Abstract: A cabin control valve assembly for a vehicle includes a cabin control valve with at least one port P, and at least one solenoid direction control valve that is integrated with the cabin control valve at the at least one port P such that pressurised air that enters through an inlet port of the cabin control valve reaches an inlet of the at least one solenoid direction control valve. The at least one solenoid direction control valve is configured to allow, based on at least one signal indicative of at least one parameter related to the vehicle, delivery of pressurised air to a corresponding cylinder coupled to the cabin control valve assembly for operation of the cylinder.

Abstract: The present disclosure describes composite actuator piston rods and methods for making such rods. Composite actuator piston rods of the present disclosure may include a composite actuator rod tube having a flared end, an insert, wherein the insert has a complementary shape to the flared end, a piston head concentrically surrounding the flared end of the composite actuator rod tube, and a piston head nut configured to threadingly attach to the piston head.

Abstract: A fluid pressure operated actuator device, comprising: a body defining a first chamber (2) comprising an inlet in fluid communication with a pressurized fluid source (1); and a moveable element (5) mounted in the first chamber, the moveable element comprising an operative end (4) and partition means (3) configured to separate a first region of the first chamber comprising the inlet from a second region of the first chamber opposed to the first region during use of the device, the moveable element being moveable relative to the body between an extended configuration and a retracted configuration, with movement from the retracted configuration to the extended configuration occurring in response to a pressure differential across the partition means, wherein the actuator device includes a first passageway (7) for allowing passage of fluid from the pressurized fluid source to a second chamber (9) in the operative end of the moveable element, and a second passageway (8) for allowing passage of fluid from the second

Abstract: A port plate is disclosed for use with an axial pump. The port plate may have a cylindrical plate member with a head-end face and a piston-end face located opposite the head-end face, at least one inlet port formed within a first half of the plate member and extending from the head-end face through the piston-end face, and at least one outlet port formed within a second half of the plate member and extending from the head-end face through the piston-end face. The port plate may also have at least one timing hole formed within the plate member at a leading end of the at least one outlet port and passing from the head-end face through the piston-end face, and an arcuate spherical groove extending from the at least one timing hole to the at least one outlet port.

Abstract: The pressure in the downstream side of a pneumatic cylinder's piston (1g) is allowed to exhaust. At a certain point, the downstream exhaust is blocked, causing the pressure to rise against the downstream side of the piston. A valve (5) opens when the downstream chamber has reached its maximum pressure. The output of valve (5) opens a second valve (3). Valve (3) rapidly exhausts the remaining air on the downstream side of the piston (1p). With no air on the downstream side of piston (1p), piston (1p) stops and does not bounce back. Changing the volume of inactive regions (1m) or (1n) sets the stopping point to coincide with the end of stroke of piston (1p). A check valve (4) and orifice (6a) allow the air in the pilot port in valve (3) to slowly bleed out, resetting valve (3) for the next cycle.

Abstract: A cushioning system for a pneumatic cylinder powered differential engine door opening and closing device for use in passenger transportation vehicles wherein the cushioning initiation point can be adjusted. This cushioning initiation point is adjusted through the use of a linearly adjustable slider member within the large cylinder. The slider is linearly adjustable through the use of an adjustment screw located outside of the pneumatic cylinder and allows one to adjust the time and the mode of the opening/closing of power doors, without disassembly of the cylinder, and significantly improve the safety of the passenger.

Abstract: A hydraulic cylinder cushion including a cylinder having a longitudinal axis and an inner chamber, a piston rod having a base, a cushion spear having a spear base, a shaft extending from the spear base, and a spearhead arranged opposite the spear base, the spearhead comprising a hemispherical portion connected to the shaft, wherein the hemispherical portion is diametrically larger than the shaft, and an end cap having a bore, wherein the end cap is secured to a first end of the cylinder such that the bore faces the inner chamber and is substantially aligned with the longitudinal axis, the piston rod is slidingly arranged within the inner chamber along the longitudinal axis such that the base faces the end cap, the cushion spear is pivotably secured to the base of the piston rod and extends toward the bore, and the bore is adapted to receive the cushion spear therein.

Abstract: A cushion arrangement for smoothing stage changes in an hydraulic cylinder and including at least one compression chamber of variable volume with a movable and/or deformable chamber wall element displaceable by at least one of the pistons when approaching the transition zone between first and second stages of displacement. The compression chamber is operatively connected to a gas volume to be compressed upon displacement of the chamber wall element.

