Abstract: A garbage truck includes a motor truck having a garbage container provided thereon. The garbage container confines a garbage receiving space and has a top end provided with a garbage inlet opening and a rear side provided with a garbage outlet opening A power-operated hoisting unit is provided on the motor truck adjacent to the garbage container. The hoisting unit is operated so as to move garbage into the garbage container. A power-operated top cover unit is provided on the top end of the garbage container so as to cover the garbage inlet opening. A power-operated side cover unit is provided on the rear side of the garbage container so as to cover the garbage outlet opening. A power-operated push plate unit is movably provided inside the garbage receiving space opposite to the garbage outlet opening. The push plate unit is operated so as to push garbage out of the garbage container through the garbage outlet opening.

Abstract: This invention relates to an assembly of a hydraulic motor and a combined device for immobilization, comprising: a reaction cam; a cylinder-block mounted to rotate with respect to the reaction cam; a first immobilization member fast with the cylinder-block; a second immobilization member fast with the reaction cam and capable of being disposed in a first position, in which the first and second immobilization means are fast with one another, and a second position, in which these first and second immobilization members do not cooperate for their mutual immobilization. The device for adjusting the relative position of the first and second immobilization members comprising a jack comprising a chamber.

Abstract: The present invention discloses a linear unit, especially an apparatus for the machining, transportation and manipulation of workpieces, with a housing and with a carriage which is movable out of the housing and to which a handling appliance or the like for the workpiece can be fixed, wherein the carriage is designed as a box section and is mounted slidably in the housing on an adjustably positioned ball bearing assembly, and a groove fixing a stop member of the carriage with a shock absorber being removable from a path of the stop for cushioning of the carriage.

Abstract: A clamp device drive apparatus for driving a clamp device engaged with a T-shaped groove slidably between a clamping position and an unclamping position, comprises a push-pull chain connected to a clamp device, a vertical housing for containing the chain, guide members for turning a running course of the chain, a sprocket engaged with the chain, and a cylinder drive type motor for driving the sprocket to rotate, and the motor is constituted to drive the sprocket with a double acting fluid cylinder or a pair of single acting fluid cylinder, through ball screw mechanism for converting driving force into driving torque.

Abstract: A hydraulic pump apparatus which is provided with a sleeve member sealingly accommodated in a housing, a cam member driven by a motor and slidably mounted in the sleeve member, a plunger abutting against the cam member, a plunger chamber housed in the sleeve member, a capacity of which varies in accordance with a slide movement of the plunger, a suction passage and an ejection passage formed in the housing, a fluid introducing passage communicating with the suction passage of the housing, a suction valve disposed between the fluid introducing passage and the plunger chamber, an ejection valve disposed between the plunger chamber and the ejection passage of the housing, a hollow engaging member for preventing the plunger from rotating with respect to the housing, the engaging member is disposed at a position bridging the suction passage of the housing and the fluid introducing passage of the sleeve member.

Abstract: A guided cylinder is illustrated wherein a yoke for bridging diagonally opposed guide rods has connection thereto by means of enlarged aligned abutments adjacent upper ends of the guide rods to provide a mounting as well as flats for securely holding guide rods while affixing the yoke and thereafter providing a stable mounting for the yoke.

Abstract: The invention relates to a piston vibrator comprising a case with at least one cylindrical bore (5), at least one air connection (7) taken laterally to the bore (5), and a piston (2) longitudinally displaceable in the bore (5). As a means of making such a vibrator more efficient with a given outside diameter, or as a means of making it more compact and smaller with the same degree of efficiency, the invention proposes that the cylindrical bore (5) should extend asymmetrically to the external wall area (6) of the case, at least at the axial level of the air connection (7).

Abstract: The pneumatic booster of the vacuum type comprises mainly a housing (12) divided into two chambers (7, 8) by a movable wall structure (6), constructed of a substantially radial plate (9) and a flexible diaphragm (10) secured by its outer peripheral edge to the housing (12), and forming a flange (11) in the space between the plate (9) and the housing (12). The plate is centrally integral with a hub structure housing, a distribution valve device and linked to a control member and to a controlled member, each by a swivel connection. The plate (9) has at its outer edge an extension (13) cooperating in a non-leaktight manner with the internal wall of the housing (12) in order to ensure axial guidance of the movable wall (6) inside the housing (12).

