Abstract: A shock absorber is constructed with a hollow cylinder within which a first piston is disposed to move coaxially. A well is defined within the first piston to receive a second piston. The first piston is also provided with longitudinally extending dampening passageways and relief passageways. A cavity of variable volume filled with a compressible fluid, such as air, is defined between the two cylinders. At the start of a stroke of movement of the first piston within the cylinder, the additional length of the piston rod which enters the cylinder as the first piston moves toward the blind end of the cylinder increases pressure on the compressible fluid within the cylinder. The second piston is thereby pressed further into the first piston and ultimately closes off the dampening passageways, thereby preventing further movement of the first piston and increasing the dampening characteristics of the shock absorber.

Abstract: A hydraulic damper is designed, for example, as a piston/cylinder unit. The arrangement has a part (for example, a piston) forming a vibrational system by means of a spring. Vibrations acting on the damper arrangement are greatly attenuated virtually only in the resonant range of this vibrational system, because only in this case can vibrations of high amplitude be excited and a high dissipation of energy by way of hydraulic flows in channels and between cylinder chambers take place.

Abstract: The hydraulic damper has at least one restricted communication passage (47) between its two working chambers (8, 9) whose cross section is controlled by a viscous restriction valve (51) positioned via a control pressure of a fluid of a control damper with at least one secondary chamber (41, 42) delimited in a secondary cylinder (39) by a control piston (40), which cylinder and control piston are integrally attached, one to the main body (1), the other to the damping piston (4) of the damper, such that the pressure law of the control fluid positioning said valve (51) is linked to the relative displacements of the main body (1) and damping piston (4).

Abstract: A motion-damping device (10) includes a piston (18) moveably disposed within a housing (16) and dividing the interior of the housing into an upper chamber (20) and a lower chamber (22). An electrorheological fluid which fills both chambers can pass from one chamber to the other chamber via at least one fluid passageway (28) formed in the piston. Each passageway, tapered to form a relatively narrow neck portion, is in close proximity to an electrode that receives an electric potential for developing an electric field within the passageway to control the viscosity of fluid in the passageway.

Abstract: Door control apparatus is provided for a sliding door for use with a boat or a ship. The door control apparatus is unbiased in either direction and will substantially maintain any position in which it is placed, except during extreme rolling or pitching of the boat or ship due to heavy weather conditions. The door control apparatus provides for equal but opposite force to open the door as to close the door. The door control apparatus includes piston and cylinder means with fixed orifices. Other than the piston its associated parts, there are no moving parts to the mechanism.

Abstract: A tie rod device includes a vibration-absorbing damper. The tie rod comprises a tie rod assembly comprising first and second rods for interconnecting a rack shaft and a knuckle. The vibration-absorbing damper is interposed between the first and second rods for absorbing vibration transmitted from the knuckle.

Abstract: A hydraulic damper for use with a vehicular suspension system includes a reciprocating piston rod and piston in an inner cylinder. A piston valving is carried by the piston and controls the flow of fluid between upper and lower chambers of the inner cylinder. A base valving assembly controls the flow of fluid from the inner cylinder to a reservoir. A plurality of circumferentially-spaced slits are provided in the inner cylinder adjacent the base valve assembly. A control wheel having a plurality of openings corresponding to the slits is mounted inside the inner cylinder and rotatably fixed to the piston. As the vehicle is steered, rotation of the inner cylinder with respect to the control wheel selectively aligns the slits with the openings to permit fluid flow from the lower chamber to the reservoir, thereby providing steer-sensitive variable damping.

Abstract: A variable damping force shock absorber includes a cylinder tube defining therein two axially aligned fluid chambers separated by a piston. The fluid chambers are connected via first and second fluid paths for fluid communication therebetween. A high damping force generating valve is disposed in the first fluid path. A low damping force generating valve is disposed in the second fluid path. A variable orifice is also formed in the second fluid path. The variable orifice is associated with a control valve which adjusts fluid path area of the variable orifice. The control valve is axially shiftable for adjusting the orifice area. A pressure chamber is formed opposing one axial end of the control valve, which pressure chamber is in fluid communication with one of the fluid chamber via the variable orifice.