Abstract: A gasket includes a damping buffer for a piston that can be charged with a pressure medium and that can be moved back and forth axially in a cylinder pipe and includes at least one static seal for sealing the cylinder pipe vis-à-vis a cover connected to the face of the cylinder pipe and a dynamic seal having at least one dynamically loaded sealing lip that, during the proper use of the gasket, can be laid against the surface to be sealed of a damping journal that is connected to and axially movable back and forth with the piston and that has at least one flow-guiding connection opening that connects the axial faces of the gasket.

Abstract: A cushion ring which is used between a rod-side cylinder head and a piston rod of a fluid-pressure cylinder and which is externally fitted on the piston rod to cushion a shock in the vicinity of the farthest extended end of cylinder includes a throttling groove that has a V-shaped cross section. The throttling groove extends from an appropriate position of the cushion ring to a rod-side end part and functions to throttle the flow of a working fluid flowing from a rod-side fluid chamber to an input/output port provided in a rod-side cylinder head. The throttling groove is provided at the outer periphery of the cushion ring. The throttling groove terminates at a rod-side end part with an end guide face that guides the working fluid toward a slantwise outward direction of the cushion ring.

Abstract: A variable rate suspension system for a boom sprayer including a lift assembly and chassis. The suspension system includes a needle valve fluidly connected to a hydraulic accumulator and a first and second lift arm cylinder. A control block provides hydraulic fluid to the system and lift arm cylinders. Dampening of vertical accelerations encountered by the chassis and transmitted to the boom sprayer through the lift assembly is controlled by adjusting the rate hydraulic fluid flows from the cylinders into the accumulator using the needle valve.

Abstract: A gasket includes a damping buffer (1) for a piston (2) that can be charged with a pressure medium and that can be moved back and forth axially in a cylinder pipe (3) and includes at least one static seal (4) for sealing the cylinder pipe (3) vis-à-vis a cover (5) connected to the face of the cylinder pipe (3) and a dynamic seal (6) having at least one dynamically loaded sealing lip (7) that, during the proper use of the gasket, can be laid against the surface (8) to be sealed of a damping journal (9) that is connected to and axially movable back and forth with the piston (2) and that has at least one flow-guiding connection opening (10) that connects the axial faces (11, 12) of the gasket.

Abstract: A fluid actuator with fluid limit valves (550, 551) and adjustable mechanical limits enables the construction of fluid linkages which are able to completely replace mechanical linkages. In a fluid circuit comprising of two or more fluid actuators, the pistons (102) of the fluid actuators can become uncorrelated when fluid leakage occurs. At the piston (102) extension and retraction limits, fluid limit valves (550, 551) open. The open fluid limit valves (550, 551) allow fluid to bypass pistons (102) and/or allow fluid from an external source to compensate the fluid leakage. The fluid bypassing pistons (102) at their extension or retraction limit and/or externally supplied fluid forces the uncorrelated pistons (102) to reach their extension or retraction limit as well. The fluid actuator with adjustable mechanical limits have one or more additional pistons (686, 688), which have an adjustable separation from the main piston (102) or end of cylinder.

Abstract: A vane type hydraulic rotary actuator incorporates a fail-safe brake for preventing movement of the device's rotor relative to a housing in which the rotor is journaled. The brake has a spring-biased piston that is forced to a locked condition whenever applied hydraulic operating pressure acting on the vane falls below a predefined limit. The rotary actuator also incorporates an improved sealing arrangement that prevents egress of hydraulic fluid from a high pressure chamber on one side of the vane to a low pressure chamber on the opposite side of the vane.

Abstract: A cushion ring which is used between a rod-side cylinder head and a piston rod of a fluid-pressure cylinder and which is externally fitted on the piston rod to cushion a shock in the vicinity of the farthest extended end of cylinder includes a throttling groove that has a V-shaped cross section. The throttling groove extends from an appropriate position of the cushion ring to a rod-side end part and functions to throttle the flow of a working fluid flowing from a rod-side fluid chamber to an input/output port provided in a rod-side cylinder head. The throttling groove is provided at the outer periphery of the cushion ring. The throttling groove terminates at a rod-side end part with an end guide face that guides the working fluid toward a slantwise outward direction of the cushion ring.