Abstract: A fluid operated actuator includes a housing having a longitudinally extending aperture with open ends. First and second end caps are attached to opposite ends of the housing forming a chamber within the housing. A longitudinally reciprocal piston and attached rod are disposed within the chamber with the rod extending externally of the chamber through one of the end caps. The piston is adapted for reciprocal movement from one end limit of travel adjacent the first end cap to a second end limit of travel adjacent the second end cap. At least one of the first and second end caps includes a longitudinal aperture in communication with the chamber and a transverse aperture communicating between the longitudinal aperture and an exterior of the end cap. A sleeve is connected to the rod adjacent the piston and is engageable within the longitudinal aperture of the end cap when the piston is in the end limit of travel.

Abstract: A new and improved ram locking apparatus for blowout preventer rams which allows the rams to be locked in the closed position and compensates for wear on the sealing elements of the rams. The device consists of a tubular cross containing a rod extension with a tapered end attached to the ram, a hydraulically reciprocal piston with a wedging surface to coact with the tapered end of the rod extensions and hydraulic fluid ports. The tapered end of the rod and the wedge surface of the piston have serrated surfaces to increase friction between the wedging surfaces and provide a self-locking engagement and thereby provide a small compact apparatus.

Abstract: A brake servo booster has a housing (1) divided into two chambers (A, B) by a movable partition (5) which includes a diaphragm (6). A protective boot (14) for a support member (11) extending through the housing is connected to the diaphragm by a carrier member (16) engaged by adjacent portions (14A, 6A) of the boot and diaphragm in a manner which avoids direct contact between these portions and facilitates assembly of the booster.

Abstract: An internal combustion engine is provided having a generally cylindrical piston, a piston ring on the generally cylindrical piston, and a cylinder receiving therein the piston for reciprocation with the piston ring. The piston ring and the cylinder are configured in such a fashion that rotation of the piston ring relative to the cylinder is prevented.

Abstract: Disclosed is a fluid powered linear slide employing either a rodless or rod-type cylinder. The slide includes a base which has a movable carriage mounted thereon which moves reciprocably in response to pressurized fluid being fed to the cylinder. In the embodiment employing a rod-type cylinder, a pair of tubular rods are mounted on the base in a fixed position and attached to a piston stationarily mounted inside the cylinder which is movably mounted and attached to the carriage. In the other embodiment, the carriage is mounted on a bracket which is attached to the rodless cylinder carried in the housing for the cylinder. The base has linear guideways therein, each guideway carrying one or more stop members which are manually adjustable and electrically or fluidly actuated.

Abstract: A piston-cylinder assembly wherein in the cylinder housing there is provided a cylinder chamber extending in axial direction, in which cylinder chamber a piston is movably guided in axial direction. Both the piston and also the cylinder chamber have a cross section which is different from a circular shape. A permanent-magnet piece is arranged fixedly in the area of the outer circumference of the piston. A switch arranged in the area of the linear path of movement of the permanent-magnet piece is provided on the outside on the cylinder housing, which switch can be operated without contact by the magnetic field of the permanent-magnet piece.

Abstract: The invention concerns an improvement to the jack of a hydraulically controlled clutch actuation device. The jack which displaces the clutch release bearing is defined between two respective fixed inner and outer cylindrical surfaces external to the sleeve on which the clutch release bearing slides. The space formed between the chamber of the jack and the sleeve also make it possible to house a preloading spring therein.

Abstract: The invention relates to a linear motor with a cylinder (5) containing a piston linked to a piston rod (8) projecting from either of the end faces of the cylinder (5). To secure the piston rod against torsion and rotation, a guide comprising at least two guide ribs (22, 22') arranged on the circumference of the cylinder (5) is provided, these ribs being arranged at a distance from each other and extending in the axial direction of the cylinder (5). A slide (19) seated on the outside of the cylinder (5) and guided on the guide ribs (22, 22') while at least partially encompassing them is fixed to the piston rod (8).

Abstract: Disclosed is a fluid powered linear slide employing either a rodless or rod-type cylinder. The slide includes a base which has a movable carriage mounted thereon which moves reciprocably in response to pressurized fluid being fed to the cylinder. In the embodiment employing a rod-type cylinder, a pair of tubular rods are mounted on the base in a fixed position and attached to a piston stationarily mounted inside the cylinder which is movably mounted and attached to the carriage. In the other embodiment, the carriage is mounted on a bracket which is attached to the rodless cylinder carried in the housing for the cylinder. The base has linear guideways therein, each guideway carrying one or more stop membes which are manually adjustable and electrically actuated.

