Having Piston Rod Extending Through Ends Of Chamber Patents (Class 188/312)
  • Patent number: 11293516
    Abstract: A hydraulic damper includes a cylinder containing a hydraulic fluid and a piston affixed to a piston rod that extends out from one end of the cylinder through an end cap seal and that divides the cylinder into two chambers. The piston includes a port extending longitudinally through it where the port defines a valve seat. Inserted in the port is a spring-loaded valve member having a central bore extending longitudinally through it of a selected diameter that sets the rate of extension and return of the piston rod during use.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: April 5, 2022
    Assignee: ROM Acquisition Corporation
    Inventor: Avraham Y. Levi
  • Patent number: 10654521
    Abstract: The invention concerns an axle unit, in particular for use in utility vehicles with a hydraulic or compressed air system, comprising an axle tube and an actuation unit, wherein the axle tube has a receiving opening, wherein the actuation unit has a cylinder, a piston rod and a piston, wherein the piston divides a chamber of the actuation unit into a first chamber region and a second chamber region, wherein the piston rod is in engagement with the piston and is designed such that it can be brought into engagement with a leg of the axle unit in order to transmit a force to the leg, wherein the actuation unit is arranged in the receiving opening of the axle tube and is secured against moving transversely relative to a tube axis and at least in one direction parallel to the tube axis.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: May 19, 2020
    Assignee: SAF-HOLLAND GmbH
    Inventor: Armin Christ
  • Patent number: 10519938
    Abstract: A spring device for the motion drive of a movable component from a rest position into a displaced position includes a gas spring and a preloaded spring, the movable component being loaded into the displaced position by a preloaded spring. The gas spring includes a pressurized gas-filled cylinder with a first end closed by a first end plate and a second end closed by a second end plate. A piston divides the interior of the cylinder into a first working chamber and a second working chamber. The piston having a first piston rod extending through the first working chamber and through the first end plate in a sealed manner, a free end of the first piston rod being fixed to the movable component or a stationary component, and a second piston rod extending through the second working chamber and through the second end plate in a sealed manner.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: December 31, 2019
    Assignee: STABILUS GMBH
    Inventors: Michael Hewel, Karl-Heinz Darscheid
  • Patent number: 10458507
    Abstract: A front fork includes a fork main body, a damper cartridge, and a closing member. The damper cartridge includes a cylinder, a piston mounted on a piston rod, and a rod guide which guides the piston rod and to which a fluid filling port that allows the outside of the cylinder to communicate with the fluid chamber is provided. The closing member is provided on the rod guide and closes the fluid filling port.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: October 29, 2019
    Assignee: KYB MOTORCYCLE SUSPENSION CO., LTD.
    Inventor: Takeshi Tomiuga
  • Patent number: 10352058
    Abstract: A rigid substructure (12) tied to a restrained column (16) at different floors undergoes rigid body rotation due to lateral dynamic loading. Flexural members (18) that are connected to the substructure (12) and another anchor column (14) resist the rigid body rotation and undergo vertical deflections. Damped diagonals (20) connected to common nodes of the rigid substructure and flexural members, for one embodiment, receive amplified displacements and more effectively dissipate energy. Flexural members restore the structure to the unloaded position. The system does not require moment connections and can work with flexure induced in simply supported beams. The system is highly effective and may remain elastic under maximum considered earthquake ground motions.
    Type: Grant
    Filed: February 19, 2018
    Date of Patent: July 16, 2019
    Inventor: Saeed Towfighi
  • Patent number: 10081921
    Abstract: A vibration damping device for suspension-bridge type cables includes first and second linear dampers supported by a generally V-shaped support member mounted to the bridge deck.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: September 25, 2018
    Assignee: SOLETANCHE FREYSSINET
    Inventor: Erik Mellier
  • Patent number: 10053347
    Abstract: A cargo vehicle includes a hydraulic pump driven by an engine, a cargo handling apparatus operated by hydraulic oil from the hydraulic pump, a cargo operating unit for performing an instruction operation to operate the cargo handling apparatus, an electromagnetic proportional control valve disposed between the hydraulic pump and the cargo handling apparatus, a valve controller that controls the electromagnetic proportional control valve depending on an operation state of the cargo operating unit, and a revolution detector that detects a revolution of the engine, wherein the valve controller controls the electromagnetic proportional control valve such that an opening degree of the electromagnetic proportional control valve is limited for a certain time when the revolution of the engine detected by the revolution detector is lower than a predetermined value.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: August 21, 2018
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Norihiko Kato, Yukikazu Koide
  • Patent number: 9890828
    Abstract: Generally described, aspects of the disclosed subject matter are directed to through-shaft dampers. In accordance with aspects of the present disclosure, the through-shaft dampers generally include a shaft having a piston traveling within a body, a first chamber for a damping fluid, and a second chamber for a gas. The chambers are separated by a movable wall associated with an insert and configured to provide a volumetric change of the second chamber that is inverse to a volumetric change of the damping fluid. The insert is configured such that the sealing surfaces of the movable wall do not interface the shaft during use of the damper. In this regard, a significant reduction in the total displacement traveled by the seals is realized.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: February 13, 2018
    Assignee: TeraFlex, Inc.