Abstract: Cushion chambers (8) disposed in the vicinity of both ends of a hydraulic cylinder (1) to throttle inflow or outflow of an operating oil caused by a piston (5) moving close to a piston stroke end, pressure sensors (16, 17) to detect pressures in the cushion chambers (8), and a control valve (13) disposed in a passage to supply/drain the operating oil to and from oil chambers (6, 7) of the hydraulic cylinder (1) for varying a flow amount of the operating oil are provided. A controller (9) varies an opening degree of the control valve (13) within a piston stroke end range based upon outputs of the pressure sensors (16, 17), adjusts a cushion pressure and controls a moving speed of the piston (5). Thereby deceleration degrees of the piston (5) can be freely adjusted within the piston stroke end range based upon a change of the operating conditions of the hydraulic cylinder (1).

Abstract: In a guide system with a pneumatic stop structure comprising a cylinder with a piston including a piston seal element movably disposed in the cylinder and a piston rod connected to the piston and extending from the cylinder wherein a displacement chamber is formed at one side of the piston, the cylinder has a cross-section which steadily increases toward the end of the displacement chamber and the piston seal element which, in the area of the smallest cylinder cross-section is in sealing engagement with the cylinder wall is out of sealing contact with the cylinder wall at the opposite end of the cylinder where the cylinder has an increased diameter.

Abstract: A hydraulic actuator is provided for controlling relative movement between first and second structures between which the actuator is mounted, for example between a boom and the base frame of an agricultural sprayer, while providing some resilience in the form of suspension. The actuator comprises a piston cylinder having a floating cushion piston supported within the cylinder end to support the piston within the cylinder in a retracted position at a prescribed spacing from the cylinder end. The piston can thus be deflected from the retracted position in either direction using a pressure relief mechanism so as to provide some flexibility to the actuator to accommodate the varying forces between the pair of relatively movable structures between which the actuator is mounted. The cushion piston requires no additional electrical switches or controllers and can be part of the hydraulic circuitry of the actuator so as to provide a simple, low cost actuator with integral suspension.

Abstract: A hydraulic control device having a hydraulic actuator with a cylinder space, in which a piston is accommodated. In the cylinder space the piston bounds a first chamber and second chamber. The housing is provided with a first and a second connection for the supply and discharge of hydraulic fluid, in communication with the first and the second chamber by way of a first and a second opening. The damping means are achieved by the fact that the piston is provided with shut-off means, which are designed to shut off the second opening of the cylinder space before the piston/piston rod assembly reaches an end position. The hydraulic actuator is further provided with a third connection, which by way of a third opening is in communication with the second chamber in any position of the piston. The hydraulic control device further comprises a throttling facility.

Abstract: A variable rate covering system for open top vehicle containers includes a hydraulic actuating system for pivoting arms carrying a roll up cover wherein the fluid flow rates to the hydraulic cylinders are reduced during the initial and final phases of the stroke to reduce acceleration and impact forces on the arms, cover and components, and normal fluid flow rates are provided during central phase movement without significantly affecting overall cycle time. The hydraulic cylinders are provided with metering orifices that reduce fluid flow rates to and from the cylinder pressure chambers for predetermined portions of the stroke length, thereby cushioning the pivoting mechanism at the terminal positions.

Abstract: Described is a system designed to control the slit valve used to isolate chambers in cluster tools used in integrated circuit (IC) fabrication. This method changes the slit valve door actuator pneumatic pressure and movement during the closing sequence. As the door nears the fully closed position, its speed is reduced. This results in a soft touch landing or seating of the door and reduces the number of particles generated over systems incorporating higher pressure in the door closure. Once the door is seated in a fully closed position, higher pressure is applied to maintain a tight seal between chambers. By reducing the particles generated, the overall IC yield for both production and test wafer lots will improve. Reducing wear on the door and door seat, fewer parts such as the door, door seat and slit valve O-ring are consumed, and both scheduled and unscheduled maitenance times are shortened.

Abstract: A cushion ring 26 enters the inner circumference of a cushion seal 34 near the end of a piston stroke, the cushion seal 34 being free to displace by a certain amount in the axial direction of a piston rod 23 in a cylinder head 28, and exerts a cushion effect by restricting oil flow from an oil chamber 24 in a cylinder tube 21. A spacer 35 is disposed on the inner side of this cushion seal 34 in the axial direction, and is free to displace by the same amount as the cushion seal 34. When the cushion effect is produced, the spacer 35 comes in contact with the cushion seal 34 to interfere with the vibration of the cushion seal 34.