Abstract: A shock absorber in which a damping force is to be adjusted separately for the tension and the compression directions in which the shock absorber is equipped with separate throttle valves, one for basic damping and one for supplementary damping. In the device, the adjustable parts of the two throttle valves are embodied in the form of magnetically controllable coaxial sheaths. This results in an especially space-saving design, the sheaths and magnetic coils which can be integrated directly into a piston (5) of the shock absorber. The device is used for damping relative motions of two masses, in particular in resilient wheel suspension systems in vehicles.

Abstract: A shock absorber employs a seal structure which can sucessfully prevent a working fluid from causing leak flow for enhanced variation characteristics of damping force. The seal structure includes a seamless seal member applied on a piston and/or on an inner periphery of a piston rod guide member.

Abstract: 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 having first and second portions operable to store damping fluid. The apparatus further includes a piston assembly disposed in the pressure cylinder and having a valve body forming first and second flow passage for providing fluid communication between the first and second portions of the working chamber. The valve body forming first and second annular recesses adjacent the first and second portions, respectively, of the working chamber. The apparatus further including a first unloader disposed within the first annular recess and which is operable for controlling the flow of damping fluid through the first flow passage from the second portion to the first portion of the working chamber during compression.

Abstract: A hydraulic damper according to the present invention includes a cylinder, working fluid disposed in the cylinder, a piston partitioning the cylinder into two fluid chambers and including passages therethrough for providing fluid communication between the two fluid chambers, and a damping force generation mechanism. The damping force generation mechanism includes a large diameter valve disc mounted adjacent the passages, a smaller diameter valve disc stacked against the large diameter valve disc, an inner pressure chamber formed adjacent and in fluid communication with the passages, and an outer pressure chamber formed adjacent and in fluid communication with the passages and formed radially outwardly of the inner pressure chamber. A partition wall is formed between the inner and outer pressure chambers and a passage is formed through the partition wall for communicating between the inner and outer pressure chambers.

Abstract: A viscous damper wherein the viscosity of a fluid, such as an oil, is used to generate damping effect when the fluid is passed through a restricted orifice or slit. Electrodes are arranged to face each other across the orifice or slit so that an electric field is created in a direction which is transverse to the direction of the fluid flow in the orifice or slit. The voltage applied to the electrodes is controlled in accordance with a frequency of vibration of a vibrating member to be damped. The viscosity of the fluid is controlled by applying a voltage thereto, so that a desired damping effect is obtained within a wide range of the frequency of the vibrating body.

Abstract: A hydraulic shock absorber includes a cylinder, a piston axially slidably fitted in the cylinder so as to divide the interior of the cylinder into a first cylinder chamber and a second cylinder chamber, and a damping force generating mechanism mounted on the piston for generating damping force by controlling the flow of the working fluid between the two chambers. The damping force generating mechanism comprises first and second passages and first and second recesses. The first passage is formed through the piston oblique to the axis of the piston and connects the first and second cylinder chambers. The first recess is formed in one end of the piston on the side of the outlet end of the first passage so as to include the outlet end of the first passage. The second passage is formed through the piston parallel to the axis of the piston, at a circumferential position differing from that of the first passage, and connects the first and second cylinder chambers.

Abstract: A molded piston for a shock absorber is formed as a cylindrical member having a central, axial opening for receiving a piston rod. A plurality of unrestricted axial openings are provided in the piston radially outbound of the central opening and aligned substantially parallel to the axis of the piston to serve as primary flow passages. A plurality of axial grooves are provided on the circumference of the piston to serve as secondary flow passages. A flexible, circumferential valving ring is integrally molded at one end of the piston for permitting only one-way flow of fluid through the secondary flow passages as the piston reciprocates in an inner cylinder.

Abstract: A limited stroke hydraulic actuator which may be located in the structure of a steered axle in a shallow blind bore. The piston which may be slidably received in the bore is displaced by an adjustable protrusion secured to the steering system. Displacement of the piston causes hydraulic fluid to flow through an orifice from one side to the other. Resistance to flow of fluid through the orifice damps the motion of the piston and consequently the steering system. A spring returns the piston to an initial position when the steering system is removed from end of travel position.

