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| Number | Title | Issue Date |
| 7357229 | Electromagnetic shock absorber An electromagnetic shock absorber according to the present invention has a shock absorber body 1 which makes telescopic motion in response to an input from outside. The shock absorber body 1 comprises a ball screw mechanism 15, which converts th... | 04/15/2008 |
| 6698558 | Safety brake system for garage doors A brake system for garage doors including a piston assembly movable within a longitudinal housing assembly and including a central through opening and a threaded bushing rigidly mounted to the piston assembly. A threaded axle is cooperatively received by ... | 03/02/2004 |
| 5611413 | Controllable valve arrangement for controllable two-tube vibration absorbers A controllable valve arrangement for controlling two-tube vibration absorbers comprises a power cylinder with an interior space subdivided into a first and a second power chambers by virtue of a slidable piston, and with a balancing chamber partly filled ... | 03/18/1997 |
| 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 |
| 5487455 | Variable flow valve with position sensor A directly actuated vibration absorber valve for controllable vibration absorbers. The valve includes a valve body that is actuatable by an electromechanical transducer. In the range of low volumetric flow rates an output signal is conveyed to an electric... | 01/30/1996 |
| 5480011 | Hydraulic damper A hydraulic damper has a first oil chamber, a second oil chamber, a communication mechanism defining a communication oil passage, the first and second oil chambers communicating with each other through the communication oil passage, and a damping force ad... | 01/02/1996 |
| 5472070 | Controllable hydraulic vibration absorber A controllable hydraulic vibration absorber is disclosed whose power cylinder and a tube defines a connecting duct which affords a balance of volume between both power chambers of the vibration absorber and a balancing chamber which is formed between the ... | 12/05/1995 |
| 5413196 | Oscillation damper According to an illustrative example of the present invention an oscillation damper is provided with a bypass interconnecting two fluid chambers. A main valve is provided within this bypass for allowing variation of the damping behavior of the oscillation... | 05/09/1995 |
| 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 |
| 5375683 | Controllable vibration damper for motor vehicles A variable dashpot for motor vehicles. It comprises a vibration-suppressing piston-and-cylinder mechanism. The cylinder contains displacement fluid. The piston divides the cylinder into two displacement compartments. The piston has a piston rod attached t... | 12/27/1994 |
| 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 |
| 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 |
| 5143185 | Controllable hydraulic vibration damper for automotive vehicles A controllable hydraulic vibration damper for automotive vehicles comprising a working cylinder which contains damping fluid and which is subdivided into two working chambers by a damping piston with a piston rod, the damper comprising at least one channe... | 09/01/1992 |
| 5137125 | Pressure-actuated valve A pressure-actuated valve which includes an effective pressure face by which the valve is opened, the face on which the pressure difference that opens the valve acts is completely independent of an openable flow opening. The effective pressure face and th... | 08/11/1992 |
| 5123671 | Method and apparatus for controlling shock absorbers An apparatus for damping the movement of the body of an automobile. The apparatus includes a shock absorber having a pressure cylinder which forms a working chamber and a first and second portion. A first sensor is used to generate an electrical signal in... | 06/23/1992 |
| 5113980 | Quick response adjustable shock absorber and system A monoflow shock absorber is provided with a blow off valve which provides the principal flow restriction during both extension and compression of the shock absorber. The force biasing the blow off valve closed is controlled by a control piston which is c... | 05/19/1992 |
| 5107969 | Controllable vibration damper A controllable vibration damper for automotive vehicles is disclosed having a damping piston which is axially slidably and sealedly guided in a damping tube, and which subdivides the damping tube filled with a damping medium into two working chambers. The... | 04/28/1992 |
| 5085299 | Shock absorber with two seat valve A shock absorber which in an event of an electrical defect provides a predetermined throttle cross section which provides a pressure drop in the throttle cross section that determines damping of fluid flow from one work chamber to another work chamber. Th... | 02/04/1992 |
| 5070284 | Fail-safe variable damping suspension for a motor vehicle A fail-safe variable damping suspension system for a motor vehicle controls the oscillatory spring movements of each wheel via a permanent magnet rotary electric machine which is connected to machine control circuitry by normally open contacts of a relay.... | 12/03/1991 |
| 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 |
| 5024302 | Apparatus for damping courses of motion An apparatus for damping movement courses of two bodies, in particular in a vehicle wheel/vehicle suspension system, having a piston sliding in a cylinder and dividing it into two work chambers, the two work chambers arranged to communicate with one anoth... | 06/18/1991 |