    Inventor: Christopher Paul Cox
  • Patent number: 9617697
    Abstract: A device (22) for damping vibrations in a cable (16) comprises an arm (25) oscillating about a pivot (26), a first damper (30) for damping the oscillations of the arm, a coupler (27) attached to the cable, a second, linear-travel damper (31) having an upper end connected to the coupler and a lower end connected to the arm, and a guide (28) for sliding the coupler with respect to the arm parallel to the travel of the second damper such that the movements of the cable that are transverse to the travel of the second damper are transmitted to the arm independently of the second damper.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: April 11, 2017
    Assignee: SOLETANCHE FREYSSINET
    Inventors: Jérôme Stubler, Erik Mellier
  • Patent number: 9534435
    Abstract: Damper (1) comprising a cylinder (2) containing a damping fluid, at least one piston (3) translatable within said cylinder and defining two damping chambers (4, 5), and a rod (6) for controlling the movement of said at least one piston (3) within said cylinder (2), said damper further comprising at least one first and at least one second narrow passages (7, 8) through which said damping fluid is forced to pass from one to the other of said two damping chambers (4, 5) when said control rod is controllably moved within said cylinder (2), characterized in that said at least one piston (3) is translatable with respect to said control rod (6) on the basis of the speed of said control rod (6), between a first position (P1), in which said at least one piston (3) prevents said damping fluid from passing through said at least one first narrow passage (7) and a second position (P2) in which said at least one piston (3) allows said damping fluid to pass through said at least one first narrow passage (7), and in that it
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: January 3, 2017
    Assignee: FARINGOSI HINGES S.R.L.
    Inventor: Massimo Dora
  • Patent number: 8960385
    Abstract: A pull shock damper for a bicycle comprising a spring device and a damper device, the spring device comprising a positive spring and a gas-operated negative chamber. The damper device comprises a first oil chamber and a second oil chamber connected therewith. The negative chamber abuts the first oil chamber via a piston. A tubular structure extends from the piston through the negative chamber interior up to the end of the negative chamber. The piston rod of the piston extends through the first oil chamber to the exterior.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: February 24, 2015
    Assignee: DT Swiss Inc.
    Inventor: Martin Achenbach
  • Patent number: 8881876
    Abstract: A device for use in the control of mechanical forces is provided. The device includes first and second terminals for connection to components in a system for controlling mechanical forces and independently moveable. The device further comprises a hydraulic device connected between the terminals and containing a liquid. The hydraulic device is configured to produce upon relative movement of the terminals, a liquid flow to generate an inertial force due to the mass of the liquid to control the mechanical forces at the terminals such that they are substantially proportional to the relative acceleration between the terminals.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: November 11, 2014
    Assignees: Cambridge Enterprise Limited, McLaren Racing Limited
    Inventors: Malcolm C. Smith, Neil E. Houghton, Peter J. G. Long, Anthony Richard Glover
  • Patent number: 8839919
    Abstract: A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit for absorbing an impact force without bending the reciprocating rod. The shock absorber has a hollow rod provided with a through hole. The hollow rod is mounted within an outer cylindrical body. An accommodating space is formed between the hollow rod and the outer cylindrical body. A spring force toward one end portion side of the hollow rod is applied to the outer cylindrical body by a compression coil spring. An annular piston provided in the hollow rod partitions the accommodating space into two liquid chambers. When the impact force is applied to the hollow rod, the liquid flows from one liquid chamber to another liquid chamber through a gap, whereby a resistance force is applied to the hollow rod.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: September 23, 2014
    Assignee: Koganei Corporation
    Inventors: Akiyoshi Horikawa, Yuta Ohmura
  • Patent number: 8628100
    Abstract: A stabilizing device for axles of vehicles, such as motor vehicles, trailers, semi-trailers, or the like, including a hollow cylinder unit, which comprises a hollow cylinder containing a fluid therein, a piston unit with a piston which is arranged in the hollow cylinder and divides the hollow cylinder into at least two chambers, wherein the piston unit can slide relative to the hollow cylinder unit in that said piston unit can be moved from an original position to a deflected position, a pre-tensioning device which tensions the piston unit in the direction of the original position, and a control or regulating device which controls or regulates the fluid flow into/out of the chambers.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: January 14, 2014
    Assignee: SAF-HOLLAND GmbH
    Inventors: Josef Büttner, Lutz Böhme
  • Patent number: 8584817
