Abstract: A spoiler actuator can be operated by applying high pressure to a first chamber of the actuator on receipt of a command to extend the spoiler; applying high pressure to a second chamber of the actuator on receipt of a command to retract the spoiler; and on failure of a supply of the high pressure actuating an anti-extension valve to prevent extension of the spoiler; disengaging the anti-extension valve to permit extension if pressure applied to the anti-extension valve exceeds a predetermined force of a spring biasing the anti-extension valve to the engaged position, wherein additional force is applied to the anti-extension valve if the spoiler is retracted beyond a neutral position.

Abstract: A single-acting hydraulic cylinder includes a cylinder head provided in the opening of the cylinder tube to allow the piston rod to be inserted, a bushing provided on an inner circumference of the cylinder head to slidably support the piston rod, and a housing recessed portion formed on the inner circumference of the cylinder head to receive the bushing forcibly inserted from the inlet portion. A bottom clearance filled with the grease is formed between the bottom face of the housing recessed portion and the bushing.

Abstract: Disc brake calipers with a piston roll-back device capable of allowing accurate and repeatable roll-back of pistons and which are easy to construct and assemble are provided.

Abstract: A hydraulic actuator system including an actuator and a valve assembly configured for bi-directional regeneration. The actuator may include a hollow body and a rod disposed within and extending outwardly from the hollow body. The rod may include a first chamber within the rod and a piston disposed at one end of the rod, defining a second chamber and a third chamber within the hollow body. A valve assembly may be in fluid communication with a first conduit, a second conduit, the first chamber, the second chamber, and the third chamber, wherein the valve assembly is configured to selectively couple one of the first conduit and the second conduit to one or more of the first port, the second port, and the third port, wherein one of the first conduit and the second conduit is configured as a pressure source.

Abstract: A reciprocating compressor may include a shell, a first cylinder, a plate, a second cylinder, and a piston. The first cylinder may be disposed within the shell and may include a first valve. The plate may be fixed relative to the first cylinder and may include a second valve. The second cylinder may be axially aligned with the first cylinder and may be moveable relative to the first cylinder between first and second positions. The piston may be disposed within the second cylinder and may include a third valve. The piston may reciprocate relative to the first and second cylinders. The piston and the plate may define a first compression chamber therebetween. The piston and the first cylinder may define a second compression chamber therebetween.

Abstract: An air shock absorber includes seal members that maintain the sealing performance and slidability of the seal members. The air shock absorber includes a cylinder and a piston. The cylinder contains gases and is divided by the piston into a high pressure gas chamber and a low pressure gas chamber. A first seal member extends in a circumferential direction of the piston along its outer periphery. A second seal member is located on the outer periphery of the piston closer to the high pressure gas chamber than the first seal member is. A surface of the first seal member includes a groove. A surface of the second seal member faces the surface of the first seal member and includes a groove.

Abstract: An axial piston machine comprises a cylinder drum in which a multiplicity of pistons are arranged in a longitudinally displaceable manner. The pistons are supported, via sliding blocks, on a running surface which is inclined relative to the cylinder drum axis. The sliding blocks are held, at that side thereof which faces away from the running surface, by means of a retraction plate. The retraction plate is produced from processed sheet metal in a non-cutting punching and stamping process.

Abstract: A drive device, comprising a housing, a rod, a limiting device, a sliding block, a rotating block, a pair of springs, a pair of first grooves, and a second groove. The rod passes through the sliding block, an axis is disposed on the sliding block, the rotating block is disposed on the axis, the springs are disposed on both sides of the rotating block, the top of the spring is contacted with one side of the rotating block, the first grooves are disposed on one side of the rod opposite to the housing, the second groove is disposed on inner side of the housing opposite to the first groove, a middle part of the second groove is lower than other parts thereof, one end of the rotating block slides in the second groove, and the other end of the rotating block slides in and between the first grooves.

Abstract: A vehicle transmission having a housing (5) with a region in which a connection plate (7) can be firmly attached. The connection plate includes areas for receiving at least parts of the actuating elements, which actuate the torque-transmitting components, and/or parts of the actuating elements, which actuate a transmission shifting device. At least one required actuating cylinder (3) is formed by a first cylinder part, that is located within the connection plate, and a second cylinder part, that is located within the transmission housing. A stop ring (10), provided in the cylinder (3), is configured in such a way that the sealing contact surfaces of a piston (2), in the transmission housing and/or the connection plate, are formed by a bushing-shaped expansion (10?, 10?) of the stop ring (10).

