiary piston movable by hydraulic pressure between retracted and extended positions and biased toward the retracted position by a tertiary piston return spring. The tertiary piston controls hydraulic pressure applied to one or more brakes independent of the brakes controlled by the secondary piston.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: April 7, 1998
    Assignee: Commercial Intertech Corp.
    Inventors: Frederick W. Cords, David E. Frye
  • Patent number: 5649424
    Abstract: A two-stage pressure cylinder having a work cylinder (17,100) with a work piston (18,108), and piston rod (20,110) for contact with a work piece, in which the work piston is movable, an oil cylinder (56,116) to contain hydraulic fluid (H), an oil piston (58,118) in the oil cylinder, an air cylinder (72,122), an air piston (74,124) in the air cylinder, and an air piston rod (80,126) connected to the air piston and communicating with the hydraulic fluid, and valves allowing hydraulic fluid to pass from the oil cylinder to the work cylinder to operate the work piston, and on a reverse stroke flow being operable to permit return flow of fluid from the work cylinder into the oil cylinder.
    Type: Grant
    Filed: May 7, 1996
    Date of Patent: July 22, 1997
    Inventor: Viljo K. Valavaara
  • Patent number: 5582009
    Abstract: An intensifier type of fluid actuator includes a body including a first manifold connected by a first tube to a second manifold to define an intensifier chamber, a third manifold connected by a second tube to the second manifold to define a reservoir chamber, and a fourth manifold connected by a third tube to the third manifold to define a work chamber. A reservoir piston is disposed within the reservoir chamber and has an outer surface in sealing and sliding engagement with the second tube. The reservoir piston includes an inner surface defined by a central opening formed therethrough which extends from a first end of the reservoir piston adjacent to the second manifold to a second end of the reservoir piston adjacent to the third manifold. A passageway is formed in the reservoir piston which extends from the inner surface to the outer surface, thereof.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: December 10, 1996
    Assignee: Aries Engineering Company, Inc.
    Inventor: Todd M. Brieschke
  • Patent number: 5483796
    Abstract: A second pressure intensifying cylinder subchamber is employed for moving a pressure intensifying piston toward the other side, and the necessity for a control valve with a throttle is thereby eliminated. The pressure intensifying piston is incorporated integrally into a fluid cylinder, and, hence, the fluid cylinder can be installed in an even narrow space. A main cylinder chamber communicates with a pressure intensifying cylinder chamber in the interior of the fluid cylinder, and it is therefore possible to prevent such a situation that a high-pressure fluid sprouts out. A structure of the fluid cylinder is thus simplified enough to reduce the costs, and the safety is improved.
    Type: Grant
    Filed: April 12, 1995
    Date of Patent: January 16, 1996
    Assignee: Ando Seisakujo Co., Ltd.
    Inventor: Etuo Ando
  • Patent number: 5381661
    Abstract: The invention relates to a hydraulic pressure transformer, wherein a storage chamber and a work chamber are connected with each other via an overflow bore into which a plunger piston dips to generate a pressure stage and thereby separates the two chambers for generating a high pressure in the work chamber. An additional connecting conduit with a check valve is provided between the work chamber and the storage chamber.
    Type: Grant
    Filed: July 2, 1993
    Date of Patent: January 17, 1995
    Assignee: TOX-Pressotechnik GmbH
    Inventor: Viktor Malina
  • Patent number: 5377488
    Abstract: A hydro-pneumatic pressure transformer with a storage piston fixed between storage oil and compressed air, which furthermore is centrally penetrated by a plunger piston, wherein, for the separation of oil from water, relief grooves are provided on the jacket face as well as in the wall of the central bore, which are connected with each other and are pressure-relieved via a ventilating bore leading to the exterior.
    Type: Grant
    Filed: July 2, 1993
    Date of Patent: January 3, 1995
    Assignee: Tox-Pressotechnik GmbH
    Inventor: Viktor Malina
  • Patent number: 5330259
    Abstract: A brake system (10) comprising: a master cylinder (20) including a primary (24) and a secondary (26) chamber and a reservoir (26); an accumulator (40), a pump (42) having first inlet port connected to a reservoir (26) of the master cylinder (20) and the second outlet port (b) connected to the accumulator (40), a motor (50) for selectively driving the pump as a function of system pressure, a pressure boost mechanism (60) connected to the accumulator (40) and the primary and secondary chambers of the master cylinder for generating a boosted pressure at a fixed multiple of the pressure in either the primary or secondary master cylinder chambers.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: July 19, 1994
    Assignee: AlliedSignal Inc.
    Inventors: Seth C. Ravndal, Daniel J. Patient