    Abstract: A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit to prevent a bending moment from being applied to the reciprocating rod in absorbing an impact force. The shock absorber has a hollow rod and an outer cylindrical body mounted axially movably relatively to and outside the hollow rod. An accommodating space is formed between the hollow rod and the outer cylindrical body. The hollow rod carries an annular piston, which partitions the accommodating space into two liquid chambers. A compression spring biases the outer cylindrical body toward one end of the hollow rod. When an impact forces the outer cylindrical body toward the other end of the hollow rod, liquid flows from one of the liquid chambers to the other through a gap, so that a resistance force is applied to the annular piston.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: November 19, 2013
    Assignee: Koganei Corporation
    Inventors: Akiyoshi Horikawa, Yuta Ohmura
  • Patent number: 8534433
    Abstract: An elastic connection element with variable rigidity for coupling together components that are spaced from each other. The connection element is a tubular component with coupling points which fix the components to the element. The rigidity of the element, in the state of maximum rigidity, is determined substantially by the coupling points. These are formed by a receiving eyelet and an elastomeric bush bearing press-fit therein. The region located between the coupling points forms a piston/cylinder unit, the interior of which comprises at least two chambers that are separated by the piston and which receive a hydraulic or a pneumatic medium. The chambers are interconnected with one another by a connection line containing a controllable valve. By at least partially opening the valve, the rigidity of the connection element can be reduced in relation to the state of maximum rigidity.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: September 17, 2013
    Assignee: ZF Friedrichshafen AG
    Inventor: Klaus Kramer
  • Patent number: 8434600
    Abstract: Damping device for damping motion of movable furniture parts. A piston mounted in housing in longitudinally displaceable manner which, due lo displacement, forms two variable-size working chambers on opposite sides with damping medium. Via overflow-connection, throttled transfer of damping medium is possible between two working chambers. Piston plunger, fed selectively, is connected on one side of pislon. Via the outer end of piston plunger, the motion of the furniture part to be damped is transferred to the piston. On side of piston, an elongated adjustment shaft is connected to the piston plunger. Free end of plunger is fed in sealed manner out of front face lying opposite front face that is sealed on the piston plunger side. The end of adjustment shaft engages with a passage duct connecting two working chambers and forms a variable-sized throttle cross section in the passage duct, making adjusting motion of shaft relative to piston.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: May 7, 2013
    Assignee: Grass GmbH & Co. KG
    Inventors: Markus Herper, Gabriele Schneider
  • Patent number: 8382076
    Abstract: A support column with a vertical tube has a coaxially installed gas spring including a cylinder divided by a piston into first and second working chambers. A piston rod passes through the second working chamber in a sealed manner to the outside, where it is attached to a bottom support piece of the vertical tube. The cylinder projects out of the vertical tube and is guided with freedom to slide back and forth in a guide sleeve installed in the end of the vertical tube opposite the bottom support piece. A connection between the first and second working chambers can be blocked by a manually actuatable valve. A second valve between the chambers, which is closed when the gas spring is under load, can be switched to the open position after the load on the gas spring has been absent for a certain period of time.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: February 26, 2013
    Assignee: Stabilus GmbH
    Inventors: Matthias Etzkorn, Manfred Metzdorf, Thomas Müller
  • Patent number: 8342301
    Abstract: A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit to prevent a bending moment from being applied to the reciprocating rod in absorbing an impact force. The shock absorber has a hollow rod provided with a through hole and an outer cylindrical body mounted outside the hollow rod so as to be movable axially relatively and attached to the reciprocating unit. An accommodating space is formed between the hollow rod and the outer cylindrical body. A spring force in a direction of being relatively directed to one end portion side of the hollow rod is applied to the outer cylindrical body by a compression coil spring. An annular piston for partitioning an accommodating space into two liquid chambers is provided in the hollow rod. When the impact force is applied to the hollow rod so as to be slid to the hollow rod, the liquid flows from one liquid chamber to another liquid chamber through a gap, whereby a resistance force is applied to the annular piston.
    Type: Grant
    Filed: March 1, 2007
    Date of Patent: January 1, 2013
    Assignee: Koganei Corporation
    Inventors: Akiyoshi Horikawa, Yuta Ohmura
  • Patent number: 8251355
    Abstract: A suspension spring and a double-rod damper are installed in the interior of a front fork which comprises a body-side tube and a wheel-side tube. The double-rod damper comprises a piston housed in a cylinder, and an upper rod and a lower rod connected to the piston. The upper rod is formed to have a smaller diameter than the lower rod. By providing an orifice which allows working oil in an upper oil chamber formed around the upper rod to flow into a reservoir while causing the pressure in the upper oil chamber to increase, expansion and contraction of air bubbles mixed into working oil in the cylinder is prevented, thereby improving the response of a damping force generated in the front fork.