Abstract: An integrated breakaway cylinder for controlling a boom of a self-propelled sprayer and method for constructing a boom assembly is disclosed in the present application. The integrated breakaway cylinder is constructed from a first stage cylinder and a second stage cylinder. The first stage cylinder is configured in a rod and barrel arrangement. The second stage cylinder is also configured in a rod and barrel arrangement, with the barrel of the first stage cylinder serving as the rod of the second stage cylinder. The first stage cylinder operates to extend and retract a boom. The second stage cylinder operates to absorb shock from inertia or the boom impacting an object. The design of various embodiments of the present invention couples the operation of maneuvering a boom with shock absorption into a single integrated cylinder.

Abstract: A piston/cylinder unit is disclosed. The piston/cylinder unit includes a pressure tube having one end; a piston rod axially movable in the pressure tube, the piston rod extending through the one end of the pressure tube so that a portion of the piston rod is disposed outside the pressure tube; a casing tube attached to the portion of the piston rod, the casing tube at least partially enveloping the pressure tube; and a bush attached to the pressure tube, wherein the bush is disposed between the casing tube and the pressure tube so that the casing tube is axially movable relative to the pressure tube via the bush.

Abstract: The present invention provides a telescopic hoist comprising a series of telescopically arranged tubular sections wherein the tubular sections are made in nitrided steel.

Abstract: A cylinder apparatus includes a cylinder and a rod contractibly extending from the cylinder. A cylindrical protecting cover is secured to the rod to cover the rod and the cylinder. The rod has a plate-shaped head cap secured thereto. The protecting cover is provided with clamp portions that axially clamp the outer peripheral portion of the head cap. The head cap is provided with circumferentially spaced projections projecting toward the cylinder, so that the axial dimension over which the head cap is clamped by the clamp portions is larger than the plate thickness of the head cap.

Abstract: A fluid power linear drive device comprises a housing tube on whose outer periphery an output drive slide can slide linearly. For this purpose on the outer periphery of the housing tube there are two guide face pairs each having two guide faces extending along the housing tube on the outer periphery of the housing and, in the axial is direction of a first transverse axis of the housing tube, opposite each other, which in the direction of a second transverse axis, perpendicular to the first transverse axis, are spaced apart.

Abstract: Linear actuators including coupled elongate members formed of shape memory alloys are provided. Members that lengthen when heated are coupled to members that shorten when heated such that stroke amplification gains are derived from each member. The members may be tubular and may be coaxially arranged for telescopic extension and collapse. Sections of a modular structure such as a space vehicle may be latched and clamped together for assembly or for docking by utilizing linear actuators having shape memory alloys that are actuated thermally.

Abstract: A hydraulic cylinder and associated hydraulic system that includes a sleeve cylinder in mechanical contact with a base and stationary between extended and retracted positions, which defines a second hydraulic fluid chamber. An internal cylinder is retained within the sleeve cylinder, defining a first hydraulic fluid chamber. A piston is employed having a piston rod retained within the sleeve cylinder, and a piston cap retained within the internal cylinder. An inner portion is defined between the piston cap and an interior portion of the internal cylinder. The internal cylinder is adapted to be displaced to the extended position to deliver a first power stroke upon pressurizing the first or second hydraulic chambers with hydraulic fluid. The inner portion is adapted to displace the sleeve and internal cylinder to the retracted position upon being pressurized with hydraulic fluid, to thereby deliver a second power stroke.

Abstract: The invention relates to an actuator for heavy machinery including a cylinder, a piston and a protective sleeve. The cylinder forms a chamber for receiving a fluid, and includes an external flange extending radially and outwardly from the cylinder. The piston is operable to translate axially relative to the cylinder between an open position and a closed position, and includes a first extremity positioned outside the cylinder and a second extremity positioned within the chamber. The second extremity sealingly engages the chamber. The protective sleeve protects the piston in the open position, which is movable with the piston and operable to overlap at least a portion of the cylinder in the closed position. The protective sleeve includes an internal flange extending radially and inwardly from the protective sleeve and is positioned for abutting the external flange when the piston is in the open position. This abutment limits the axial translation of the piston out of the cylinder.