Abstract: A pressure medium-actuated working cylinder axially displaceable between two end positions in a cylinder space, with opposite changes in, the volumes of two cylinder chambers on its two sides. A damping element is arranged on one side of a piston. A passage aperture is located between one cylinder chamber and a cylinder connection when the piston runs into one end position forming an annular throttle gap with the passage aperture for outflow of pressure medium. For a high damping capacity, the outer surface of the damping element is shaped to have a maximum diameter at the beginning of the passage aperture and, after a surface section, a small diameter, A middle diameter lies between the maximum diameter and the small diameter.

Abstract: At a step of pressurizing a workpiece after reducing a speed of a piston rod at an end of a forward stroke of the piston rod by restrictively allowing compressed air to flow out of an exhaust-side pressure chamber, operation of a rapid exhaust valve is triggered by reduction of internal pressure of the exhaust-side pressure chamber to lower pressure than internal pressure of a pressurizing-side pressure chamber to thereby directly open the exhaust-side pressure chamber into the atmosphere through the rapid exhaust valve and rapidly reduce back pressure of a main piston remaining in the exhaust-side pressure chamber.

Abstract: A hydraulic cylinder in which a recess (21) is formed in a piston rod (3) side end surface (20) of a piston (4) so that the recess (21) serves as an axial fitting portion, and an end of the piston rod (3) is fitted into the recess (21) of the piston (4) to ensure the coaxial relationship between the piston rod (3) and the piston (4). Axial threaded holes (24) are formed in an end surface (23) of the piston rod (3) and axial bolt through-holes (25) are formed in the piston (4). The end surface (20) of the piston (4) is disposed in face-to-face contact with the end surface (23) of the piston rod (3), and under the condition bolts (22) are inserted through the bolt through-holes (25) and screwed into the threaded holes (24) to fix the piston (4) to the piston rod (3). Accordingly, the strength of a piston connecting portion can be improved with a simple structure without use of any special high-strength material for the piston rod and without any special heat treatment.

Abstract: A pneumatic cylinder provided with a damping device to decelerate the piston inside a piston chamber at an end of its working stroke, while reducing the impact forces. The damping device comprises a restricted flow path for the fluid and a closing member for an inlet-outlet port which is supported by a helical spring extending from one end of the piston; an open cavity at the front end of the piston is designed to receive the closing member and/or the helical spring during damping at the end of the working stroke. Axially extending guide for the closing member are provided inside the piston chamber.

Abstract: In a linear actuator in which a slide table on a pedestal is caused to reciprocate linearly by two air cylinder mechanisms mounted in the pedestal, exhaust holes are provided to positions adjacent to ports, flow rate restricting mechanisms for restricting a flow rate of exhaust are provided between the exhaust holes and the ports, and pieces of cushion packing for being positioned over one of through holes of the ports on an exhaust side immediately before the piston reaches a stroke end is provided to an outer peripheral face of the piston to cause compressed air in pressure chambers to be discharged from the exhaust hole through the flow rate restricting mechanism.

Abstract: A lost motion cylinder has a hydraulic cylinder having a moving piston therein wherein the piston head divides the cylinder into first and second compartments; a first conduit connected to the second compartment of the cylinder to deliver a flow of lubrication oil therein; a second conduit connected to the upper portion of the cylinder to return oil therein to a reservoir; a third conduit interconnecting the first and second conduits; a first check valve in the first conduit to permit oil to flow only towards the cylinder; a second check valve in the third conduit only to permit oil to flow from the second conduit to the first conduit; and an adjustable flow control element in the second conduit whereby the flow of oil from the cylinder to a reservoir can be selectively adjusted wherein trapped oil in the second conduit will cushion the cylinder on the upward stroke of the piston; and trapped oil in the first and second conduits will cushion the cylinder on the downward stroke of the piston.

Abstract: The invention relates to a shockproof hydraulic cylinder that has a cylinder housing (1), in which a plunger (4) that is driven via a plunger shaft (10) is arranged to move axially, and optionally a hollow-cylinder damping plunger (11). Using different embodiments, an end-position damping is carried out on one or both sides. Plunger shaft (10), plunger (4) and damping plunger (11) can be designed in a hollow-cylinder form.