    Type: Grant
    Filed: April 16, 2009
    Date of Patent: August 28, 2012
    Assignee: Kayaba Industry Co., Ltd.
    Inventors: Takeshi Tomiuga, Yasuhiro Kitamura, Yuki Amano, Masato Kobayashi
  • Patent number: 8215620
    Abstract: Self-pumping spring and damper unit (13) with automatically activated ride level control system for chassis of vehicles having a pump which is driven as a result of the distance between the articulation points (14, 15) which changes as a result of the spring compression and spring extension of the vehicle, wherein an elastic connecting element (35) is arranged between at least one pump part (33) and the associated articulation point (14) in such a way that it at least partially elastically compensates the distance between the pump parts (32, 33) which changes when the vehicle experiences spring compression and spring extension.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: July 10, 2012
    Assignee: Continental AG
    Inventor: Hans-Peter Krauss
  • Patent number: 8196722
    Abstract: A damper includes a cylinder tube having a first end connected to one portion of a member of an object for damping, and a fixing rod guide arranged to close a second end of the cylinder tube; a movable rod guide fitted on the first end of the cylinder tube; a main piston rod extending from the piston side, the piston fitted in the cylinder tube and passing through the fixing rod guide; a sub-piston rod extending on the piston side and passing through the movable rod guide; and a spring normally biasing the movable rod guide toward the piston. A damping force generation oil passage is arranged to connect first and second oil chambers in a cylinder tube defined by the piston. The number of parts of a through-rod type damper is reduced to simplify a construction thereof and to make the damper compact.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: June 12, 2012
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Masahiro Satou, Seiji Sawai, Yutaka Yamazaki, Katsuhiro Kondou
  • Patent number: 8181756
    Abstract: A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit to prevent a bending moment from being applied to the reciprocating rod in absorbing an impact force. The shock absorber has a hollow rod and an outer cylindrical body mounted axially movably relatively to and outside the hollow rod. An accommodating space is formed between the hollow rod and the outer cylindrical body. A spring force in a direction of being relatively directed to one end portion side of the hollow rod is applied by a compression spring to the outer cylindrical body. The hollow rod is provided with an annular piston which partitions the accommodating space into two liquid chambers. When an impact force in a direction of being relatively directed to the other end side of the hollow rod is applied to the outer cylindrical body, liquid flows from one of the liquid chambers to the other through a gap, so that a resistance force is applied to the annular piston.
    Type: Grant
    Filed: March 1, 2007
    Date of Patent: May 22, 2012
    Assignee: Koganei Corporation
    Inventors: Akiyoshi Horikawa, Yuta Ohmura
  • Patent number: 8087500
    Abstract: A vibrational energy absorbing apparatus 1 includes: a reciprocating member 2 which is reciprocatable in H directions between positive and negative maximum displacement positions D±max with respect to an origin position O; a damping-force generating means 3 for generating a damping force R with respect to the reciprocating motion of the reciprocating member 2 in the H directions; and a controlling means 4 for controlling the damping-force generating means 3 so as to cause the damping-force generating means 3 to generate a fixed damping force R in the respective movement of the reciprocating member 2 in the H direction from the positive and negative maximum displacement position D±max to the origin position O in the reciprocating motion thereof in the H directions, while causing the damping-force generating means 3 to substantially not generate the damping force R in the respective movement of the reciprocating member 2 in the H direction from the origin position O to the positive and negative maximum displace
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: January 3, 2012
    Assignee: Oiles Corporation
    Inventors: Hirokazu Iemura, Ikuo Shimoda, Osamu Kochiyama
  • Patent number: 8047343
    Abstract: A flow damper used in an auto-close mechanism of a sliding rail assembly is disclosed to include a first flow cylinder that has coupling grooves provided at one lateral side, and a second flow cylinder that has coupling blocks provided at one side and connectable to the coupling grooves to secure the first and second flow cylinders in parallel in one of the first condition where the piston rods of the first and second flow cylinders extend in same direction and the second condition where the piston rods of the first and second flow cylinders extend in reversed directions.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: November 1, 2011
    Assignee: KV IP Holdings Ltd.
    Inventor: Yung-Liang Chen
  • Patent number: 7926795
    Abstract: A front fork comprises a telescopic tube (1, 32) in which a damper cylinder (3) generates a damping force. The damper cylinder (3) comprises a guide sleeve (4) and a free piston (6) having an inner circumference which slides on the outer circumference of the guide sleeve (4) and an outer circumference which slides on the inner circumference of the damper cylinder (3). A lateral through-hole (11) formed in the guide sleeve (4) connects an auxiliary reservoir (R3) formed outside the damper cylinder (3) and an oil reservoir (R2) via a flow path (12) formed in the guide sleeve (4) according to the displacement position of the free piston (6), thereby reducing the number of seal members required to be fitted on the outer circumference of the free piston (6) and enabling the free piston (6) to slide smoothly even when the telescopic tube (1, 32) suffers a bending force.
