Abstract: A cylinder guide mechanism includes a floating bush, a holding part that holds the floating bush, and a linear guide. When a working fluid is supplied in a tube and a piston rod moves back and forth, the floating bush and a guide member of the linear guide move back and forth in the same direction. At this time, a slider of the linear guide is displaced relative to the guide member by retaining the same position. The slider is connected to the tube via an L-bracket.

Abstract: A bleed system for venting pressurized gas at a selectively adjustable flow rate. The bleed system includes a plurality of bleed flow paths of different lengths providing varying resistance to the flow of air and a bleed path selector mechanism movable between a plurality of different settings corresponding with the different flow paths. The flow paths are defined by channels formed in a face of a plate and are connectable in series. The bleed system is applied in a runaway control for an air motor which shuts off the motor when its speed exceeds a predetermined cut-off speed. Selection of a different bleed flow path adjusts the cut-off speed.

Abstract: A lock mechanism of a cylinder includes a lock member for locking or unlocking a piston rod by actions of air pressure and a spring force, a third pressure chamber for causing air pressure to act on the lock member, and a third port. In a pneumatic circuit, a check valve and a throttle valve are connected in parallel in each of first and second pipes connecting first and second ports of the cylinder and a solenoid valve and a check valve and a throttle valve are connected in parallel in a third pipe connecting the third port and the first pipe or the second pipe.

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: 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 at ports and, 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 are provided at an outer peripheral face of the piston to cause compressed air in pressure chambers of the actuator to be discharged from the exhaust hole through the flow rate restricting mechanism.

Abstract: A cylinder with a speed control mechanism wherein in a transfer stroke, a piston is smoothly accelerated or smoothly decelerated at an initiation or termination end of the stroke by controlling the speed of the piston, whereas in a return stroke, the speed of the piston is not controlled, thereby reducing the time required for the return stroke. A bypass passage bypassing longitudinal grooves for flow control provided on a cushion ring (74) is formed in a passage which provides communication between the outside and a main passage or a cylinder chamber (71, 72). A check valve (78A, 78B) is disposed in the bypass passage to allow a fluid to flow through the bypass passage only during the return stroke of the piston (6).

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: An apparatus for cushioning a body of a dump vehicle when the body is lowered, including structure defining a fluid passageway between first and second end portions of the structure. The structure is adapted to be disposed in a fluid pressure operated actuator used to raise and lower a body of a dump vehicle. When the structure is disposed in such actuator the passageway extends in a longitudinal direction of such actuator and the second end portion communicates with an interior of such actuator. A cushioning spool is adapted to be connected to such actuator for moving in the longitudinal direction into the passageway. A poppet includes an orifice that receives the spool for enabling the poppet to be slidably movable on the spool in the longitudinal direction.

Abstract: Snubbers are useful in dampening inertia loads at the end of stroke movement of a hydraulic motor. Known snubbers usually have a spear type annular orifice with an associated plunger which usually restrict fluid flow in the non-snubbing mode thereby slowing response in the opposite direction. The subject snubber includes a snubber stem which is moved to contact the end of a tubular hydraulic cylinder so that all fluid from an actuating chamber must pass through a circular orifice which will build up pressure in the actuating chamber to provide a dampening effect on a piston rod assembly. When fluid is directed into the actuating chamber the snubber stem will move away from the end of the tubular hydraulic cylinder to allow free flow into the actuating chamber to provide quick response for extension of the piston rod assembly.

Abstract: A check valve (10) for a hydraulic actuator (14), wherein the check valve (10) includes a valve seat (72) and a displaceable valve component (62) for controlling the flow of hydraulic oil through valve seat (72). Check valve (10) also includes a cylindrical body portion (50) and a cap (54). A slot (70) is formed in the sidewall of the cylinder (22) of the hydraulic actuator. A valve stem (66) of valve component (62) extends through slot (70) into the working chambers of cylinder (22) and into the path of movement of piston (16). Springs (80, 94) bias valve component (62) into its seated position. Engagement of piston (16) with the lower end (90) of valve stem (66) pivots valve component (62) and unseats the plug member of the valve to allow fluid communication between the working chambers of cylinder (22) and passageway (56).

Abstract: In a device for stroke end cushioning and speed regulating the movement of a piston (3) in a fluid pressure cylinder (1,2) a common adjusting means (9) is arranged for simultaneous setting of the throttle means (7,8) for regulating the stroke end cushioning as well as the piston speed, for the purpose of avoiding very time consuming adjustment. In connection with the setting of the adjusting means (9) the ratio between the flow areas of the respective throttle means is held within the range of 10-60%. In the most uncomplicated embodiment the common adjusting means (9) may be comprised by a screw being fixed to the valve bodies of the respective throttle means.

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 the hydraulic operating circuit associated with a vehicle lifting device in which the circuit is provided with pressure fluid control valves and flow sensors which are operative on the vehicle lowering cycle to establish substantial evenness of the lowering mechanism and protection against malfunction of an operating component to arrest the travel of the vehicle lifting device in its lowering cycle.

Abstract: A rodless cylinder consisting of a cylinder, a piston within the cylinder for reciprocal movement therein, a guide along the outside of the cylinder, a drive block mechanism constrained to move along the guide, a pulley at each end of the cylinder and guide, a cable extending from each end of the cylinder, around a respective pulley and secured to a respective end of the drive block mechanism, a compressible resilient member extending from each end of the piston and, a sealing member co-operable with a valve seat located within an exit from each end of the cylinder, such that when the piston approaches one end of the cylinder, the resilient member forces the sealing member into sealing contact with the valve seat so preventing egress of fluid from one end of the piston to the outside of the respective end of the cylinder. The pulleys, cables and cylinder are also completely enclosed so that only the top of the drive block is exposed to the outside environment.

Abstract: A cushioning device for decelerating and stopping the piston in a hydraulic cylinder by restricting and throttling the fluid flow from the cylinder.

Abstract: The piston of a fluid ram is provided with an end of stroke braking means comprisng a pusher adapted to contact the end wall of the ram cylinder as the piston approaches the end wall to restrict the flow of fluid from the outlet chamber of the ram to an outlet part. As the ram moves nearer the end the pusher opens a valve in the piston to connect the inlet chamber of the ram to the outlet part.