Abstract: An apparatus for removing rubber stator material from inside a housing includes a head, at least one blade, and an actuator. For example, the apparatus can be used to core out rubber material from the housing so new material can be molded therein. Also, the apparatus can be used to cut back excess rubber material newly molded in the housing. The head is rotated about an axis and is moved along the axis relative to the housing. The at least one blade is pivotably connected to the head and removes the rubber stator material at least partially from inside the housing with the rotation and movement of the head through the housing. The actuator is associated with the at least one blade and is operable to adjust a pivot of the at least one blade relative to the head.

Abstract: Cushion holes are provided in cover members, tubular cushion rings are provided on a piston and a piston rod so as to be insertable into and withdrawable from the cushion holes as the piston moves, cushion packings capable of slidably contacting the outer circumference of the cushion rings are mounted to be movable in an axial direction, in mounting grooves formed on inner walls of the cover members constituting the cushion holes, the cushion packings each include a plurality of protrusions extending from the outer circumferential surface to the side surface near the piston and disposed circumferentially alongside one another, and cushioning grooves that extend in parallel with the axis of the cushion rings and whose cross-sectional area changes are formed on the outer circumferential surface of the cushion rings.

Abstract: A hydraulic actuator includes a piston and a cylinder. The piston is axially movable within the cylinder. A stroke end damping valve is provided in a hydraulic fluid flow passage of the actuator and adjacent an end of the cylinder. The stroke end damping valve comprises a damping orifice and a valve element for selectively varying the area of the damping orifice and thereby changing the damping provided by the orifice. The valve element projects from a wall of the cylinder into the cylinder and is engageable by the piston as the piston moves towards the end of the cylinder. This reduces the area of the damping orifice and thereby increases the damping effect on the piston towards the end of its stroke in the cylinder.

Abstract: A fluid pressure cylinder which has a head cover and a rod cover provided on both ends of a cylinder tube, wherein the head cover and the rod cover are formed by casting such as die-casting. A first connecting channel which recesses in a groove shape in the outward radial direction is formed in the outer-circumferential surface of a first concave section of the head cover. A ring-shaped first holder is pressed into the first concave section, causing the formation of a cross-sectionally rectangular first connecting channel, the opening region of which is sealed. In addition, the first connecting channel connects a cylinder chamber of the cylinder tube and a first cushion chamber of the head cover.

Abstract: A linear actuator provided for moving a load includes an actuator housing having a tube and a housing bottom at one end of the tube and a housing head at another end of the tube. The linear actuator further includes a piston guided longitudinally in the actuator housing, and an actuator rod assembled with the piston and configured to protrude out of the actuator housing in a manner which is guided in the housing head. The linear actuator is configured such that reliability of operation is increased and damage of structural parts is largely avoided. The linear actuator achieves these results by virtue of the fact that there is at least one plastically deformable buffer element which can be supported on the housing head and can be deformed in the case of an impact of the piston. The buffer element is configured to convert kinetic energy into deformation work.

Abstract: A fluid pressure cylinder includes first through fourth stepped portions provided in a multi-stepped manner on a first spigot joint of a head cover, and first through fourth stepped portions provided similarly in a multi-stepped manner on a second spigot joint of a rod cover. A cylinder tube is installed selectively on any one pair of the first through fourth stepped portions. Consequently, by preparing a new cylinder tube that differs in diameter, along with a new piston, and then installing the cylinder tube selectively on any one pair of the first through fourth stepped portions, a fluid pressure cylinder having a different bore diameter is constructed.

Abstract: An actuator for a ram air turbine system includes a piston rod that is cylindrical in shape and centered about a centerline, and stow lock pawls supported by the piston rod and able to move radially. Each of the stow lock pawls has a crown with a crown radius. The actuator further includes a lock bolt extending along the centerline radially within the piston rod and configured to be axially movable within the piston rod between a stowed position and a deployed position. The actuator further includes rollers radially outward from the centerline configured to be guided by the lock bolt and a cylinder having a mating surface with a mating radius. The cylinder is positioned radially outward from the piston rod and configured to be axially movable between the stowed position and the deployed position. A ratio of the crown radius of the stow lock pawls to the mating radius of the cylinder is less than 0.98.

