Abstract: The invention relates to a rapid recovery shock absorber system with hydraulic end stop, comprising a stem (3) and a body (1), in which a piston (8, 9, 10, 11) runs which is fixed to a tube (71) and which defines at least one upper chamber (S) and one lower chamber (I) in the body (1). A body (32, 32a) in the stem (3) comprises a housing (321), in which a piston (33, 33a) runs which is connected to a rod (7) which slides in the tube (71). A clamp (31), for fixing the shock absorber system to the vehicle, tensioning means (35, 37, 39), exerting a force which tends to displace the piston (33, 33a), sliding in the stem body (32, 32a), driving the displacement of the rod (7) which results in the opening or closing of a section of an oil passage in the lower chamber (I) towards the upper chamber (S) are also provided.

Abstract: A shock absorber comprises a first passage (2a, 2b) and a second passage (15) connecting a first fluid chamber (41) and a second fluid chamber (42). A throttle (12, 14) narrows an inflow of fluid to the first passage (2a, 2b) according to an applied displacement pressure. The displacement pressure includes a fluid pressure in one of the two fluid chambers (41, 42) and a pressure that depends on a velocity of the fluid flow through the throttle (12, 14). A spring (25, 29) biases the throttle (12, 14) in the opposite direction to narrow the fluid flow. The second passage (15) comprises a pair of orifices (16a, 17a). By exerting a pressure between the pair of orifices (16a, 17a) on the throttle (12, 14) in the opposite direction to narrow the fluid flow, the spring load required of the spring (25, 29) is reduced.

Abstract: A suspension damper includes a housing bounding a main chamber. A hydraulic fluid is disposed within the main chamber. A piston rod is selectively movable between an advanced position wherein a portion of the piston rod is advanced into the main chamber and a retracted position wherein the portion of the piston rod is retracted from the main chamber, wherein as the piston rod is moved a fluid pressure of the hydraulic fluid within the main chamber progressively increases and a portion of the hydraulic fluid passes through a passage within the housing. A control valve is at least partially disposed within the main chamber, the control valve being moved by the fluid pressure of the hydraulic fluid so as to progressively restrict the flow of the hydraulic fluid through the passage as the fluid pressure of the hydraulic fluid within the main chamber progressively increases.

Abstract: In one embodiment, an internal bypass shock absorber is disclosed whose compression and rebound resistance can be independently adjusted and is position dependent. The shock absorber features a fluid flow regulator coupled to a hollow chamber opening of a partially hollow piston rod. The fluid flow regulator may also feature a plurality of compression orifices and rebound orifices, and a compression valve stack and rebound valve stack each having one or more deflection discs. The number, diameter, and thickness of the deflection discs of the stacks can be adjusted to independently control compression and rebound resistance by controlling the flow of fluid between the first and second chambers of the cylinder housing of the shock absorber. The shock absorber may also have a tapered needle that controls the position at which the shock exhibits its maximum resistance.

Abstract: A suspension apparatus for providing a progressively dampened motion, said apparatus comprising a housing (14) defining a first chamber (12) having a first end (26) with said first chamber (12) containing a volume of liquid (52). The apparatus further comprises at least one plunger (6) defining a second chamber (8) with the plunger (6) being slidably movable within said housing (14) and containing a volume of gas (56). A fluid communication path (80) provides for fluid communication between the first and second chambers allowing the transferal of liquid (52) between the first and second chambers. Transfer of liquid (52) into the second chamber (8) compresses the gas (56) whereby the fluid communication path (80) becomes progressively constricted as the plunger (6) is motivated toward said first end (26) of said first chamber (12) by a load applied or transmitted to said plunger (6).