Abstract: A hydraulic shock absorber employs first and second stage disc valves arranged in tandem fashion. The first stage disc valve is provided for acting on a relatively small pressure difference for enhanced damping characteristics at a relatively low piston stroke speed range. On the other hand, the second stage disc valve is provided for acting on a greater pressure difference for generating damping a force at a higher piston stroke speed range. The second stage disc valve is initially pre-loaded at a predetermined magnitude of load so as to set a pressure relief point of the second stage disc valve at a desired piston stroke speed for better damping characteristics of the shock absorber.

Abstract: In a damper for a steering device of a motor vehicle and more particularly a motor cycle a piston rod is axially movable with respect to the cylinder. The piston rod is provided with a piston inside the cylinder. The piston is provided with axial bores. The axial bores open into valve seat faces of the piston. Valve rings are allocated to the valve seat faces. Helical compression springs are located within the bores. These springs urge the valve rings towards respective opening positions. The valve rings are movable towards respective damping positions in response to the axial movement of the piston rod with respect to the cylinder. The valve rings have valve faces opposite to the respective valve seat faces. The valve faces are provided with projections towards the valve seat faces and with recesses adjacent these projections. So, a restricted fluid communication is obtained in the damping position of the respective valve ring.

Abstract: A viscous damper wherein the viscosity of a fluid, such as an oil, is used to generate damping effect when the fluid is passed through a restricted orifice or slit. Electrodes are arranged to face each other across the orifice or slit so that an electric field is created in a direction which is transverse to the direction of the fluid flow in the orifice or slit. The voltage applied to the electrodes is controlled in accordance with a frequency of vibration of a vibrating member to be damped. The viscosity of the fluid is controlled by applying a voltage thereto, so that a desired damping effect is obtained within a wide range of the frequency of the vibrating body.

Abstract: A hydraulic dashpot for supporting pipes or similar loads comprises a cylinder having a piston mounted for displacement therein, the piston setting-off the cylinder chambers which are in fluid communication with a fluid storage chamber, and the piston having an inner chamber housing a valve seat body of a main control valve. The main control valve includes a pair of piston-type valve members reciprocally carried by the valve seat body and biased by a spring. The inner chamber and valve seat body have opposing peripheral surfaces and one of these surfaces is provided with a groove running the length thereof and at each end being merged with axial grooves which places the axial opposite ends of the inner chamber in fluid communication with each other to prevent blockage/locking-up during dashpot operation.

Abstract: A torque support for drives riding on trunnions, in particular for converter tilt drives, including a gear housing mounted on the trunnion which is rotatable about an axis of rotation, a drive motor attached by a flange or bolting to a step-down gearing which engages, via pinion, with a larger gear wheel fixed for rotation on the trunnion. The torque support includes a pair of guide rods located symmetrically to the axis of rotation of the trunnion, each guide rod includes a first and second oppositely positioned part, the first and second rod part have an upper and lower end and a respective free end opposite thereto; the upper ends are pivotally mounted on the gear housing and the lower ends are connected to each other via either a compression-tension bar or torsion shaft, upon which the lower ends are pivotally mounted.

Abstract: The bidirectional valve assembly provides for selection of retraction and extension damping characteristics which can accommodate relatively large separation of damping curves. Two cooperable valve discs or ring members are provided which function in unison to resist fluid flow in a first fluid flow direction, while a single one of the valve ring members functions primarily to resist fluid flow in the other direction. In a first embodiment, one of the two cooperable valve ring members comprises a compliant retainer or fulcrum against which the other valve ring member moves in unison therewith to produce relatively low damping in retraction. The other valve ring member moves alone in extension to produce relatively high damping. In an alternative embodiment, the two cooperable valve ring members are superimposed and move in unison during extension, as dictated by their combined stiffness.