Abstract: A small-sized and inexpensive air cylinder with a cushion mechanism having a simple structure is provided. Therefore, discharge outlets for discharging cushioning air are disposed in positions closer to ends of the stroke than the openings of the ports in the cylinder tube, respectively, and check valves and throttling mechanisms are arranged in parallel between discharge outlets and ports, respectively. On the outer peripheral surface of the piston, one of the piston packing rings is disposed in one position which does not pass through the opening of the port while another of the piston packing rings is disposed in another position which passes through the opening but does not pass through discharge outlet, when the piston reaches the terminal ends of the stroke.

Abstract: A refuse collection truck may be combined with a relatively larger refuse container having a cart lifting apparatus supported on such container. The truck has dump arms for selectively dumping the larger container. The cart lifting apparatus has a dumper actuator for lifting and dumping the contents of a residential refuse collection cart into the relatively larger refuse container. The container may be removably mounted on the collection truck through corresponding matable lift forks on the truck and fork channels on the container. The container preferably may be a front end load container box. Different forms of cart lifters may be used, for picking up different styles of collection carts, such as having either one or two lift pickup points (i.e., either European or domestic style carts). Different types of dumper actuator may be used, including either hydraulic or pneumatic systems, and including either rotary motors or lifting cylinder and piston combinations.

Abstract: A pressure medium driven device has a cylinder having a cylinder tube, means forming a discharge outlet for a pressure medium, a piston movable in the cylinder over a stroke having a stroke end which is dampened by a counter pressure generated by throttling the pressure medium within a dampening area prior to its dissipation into the discharge outlet, a piston ring held between the piston end the cylinder in the dampening area and used as a throttle, a dampening sleeve provided in the cylinder for guiding the piston into an end position, the piston ring extending under the action of internal tension beyond a piston diameter and expanding to a maximum internal diameter of a cone, the dampening sleeve having an internal cone causing a progressive dampening, the piston ring having a slit with a minimal width in the cylinder tube, the dampening sleeve being provided in the dampening area with radial boreholes which duct the pressure medium into longitudinal slots from which it reaches the discharge outlet.

Abstract: A rotary actuator including a housing provided with a fluid actuated drive assembly operatively connected to a rotary plate arranged to effect the drive thereof, wherein the housing and the rotary plate are provided with complementary cooperating stop abutment and groove or track for limiting the angular rotation of the rotary plate in either the clockwise or counterclockwise rotation. An adjustment is provided to adjust the angular rotation of the rotary plate. Also provided is a control or adjustment for independently regulating the speed of rotation of the rotary plate either in the clockwise or counterclockwise rotation.

Abstract: A machine tool which operates with a hydropneumatic pressure intensifier whose step piston is braked hydraulically in particular towards the end of its stroke by forcing hydraulic fluid from a braking cavity formed during the stoke via a choke point.

Abstract: A lifter automatically adapts to pick up different style residential refuse collection carts. An upper movable clamp bar cooperates with a finger support bar to grab a smooth-sided cart with a single upper lifting lip. A hinged saddle and hinged sliding hook lifts carts having a pair of opposing engagement surfaces (e.g., bars). Hinged members are automatically pivoted into retracted positions during presentation of smooth sided carts, but are otherwise maintained in place for engaging other type carts. The lifter has a relatively short face plate for size and weight advantages, obtained by alternate extension/retraction of the hinged sliding hook during a lift cycle. Rollers on the extending face plate prevent cart scarring. Adjustment for different height carts is provided by a vertical lift assembly which uses a hydraulic sequencing valve to first raise the lifter for engaging the cart and then to cycle through a dumping process.

Abstract: A device for mounting a cushion plunger to one end of the piston rod in a hydraulic cylinder, the cushion plunger constituting a part of a cushion mechanism installed to dampen the impact generated during the rotation of the piston in the hydraulic cylinder. The mounting device includes a recess provided at the end of the piston rod and adapted to partially receive the cushion plunger, a pin hole provided at the piston rod, the pin hole extending in a direction orthogonal to the recess such that it communicates with the recess, another pin hole perforated throughout the cushion plunger radially of the cushion plunger, the pin holes being aligned with each other at a state that the cushion plunger is received in position in the recess, a fling pin inserted into the pin holes being aligned with each other, the fling pin being adapted to fix the cushion plunger to the piston rod, and a clearance defined between the outer diameter of the fixing pin and the inner diameter of the pin hole of the cushion plunger.