Abstract: The present invention relates to devices for damping the movement of a body Co between two positions at the end of travel. The device according to the invention is essentially characterized in that it comprises two abutments B1, B2, a cylinder 10, a wall 11 closing off the end 12 of the cylinder 10, a piston 14 delimiting a chamber 16 with variable volume, a cylinder 20 with an external section at most equal to the internal section of the cylinder 10, means for mounting the cylinder 20 in cooperation with the piston 14 so that the latter closes off the end 21 of this cylinder 20, a piston 24 delimiting a chamber 26 with variable volume, a first fluid Li filling the two chambers 16, 26, means 30 for communication under pressure loss between the chambers 16, 26, an abutment 40 mounted in cooperation with the piston 24 so that this abutment 40 has a movement correlative with that of the piston 24, and means 50 for connecting the cylinder 20 to the body Co.

Abstract: A vibration damper with stroke-dependent damping force includes a cylinder in which a piston rod with a piston is axially movable. The piston divides the cylinder into two work spaces filled with damping medium. A bypass between the work spaces is opened or closed depending on the piston position. The piston has a damping valve for at least one through-flow direction formed by a valve body that partially covers a through-flow channel in the damping valve. The valve body has first and second pressure-actuated surfaces on opposite sides of the valve body. The action of the second pressure-actuated surface depends on the position of the piston in relation to the bypass. The first pressure-actuated surface exerts a lifting force and the second pressure-actuated surface exerts a closing force on the valve disk. The second pressure-actuated surface is connected to a control space and a connection channel that overlaps with the bypass depending on the stroke position of the piston.

Abstract: A displacement element includes a first piston, a second piston, a cylindrical housing filled with a fluid under pressure, a piston rod, and a spring. Each of the pistons is adapted to the respective internal diameter of its section and divides the respective section into two pressure chambers. The first piston is arranged at one end of the piston rod, and both pistons each include means for damping the movement of the piston rod respectively in one direction. The second piston is arranged on the side of the first piston facing away from the piston rod and is capable of displacement by means of the first piston in a direction facing away from the open end. The spring is arranged on the side of the second piston facing away from the first piston, and supported by the second piston and the housing.

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 extends 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.

Abstract: A shock assembly includes a first tube having a cylindrical wall with an inner surface and an outer surface. A second tube is received within the first tube and includes a cylindrical wall having an inner surface and an outer surface. A piston assembly is received within the second tube and includes a piston rod and a piston that is selectively movable relative to the first tube and the second tube. A height-sensing device is disposed within the first tube between the inner surface of the first tube and the outer surface of the second tube.

Abstract: A vehicle shock absorber generates an additional counter-force acting counter to the direction of movement near the limit position of movement. The shock absorber substantially comprises a damping medium-filled damping cylinder that is divided into two damping chambers by a main piston. The main piston is axially moveable relative to the damping cylinder and is attached to a piston rod. A second piston/damping piston that contains one or more first and second through-ducts is mounted to the piston rod. The ducts are defined by first and second flow-limiting devices such as multiple thin washers. The damping piston slides in a restricting space located in the damping cylinder. The restricting space has an inside diameter smaller than the inside diameter of the damping cylinder. The additional counter-force is substantially constant throughout the entire stroke in order to create gentle braking of the damping movement.

Abstract: A vibration damper for vehicles comprises a work cylinder in which a piston is guided axially by a piston rod. The piston divides the work cylinder into two work spaces filled with damping fluid. A tension stop is provided between the piston and a piston rod guide, wherein a tension stop element including a flexible part and a reinforcing ring is arranged between a support fastened to the piston rod and the piston rod guide. The reinforcing ring limits the deformation of the flexible part of tension stop when subjected to force during operation so that permissible shearing stresses of the flexible part are not exceeded.

Abstract: A roll stabilizer for a vehicle includes a resilient member operatively connected between a movable end and a fixed end, and structure for activating and deactivating operation of the stabilizer by affecting compression of the resilient member.

Abstract: Rotary wing system with a rotating blade rotating about a rotation axis. The system includes a fluid damper with a damper fluid for controlling a troublesome motion. The fluid damper has an inboard end and an outboard end, the damper inboard end attached to a first rotary wing system inboard member proximate the rotation axis and the outboard end attached to a second rotary wing system outboard member distal from the rotation axis. The fluid damper contains a damper fluid volume in at least a first working chamber which is worked by a relative motion between said first rotary wing system inboard member and said second rotary wing system outboard member to control the troublesome motion.