    Type: Grant
    Filed: February 25, 2008
    Date of Patent: April 19, 2011
    Assignee: Kayaba Industry Co., Ltd.
    Inventors: Ken Furuya, Kiyoshi Kubo
  • Publication number: 20110005877
    Abstract: An improvement to damping cylinders in which the damping fluid needs to be separated from a gas is disclosed. In particular, an annular bladder is used. An annular bladder allows for a control shaft to extend at least a portion of the length of the damping cylinder. This configuration effectively and simply reduces most issues that result from when an IFP is used for the same purpose.
    Type: Application
    Filed: September 17, 2010
    Publication date: January 13, 2011
    Applicant: FOX FACTORY, INC.
    Inventor: William M. Becker
  • Patent number: 7779974
    Abstract: A vehicle suspension spring system for a vehicle wheel station includes a hydraulic cylinder or strut having a piston which divides the cylinder volume into a main oil volume and an annular oil volume. The main oil volume communicates via a first oil passage with a first accumulator having a main gas volume. The annular oil volume communicates via a second oil passage with a second accumulator having an auxiliary gas volume. The oil in each accumulator is separated from the gas by a separator piston or diaphragm. A third oil passage with an isolating valve interconnects said first and second oil passages. Operation of the isolating valve is regulated by a controller. At least one sensor for sensing a parameter associated with vehicle attitude is connected to the controller. The controller is operable for switching the isolating valve between open and closed positions for altering spring stiffness of the strut in response to said sensed vehicle attitude parameter when the vehicle is in motion.
    Type: Grant
    Filed: August 21, 2006
    Date of Patent: August 24, 2010
    Assignee: Technology Investments Limited
    Inventors: Sean Timoney, John Holland
  • Patent number: 7658023
    Abstract: This invention relates to a bucket (12) for a mechanical shovel (10). The bucket has a hollow body (16) provided with an inlet (14) for receiving material into its interior and an outlet (15) for discharging material therefrom. A door (18) is secured to the body and is movable between a closed condition in which it closes the outlet, and an open condition in which it permits discharge under gravity of material from the bucket. A buffering device in the form of a working fluid containing telescopically extensible and retractable piston-and-cylinder assembly (22) is operatively connected between the body and the door of the bucket for buffering movement of the door relative to the body.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: February 9, 2010
    Inventor: Grant Alan David Wallett
  • Patent number: 7600617
    Abstract: An apparatus for controlling relative movement between two interconnected bodies includes a first end cap, a second end cap having an opening, a sleeve interconnecting the end caps to define a chamber between the sleeve and the end caps, a piston assembly including a piston rod extending through the opening of the second end cap, a piston connected to the piston rod, received in the chamber to define at least two fluid chambers on opposed sides of the piston, and a plurality of rollers carried by the piston for rolling engagement with the sleeve. A fluid flow path provides communication between the fluid chambers and provides a restricted fluid flow rate therethrough to control the rate of fluid transfer between the fluid chambers and permit fluid pressure to increase in a chamber into which the piston is being moved to provide a force on the piston opposing its movement.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: October 13, 2009
    Assignee: General Manufacturing Systems, Inc.
    Inventors: Gerald E. Mueller, Gene B Slachta, Douglas W. King
  • Patent number: 7575110
    Abstract: A both-side rod type damper (11) is arranged in a storage chamber (40) formed inside an inner tube (2) and an outer tube (3), rods (31) and (32) of the damper (11) are coupled so as to move by the same quantity in accordance with the extending or retracting operation of a front fork, a bearing (5) for slidably supporting the rod (32) is provided at a cylinder end, the bearing (5) is movable by a predetermined quantity in a radius direction and an axial direction of the rod relative to the cylinder, and the bearing (5) moves toward the inside of the cylinder to communicate the oil chamber R2 with the storage chamber (40) when the pressure of the storage chamber (40) is higher than the pressure of the oil chamber R2 in the damper (11), and the communication is shut down when the movement is made to the opposite side thereof.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: August 18, 2009
    Assignee: Kayaba Industry Co., Ltd.
    Inventor: Tsutomu Yoshimoto
  • Publication number: 20090038898
    Abstract: Disclosed is a vibration damper comprising a cylinder in which a piston rod is guided in an axially movable manner. A first piston is mounted stationarily on the piston rod while a second piston that is equipped with at least one valve disk biased by a spring assembly is mounted on the piston rod so as to be axially movable counter to a force of at least one support spring. The spring assembly is provided with at least one spring plate on which the spring assembly rests. The second piston is retained by a fixing sleeve which supports the at least one spring plate. The structural unit encompassing the fixing sleeve and the at least one spring plate is fitted with an axially effective separating joint for a locking connection inside the structural unit. The entire structural unit can be axially displaced towards the at least one support spring.