Abstract: In an illustrative example, an oscillation damper for damping the steering movement of the handle bar of a motorcycle comprises a cylinder and a piston rod axially movable with respect to the cylinder. A damping piston is provided at the inner end of the piston rod and divides the cavity within the cylinder into two working chambers. These working chambers are interconnected by at least one axial bore through the piston. Valve discs are provided on both axial end faces of the piston. These valve discs are fixed to the piston in their respective central areas. Circumferential areas of the valve discs define circumferential gaps with the respective end faces. In response to the velocity of axial relative movement of the piston rod with respect to the cylinder the circumferential areas of respective valve discs are approached to the respective end faces. So the damping resistance is increased.

Abstract: An automatic derailleur shifter is disclosed which includes a hollow cylinder body and a piston rod movable within the cylinder. The piston rod carries a dual element piston within the cylinder body in a manner to permit substantially unrestricted fluid flow through the piston when the piston rod is moved in a first, upward direction and a greatly restricted fluid flow when the piston rod is moved in the second downward direction. A first, fixed piston element is fabricated of diameter less than the inner diameter of the cylinder to allow unrestricted fluid flow thereabout. A second, movable piston element is provided and below the fixed piston element includes a flared skirt for sliding, sealing engagement between the movable piston element and the cylinder. A small, restricted longitudinal channel is provided through the fixed piston element which terminates at its lower end at a circular channel.

Abstract: A shock absorber is provided a piston stroke dependent variable shock absorbing characteristics by a first and second flow restrictions associated with a piston. The first and second flow restrictions are arranged in a fluid path for communicating first and second working chambers defined within a shock absorber cylindrical housing in series. The first flow restriction associated with an orifice forming a part of the fluid path and has a predetermined relief pressure, for providing a predetermined first fixed flow restriction rate in response to a pressure difference between the first and second chambers smaller than or equal to the relief pressure and providing a second variable flow restriction rate in response to a pressure difference between the first and second chambers greater than the relief pressure. The second flow restriction is associated with the orifice for providing a third variable flow restriction rate variable depending upon the pressure difference between the first and second chamber.

Abstract: A hydraulic shock absorber has a disk valve assembly which is formed by successively stacking up a first disk valve having arc-shaped or circumferentially extending opening provided therein at positions close to the inner periphery thereof, a second disk valve having notches which extend from the outer periphery thereof to the radially outer edges of the corresponding openings provided in the first disk valve, and a predetermined number of annular third disk valves. A respective such disk valve assembly is provided at the downstream end of each of the extension- and contraction-side passages which are formed in a piston. Thus, it is possible to obtain a higher level of damping force in a low piston speed region than in the case of a conventional valve mechanism that uses a fixed orifice, and damping characteristics can be set as desired.

Abstract: An adjustable fluid amplified shock absorber including a casing having a chamber, a piston rod slidable in the casing, a piston head mounted on the piston rod within the chamber, an adjustable channel located between the piston head and piston rod for providing different levels of fluid amplified flow, the adjustable channel being changed in size by axially moving the piston head relative to the piston rod by a threaded connection therebetween, and serrations on the piston head for engagement with grooves on the casing to hold the piston head against rotation while the piston rod is being turned during adjustment.

Abstract: A variable rate shock absorber having the interior of a working cylinder divided by a piston into an upper and lower working chamber. The lower working chamber is connected to a reservoir by a bi-directional valve member. A solenoid valve housed in a hollow piston rod has an actuated state connecting the upper working chamber to the reservoir. The output of the solenoid valve is connected to the reservoir by an axially disposed telescoping cylinder passing through the piston and the bi-directional valve member. Other embodiments are also disclosed.

Abstract: The invention discloses a lifting telescoping tube which comprises a first tube receiving a pressure liquid, a second tube filled with a pressure gas, a first piston affixed to one open end of the second tube having a first through-passage and a second through-passage intercommunicating the first and second tubes, a check valve disposed in the second through-passage for preventing the pressure liquid from flowing into the first tube from the second tube, a second piston provided in the second tube dividing the second tube into a variable-volume liquid chamber and a variable-volume gas chamber.