Abstract: A bicycle suspension system is provided with a damping unit and a damping control unit to control movement of upper and lower telescopically connected tubes. A damping force adjustment valve selectively adjusts a fluid flow rate of fluid passed a damping piston. The damping piston has a fluid flow port that is axially spaced with respect to a fluid flow passage of a damping lockout mechanism such that a flow path is formed in an axial direction by the fluid flow port of the damping piston and the fluid flow passage of the damping lockout mechanism when the damping lockout mechanism is in a non-lockout mode. A first actuating member operates the damping force adjustment valve and a second actuating member operates the damping lockout mechanism such that the damping force adjustment valve remains in a set position when the second actuating member is being operated.

Abstract: The damper generally has a cylinder with a damping fluid, and a piston having a connecting rod slidably carrying a first damping piston head and an obstructing portion in the cylinder. Further, a second damping piston head is slidably mounted in the cylinder, independently from the piston, and biased to a neutral position. The second damping piston head has a damping flow path and a bypass flow path which is normally kept in an open state. When an abnormally strong shock occurs, the displacement of the first damping piston head exceeds its normal displacement span and the obstructing portion is placed into obstruction with the bypass flow path, thereby forcing the damping fluid through the damping flow path of the second damping piston head.

Abstract: A vibration damper with amplitude-selective damping force includes a cylinder containing a damping medium, a piston rod which is axially movable in the cylinder, and a piston assembly arranged for axial movement in the damping medium, the piston assembly being connected to the piston rod and dividing the cylinder into a working space around the piston rod and a working space opposite the piston rod, the piston assembly includes a piston body having connecting channels for opposite directions of flow between the working spaces, and valve disks which open the channels in respective opposite directions. A pilot assembly includes an axially movable shifting ring which controls a flow connection between the working spaces as a function of movement of the piston rod, and a pair of stop surfaces which limit axial movement of the shifting ring, wherein the stop surfaces are independent of the piston body and the valve disks.

Abstract: In a hydraulic shock absorber (1), a piston rod (5) protrudes from a cylinder (3) filled with hydraulic fluid. A rebound cushion (8) is fitted to an outer circumferential surface of the piston rod (5) in the cylinder (3). A stopper (6) fixed to the cylinder (3) contacts the rebound cushion (8) at an protrusion limiting position of the piston rod (5) to prevent further protrusion of the piston rod (5). An oil pool (8a, 9, 10, 15) formed in a sliding surface (8a, 14) of the rebound cushion (8) supplies oil to the sliding surface that slides on any of the inner circumferential surface of the cylinder (3) and the outer circumferential surface of the piston rod (5) to ensure smooth relative rotation of the piston rod (5) at the protrusion limiting position and the cylinder (3).

Abstract: A shock absorber, in which external gas is sucked by movement of a piston rod to obtain compressed gas, which is used for inhibiting the “lag” phenomenon. A piston valve is connected to one end of a piston rod received in an inner shell and moved between rebound and compression strokes, an inner space of the inner shell being divided into a rebound chamber and a compression chamber by the piston valve. A reservoir chamber is provided in an outer shell outside of the inner shell to supply oil to the compression chamber in the rebound stroke and to recover oil in the compression stroke. The shock absorber has a high pressure tank with a high pressure chamber installed outside of the outer shell, and a self pumping unit for sucking gas and pumping it into the high pressure chamber using energy generated by movement of the piston rod.

Abstract: The multifunctional portable pneumatic exercise device is a muscular exercise and training device that may be used for a multiplicity of exercises and with a wide variety of muscle groups. The exercise device includes a telescopic tube that is sealed at a distal end thereof and has a valve mounted on the proximal end thereof. In operation, the user compresses the telescopic tube and the increased air pressure within the telescopic tube causes fluid resistance, providing the user with muscular exercise. The user controls the fluid resistance through selective adjustment of the valve, which controls the volume of air escaping from the telescopic tube. Further, a pair of straps are releasably secured to either end of the telescopic tube, allowing the telescopic tube to be secured to a selected body part. The exercise device is portable, easy to operate and provides a wide range of muscular exercises for the user.