    Type: Application
    Filed: August 18, 2006
    Publication date: February 12, 2009
    Applicant: ZF Friedrichshafen AG
    Inventors: Bernd Zeissner, Andreas Foerster, Frank Gundermann, Steffen Heyn, Anton Krawczyk, Uwe Boecker, Thomas Thein, Wolfgang Breun, Herbert Bies, Holger Beyer, Ludwig Gampl, Heinz-Joachim Gilsdorf, Klaus Sauer
  • Publication number: 20080217127
    Abstract: In a shock absorber (D), a rod (3) projects axially from a cylinder (1) housed in an outer tube (2) to the exterior of the outer tube (2). A rod guide (4, 11) supports the outer circumference of the rod (3) so as to be free to slide. The rod guide (4, 11) also closes openings of the cylinder (1) and the outer tube (2). The rod guide (4, 11) comprises a cylindrical part (4a, 11a) which is inserted into the cylinder (1). By inserting a cylindrical spacer (5, 12) between the cylindrical part (4a, 11a) of the rod guide (4) and the inner circumference of the cylinder (1) so as to compensate for a gap therebetween, plural shock absorbers (D) comprising cylinders (1) of different inner diameters can be manufactured using rod guides (4, 11) of an identical size.
    Type: Application
    Filed: March 4, 2008
    Publication date: September 11, 2008
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventor: Chikatoshi Abe
  • Patent number: 7377372
    Abstract: A telescopic fork leg with damping system comprising piston and piston rod arrangements. The arrangements perform longitudinal shift motions in a medium-containing chamber. The chamber is situated in a tubular part belonging to the damping system. The piston rod arrangement is designed so as in the chamber, with its parts present therein, to have substantially constant volume regardless of the shift motions. Substantial displacement creation is thereby prevented. Moreover, the medium strives to assume and maintain a particular pressure, preferably a positive pressure, on the low-pressure side of the piston arrangement. Positive pressure build-up is therefore present in the damping system and the pressure on the low-pressure side does not need to be lower than the system pressure. A valve arrangement for handling a displacement can therefore be eliminated and the telescopic fork leg can be given an advantageous and easy-to-use structure with, for example, adjustment facilities for leak flows.
    Type: Grant
    Filed: December 5, 2005
    Date of Patent: May 27, 2008
    Assignee: Öhlins Racing AB
    Inventor: Magnus Wallén
  • Patent number: 7316303
    Abstract: A mechanical device for use in the control of mechanical forces. The device comprising first and second terminals which, in use, are connected to components in a system for controlling mechanical forces. These terminals are moveable with respect to one another. The device further comprises means connected between the terminals to control the mechanical forces at the terminals. These mechanical forces are proportional to the relative acceleration between the terminals, wherein the proportionality term is either a fixed constant or a variable function.
    Type: Grant
    Filed: July 3, 2002
    Date of Patent: January 8, 2008
    Assignee: Cambridge University Technical Services, Ltd.
    Inventor: Malcolm Clive Smith
  • Patent number: 7314124
    Abstract: A damping apparatus for damping vibrations in a vibrating system including a piston which is reciprocally movable in a hydraulic fluid filled damper chamber, piston movement in either direction of movement being resisted by fluid pressure in the damper chamber behind the piston, which resistance provides damping forces which act to oppose piston movement, the piston being connected to one component of the vibrating system and the damping chamber being connected to a second component of the vibrating system, characterised in that the fluid at at least a first side of the piston acts on a movable part which is movable in response to changing fluid pressure in the damper chamber at the first side of the piston as the piston moves, the movable member providing a relief volume for the fluid into which and from which fluid may flow from and towards the first side of the piston without passing to an opposite second side of the piston.
    Type: Grant
    Filed: November 18, 2005
    Date of Patent: January 1, 2008
    Assignee: Westland Helicopters Limited
    Inventors: Gerald Henry Martyn, Andrew Alan Lord, Rebecca Diana Brodie
  • Patent number: 7264095
    Abstract: A vibration and displacement damper includes a plunger piston (10) sliding with a slight clearance inside a guiding cylinder (20). The plunger piston includes over a part of its length a piston ring (12) sliding inside a main chamber (13) provided in the cylinder, the ring including calibrated through-orifices (14) for a high-viscosity fluid filling the chamber on both sides of the ring. The device is intended to damp vibrations and displacements, in particular of cable stays.