Abstract: A hydraulic lifting apparatus includes a main hydraulic cylinder and main hydraulic circuit operatively connected to the main hydraulic cylinder. First and second spaced apart follower hydraulic cylinders are also provided. A hydraulic lifting system includes first and second lift towers. Each lift tower includes a main hydraulic cylinder, a main hydraulic circuit, and at least one follower hydraulic cylinder. A follower hydraulic circuit is operatively connected to the at least one follower hydraulic cylinder. A lifting beam spans between the first and second lift towers. The main hydraulic cylinder of each tower is positioned along the beam axis.

Abstract: A cylinder comprises a cylinder body, a main cavity body, a piston and a piston rod. Air inlets and air outlets are arranged in each of two opposite ends of the cylinder body. The cylinder is further configured with an anti-collision structure. The anti-collision structure comprises a buffer rod arranged on the piston. The cylinder body defines a receiving hole corresponding to the buffer rod. The receiving hole is configured with a first sealing ring that seals a gap between the buffer rod and the receiving hole. The anti-collision structure has a flexible buffering function and does not generate hard impact. Thus, the cylinder has a low vibration and high stability.

Abstract: The invention concerns a device in an piston cylinder aggregate including a valve element (8) which comprises a valve body (9) for choking the flow in a fluid channel (6) in co-operation with a valve opening (7), wherein the device is arranged in a bore (11) in an end wall (1) of the piston cylinder aggregate and wherein the valve element (8) is provided with a setting means (10) to allow adjustment from the outside of the end wall.

Abstract: A flotation control system for controlling the boom of a tractor or brush cutting machine. Three hydraulic valves operate together and work in conjunction with the existing main valve of the tractor or brush cutting machine to provide flotation control or automatic movement up and down of the boom in response to ground surface variations. The system also allows the amount of weight that the cutter or other attachment exerts against the ground to be increased or decreased. The first valve is a flow control valve or a flow restricting or dividing valve that divides hydraulic flow from the pump of the tractor to the flotation control system. The second valve is a pressure reducing valve that provides the general operation of the flotation control system. The third valve is a directional valve and functions as an on/off for the flotation control system.

Abstract: A rodless pneumatic cylinder includes main exhaust ports defined by the open ends of a pair of fixed tubular members that extend, respectively, into the cylinder body from its opposed ends. The main piston of the rodless cylinder has an axial bore formed in it in which is slidably mounted a small piston that serves mutually to isolate the working chambers of the cylinder. The bore carries seals adjacent to its opposed ends whereby, during motion of the piston, the bore sealingly receives one or other of the tubular members at a predetermined stage during the motion thereby effectively closing the main exhaust port. During further motion of the piston, air can, therefore, exhaust only through a throttled auxiliary exhaust port and such further motion of the piston is thus cushioned. The arrangement provides for a greater extent of cushioning relative to known arrangements in which the working chambers are mutually isolated by a barrier fixedly secured in the bore.

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 telescopic pneumatic hoist has a flexible stationary hollow probe on its base arranged to unseat a check ball in the piston of the lowest intermediate stage when the piston is near the base. When such a condition exists, the probe closely interfits with the piston and has a radial port communicating with the underside of the piston. The probe connects at the bottom with a supply and exhaust passage which also communicates with the underside of the piston via a check valve controlled secondary passage.

Abstract: A cushioning system for a fluid power cylinder includes a first passage for the flow of fluid to and from the space between the piston and end cap closure of the cylinder, and a second passage including a throttling valve for throttling the flow of fluid from the space as the piston approaches the end cap closure to cushion the piston. An O-ring seal is centered in the first passage and relative to a seal actuating sleeve on the piston by a plurality of spaced projections extending outwardly from the O-ring. An improved method of forming the valve seat of the throttling valve is also disclosed, wherein the second passage is deformed to substantially conform to the width and shape of the throttling valve and provide substantially zero clearance between the valve and its valve seat.