Abstract: A vertical acceleration compensator is employed in the braking system of a vehicle wheel that undergoes vertical motion relative to the vehicle frame. The vertical acceleration compensator senses the vertical movement of the vehicle wheel relative to the vehicle frame and includes first and second component elements that form a variable volume compensation chamber. The vertical acceleration compensator is coupled in fluid communication with a brake fluid reservoir and a fluid actuated brake mechanism. The first and second compensator elements may be coupled to the vehicle wheel and to the vehicle frame. As a result, upward movement of the vehicle wheel relative to the vehicle frame reduces the volume of the compensation chamber, while downward movement of the vehicle wheel relative to the vehicle frame increases volume of the compensation chamber. A reduction in volume of the compensation chamber increases brake line pressure, thereby increasing the braking force on the wheel.

Abstract: An air damper includes a cylinder having a bottom, a piston received inside the cylinder to move freely back and forth coaxially, and an orifice provided in the piston. The piston is formed of a synthetic resin, and has a piston rod extending toward a side of the cylinder opposite to the bottom, and a recess portion provided on a portion facing the bottom in order to prevent sink or the like during molding of the piston. A protruding portion is provided on the bottom of the cylinder to protrude into the recess portion when the piston is fully moved into the cylinder.

Abstract: A gas-filled spring (1) operates using gas (13, 14) and may be intended for a motor cycle. The gas-filled spring comprises a cylinder (2) and a piston (4), said cylinder comprising a compression chamber and a return chamber (8, 9). An arrangement maintains the necessary quantities of gas and gas pressure settings or differential pressures in the chambers despite any gas leakage and temperature variations occurring. Arranged between the chambers is a passage (12), which is open only in a predetermined position of the cylinder and the piston relative to one another. In the open position gas transfer between the chambers and/or pressure equalization in or differential pressure adjustment of the gas pressures in the chambers are permitted. The invention also relates to a valve for counteracting rapid changes in leakage and temperature. The desired spring characteristic of the gas-filled spring can in this way be maintained despite leakage and temperature variations.

Abstract: A hydraulic shock absorber has an outer body with a central bore. A first piston is telescopingly received in the central bore adjacent a closed end thereof, and has a generally annular shape with an inner surface defining a central piston bore, and an outer surface disposed adjacent the sidewall of the central body bore to define a first annularly-shaped metering aperture. A second piston is telescopingly received in the central bore of the first piston, and has an outer surface disposed adjacent to the inner surface of the first piston to define a second annularly-shaped metering aperture therebetween. Hydraulic fluid is disposed in the central body bore between the closed end thereof and the pistons, such that inwardly directed impact forces on the pistons displace the hydraulic fluid through the metering apertures to progressively dampen the impact forces.

Abstract: In a cylinder apparatus such as a hydraulic shock absorber, a piston to which a piston rod is connected slidably is inserted into a cylinder which contains liquid oil. A rebound spring is wound around the piston rod with one end of the piston rod fixed to the piston rod using a spring holder. The rebound spring is slidably guided along the piston rod by means of another spring holder. A rebound stopper is fixed to the piston rod at a position between the spring holders. The rebound spring exerts a spring force opposite to the extension of the piston rod, thereby to moderate shock at the end of the stroke of the piston. Because the spring holder comes into contact with the rebound stopper, contact of adjacent linear portions of the rebound spring with each other due to excessive compression of the rebound spring can be prevented, and also occurrence of strange noise and damage of the rebound spring can be prevented.

Abstract: A damper includes: a cylinder: a piston rod inserted to be movable linearly in the cylinder; a guide member provided with a coupling hole to which an insertion portion of the rod member is coupled at a center thereof, and provided with first and second grooves at an outer circumferential surface thereof; a fixed damping member fitted into the first groove and adhered to an inner surface of the cylinder; and a movable damping member up and down movably fitted into the second groove and selectively adhered to the inner surface of the cylinder.