Abstract: A damper assembly comprises a cylinder enclosing a plunger mounted on a piston rod and associated with an auxiliary plunger which is yieldably held against the main plunger by a spring. Ascent of the cylinder relative to the plunger allows a high damping force to be obtained by causing the damping liquid to pass around the exterior of the main plunger, along a first flow path, whereas descent of the cylinder allows the spring to yield and to open a larger cross-section third flow path between the auxiliary plunger and the main plunger for a lower damping force to be obtained. The damping force exerted in the first-mentioned direction is limited by the effect of a pressure relief valve which opens to allow flow of hydraulic fluid through the auxiliary plunger along a second flow path once a predetermined damper force has been attained. The cylinder is coaxially surrounded by a pre-load spring. The damper is incorporated in an anti-bounce package support in a yarn winder.

Abstract: Suspension damper with double drum variable valving within the confines of the piston which strokes within the damper that is rotatable to predetermined stations in one revolution to provide a wide range of jounce and rebound damping characteristics and rotatable in an opposite direction from any station for maximized valve restriction producing optimized vehicle lift and dive control.

Abstract: A shock absorber includes a piston for partitioning the interior of a cylinder into two liquid chambers while affording communication between both liquid chambers through a plurality of ports, and a valve body biased toward the piston for opening and closing the ports. The piston has a ring portion which forms a path in cooperation with the valve body for regulating the amount of liquid flowing from the ports around an outer peripheral edge of the valve body. An effective area of the ports is larger than the maximum effective area of the path.

Abstract: A hydraulic damper includes a cylinder filled with working oil, a piston rod extending axially in the cylinder, and a piston slidably disposed in the cylinder and fixed to the piston rod, the piston having an oil passage defined therein. A valve structure in the hydraulic damper has a spacer disposed around the piston rod and on one surface of the piston, a leaf valve disposed around the spacer for normally closing an end of the oil passage at the piston surface, and a restriction plate disposed around the piston rod and mounted on the spacer and the leaf valve for allowing the leaf valve to open the end of the oil passage only during one of compression and expansion strokes of the piston with respect to the cylinder.

Abstract: The invention relates to an arrangement for damping shifting movements in a mechanical, synchronized multispeed transmission. Where such shifting movements are performed with the aid of a servo-mechanism, for exmaple a pneumatic piston cylinder unit, there is the risk that the gear teeth will be damaged when brought into engagement with each other. In the arrangement according to the invention, a pressure medium-filled damper is used without any communication with a separate pressure medium reservoir, thus eliminating the risk of malfunction due to foam formation in the pressure medium as well as achieving a desirable damping of the shifting movement. The invention is characterized for this purpose in that the piston in the damper is arranged on a piston rod which extends through the cylinder portion of the damper, so that upon relative movement between the piston and the cylinder portion, the volume of the damper filled with pressure medium remains constant.

Abstract: An apparatus for damping courses of motion in particular for damping resilient wheel suspension systems in vehicles, having a damping piston that is displaceable inside a jacket tube which separates two work chambers and is connected to a piston rod. Between the work chambers there are flow connections, through which a flow is possible in only one direction, because of a unilateral actuation direction of separate check valves. The flow connections have throttle cross sections the size of which is definable by the position of a control slide inside a guide bore. The control slide is actuated via a control rod leading outside the jacket tube and is movable with two degrees of freedom. A motion in the direction of the first degree of freedom varies the throttle cross sections in the same direction, while a motion of the control slide in the direction of the second degree of freedom varies the throttle cross sections in opposite directions.

Abstract: A gas spring with end positions damping has a cylindrical housing filled with a fluid under pressure, in which a piston rod, sealingly extending from one end of the housing, is disposed to be coaxially slideable and on the inner end of which a piston is attached. To create an end position damping that is simple in structure, and which can be used purely pneumatic, purely hydraulic or hydropneumatic, an auxiliary piston in the form of a throttle piston is slidingly disposed on the piston rod, which is supported via an energy accumulator towards the end of the housing where the piston rod exits. The piston abuts against this auxiliary piston at the end of the extension movement of the piston rod. Its throttle effect is larger during movement in the direction toward the end where the piston rod exits than in the opposite direction.