Abstract: A piston-cylinder unit includes a piston rod guided axially in a cylinder, a support disk fixed to the piston rod, a mounting element fixed to the support disk, and a protective sleeve which can be threaded over the mounting element. The protective sleeve has an end wall with an aperture profiled to receive the mounting element therethrough as the protective sleeve is fitted to the support disk, the protective sleeve being rotatable relative to the mounting element when fitted to the support disk, the mounting element having an axial support surface which can be positioned axially above the end wall to retain the protective sleeve.

Abstract: To eliminate necessity for rotating a rotation drive mechanism against frictional resistance originated by a sealing portion of a piston when an output shaft is rotated in a component linear motion and rotary actuator. An inside cylinder tube is concentrically provided in an outside cylinder tube and a piston that is driven by means of fluid pressure is fit into a cylinder chamber having a cylindrical shape formed between both the cylinder tubes in a manner so as to be slidable in an axial direction of the piston. A holder, which is rotatably supported by means of a bearing and which is capable of being rotated by means of rotation drive mechanism, is provided in the inside cylinder tube.

Abstract: The invention relates to a telescopic lifting column. The lifting column comprises a plurality of tube bodies which are arranged concentrically inside one another and are axially movable in each case with respect to each other. Furthermore, the lifting column comprises a hydraulic actuator unit which is arranged in the tube bodies so as to be operating in the axial direction. The hydraulic actuator unit comprises a first hydraulic cylinder-piston unit and a second hydraulic cylinder-piston unit connected with the first, the first cylinder-piston unit being connected to a first end of the telescopic lifting column and the second cylinder-piston unit being connected to a second end of the telescopic lifting column. The first cylinder-piston unit is of the type having a first variable operating chamber and a second variable operating chamber.

Abstract: A bore seal telescopic hoist is formed of a series of telescopically arranged tubular sections each having a circumferential reservoir. A circumferential wiper is lodged in the reservoir and is used to collect debris or dirt which may be present on the inner wall of an adjacent tubular section.

Abstract: A jacket-assembly is sealed to a hydraulic elevator jack to protect the jack from corrosion. The jacket-assembly is preferably manufactured from a non-galvanic, non-corrosive material. The jacket may be manufactured from any non-galvanic, non-corrosive material that is strong enough and flexible enough to be factory-installed on the jack, i.e., installed on the jack at a location other than the location where the jack is to be installed, and survive shipping and installation of the jack. The jacket is preferably hermetically sealed to the jack. The jacket-assembly may contain a bulkhead mounted on the hydraulic elevator jack having an O-ring groove. An O-ring can be used to effect a hermetic seal between the bulkhead and the jacket. The bulkhead may be mounted on the jack with any conventional means. In one embodiment, a moisture sensor may be placed inside the jacket.

Abstract: This invention relates to a linear path slide (10) with a slide (26) which is arranged slidingly movable in a housing (12) along a sliding guide (20) and safe against torsion and with a hydraulic driving gear (40) integrated into the slide (26) for a shifting movement of the slide (26), whereby a working piston of the hydraulic driving gear (40) is configured with at least two stages, whereby each stage of the working piston forms a partial hydraulic driving gear (40′, 40″) of the hydraulic driving gear (40) so that higher actuation forces can thus be realized.

Abstract: The linear path slide (100) with a slide (10) which is arranged with a sliding guide (12) slidingly movable and resistant to torsion in a housing (11) and with a hydraulic driving gear which causes the translation movement of the slide (10) and which has a piston (24) arranged slidingly movable in a cylinder by constituting a hydraulic working space (13), is configured in such a way that the cylinder and the working space (13) are placed in the slide (10), the piston (24) being fixed with respect to the housing (11).

Abstract: A dual linear actuator for allowing a tool to perform multiple actions either simultaneously or independently of one another.

Abstract: A single-chamber self-locking cylinder is described in which the single-chamber is made up of a male half-cylinder and a female half-cylinder that are inserted one into the other in mutually sliding way in axial direction. Two pairs of diametral rods that are angularly offset from each other are provided that operate on said half-cylinders in order to retain them in a predetermined axially centred position under the action of a fluid in pressure that is fed inside said single-chamber. Each one of said pairs of diametral rods is made up of two rods operating onto opposite faces of said half-cylinders and coupled to each other by axial tie rods. One of the two rods is fastened to a stem coupled in axially sliding way to one of the two half-cylinders while the other one is slidingly coupled to another stem that is coupled in axially sliding way to the other one of the two half-cylinders.