Abstract: A yarn false twisting apparatus is disclosed which comprises a pair of rotating circular discs having cooperating friction surfaces for engaging a running yarn at a twisting zone. A pressure applying member is positioned to apply a biasing force to the rear surface of one of the discs locally at the twisting zone, and the pressure applying member comprises a receptacle slideably mounting a piston which extends from the end of the receptacle to engage the disc. The receptacle is eccentrically mounted to permit selective positioning of the biasing force with respect to the yarn path of travel. The discs are mounted on pivotal rocking arms whereby the ratio of yarn twist to yarn speed may be adjusted, and an eccentrically mounted pin provides closely controlled adjustability for the arms and thus the twist ratio.

Abstract: An improved linear guiding mechanism with a standing part and a moving part which have respective uniform cross sections. A pair of spaced guiding channels is formed between these parts and respective linear ball bearings are arranged in both channels that interconnect the two parts. The channel walls are abutting the balls via steel bars extending along the channels. Preferably the standing part defines a cylinder in which a piston is moved and its shaft is connected to the moving part. The parts are made of light and soft material such as aluminum or plastic and manufactured by extrusion technique. The rather high variation of dimensions of such parts are compensated by means of biasing forces that press the channels together, and the biasing forces are sufficiently high to resist operational load. The length of the ball bearings is at least the half of the maximum stroke.

Abstract: A spring brake cylinder assembly in which a pushrod connectable to a brake assembly is extendable from an end of such cylinder housing the piston member. The spring brake cylinder further includes a clutch release mechanism for manually releasing the brake force being applied.

Abstract: A piston pump having a flexible rolling membrane which seals the piston from the cylinder wherein the piston is designed to include an upper portion which is spaced inwardly from the cylinder wall so as to form a cavity which communicates through channels and seals carried by the lower portion of the piston in such a manner that the lower portion of the flexible membrane is depressed between the upper portion of the piston face and the cylinder walls during an intake stroke as the cavity is subjected to a decreased pressure and which decreased pressure is removed from the membrane during a discharge stroke of the piston. In the preferred embodiment, the membrane is secured to the upper surface of the piston by a cup-shaped element which protects the membrane from materials within the cylinder.

Abstract: The invention relates to a piston and cylinder unit in which there are means for precluding twisting of the piston rod in relation to the cylinder. A part of the piston rod outside the cylinder is connected with a support member which surrounds a major part of the circumference of the cylinder in every position of the piston rod. On both sides of the median plane containing the longitudinal axis of the cylinder there are respective support section having sliding and support surfaces. These sliding and support surfaces face in opposite directions about the axis of the cylinder and each run on a flat runner surface, also extending in the length direction of the cylinder, on a base which is not able to turn or otherwise move in relation to the cylinder.

Abstract: The invention relates to an advancing or feed for moving a workpiece on a machine tool. The device comprises a stationarily arranged fluid power cylinder whose piston rod extending through one of the end caps of the cylinder is connected with a load driving member or carriage for carrying the workpiece. The outer face of the cylinder has at least two, generally diametrally opposite guide flats on which two flat bearer faces in the driving member run so as to preclude rotation if the driving member about the cylinder.

Abstract: In a rodless cylinder comprising a series of driving magnets mounted on a piston fitted in a cylinder tube and a series of driven magnets on a driven member sliding along the cylinder tube, piping to convey a hydraulic fluid is simplified as follows. Both ends of the cylinder tube and guide rods extending parallel thereto are fastened to two end plates. Two ports through which the hydraulic fluid is supplied to and discharged from pressure chambers on both sides of the piston in the cylinder tube are provided in one of the end plates. While one of the ports communicates directly with one pressure chamber through the end plate, the other port communicates with the other pressure chamber through one of the guide rods and the other end plate. The driven member sliding along the cylinder tube carries the series of driven magnets and two annular sliding members on both sides thereof in such a manner as to be movable in the direction perpendicular to the axis of the cylinder.