    Type: Grant
    Filed: April 20, 2004
    Date of Patent: September 4, 2007
    Assignee: Enidine GmbH
    Inventor: Bruno Domange
  • Patent number: 7234574
    Abstract: There is disclosed a damping coefficient switching-type hydraulic damper that may automatically switch a damping coefficient without needing supply of energy from the outside at all, and also may always surely exert an energy absorption capacity greater than that of a typical hydraulic damper. While a piston is moving in a direction A, a mechanical drive means composed of a straight gear and a crank mechanism allows an on-off control operation valve, that is, a flow regulating valve to be placed in a closed state, and a damping coefficient is switched to a maximum value Cmax. When a movement of the piston is turned in a direction B at a left-side maximum point of amplitude, the mechanical drive means works to once open the flow regulating valve to perform elimination of a load, so that the damping coefficient is switched to a minimum value (Cmin).
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: June 26, 2007
    Assignee: Kajima Corporation
    Inventors: Yoshinori Matsunaga, Haruhiko Kurino
  • Patent number: 7143875
    Abstract: A hydraulic damper used for reducing shaking of a structure, for example in an earthquake. The hydraulic damper has a cylinder, a piston movable in a reciprocating manner within the cylinder, hydraulic chambers at opposite sides of the piston, and a single on-off control valve. There is a passage for connecting both of the hydraulic chambers and is on-off controlled to change a damping coefficient. A damping coefficient switching-type hydraulic damper is provided between a piston rod and the on-off control valve. A first damping coefficient is attained when the on-off control valve is maintained in a closed state for movement of said piston in one direction, and a second damping coefficient is attained when the on-off control valve is opened. A mechanical drive for the control valve may be a straight gear operatively attached to the piston rod of the cylinder, and a crank mechanism that works with the straight gear to on-off control the control valve.
    Type: Grant
    Filed: February 5, 2003
    Date of Patent: December 5, 2006
    Assignee: Kajima Corporation
    Inventors: Yoshinori Matsunaga, Haruhiko Kurino
  • Patent number: 7070027
    Abstract: A magneto-rheological (MR) damper including a piston guided in a cylinder that is filled with a magneto-rheological fluid, its work volume being formed oblique relative to the piston axis between the piston and the cylinder.
    Type: Grant
    Filed: August 21, 2002
    Date of Patent: July 4, 2006
    Assignee: Bosch Rexroth AG
    Inventors: Peter Manecke, Bernd Winkler, Bernhard Manhartsgruber
  • Patent number: 6971493
    Abstract: This invention provides a front fork that can be efficiently be filled with oil when it is manufactured.
    Type: Grant
    Filed: March 8, 2004
    Date of Patent: December 6, 2005
    Assignee: Kayaba Industry Co., Ltd.
    Inventor: Tsutomu Yoshimoto
  • Patent number: 6971492
    Abstract: A shock adapter for converting a one-way shock absorber into a two-way shock absorber comprising a housing having a first slideable member located on one end and a second slideable member located on the opposite end with the housing having a chamber therein for receiving and supporting a one-way shock absorber in a condition that allows movement of the housing of the one-way shock absorber in one direction when subject to a first force and the movement of the slideable member of the one-way shock absorber when subject to a second force in a direction opposite to the first force.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: December 6, 2005
    Inventor: Joseph M. Steckling
  • Patent number: 6926500
    Abstract: A drag damper for use on a rotary-wing aircraft rotor comprises a body defining two variable volume chambers linked by a piston. The chambers filled with fluid in the damper are connected by a restrictor port in the piston or between the latter and the body, and via a channel of great length and small cross-section compared with the cross-section of the body, in which elastic means bear against and load the piston-rod assembly towards a neutral position, the anti-resonance frequency of the damper being matched substantially to the nominal rotation frequency of the rotor, and the restrictor port providing effective damping at the natural frequency (??) of the blades in drag, differing by construction from the rotor frequency (?).
    Type: Grant
    Filed: July 1, 2002
    Date of Patent: August 9, 2005
    Assignee: Eurocopter
    Inventor: David Ferullo
  • Patent number: 6824154
    Abstract: A telescoping fork for the front wheel of a two wheel vehicle comprises a pair of outer tubes that each have a bottom end and a top end. An upper structural member and a lower structural member connect the outer tubes. Further, each outer tube tapers outwardly, both externally and internally, in a direction from the bottom end toward the lower structural member and from the top end toward the lower structural member. The structural members may attach to a top and bottom of a steering column.