Abstract: A mechanical pneumatic piston is comprised of an upper cylindrical section and a lower cylindrical section, wherein each section has four linearly elongated, miter-cut staves, an end sleeve, and a slide-guide ring. The mechanical pneumatic piston is further defined as having an internal upper, central, and lower cavity adjacently aligned and extending axially within the piston.

Abstract: Protective tube for a piston-cylinder assembly of the type including a piston rod located with freedom of axial movement in a cylinder, the rod also having a section which extends outside the cylinder. A retaining element for the protective tube is attached to the piston rod, which retaining element includes a multi-part connecting ring, the parts of which are installed in the radial direction toward the piston rod and are operatively connected to it. The protective tube is connected to the connecting ring parts so that these parts come together to form a connecting ring which is braced at least in the radial direction.

Abstract: According to the present disclosure, a fluid cylinder is provided that is configured to move an object between first and second positions. The fluid cylinder includes a cylinder housing and a shaft configured to move between extended and retracted positions relative to the cylinder housing. Preferably, the fluid cylinder includes a scraper positioned to contact an outer surface of the shaft to remove contaminants therefrom during movement of the shaft. Furthermore, the preferred fluid cylinder includes an anti-rotation mechanism positioned to prevent rotation of the shaft.

Abstract: An air compressor capable of being mounted across a lifting jack is disclosed. The air compresssor outer housing has a lower section that has a inverted “u” shape cavity to be mounted across the two vertical side plates of the lifting jack to be combined into a single unit. Therefore the air compressor can be stored, transported or operated. Within the outer housing of the air compressor, on each side face there is a cavity with a cover for opening and closing. These cavities create storage for the power-cord and hose/connector when not in use. The top surface inside the inverted “u” section is formed with a sloping angle approximately matching the sloping top edge of the two vertical plates. This allows the air compressor to be clamped in an approximate horizontal inclination for easier operation.

Abstract: A combination of an outer casing and a hydraulic cylinder includes a tubular and transparent tube which has two open ends and the hydraulic cylinder is received in the outer casing. A fitting and a piston rod on two ends of the hydraulic cylinder respectively extend from the two open ends of the outer casing.

Abstract: A jacket-assembly is sealed to a hydraulic elevator jack to protect the jack from corrosion. The jacket-assembly is preferably manufactured from a non-galvanic, non-corrosive material, such as high density polyethylene tubing. The jacket may be manufactured from any non-galvanic, non-corrosive material that is strong enough and flexible enough to be factory-installed on the jack. The jacket is preferably hermetically sealed to the jack. The jacket-assembly may contain a bulkhead mounted on the hydraulic elevator jack having an O-ring groove. An O-ring can be used to effect a hermetic seal between the bulkhead and the jacket. The bulkhead may be mounted on the jack with any conventional means, such as a weld. In one embodiment, a moisture sensor may be placed inside the jacket.

Abstract: Protective tube for a piston-cylinder assembly of the type including a piston rod located with freedom of axial movement in a cylinder, the rod also having a section which extends outside the cylinder. A retaining element for the protective tube is attached to the piston rod, which retaining element includes a multi-part connecting ring, the parts of which are installed in the radial direction toward the piston rod and are operatively connected to it. The protective tube is connected to the connecting ring parts so that these parts come together to form a connecting ring which is braced at least in the radial direction.

Abstract: A hydraulic drive cylinder with a cylinder tube, which at its respective ends has a cylinder base and a cylinder head, thus delimiting a cylinder space. A piston can move to and fro in the cylinder space between the cylinder base and the cylinder head, which piston delimits a head-side chamber and a base-side chamber, which chambers are sealed off from one another by the piston. The piston rod has a free end which is delimited by an end face, which end face is situated in the head-side chamber. At the said free end, the piston rod is provided with a first stop.