| 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 |
| 4846317 | Strut with controlled variable damping rate An apparatus for damping relative movement of parts. The apparatus includes a cylinder defining a fluid chamber. A piston is located in the fluid chamber and divides the fluid chamber into first and second fluid chamber portions. The piston is connected t... | 07/11/1989 |
| 4826205 | Anti-squat control system for automotive suspension system An anti-squat suspension control system includes an anti-squat control disabling means for disabling anti-squat control for a period while an engine idling condition detector switch is held closed or a given period after the engine idling condition detect... | 05/02/1989 |
| 4819772 | Motion-damping apparatus for a vehicle A motion-damping apparatus is proposed which has a shock absorber disposed between a vehicle axle and a vehicle body. A piston that is supported on the vehicle body via a piston rod is movably supported in an inner jacket tube of the shock absorber. The p... | 04/11/1989 |
| 4743000 | Method and apparatus for controlling spring stiffness, in particular in vehicles A method and an apparatus for controlling the spring stiffness in two bodies or masses that are movable relative to one another and in their absolute positions with variable speeds, in particular in resilient wheel suspension systems for vehicles and the ... | 05/10/1988 |
| 4723640 | Adjustable hydraulic vibration damper Hydraulic adjustable vibration damper with a damping piston, which divides the work cylinder into two chamber halves, whereby the two chamber halves are connected with one another by a bypass, in which an electromagnet controls the bypass. The bypass valv... | 02/09/1988 |
| 4706787 | Vibration damper with variable damping force A vibration damper for vehicles is disclosed with a variable damping force. The vibration damper includes two series-connected damping valve systems which effect a damping force variation by means of a blockable bypass passage. An externally influenceable... | 11/17/1987 |
| 4690464 | Hydraulic braking pressure control apparatus Hydraulic braking pressure device which includes a casing divided into a first cylinder portion and a second cylinder portion by a partition. A first piston is slidably fitted in the first cylinder portion and defines an input chamber between one end face... | 09/01/1987 |
| 4677263 | Air spring position switch A position switch is set forth which is adapted to generate a signal whenever two masses, such as a vehicle sprung and unsprung mass, are at or nearer than a desired spacing. The switch includes a grounded, conical, coiled spring attached to one mass, and... | 06/30/1987 |
| 4671392 | Vibration damper with variable damping force A vibration damper for vehicles is disclosed with a variable damping force. The vibration damper includes two series-connected damping valve systems which effect a damping force variation by means of a blockable bypass passage. An externally influenceable... | 06/09/1987 |
| 4666180 | Control system for hydraulic dampers A control system for controlling the damping force of a plurality of hydraulic dampers, each of which includes a damping force producing mechanism; a damping force adjustment member for adjusting the effective passage area of an oil passage in the damping... | 05/19/1987 |
| 4660686 | Adjustable shock absorber, especially for motor vehicles An adjustable shock absorber for motor vehicles has a cylinder containing damping fluid, a piston rod arranged to be axially displaceable in the cylinder, and a damping piston secured to the inner end of the piston rod. The damping piston divides the cyli... | 04/28/1987 |
| 4650042 | Hydraulic adjustable shock absorber A vibration damping system for vehicles, with a damping element in a cylinder. The cylinder holds a damping medium and is divided into two chambers by a piston. A damping valve, located in a bypass, is connected parallel to the work cylinder. The damping ... | 03/17/1987 |
| 4635960 | Control system for hydraulic dampers A control system for controlling the damping force of a plurality of hydraulic dampers, each of which includes a damping force producing mechanism; a damping force adjustment members for adjusting the effective passage area of an oil passage in the dampin... | 01/13/1987 |
| 4598929 | Vehicle suspension system When an automobile or other vehicle travels over a bump with a suspension in its switchable suspension system kept in a "soft" state, the car body pitches violently. This pitching is reduced by turning the suspension into a "hard" state by increasing the ... | 07/08/1986 |
| 4596320 | Hydraulic damper A hydraulic damper includes a cylinder containing hydraulic fluid therein, a piston working in the cylinder and partitioning the interior thereof into two liquid chambers, a piston rod connected to the piston and extending through one of the liquid chambe... | 06/24/1986 |
| 4526401 | Electronic control system for adjustable shock absorbers An improved control system for electrically adjustable shock absorbers features a fault detector, a system-stop unit, and optional indicators and voltage-supply stabilization systems. The fault detector times the interval between an adjustment command fro... | 07/02/1985 |
| 4153237 | Hydrapneumatic suspension unit and valving structure A hydrapneumatic suspension unit for a vehicle has a first and and a second chamber separated by valve assembly in communication with both chambers for controlling the flow of liquid therebetween. The first said chamber is liquid filled and includes a sli... | 05/08/1979 |