Abstract: A shock absorber includes a hydraulic stop. The hydraulic stop includes two housings connected together by a spring. At the end of the stroke of the shock absorber, the piston causes the two housings to approach each other thereby causing fluid disposed between the housings to flow through a bleed passage. The size or total area of the bleed passage will determine the amount of hydraulic damping provided by the hydraulic stop.

Abstract: A shock absorber includes a hydraulic stop. The hydraulic stop includes two housings connected together by a spring. At the end of the stroke of the shock absorber, the piston causes the two housings to approach each other thereby causing fluid disposed between the housings to flow through a bleed passage. The size or total area of the bleed passage will determine the amount of hydraulic damping provided by the hydraulic stop.

Abstract: 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 piston assembly, a rod guide assembly closing a bottom end of the tube, and a rebound cut-off disk and spring suspended in the tube between the rod guide assembly and the damping piston assembly and cooperating with the damping piston assembly to provide a rebound cut-off effect between the rebound cut-off disk and the damping piston assembly. The rebound cut-off disk and spring have specific gravities that are greater than the specific gravity of the fluid in the tube, such that the disk and the spring sink in the fluid.

Abstract: A powerful high frequency shock absorber/accelerator uses compressed air but maintains a substantially uniform level of force throughout retraction and extension strokes. A piston moving in an inner chamber compresses gas in the chamber. Initially, an aperture allows compressed gas to be pushed to an outer storage chamber surrounding the inner chamber. As the piston moves further, sealing structure seals gas coming through the aperture thereby isolating the compressed air in the outer chamber from the inner chamber. At the end of the retraction stroke the small amount of remaining air is vented to outside and the piston faces a small counterforce-generating member. When the extension stroke is initiated the counterforce-generating member moves the piston a small distance until the seal is broken. The force of the compressed air rushing back into the inner chamber drives the extension stroke. Additional embodiments include replacing outer chamber with external source of gas.

Abstract: An extension spring strut comprises a pre-loaded extension spring with a damper disposed therein. An operating element is disposed inside the extension spring, having an actuating tappet that is joined to an end of the extension spring. The actuating tappet is displaceable over a total range of travel that includes a damping range of the piston rod of the damper and a no-load range of the actuating tappet.

Abstract: A damping force-variable shock absorber comprises a cylinder and a piston rod inside the cylinder. The piston rod is linearly moveable relative to the cylinder. An orifice valve plate having a plurality of valve holes is configured and mounted so as to form a circle about the piston rod. A rotary valve plate having a plurality of radially-protruding projections is mounted about the piston rod and is rotatable with respect to the piston rod and the orifice valve plate. The rotary valve plate has a first and at least a second rotating state with respect to the orifice valve plate, wherein the plurality of valve holes respectively define a first opening and at least a second opening. A guide means for rotating the rotary valve plate between the first and the at least second rotating states is located between the rotary valve plate and the cylinder.

Abstract: A cylinder and piston assembly having damping orifices disposed on a wall of the cylinder is used for impact energy and force reduction. The damping orifices may be of any shape and, therefore, a cylinder and piston may produce variable damping forces and variable resistive forces. A damping orifice may be positioned at any point or location along the length of the cylinder bore. The damping coefficient of the system begins to change at the location of a damping orifice in the cylinder bore. A desired system response, e.g., progressive, regressive, varying, or any combination thereof, etc., may be advantageously obtained by designing the damping orifices to produce falling-rate and/or rising-rate damping coefficients.

Abstract: The hydraulic cylinder or shock absorber arrangement has a cylinder unit limiting an inner space in which a medium in the form of a gas or a liquid is intended to be placed. A forwardly and backwardly movable piston unit is placed such that it can slide within the space that is defined by the piston into a first chamber and a second chamber. An inlet/outlet is defined in the respective chambers of the cylinder unit for the addition to and removal of medium from the chambers together with devices that co-acts in order to determine the relative position of the piston within the cylinder unit.