Abstract: A decelerating air circuit having an air cylinder is disclosed. The decelerating air circuit includes a driving solenoid valve having an advance mode and a withdrawal mode. A decelerating solenoid valve having a high speed mode and a low speed mode has an outlet port connected to the decelerating solenoid valve. A constant speed flow control valve is attached to a low speed port of the decelerating solenoid valve. Limit switches are located respectively at an advance end and a withdrawal end of a piston rod of the air cylinder. Decelerating sensors are located respectively between the limit switches. The piston rod advances past a point of a decelerating sensor, triggers the sensor, and causes the decelerating solenoid valve's operating mode to change from a high speed mode to a low speed mode. The change in mode is accomplished by outgoing air being introduced so that it passes through the flow control valve thereby reducing the speed of the piston rod.

Abstract: A hydraulic cylinder provided in its piston with axial channels with check valves permitting fluid flow in one direction from one cylinder chamber to the other. Constricting means in the form of a spring-biased plate displaceably mounted on the piston rod covers, after a certain displacement of the piston, a portion of the outlet openings of the axial channels to reduce the flow-through cross-sectional area and brake the piston movement.

Abstract: A hydraulic cylinder snubbing arrangement includes a pilot operated control valve having a predetermined snubbing position at which flow exhausted from a hydraulic cylinder actuating chamber must pass through a plurality of flow restricting orifices in a valve spool when the hydraulic cylinder is retracted to a predetermined position. The valve spool is shifted to the snubbing position automatically by reducing the fluid pressure in a pilot chamber at the end of the valve spool to a predetermined level so that a snubber spring device resiliently moves the spool from a lower or float position. By forcing the fluid to pass through the restricted flow path created by the orifices, the gravity induced velocity of the hydraulic cylinder is greatly reduced as the hydraulic cylinder approaches its end of stroke position.

Abstract: A rodless cylinder with a speed control mechanism comprising a cylinder tube, a hollow cushion ring located at an end of the cylinder tube and adapted to be inserted in a hollow portion of a piston, and a sine function groove formed in the outer surface of the cushion ring, wherein the axial position of said cushion ring is capable of being regulated from the outside of the rodless cylinder, so that the time and magnitude of acceleration and deceleration of the piston can be regulated, as desired.

Abstract: A control apparatus for an electroviscous fluid has a pair of electrodes between which the electroviscous fluid is disposed and a control device for applying nearly-trapezoidal shaped pulses positive and negative voltages alternately across the electrodes to control viscosity of the electroviscous fluid. The control apparatus changes gradually a voltage value when switching between the positive voltage and the negative voltage.

Abstract: A linear hydraulic motor including a first piston rod (12) and piston head (16), a second piston rod (18) and piston head (26), and a cylinder housing (30), having a divider wall (46), adapted to reciprocate longitudinally on the piston heads (16, 26). The cylinder housing (30) has end members (34, 36) through which piston rods (12, 18) extend. Four fluid chambers (52, 54, 56, 58) are formed within the linear hydraulic motor. Fluid chambers (52, 56) communicate with each other through conduits (62), and fluid chambers (54, 58) communicate with each other through conduit (64). Piston rods (12, 18) include conduits (68, 70) for fluid communication with chambers (54, 56). A snubber (74) is provided in the divider wall (46) of the cylinder housing (30). The snubber (74) reciprocates within the divider wall (46) and is adapted to abut the inner ends of the piston rods (12, 18) as the divider wall (46) approaches piston heads (16, 26) during the reciprocating process.

Abstract: A lifter automatically adapts to pick up different style residential refuse collection carts. An upper movable clamp bar cooperates with a finger support bar to grab a smooth-sided cart with a single upper lifting lip. A hinged saddle and hinged sliding hook lifts carts having a pair of opposing engagement surfaces (e.g., bars). Hinged members are automatically pivoted into retracted positions during presentation of smooth sided carts, but are otherwise maintained in place for engaging other type carts. The lifter has a relatively short face plate for size and weight advantages, obtained by alternate extension/retraction of the hinged sliding hook during a lift cycle. Rollers on the extending face plate prevent cart scarring. Adjustment for different height carts is provided by a vertical lift assembly which uses a hydraulic sequencing valve to first raise the lifter for engaging the cart and then to cycle through a dumping process.