Abstract: A rotary actuator having a piston travel adjustment mechanism and a cushioning mechanism associated in a single attached unit, with side porting for fluid pressure, thus having a more compact structure that is lighter in weight and yet completely adjustable.

Abstract: A novel rotary actuator utilizes viscosity of the oil and prevents the oil leakage, without using the sealing member to the vane. The instant device installs the flanges in parallel and fixes the vane therebetween, and sets within the cylinder the rotor keeping the stopper therebetween, not fixing it, and the radial bearings at both sides of the cylinder to support the stopper, whereby a fine clearance is maintained between the flange and the inner wall of the cylinder. The rotor is formed in order of machining into flanges, small diameter portions and a rotary shaft. The vane is formed by cutting the material of doughnut shape into a sector.

Abstract: This invention relates to direct acting rotary actuator cylinders wherein the linear motion of the piston is directly converted to angular motion by a means completely enclosed within the cylinder, which means comprises a slidable partitioning body engaging the circular cylindrical cavity in the cylinder in an air-tight sliding relationship and a circular cylindrical rod coaxially and rotatably disposed in said circular cylindrical cavity having a mid-section with a noncircular cross section of a diametrical dimension greater than the diameter of said circular cylindrical rod.

Abstract: A synthetic plastic cushion seal for an expansible chamber motor usable with either an air or oil pressurized medium, the seal having reduced friction characteristics, being of a concise configuration and utilizing radial and axial channels to facilitate medium flow during pressurization of the associated motor chamber.

Abstract: Helically splined hydraulic actuator provided with hydraulic cushioning and rapid initiation of movement. The actuator is provided with an elongated cylindrical bearing integral with the shaft of the actuator for increasing radial and moment load-carrying capacity of the actuator without increasing its length.

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: An oscillator actuated hydraulic impulse of the type including a spool valve actuated by an alternating signal from an oscillator to switch the hydraulic pressure in a double acting cylinder in order to cause reciprocating motion of a piston which strikes a boring tool. The hydraulic impulse device further includes a means for controlling the transition from the impulse stroke to the return stroke of the piston. In some embodiments, the hydraulic impulse device may further include a means for varying the duration of the impulse stroke and the return stroke of the piston.

Abstract: A damping device in pressurized fluid cylinders, especially in hydraulic cylinders, for end position damping of the piston stroke. The device comprises a closure member connected to the piston and adapted to enter during a damping process into an outlet opening in front of the piston. A ring, serving as a non-return valve, is arranged with an axial play in an annular groove so as to choke the flow of pressurized fluid through the annular passage between the wall defining the outlet opening and the closure member, while permitting a fluid flow in the opposite direction during the return stroke of the piston. According to the invention, the ring has a cross-section permitting at least a radial deformation, and circumferentially distributed by-pass openings located in the region of the inside of the annular groove so as to permit said fluid flow during the return stroke of the piston.

Abstract: A fluid pressure actuator consisting of piston structure reciprocal within a cylinder pressurized through ports at the cylinder ends wherein cushioning means is mounted upon the piston structure controlling the flow of fluid through the ports producing controlled piston deceleration at the termination of its stroke. The port utilizes sealing means in the form of a radially expandable and contractable sealing ring floatably mounted to permit limited radial and axial movement. The seal ring closely engages, in a telescoping manner, the outer cylindrical surface of a valve member mounted upon the piston structure wherein a very accurate and effective seal occurs between the ring and valve member, and bleeding of the cylinder chamber being exhausted can be accurately regulated by predetermined flow control apparatus such as slots, orifices or adjustable needle valves.

Abstract: A piston ring for use in hydraulic cylinder cushions wherein advantage is made of the typical imperfect seal characteristics of a conventional metallic piston ring to effect a cushion exhaust fluid metering action near the piston stroke end; the piston ring then uniquely allowing major fluid bypass in the reverse stroke or input fluid pressure direction for instant, full reverse stroke piston velocity response wherein the invention includes a piston ring having a notched pattern in one ring edge surface, which surface is adjacent a piston ring groove side wall, thereby eliminating the prior art need for added secondary flow circuits to accomplish the same instant out of cushion full piston velocity result.