Abstract: A two-stage piston has a twin piston design where one piston produces a high damping force and the second piston produces a low damping force. At specified positions along the pressure tube, by-pass passages are formed to allow fluid flow around the high damping force piston to provide a low damping force or a soft ride. In the areas of the pressure tube where there are no by-pass passages, the high damping force piston provides a high damping force or a firm ride. In the area of the pressure tube where there are no by-pass passages, the high damping force piston and the low damping force piston both contribute to the high damping force.

Abstract: 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 piston assembly, a rod guide assembly closing a bottom end of the tube, and a rebound cut-off disk and spring suspended in the tube between the rod guide assembly and the damping piston assembly and cooperating with the damping piston assembly to provide a rebound cut-off effect between the rebound cut-off disk and the damping piston assembly. The rebound cut-off disk and spring have specific gravities that are greater than the specific gravity of the fluid in the tube, such that the disk and the spring sink in the fluid.

Abstract: The production of sharp shocks is prevented by increasing resilient gas characteristics in response to the compression stroke acting on a front fork. The front fork comprises a tube 1 connected to the vehicle body and a tube 2 connected to the vehicle wheels and engaging to slide freely with respect to the tube 1. A damper 3 and a suspension spring 7 which is biased in a direction in which the tubes 1, 2 are extended are provided in an interior space between the vehicle-body tube 1 and the vehicle-wheels tube 2. A first gas chamber 4 and an oil chamber 5 into which oil is introduced from the damper 3 are formed in the interior space. A second gas chamber 9 is provided which is connected to the first gas chamber 4 through a orifice 10. A space A which is provided between the outer periphery of the suspension spring 7 and the inner periphery of the vehicle-body tube 1 and is closed by entry of the tip 2a of the vehicle-wheel tube 2.

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.

Abstract: A system that includes a magnetically actuated motion control device comprising a housing defining a cavity and including a slot therethrough. A movable member is located within the cavity and is movable relative to the housing. A magnetic field generator located on either the housing or the movable member causes the housing to press against the movable member to develop a friction force.

Abstract: 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 piston assembly, a rod guide assembly closing a top end of the tube, and a rebound cut-off disk and spring suspended in the tube between the rod guide assembly and the damping piston assembly and cooperating with the damping piston assembly to provide a rebound cut-off effect between the rebound cut-off disk and the damping piston assembly. The rebound cut-off disk and spring have specific gravities that are less than the specific gravity of the fluid in the tube, such that the disk and the spring are floatable in the fluid.

Abstract: A device for increasing shock absorption by hydraulic means in the terminal section (19 & 27) of hydraulic shock absorbers with a shock-absorption piston (3) that divides the shock absorber into two compartments. The width of a channel that conveys hydraulic fluid through the piston is reduced by partly blocking the access of fluid thereto. The access comprises several individual accesses that do not mutually communicate. To ensure precise and constant increased shock absorption in the vicinity of the buffers, one or more individual accesses are completely blocked.

Abstract: The present invention relates to a damping apparatus for moving furniture parts, for example doors, flaps or drawers. Such a damping apparatus of a compact construction which avoids a possible springing back movement of the furniture parts is provided in accordance with the invention in that the damping apparatus has at least two damping stages each having a cylinder having a piston longitudinally displaceable therein which exert a damping action of different strengths.

Abstract: In a hydraulic shock-absorber comprising a cylinder, a piston rod provided with a rebound stopper secured thereto, and a rod guide provided at an end of said cylinder which rod guide butts against the rebound stopper at an extension stroke end of the piston rod, the rod guide is formed of a plate and comprises, at the location of butting against the rebound stopper, a butting planar portion extending radially of the cylinder from a lower end of the inner cylindrical portion against which butting planar portion the rebound stopper butts, and a butting slant portion extending downward obliquely toward the cylinder from an outer end of the butting planar portion against which butting slant portion an radially outer portion of the rebound stopper butts, thereby enabling the rod guide to be prevented from being deformed and also allowing the piston rod to always slide smoothly.