Abstract: The invention relates to a fluid power actuator with a cylinder barrel containing a piston and having end caps through one of which the piston rod extends. The end caps have tie rod openings for the tie rods clamping the end caps together onto the ends of the cylinder barrel. Instead of being used for a tie rod, one of the tie rod openings has a guide rod running through it parallel to the piston rod. The guide rod is joined to the piston rod and moves with it to prevent the piston rod from turning in operation of the actuator. Part of the guide rod is within the opening during the full stroke of the piston.

Abstract: A hydraulic cylinder is disclosed having a hollow cylinder with a closed first end and an open second end. A rod is positioned in the interior of the hollow cylinder and the rod is securely connected to the first end of the cylinder. The rod is positioned in substantially the center of the hollow cylinder and is substantially parallel to the longitudinal axis of the cylinder. The end of the rod that is spaced apart from the first end of the cylinder has an area of enlarged cross-section. A movable piston having a first end and a second end positioned with the first end of the piston being in the interior of the hollow cylinder. The second end of the piston extends from the open end of the hollow cylinder. The first end of the piston defines a slot for receiving the end of the rod having an enlarged cross-section. The slot is disposed to receive the end of the rod having the enlarged cross-section when the slot and the end of the rod are properly aligned.

Abstract: A linear air compressor having a linear electrodynamic motor which is air cooled and has an increased stroke and accordingly increased output. The working piston is provided with and stroke parting on a push-pull spring provides for centering of the plunger of the motor.

Abstract: A linear to rotary actuator is disclosed having a fluid pressure operated diaphragm whose linear movement is translated into rotary movement of an output member by a helical coupling therebetween. The coupling comprises a coupling member that is insert molded in the diaphragm so as to extend therethrough and interlock therewith while preventing fluid from passing from one diaphragm side to the other. The coupling member has a combined guide and anti-rotation portion extending from one side of the diaphragm that slidably engages a stationary guide so as to guide linear movement while preventing rotational movement of the coupling member and further has a helix extending from the other side of the diaphragm which in one embodiment slidably engages in a slot directly in the output member whereby linear movement of the diaphragm forces linear non-rotational movement of the coupling member and thereby rotary movement of the output member.

Abstract: A stone guide for guiding the honing stone of a superfinishing machine. The stone guide receives a honing stone unit which comprises a honing stone and a honing stone holder. The honing stone holder defines a shoulder and a contact surface. The stone guide includes a piston and a piston rod, at one end of which there is disposed a contact surface, and a rapid-clamping device displaceable in the piston rod. The rapid-clamping device includes a further piston, a further piston rod connected to the further piston and a clamping element which defines a shoulder. Both pistons are displaceable by means of a pressure medium such that displacement of the piston effects lowering of the honing stone unit unto a workpiece and the upward movement of the further piston effects engagement of the contact surfaces.

Abstract: A guide housing as a component of a linear actuator is made up of a barrel and two platforms integrally formed thereon and running the length thereof. The transition or join between each platform and the barrel is formed by a constricted part or waist of the guide housing. The outer face of the guide housing is convex over the barrel and concave over the constriction. The outer face of the barrel may have flats with grooves therein. The platforms have longitudinal holes or grooves in which fittings are adjustably mounted for setting and monitoring the stroke of the actuator.

Abstract: A slide-like drive or feed unit comprises a housing with a piston and cylinder actuator therein. A piston rod extends out of the housing and is joined with a guide rod that runs in a guide hole in the housing. The end of the guide rod remote from the connection is used for mechanical connection with a load. The guide rod bears various fittings for controlling the drive unit. The output drive part, consisting of the piston rod and the guide rod, of the drive unit may be designed with an entrained fluid connection point, that is supplied with fluid from a pipe running in a hole in the housing.

Abstract: A yarn false twisting apparatus is disclosed which comprises a pair of rotating circular discs having cooperating friction surfaces for engaging a running yarn at a twisting zone. A pressure applying member is positioned to apply a biasing force to the rear surface of one of the discs locally at the twisting zone, and the pressure applying member comprises a receptacle slideably mounting a piston which extends from the end of the receptacle to engage the disc. The receptacle is eccentrically mounted to permit selective positioning of the biasing force with respect to the yarn path of travel. The discs are mounted on pivotal rocking arms whereby the ratio of yarn twist to yarn speed may be adjusted, and an eccentrically mounted pin provides closely controlled adjustability for the arms and thus the twist ratio.