Abstract: A piston cylinder assembly includes a piston rod reciprocatively mounted within a piston chamber, and a piston fixed to the rod within the chamber. A pair of pots are mounted on opposite ends of the cylinder chamber in fluid communication therewith, each one of the ports having a laterally extending portion adapted to be connected in fluid communication with a source of fluid under pressure and having an axially extending portion opening into the interior of the chamber. A tapered seal is mounted on one of the end portions of the piston for sealing the axial portion of one of the ports to provide a cushioned movement of the piston at the terminal end of its stroke. A sleeve member extends axially within the last-mentioned axial portion of the port and terminates at one of its ends at a position disposed opposite the lateral portion of the port. A bleeding device permits fluid to leave the chamber as the seal engages sealingly the sleeve member so that the terminal portion of the piston stroke is cushioned.

Abstract: A device for accelerating the initial stroke of hydraulic jacks, comprising a cylinder, a piston provided with sealing-rings, said cylinder fluid feed-orifices and orifices for exhausting fluid through a plurality of calibrated ports arranged in rows in the cylinder periphery at both ends thereof, characterized in that at least one piston-ring (S.sub.2, S.sub.4) at one end of piston (P) is mounted in its respective groove (R.sub.1) with a certain amount of axial and lateral clearance, said groove communicating with the bottom of the piston through at least one port (B.sub.1).

Abstract: In a piston/cylinder assembly in which the power strokes of the piston are damped, there is a pressure chamber on one side of the piston and an external pipe which serves for the discharge and supply of pressure medium. A restricted zone is provided in a pipe which connects the external pipe to the pressure chamber for limiting the flow of motive gas therethrough. A return pipe connects the external pipe with the pressure chamber and has a one-way valve which closes the return pipe when the pressure medium is discharged from the pressure chamber and opens it when pressure medium is supplied from the external pipe. A connecting line extends from the external pipe to the pressure chamber, and the piston has a member projecting therefrom engageable in the connecting line when the damping movement begins to close that line.

Abstract: A stroke limiting mechanism is connected with the movable member of a hydraulically operated machine to precisely position the movable member. The flow circuit for the stroke limiting mechanism is connected in such a manner that even if an equipment failure occurs, the movable member will be retained in a pressure-balanced condition, thus creating a fail-safe situation.

Abstract: An improved spring controlled poppet-type cushion for a fluid piston-cylinder device, wherein the cushion is connected to the piston by spring means and aligned with the inlet-exhaust opening at the end of the cylinder. The improved cushion includes retaining structure for holding the spring associated with it in axial alignment with the opening for receipt therein as the piston approaches the end of the cylinder. This permits the piston to move into contact with the wall without interference from the spring. The sealing of the cushion within the opening in the end of the cylinder is effected at a point spaced axially from the piston when the latter is in contact with the end wall to provide an axial spacing between the cushion and piston.

Abstract: A hydraulic actuator comprising a pair of pressure oil chambers each of which has a cushioning port, the two cushioning ports being connected to each other through a cushioning means. The cushioning means includes a pair of cracking valves whose closing pressure is lower than its opening pressure and a pair of restricting means for restricting the flow of a pressure oil provided with regard to said cracking valves. This structure permits an output means for the actuator to be stopped smoothly as a result of fully absorbing the inertial energy that accompanies the output means.

Abstract: A piston-in-cylinder type pneumatic actuator is provided with an automatic cushioning facility to prevent the piston from returning to its fully retracted position at velocities exceeding a predetermined maximum velocity. Integrally-housed in the actuator is a velocity transducer arranged to sense the pressure in a cylinder working volume, which pressure is related to the piston velocity and is used to control the operation of an exhaust valve operable to vary the rate of flow of gas from the cylinder thereby to vary the rate of return of the piston.