Abstract: This invention relates to a work cylinder having damping stops for limiting movement of the piston within the cylinder, the cylinder having cylinder covers for closing the ends of the cylinder, whereby the damping stops are positioned and retained substantially between the cylinder covers and the cylinder walls when the cylinder covers are fastened to the cylinder.

Abstract: The invention relates to a variable displacement pump supplying fluid to a number of consumers. The pump control for adjusting the delivery rate is actuated by a signal which is produced by the respective highest loaded consumer. The signal is provided by a valve, in particular a pressure compensating valve which is associated with the consumer, and which valve opens a spool land when the valve becomes positioned at its control end range. A pressure signal from any pressure fluid source is delivered through the land to the pump controller. The control, according to the invention, offers a broad variety of possibilities for arranging the pressure compensation valve at various locations, engaging the valve by a variety of pressure differences, and using a number of pressure fluid sources of provide for the signal pressure to actuate the pump controller.

Abstract: A control system for a fluid operated jack reduces the speed of retraction of a piston rod of the jack to an acceptable rate during a preselected range of operation by adding pressurized fluid flow to the fluid being exhausted from the jack through a restrictor valve to the reservoir. This reduction in speed reduces the potential for damage to the jack and associated componentry without sacrificing efficiency of operation. An implement controller causes fluid flow from a fluid source to be combined with the flow of fluid being exhausted from the jack in response to receiving a position signal from a implement position sensor and subsequent to the implement controller commanding the shifting of a control valve to a position at which fluid flow is passed from the fluid operated jack to the reservoir. The control system is particularly suitable for use on an automatic guided vehicle.

Abstract: An actuator including a cylinder having a longitudinal bore, a piston slidably and sealingly inserted into the cylinder, and a lock mechanism for temporarily locking the piston, the cylinder including a cylinder body having the longitudinal bore, a cylinder formed at a front end of the cylinder body and accommodating the lock mechanism, and a front wall connected to the cylinder head at a position opposite to the front end of the cylinder body and having a hole formed therein, the piston including a piston head slidably and sealingly inserted into the cylinder bore, the piston rod projecting from the piston head and slidably insertable into the hole of the front wall, a key groove formed on the piston rod at a position near the piston head, and a longitudinal hole formed within the piston head and the piston rod, wherein the diameter of the piston rod decreases from a backward position adjacent to the key groove to a forward position spaced from the piston head.

Abstract: A hydraulic ram unit for a transmission of the toroidal-race, rolling-traction type. The ram is connected to the rollers of the transmission so that the position of the ram within its stroke is related to the angular setting of the rollers and so to the transmitted ratio. The ram pistons move within cylinders the inlet and outlet ports of which are located in the cylinder end walls, with the outlet ports axially protruding of the inlet ports. If a piston overshoots its normal stroke it tends first to restrict flow through the outlet port and then to contact and obstruct it, so creating firstly hydraulic and then contact forces to resist further overshoot, without substantially restricting the inlet port. Novel construction for the ram itself, and for the ram cylinders and casing are also described.

Abstract: A push-pull tool for setting multi-piece fasteners includes a piston that is movable back and forth within a cylinder in response to fluid forces on opposite faces of the piston. One of the fluids is an air-oil foam mixture that acts essentially as an incompressible liquid force-transmitter, while being somewhat compressible so as to absorb shock loadings associated with rapid piston movements. A check valve is included in the system to admit atmospheric air into the air-oil foam mixture, to thereby partially compensate for oil leakage that might inadvertently take place across the piston seals.

Abstract: A hydraulic operating apparatus for a circuit interrupter comprises a conversion unit for converting input information from the exterior concerning a speed control pattern into an electrical signal for driving a linear or servo motor according to the closing and interrupting commands, the motor drive signal provided from the converting means being transmitted to the motor such that the displacement of the motor causes the hydraulic control valve apparatus to be operated to switch the fluid passages to selectively drive the hydraulic cylinder in different directions, and that the position during the switching of the hydraulic control valve driven by the motor is made different from the final stop position at its interruption or closed state to provide a throttle effect of a throttle in the hydraulic control valve thereby controlling the speed of the hydraulic cylinder.