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| Number | Title | Issue Date |
| 7611000 | Damping force adjusting structure of hydraulic shock absorber In a damping force adjusting structure of a hydraulic shock absorber in which a part of an oil liquid is introduced to a back pressure chamber provided in a back surface side of a damping valve from a back pressure introduction path, a pressure within the back press... | 11/03/2009 |
| 7322449 | Hydraulic shock absorber A piston connected to a piston rod is fitted into a cylinder in which a hydraulic fluid is sealably contained. A flow of the hydraulic fluid is generated in an extension-side fluid passage and a compression-side fluid passage according to a sliding motion of the pis... | 01/29/2008 |
| RE39961 | Computer controlled hydraulic resistance device for a prosthesis and other apparatus A computer controlled hydraulic resistance device for apparatus such as a prosthetic knee for above knee amputees, includes a two stage pilot operated solenoid valve connected to control the flow of hydraulic fluid to and from a hydraulic actuator which applies resi... | 12/25/2007 |
| 7273138 | Damping force variable valve and shock absorber using same A damping force variable valve includes a main valve provided between a high pressure section and a low pressure section, for allowing a flow of oil from the high pressure section into the low pressure section when the main valve is opened, the main valve being capa... | 09/25/2007 |
| 7128192 | Inertia valve shock absorber A damper including a valve movable between an open position and a closed position to selectively alter the compression damping rate of the shock absorber. The valve may include a self-centering feature that operates to keep the valve body centered about the valve sh... | 10/31/2006 |
| 7066307 | Hydraulic dashpot for motor vehicles A hydraulic dashpot for motor vehicles, with a cylinder and a primary piston. The cylinder (1) is charged with shock-absorption fluid. The primary piston (2) is mounted on the lower end of a piston rod (8) and partitions the cylinder into two ch... | 06/27/2006 |
| 7021435 | Monotube strut with rebound cut-off feature A suspension damper including a tube and a damping piston assembly disposed within the tube and slidably mounted therein for reciprocal movement in the tube. The suspension damper also includes a piston rod extending through the tube and connected to the damping pis... | 04/04/2006 |
| 6974004 | Shock-absorbing piston for hydraulic fixtures A shock-absorbing piston for hydraulic fixtures, especially hydraulic dashpots for motor vehicles, and separating two hydraulics chambers. The body of the piston is breached by one or more ports. The end of each is blocked by a resilient or resiliently loaded cap. T... | 12/13/2005 |
| 6918473 | Stroke dependent bypass A shock absorber has a pressure tube with a piston assembly slidably disposed within the pressure tube and attached to a piston rod. The piston assembly divides the pressure tube into an upper working chamber and a lower working chamber. The piston assembly includes... | 07/19/2005 |
| 6837344 | Piston and rod assembly for air-actuated variable damping A damper includes a piston that carries a relatively compact control valve for controlling fluid flow through the piston. The control valve provides a variable amount of damping by regulating damper fluid flow between the extension chamber and the compression chambe... | 01/04/2005 |
| 6390254 | Constant volume damper A constant volume damper which has a very constant damping constant over a considerable range of frequencies by including check valves that prevent cavitation as a piston moves in a chamber. The damper is also sealed for use in space application and is te... | 05/21/2002 |
| 6273224 | Shock absorber mounted electromagnetically operated damper valve A shock absorber mounted electromagnetically operated damper valve which is mounted upon a piston rod and provides a flow path for fluid which bypasses the piston which separates a cylinder of the shock absorber into a pair of fluid containing chambers. T... | 08/14/2001 |
| 6161662 | Suspension damper for motor vehicle A monotube suspension damper including a cylinder tube having a fluid chamber and a gas chamber, a piston dividing the fluid chamber into a compression chamber and a rebound chamber, a primary fluid flow path across the piston including flow control valve... | 12/19/2000 |
| 6113642 | Computer controlled hydraulic resistance device for a prosthesis and other apparatus A computer controlled hydraulic resistance device for apparatus such as a prosthetic knee for above knee amputees, includes a two stage pilot operated solenoid valve connected to control the flow of hydraulic fluid to and from a hydraulic actuator which a... | 09/05/2000 |
| 6003849 | Hybrid isolator and structural control actuator strut A vibration damping and isolation apparatus including a passive damping mechanism and an active enhancement mechanism. The passive damping mechanism operates to dissipate vibratory and shock forces applied to the vibration damping and isolation apparatus.... | 12/21/1999 |
| 5624010 | Regulable shock-absorption valve system for the dashpot in a motor vehicle The invention concerns a regulable shock-absorption valve system for the dashpot in a motor vehicle. It has two shock-absorption valves. Each valve consists of an electromagnetic bolt that slides back and forth and operates in conjunction with at least on... | 04/29/1997 |
| 5560454 | Piston with bi directional passive disk valve and extension-openable regulating valve The incorporation of a unidirectional flow regulation valve into the piston of a damper provides continuously variable real time damping with passive compression damping. The valve is housed within the piston thus incorporating into a single component the... | 10/01/1996 |
| 5501307 | Shock absorber In the shock absorber wherein the operation of the main valve for opening and closing a main oil channel by the action of the energizing current flowing through a linear solenoid thereby to control the damping power, an improvement in the response propert... | 03/26/1996 |
| 5409089 | Shock absorber A known shock absorber including a throttle cross section of a throttle passage which is electrically variable via a magnet, to adjust damping of fluid between separate work chambers. If the magnet has no current in the event of an electrical defect, then... | 04/25/1995 |
| 5409088 | Shock absorber An electrically controlled shock absorber comprised of a piston element having a cavity in which a pair of sub-assemblies are contained. One sub-assembly comprises a pilot valve and its actuator and the other sub-assembly comprises a poppet valve. The two... | 04/25/1995 |