Abstract: An elongation type oil damper includes a cylinder containing oil in the inside, a hollow plunger slidably fitted in the cylinder, containing oil in the inner space thereof and projecting from a rod end of the cylinder for undergoing elongation and contraction strokes, and a floating piston inserted in the inner space of the plunger for axial movement in a state biased toward the end of the plunger projecting into the cylinder. The plunger is provided at the projecting end thereof with communication holes through which the oil in the plunger and the oil in the cylinder join each other and also with a valve capable of being moved axially to close some of the communication holes in the elongation or contraction stroke of the plunger.

Abstract: A piston-cylinder type oil damper includes a cylinder containing oil, a piston inserted within the cylinder for dividing the interior of the cylinder into a head chamber and a rod chamber, a rod passing through the rod chamber and projecting out of a rod end of the cylinder, a cover slidably penetrated by the rod and closing the rod end, and a floating piston inserted within the head or rod chamber so as to form an air chamber. The piston is provided with axial through-holes for causing the oil within the head and rod chambers to flow therethrough in opposite directions. The rod is provided with an axially movable valve plate brought into contact with one side of the piston for partially shielding the through-holes.

Abstract: This invention is a liquid filled type vibration insulating device, wherein a partition member dividing a closed chamber into two liquid chambers is provided with a gas chamber isolated from both liquid chambers and a portion of the gas chamber adjacent to at least one of the liquid chambers is partly or wholly defined by a flexible diaphragm, and is to prevent the increase of dynamic spring rate in the vibration insulating device due to high frequency vibrations by absorption of vibration through deformation of a flexible diaphragm when high frequency, small amplitude vibrations are particularly transmitted to the device.

Abstract: A piston valving and seal mechanism is for a fluid shock absorbing device. A piston is mountable on a piston rod of the device. The piston has an outer periphery, rebound chamber face and compression chamber face. A piston seal is movably mounted in a groove where the piston rebound chamber face and outer periphery meet. The seal is adjacent compression passages in the outer periphery. A seal retainer plate along the piston rebound chamber face with a backing spring bias the seal. The plate is raised from the rebound chamber face and includes passages through the plate for fluid flow through the plate and into underlying recoil passages in the piston. The seal acts as a check valve for the compression passages. A separate recoil passage valve plate on the compression chamber face, with a backing spring, acts as a valve for the recoil passages.

Abstract: An arrangement for varying the damping of a suspension component such as a vibration damper, gas spring or hydro-pneumatic suspension. In one embodiment, an electronic system is mounted in association with the cylinder of the suspension component to form a variable damping system which, with the aid of other circuitry, varies the damping system of the piston. A vibration damping system for motor vehicles, in which there is a damping element, which has a work cylinder, is divided into two work chambers by a piston. This cylinder contains a damping medium. There is an electronically-controlled bypass valve disposed parallel to the work cylinder. A desired, variable damping force can thereby be achieved in the decompression and compression stage, between two fixed and specified fundamental curves, by controlling the current sent to an electromagnet.

Abstract: A snubber with an integral test structure which permits the snubber to be tested for drag, lockup and full load pressure characteristics without disconnecting it from between two external members between which it is mounted including a cylinder with opposite end walls, a piston mounted on a piston rod extending through the end walls and dividing the space between the end walls into first and second chambers which are filled with hydraulic fluid, a first clevis connecting one end of the piston rod to a first external member, a housing mounted for sliding movement on the cylinder and including a second clevis connecting it to a second external member, a plurality of selectively removable pins for fixedly attaching the housing to the cylinder or permitting it, when removed, to slide relative thereto, and ports in communication with the two chambers for conducting hydraulic liquid thereto or exhausting hydraulic liquid therefrom.

Abstract: A road vehicle, particlarly a human-powered type, comprises a rotatable chassis section rotatable with respect to a fixed chassis section, a steering mechanism and a banking mechanism controlled by the steering mechanism for automatically rotating the rotatable chassis section with respect to the fixed chassis section about the horizontal axis whenever the steering mechanism is actuated to steer the vehicle. The vehicle also comprises a novel hydraulic shock absorber and a novel hydraulic rear-wheel suspension, both of which are influenced, e.g., stiffened or loosened, according to the load applied to the vehicle.