Abstract: Hydraulic tension stop for vibration dampers, shock absorbers, or similar piston-cylinder assemblies, where each assembly has a fluid-filled working space, the boundaries of which are formed axially by a piston rod guide and the piston and radially by the cylinder and the piston rod which carries the piston, part of this working space also belonging to the tension stop. A stop ring is mounted on the piston rod, which ring cooperates with a slotted, outwardly tensioned damping ring, so that the tension damping can be varied as a function of the stroke. When the stop ring reaches a predetermined position, the damping ring seats in a rest-position channel in a slide face permanently attached to the cylinder, the channel having a conical surface.

Abstract: A vibration damper includes a rebound, in particular a rebound spring. The vibration damper includes a piston which is formed on an axially movable piston rod and which separates two working chambers in a cylinder, the working chamber penetrated by the piston rod being closed off with a lid and containing the rebound. An out-stroke of the piston rod relative to the cylinder includes an idle-stroke which starts at a minimum out-stroke and in which the rebound does not counteract the piston rod movement, a working-stroke which ends at a maximum out-stroke and in which the rebound counteracts the piston rod movement, and a point of application at which the idle-stroke ends and the working-stroke begins. The vibration damper further includes an arrangement configured to adjust the point of application.

Abstract: A gas spring includes an outer tube; a base plate; a head plate; an inner tube mounted to extend between the head plate and the base plate; a piston/rod assembly mounted to reciprocate vertically in the inner tube between a retracted, compressed position and an extended, rest position; a valve ring coaxially mounted around the rod to reciprocate between the main piston and head plate; a primary gas chamber; a relief chamber; seals for preventing fluid flow from the primary and relief chambers; a passageway providing communication between the primary gas chamber and relief chamber; and, valve apparatus for controlling fluid flow between the primary and relief chambers. The valve apparatus operates to open and close the fluid flow as a function of the position and direction of travel of the piston/rod assembly.

Abstract: A powerful high frequency shock absorber/accelerator uses compressed air but maintains a substantially uniform level of force throughout retraction and extension strokes. A piston moving in an inner chamber compresses gas in the chamber. Initially, an aperture allows compressed gas to be pushed to an outer storage chamber surrounding the inner chamber. As the piston moves further, sealing structure seals gas coming through the aperture thereby isolating the compressed air in the outer chamber from the inner chamber. At the end of the retraction stroke the small amount of remaining air is vented to outside and the piston faces a small counterforce-generating member. When the extension stroke is initiated the counterforce-generating member moves the piston a small distance until the seal is broken. The force of the compressed air rushing back into the inner chamber drives the extension stroke. Additional embodiments include replacing outer chamber with external source of gas.

Abstract: A piston-cylinder unit including a cylinder in which a piston is guided so as to be displaceable axially, wherein the piston separates the cylinder into two work spaces which communicate via at least one bypass groove in the cylinder depending on the stroke position of the piston, wherein the cylinder is formed of multiple parts and a portion of the cylinder with the at least one bypass groove is displaceable axially relative to at least one further portion of the cylinder.

Abstract: The hydraulic cylinder or shock absorber arrangement has a cylinder unit limiting an inner space in which a medium in the form of a gas or a liquid is intended to be placed. A forwardly and backwardly movable piston unit is placed such that it can slide within the space that is defined by the piston into a first chamber and a second chamber. An inlet/outlet is defined in the respective chambers of the cylinder unit for the addition to and removal of medium from the chambers together with devices that co-acts in order to determine the relative position of the piston within the cylinder unit.

Abstract: A piston-cylinder assembly includes a cylinder, in which a piston rod with a piston is guided axially by a piston rod guide. A distance detection system is used to determine the position of the piston in the cylinder. The distance detection system includes a sensor and a transmitter. The sensor is mounted on the piston or on the bottom of the cylinder. Upon axial displacement of the piston, the transmitter travels a distance different from that traveled by the piston, the difference between the two distances being used to determine the position of the piston.