| 5400877 | Two-tube shock absorber A two-tube shock absorber for automotive vehicles is furnished with a shock absorber piston and an electromagnetically actuatable unidirectional shock absorber valve to adjust a "smooth" characteristic which is desired for enhancing driving comfort. The s... | 03/28/1995 |
| 5392883 | Controllable hydraulic vibration dampener A regulable hydraulic dashpot for motor vehicles. It features a shock-absorbing piston (1) and a shock-absorbing cylinder (2). The piston travels into and out of the cylinder on a rod (21). The piston divides the cylinder into two hydraulics compartments ... | 02/28/1995 |
| 5372224 | Oscillation damper An oscillation damper is provided with a by-pass that includes a by-pass valve. The by-pass valve is switchable between an open position and a closed position. When the by-pass valve is moved between the open and closed positions, the rate of change of th... | 12/13/1994 |
| 5310027 | Control system for adjusting damping force coefficient of shock absorber for automotive suspension A control system for a damping force coefficient of a shock absorber for a vehicle suspension provides a controller for correcting the position of a step motor. The controller sets the step motor at a predetermined position in a manner to intermittently m... | 05/10/1994 |
| 5303804 | Shock absorber for damping courses of motion of a vehicle A shock absorber including an electromagnetically actuatable control piston located in a damper piston within a cylinder. The damping force is determined directly with the triggering of the magnet coil, regardless of the relative speed between the piston ... | 04/19/1994 |
| 5299488 | Active suspension system An actuator for use in an active suspension system is controlled by a valve responsive to differential pressure across the piston of the actuator. The valve operates to allow movement of the piston so as to reduce the pressure differential. The valve is a... | 04/05/1994 |
| 5293968 | Dual-tube shock absorber A dual-tube shock absorber having a damping piston, which is joined to a vehicle body via a piston rod; an inner cylinder, guiding the damping piston, that is disposed in an outer cylinder which is connected to the vehicle axle and that together with the ... | 03/15/1994 |
| 5244063 | Controllable or regulatable hydraulic shock absorber A controllable or regulatable hydraulic shock absorber has a damping-control valve designed as a force-proportional valve and has a closing force variable directly or indirectly via a proportional magnet. The damping resistance brought about by the dampin... | 09/14/1993 |
| 5184703 | Shock absorber with piston valve for adjustable damping A shock absorber includes a cylinder (1) with damping fluid, a piston rod (2) which is displaceable in the cylinder (1) and a piston (3) attached thereto which bounds a central aperture (8) extending in the axial direction of the cylinder (1) and closed a... | 02/09/1993 |
| 5174552 | Fluid mount with active vibration control A fluid mount with the capability of actively controlling the amount of vibrational energy transmitted thereacross. An actuator is provided in series or in parallel with the inertia track passageway of a double pumper isolation mount to permit the dynamic... | 12/29/1992 |
| 5094321 | Shock absorber with variable damping characteristic A shock absorber wherein the piston of the piston-piston rod assembly divides the internal space of the cylinder into first and second chambers. The piston has first and second passages for the flow of fluid between the chambers in response to shifting th... | 03/10/1992 |
| 5035306 | Adjustable damping force hydraulic shock absorber An adjustable damping force hydraulic shock absorber comprising a cylinder, a piston partitioning the interior of the cylinder into two chambers, a plurality of passages through which working fluid contained in the cylinder flows when the piston axially m... | 07/30/1991 |
| 5027928 | Suspension arrangement A suspension arrangement for use with aircraft landing gear, including an upper strut, a lower strut that is assembled with and telescopes relative to the upper strut and an oil reservoir within the struts. An adjustable valve assembly includes two intera... | 07/02/1991 |
| 5004079 | Semi-active damper valve means and method An improved method and means for control and accomplishment of semi-damper assembly transition between high damping and low damping states is provided which takes advantage of the available inherent dynamic fluid pressure forces produced by the condition ... | 04/02/1991 |
| 4986392 | Shock absorber with variable damping characteristic A shock absorber wherein a piston divides the internal space of a cylinder into two cylinder chambers and has a passage of variable cross-sectional area for the flow of damping fluid between the cylinder chambers. The piston has a first section which is c... | 01/22/1991 |
| 4973854 | Hydraulic shock-absorber and vibration damper with adjustable damping A hydraulic shock-absorber and vibration damper comprising a cylinder (1), a damping piston (2) disposed so as to be axially movable inside the cylinder (1) and dividing off two working chambers (9, 10) filled with a hydraulic damping medium and connected... | 11/27/1990 |
| 4958704 | Hydraulic telescopic shock absorber A hydraulic telescopic shock absorber wherein damping characteristic can be varied by means of an electromagnetic valve arrangement, the coil of which is accommodated so as to be protected against the hydraulic medium of the shock absorber. The control pr... | 09/25/1990 |
| 4953671 | Damping force adjustable hydraulic shock absorber A hydraulic shock absorber is used, for example, in a vehicle, wherein the level of damping force is adjustable in accordance with the road surface conditions or the like during operation of the vehicle. The hydraulic shock absorber includes a piston atta... | 09/04/1990 |
| 4946009 | Electromagnetic valve utilizing a permanent magnet A valve has a magnetic drive unit axially spaced from a valve section. An axially movable armature is moved by an electromagnet and an annular permanent magnet having radial magnetization. Reciprocation of the armature opens and closes a poppet valve to r... | 08/07/1990 |
| 4917222 | Shock absorber A shock absorber comprises a tubular working cylinder (12) to be mounted on a suspended part of a vehicle, with a piston rod assembly (26) received slidably in the working cylinder (12) having an end (28) to be mounted on a fixed part of the vehicle. The ... | 04/17/1990 |