Abstract: A rotation-preventing mechanism for regulating the free rotation of an outer piston in a boosting cylinder apparatus is composed of at least one engaged groove formed in the inner surface of a cylinder tube integrally with the cylinder hole and at least one engaging member that is mounted on the outer circumference of the outer piston and fitted in the engaged groove in such a way as to be moved along the engaged groove.

Abstract: A seismic vibrator system for imparting compressional and shear wave vibrations into the earth has an earth contacting base with a vertical post. A tubular hub is slidably received on the post in a piston/cylinder relationship. Spaced apart horizontal top and bottom plates are secured to the hub. A mass is slidably supported between the plates. Pistons interconnect the hub and the mass. Hydraulic energy is used to reciprocate the mass vertically on the post and horizontally between the plates.

Abstract: A height-adjustable column has a stationary tube that receives a height-changing mechanism, such as a pneumatic spring having a cylinder and a rod that are axially movable with respect to one another. A transmitting mechanism includes a movable member that is operatively associated with the rod and is movable in a direction opposite to the direction of movement of the cylinder upon extension of the pneumatic spring when the pneumatic spring is in a predetermined lift zone.

Abstract: A telescoping hydraulic hoist formed from a non-corrosive material provides bearings and hydraulic seals about the bottom portion of each intermediate moving stage. The bearings and hydraulic seals are thus always maintained within the hoist and are not exposed to dust or particulate matter from outside the hoist. Air flows into and out of the air spaces between adjacent stages through air breathers. The hoist may also include variable length stroke limiters, and a cushion member which partially closes off the hydraulic inlet as the innermost stage is fully retracted to slow the hoist motion in the final stages of retraction.

Abstract: A sorting mechanism for use in apparatus for sorting debris, unripe and ripe comestibles including a paddle and a drive cylinder for moving a bearing supported shaft which drives the paddle and a skirt for protecting the bearing.

Abstract: A hydraulic pressure generator having a body (1) with a first bore (11) therein for receiving a cylinder (21) of a piston assembly (2) to define a pressure chamber (12). The cylinder (21) has a second bore (211) for receiving an auxiliary piston (22) which defines a variable volume compensation chamber (23). The compensation chamber encloses a deformable member (5) which is adapted to exert an elastic force between the auxiliary piston (22) and a closed end (210) of cylinder (21). The compensation chamber (23) communicates with the pressure chamber (12) through a restriction (221) formed in a longitudinal duct (222) of the auxiliary piston (22). A sealing member (4) borne by a portion (222) of the auxiliary piston (22) closes the pressure chamber (12) such that the elastomeric member (5) dampens pressure differences between the pressure chamber (12) and compensation chamber (23).

Abstract: The invention concerns a fluid pressure ram having a fixed cylindrical control chamber defined radially by inner and outer partitions, in which one axial end of the chamber is closed off by a piston which has a cylindrical housing and in which, in the retracted position of the piston, the inner partition of the chamber is received in the housing. The piston, in the protruding position, is fully disengaged axially from the fixed chamber. Two cylindrical shells provided axially in line with the chamber are provided when the piston is in the retracted position. The shells are able to slide axially with respect to the piston and with respect to the chamber so as to define, in the protruding position of the piston, an intermediate annular chamber which axially extends the fixed chamber and which is closed axially by the piston.

Abstract: A brake cylinder means (1) for a motor vehicle, comprises a cylinder/piston means (2) adapted to be operated by a brake pedal means for generating pressure in a hydraulic brake system of the motor vehicle, characterized in that the cylinder/piston means (2) is provided in an outer cylinder means (3) in an axially movable manner, a spring means is provided to resiliantly bias said cylinder/piston means (2) against said outer cylinder (3), in an normal actuation position said cylinder (2a) of said cylinder/piston means (2) being essentially non-movable with respect to the piston (2b) of said cylinder/piston means (2), such that the cylinder/piston means (2) being movable against the spring forces of said spring means (4) in said outer cylinder (3).

Abstract: The wire lock is provided for holding a stop ring on the outer surface of a cylinder. The stop ring includes a counterbore at one end thereof. The counterbore is positioned above an annular groove in the outer circumference of the cylinder. The wire lock is inserted into the registered counterbore and annular groove so as to prevent the stop ring from moving axially on the outer surface of the cylinder. The wire lock is accessible and visible from one axial end of the stop ring.