Abstract: A liquid spring shock absorbing device 8 comprising an hydraulic piston 10 with an integral surge valve 14. The hydraulic piston 10 is positioned within a fluid filled piston housing 12 and is made up of a piston body 16, a spring reaction plate 22 and a piston heat 18. A large annular spring 30 and a small annular spring 36 are positioned adjacent to the spring reaction plate 22. Short duration shocks are transmitted by the fluid to cause rotation of annular spring 36 which opens relief valve port 42. Long duration, high intensity shocks cause compression of both annular springs, opening of relief valve port 42 and movement of hydraulic piston 10.

Abstract: A re-chargeable self-contained servo cylinder for the control of force with variable piston positions under load includes an elongated cylinder housing having a tubular body with open receiver end and closed opposite end by a cap which includes a central port provided with integral directional check valve for supply of working fluid under pressure during cylinder charging, a piston and rod assembly slidably received inside the cylinder including a rod end closure with seals slipped over piston rod and secured inside the open receiver end so as to protrude an end portion of the piston rod for attaching to a load carrying platform, an integral flow control valve with control rod inside an elongated central bore of the piston rod for control of working fluid communication between the sides of the piston via a fluid opening provided therein when cylinder becomes pressurized by the working fluid and for maintaining a given piston position inside cylinder fixed when the flow control valve is closed thereby also fix

Abstract: A railroad vehicle end-of-car center coupler includes a telescopic energy absorber comprising a hollow cylindrical plunger in a cylinder having one closed end. The plunger has an aperture in its inner end wall. A perforated metering tube is fixed in the closed end wall by a special fixing arrangement. It projects through the aperture and carries an annular piston head which slides in the bore of the plunger. A floating piston divides the interior of the plunger into a gas space and a liquid chamber. Four direct acting pressure relief valves are mounted in the piston head. Conduits through the tube connect their inlets to respective ones of four axially-spaced ports in the outer surface of the tube so that they all communicate with the annular chamber that surrounds the tube within the plunger when the absorber is compressed and so that they are progressively cut-off from such communication during the final stages of extension of the absorber.

Abstract: A hydraulic shock absorber exhibiting a constant vibration damping force. The shock absorber is provided with a deep groove formed on an upper surface of a piston in a circle where piston ports formed through the piston lie and communicated with the piston ports. The groove has an outer peripheral wall in such a manner that an upper opening is upwardly enlarged.

Abstract: The present invention provides a shock absorber of monotube or twin-tube configuration wherein the piston within the shock absorber includes an electromagnetically operable bypass valve, the electromagnetically operable valve being controlled remotely from the outside of the shock absorber via an electrical connection which extends along the piston rod. In a twin tube configuration according to the present invention, the foot valve assembly also includes an electromagnetically operable bypass valve which is remotely controlled from the outside of the shock absorber via an electrical connection. These electrical connections do not affect the overall design of the shock absorber and can thus be easily included in a vehicle design. Further, these electrical connections can be connected to a microprocessor so that the shock absorber valves are controlled by the microprocessor dependent upon the values of certain parameters, e.g. speed, load, fed to the microprocessor from appropriate sensors.

Abstract: A novel spring-loaded damping unit having a piston mounted for sliding movement within an enclosed cylindrical housing, the piston being provided with a throttle for a controlled exchange of pressure between chambers on opposite sides of the piston wherein the throttle comprises one or more steel washers biased against seats engaging outer and inner peripheral positions on opposite surfaces of the washer. In the case of more than one washer a resilient layer may be provided between them.

Abstract: A suspension strut for an automotive vehicle comprises a working cylinder, piston rod, a pressure piston carried within a working cylinder upon the piston rod, a first rod bearing located at one end of the working cylinder and a second piston rod bearing extending telescopically from piston rod and slidably engaged with the working cylinder.