    Type: Grant
    Filed: July 24, 2003
    Date of Patent: November 30, 2004
    Assignee: Maverick American LLC
    Inventor: Paul H. Turner
  • Patent number: 6789652
    Abstract: A resilient leg as part of an attachment for the wheel of a motor vehicle. The leg is provided with a piston rod (4) that has a piston (5) attached to it, that travels into and out of a housing (1), that is attached at its outer end to the vehicle's chassis, and that is maintained in radial alignment by two separated bearings. The piston divides the interior of the housing into two fluid-charged chambers (9 & 10). The object is to ensure satisfactory transmission of moments of force from the piston rod to the housing in a leg that is light in weight. The piston rod accordingly extends through, and is maintained in radial alignment at, both ends of the leg.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: September 14, 2004
    Assignee: ThyssenKrupp Bilstein GmbH
    Inventors: Michael Hönig, Walter Wirtz, Marcello Di Fina, Klaus Hofmann, Günter Poetsch
  • Patent number: 6736245
    Abstract: A dampening cylinder is provided. The dampening cylinder includes a cylindrical housing defining a cavity for receiving a fluid therein. A piston slidably extends through the cavity in the housing and includes a flange projecting radially therefrom. The flange is positioned within the cavity so as to divide the cavity in the housing into first and second portions. First and second flow control valves control the rate of flow of fluid between the first and second portions of the cavity in the housing, and hence, the rate at which the piston slides through the housing. An emergency stop valve is positioned in fluid communication with the fluid flowing between the first and second portions of the cavity in the housing. The stop valve is movable between a first open position for allowing the flow of fluid between the first and second portions of the cavity in the housing and a closed position for preventing the flow of fluid between the first and second portions of the cavity in the housing.
    Type: Grant
    Filed: February 10, 2003
    Date of Patent: May 18, 2004
    Assignee: Topper Industrial, Inc.
    Inventor: Edmund W. Brown
  • Publication number: 20030146060
    Abstract: A resilient leg as part of an attachment for the wheel of a motor vehicle. The leg is provided with a piston rod (4) that has a piston (5) attached to it, that travels into and out of a housing (1), that is attached at its outer end to the vehicle's chassis, and that is maintained in radial alignment by two separated bearings. The piston divides the interior of the housing into two fluid-charged chambers (9 & 10). The object is to ensure satisfactory transmission of moments of force from the piston rod to the housing in a leg that is light in weight. The piston rod accordingly extends through, and is maintained in radial alignment at, both ends of the leg.
    Type: Application
    Filed: February 3, 2003
    Publication date: August 7, 2003
    Inventors: Michael Honig, Walter Wirtz, Marcello Di Fina, Klaus Hofmann, Gunter Poetsch
  • Patent number: 6454206
    Abstract: A damping apparatus for damping vibrations in a vibrating system including a piston which is reciprocally movable in a fluid filled chamber, piston movement in either direction of movement being resisted by fluid pressure in the chamber behind the piston, which resistance provides damping forces which act to oppose piston movement, the piston being connected to one component of the vibrating system and the chamber being connected to a second component of the vibrating system, characterised in that structure is provided to relieve the fluid pressure behind the piston to allow substantially unopposed piston movement in the chamber without damping forces being provided, during piston movements which occur in response to vibrations in the vibrating system at frequencies other than a fundamental frequency which the damping apparatus primarily is intended to damp.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: September 24, 2002
    Assignee: GKN Westland Helicopters Limited
    Inventor: Alan Henry Vincent
  • Patent number: 6386311
    Abstract: A device and method for transferring steering responsibility from a first electro-mechanical actuator to a second electro-mechanical actuator comprises a cylinder and a first piston slideably disposed within the cylinder. A second piston is slideably disposed within an interior chamber of the first piston. A first locking sleeve is disposed within the interior chamber, a second locking sleeve is disposed within the interior chamber in opposition to the first locking sleeve, a first spring is disposed within the interior chamber interposed between the first locking sleeve and the first piston, and a second spring is disposed within the interior chamber interposed between the second locking sleeve and the first piston. The pistons and the locking sleeves also each include at least one groove disposed therein. Snap rings may be disposed within the grooves. A damping mechanism may also be incorporated into the structure of the device.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: May 14, 2002
    Assignee: Delphi Technologies, Inc.
    Inventor: Thomas W. Weisgerber
  • Patent number: 6371263
    Abstract: A vehicle and vehicle suspension including a number of shock chambers to provide different levels of incrementally increasing shock absorption/cushioning. The suspension includes a shock tube having a first end and a second end; a first member telescopically receiving the first end of the shock tube; a first piston coupled to the first member and sealingly received in the first end of the shock tube; a second member telescopically receiving the second end of the shock tube; and a second piston coupled to the second member and sealingly received in the second end of the shock tube. The first and second pistons form at least one shock tube sealed chamber in the shock tube, and the first member and second member are distanced from one another by the shock tube.
    Type: Grant
    Filed: October 20, 1999
    Date of Patent: April 16, 2002
    Inventor: Howard Hoose