Abstract: A self-bleeding multi-stage or single-stage hydraulic cylinder system is disclosed which automatically bleeds entrapped air from within the cylinder each time the cylinder is cycled. The self-bleeding structure preferably includes a fixed elongated tube mounted to the base plate of the cylinder, and an axially moveable elongated tube telescopically mounted on the fixed tube. A biasing compression spring forces the moveable tube upward to a predetermined extent when the cylinder is extended. Upon contraction of the cylinder, air trapped therein is purged or bled from the cylinder through the top end of the axially moveable elongated tube into a fluid reservoir. In the final stage of contraction of the cylinder, hydraulic fluid is forced through the fixed and moveable elongated tubes thereby forcing the remaining air trapped therein out of the cylinder and into the hydraulic fluid reservoir.

Abstract: A cylinder device which is capable of restraining the total length thereof to a shorter length even when the stroke is made longer, and which thereby provides the compact appearance and layout of, for example, a machine tool, in which the cylinder device is used. The cylinder device includes a first cylinder provided with an extensible piston rod. The piston rod is constituted as a cylinder tube of a second cylinder. The extensible piston rod of the second cylinder is formed in the interior thereof with a flow path for guiding a working fluid into a cylinder chamber of the second cylinder constituted by the piston rod of the first cylinder.

Abstract: An upstanding telescopic cylinder including piston and cylinder sections is provided and the piston and cylinder sections include large, inner and outer relatively telescopingly engaged guide sleeves with the cylinder guide sleeve disposed outermost. The piston section includes small and large diameter guide discs slidably mounted thereon with the small diameter disc lowermost and the piston sleeve includes longitudinally spaced sets of circumferentially spaced notched abutments which successively engage and elevate the large and small diameter discs during extension of the piston section.

Abstract: A hydraulic piston and cylinder assembly is provided with an outer sleeve attached to the piston rod. The outer wall of the cylinder has a smooth wall with a circular cross section concentric with the inner bore of the cylinder. The outer sleeve has a smooth inner bore with a circular cross section concentric with the cylinder. The outer sleeve is arranged to slide along the outer wall of the cylinder to provide a sliding linear bearing that resists lateral loads that would otherwise be taken up by the piston and piston rod at their contacts with the cylinder. The sleeve distributes the lateral load over a greater surface area and supports the forces with a stronger structure than conventional assemblies. The sleeve, cylinder and piston have concentric circular cross sections to permit rotation about the central axis without binding. The sleeve has a lubricous plastic lining to enhance sliding contact with the outer wall of the cylinder.

Abstract: An actuator includes an elastic member extensible in axial directions when a pressurized fluid is supplied into the elastic member, and guiding device arranged outwardly of the elastic member and permitting the elastic member to move in the axial directions, but restraining the elastic member from moving in directions intersecting the axial directions. As the actuator is of an air-bag type so that energy of the pressurized fluid can be converted into mechanical movement with high efficiency. The actuator moves only in axial directions without expanding in radial directions, so that the actuator takes up little space in operation.

Abstract: A brake motor subassembly comprises a control piston (10) having an internal cavity delimited by a base wall (18) and, at the periphery, by a stepped bore (20, 22, 24) and having a mechanical actuating device acting on the control piston via an automatic compensation device formed by a screw-nut device (34) stressed towards the base wall, via a washer (26) and an axial thrust ball bearing (32), by a resilient member (28) supported on a ring (30) fixed at the end of the control piston axially opposite the base wall, and a pilot piston (44) having a first cylindrical peripheral surface of larger diameter (46) sealingly slideably cooperating with an end of reduced diameter (20) of the stepped bore and, in the vicinity of its end (50) axially opposite to the first peripheral surface (46) and cooperating with the washer (26), a second peripheral surface of reduced diameter (54) sealingly slideably cooperating with an annular seal (38) associated with a retaining washer (40) resting axially against a shoulder (42)

Abstract: A telescopic brake piston includes a cylindrical housing and a pair of concentric pistons. A first hydraulic cavity is provided between an outer piston and the housing, while a second hydraulic cavity, communicating with a source requesting the application of brake force, communicates with both pistons. Passages in the outer piston allow the two cavities to communicate with each other. As the associated brake disc stack wears, the outer piston progressively extends from the housing as the passages are exposed by the inner piston. The actual brake force is attained by the inner piston alone.