Abstract: A tire carcass transfer device (111) having a hollow housing (112) for receiving a tire carcass (160), a plurality of flexible cups (21) arranged in a circular band around the housing, vacuum means connected to the cups (21) and fluid powered actuators (10) for radial movement of the cups. The actuators (10) each have a return spring (24) therein to move piston (14) of the actuator (10) radially outwards by a predetermined amount on cessation of operation of the fluid powered actuator. Since all the pistons (14) are moved the same distance outwards by their respective springs (24), distortions to the carcass from its circular shape are minimized. An actuator (10) having a return spring (24) operating on a rod (15) operably connected to a piston (14) to return the actuator piston to a mid stroke position is also described.

Abstract: A friction clutch system includes a constant running release bearing member designed to accommodate axial misalignment. In a preferred form, a wave washer is interposed between a flange of a bearing carrier and the outer race of the release bearing member to provide for axial flexibility. In addition, a mechanical stop is provided to limit axial travel of a thrust ring affixed to the axially moveable bearing member in a direction of clutch disengagement. In a preferred form the stop is formed of an elongated shaft having a radially extending projection for arresting the carrier movement beyond a predetermined limit. A sleeve positioned over the shaft includes markings to permit visual indication of amount of clutch wear to aid in the servicing of the clutch system. Also in a preferred form, the carrier is formed of two resilient non-metallic parts and incorporates a snap fit flange-detent connection system which preloads the wave washer upon assembly of the two carrier parts.

Abstract: A piston-cylinder arrangement, particularly useful for the press shoe of an extended nip press. The cylinder is a fluid pressure cylinder with a piston, which is fluid pressure reciprocated, disposed in the cylinder chamber. The cylinder and piston are polygonal around their peripheries. A circumferential groove in the cylinder wall carries a plurality of sealing pieces which are urged outwardly of the groove and against the periphery of the piston. The sealing pieces comprise corner pieces disposed at the corners of the polygonal cylinder and second sealing pieces joining the corner pieces. Where the corner and second sealing pieces meet around the periphery of the cylinder, they have overlying, overlapping surfaces that are oriented perpendicular to the reciprocation of the piston. A spring in the groove may urge some of the pieces outwardly toward the piston.

Abstract: A nitrogen die piston-cylinder unit has a central post threaded at one end into a nitrogen manifold. The piston has an axial bore therethrough. A sleeve closed at one end is telescoped over the free end of the post and is vertically slideable thereon. The upper end of the post has an annular seal thereon in sliding sealed engagement with the bore of the sleeve. A key and keyway formed on the inside of the sleeve and the outside of the post are arranged to interengage when the sleeve is fully telescoped over the post to prevent relative rotation therebetween. The exposed end face of the sleeve is formed with recesses adapted to be engaged by a spanner wrench to enable the unit to be removed from the threaded port of the manifold when the key is engaged with the keyway.

Abstract: A pressure cylinder with a piston arranged in an inner chamber of a tubular casing has a second, also cylindrical inner chamber parallel to the first inner chamber and in which is slidingly guided an auxiliary piston. An extension of the auxiliary piston and an extension of the first piston in each case pass through the elongated slot in the casing wall, the two extensions of the two pistons being rigidly interconnected, preferably with the aid of a joint plate.

Abstract: The securing disc which is attached to the ends of piston rods located outside the cylinder of a fluid actuation device includes bores therethrough in which the ends of the piston rods can respectively extend, as well as slots which extend to each bore and clamping screws which extend transversely of each slot for closing the slot and fixedly clamping the end of the piston rod in the associated bore.

Abstract: A disc brake includes a rotor, an opposed pair of friction pads each arranged on an opposite side of the rotor, and a caliper which straddles the circumferential periphery of the rotor. The caliper has a pair of leg portions each arranged on an opposite side of the rotor. The caliper is arranged to push one of the friction pads against the rotor by a piston disposed within a cylinder formed in one leg portion and to push the other friction pad against the rotor on the other side with the other leg portion which is arranged to be slidable by a force of reaction to the thrusting action of the piston. A load distribution plate part is formed at the end of the piston which engages the back of the friction pad. This plate part on the piston is arranged to restrict rolling or turning of the piston around its axis by engaging the inner surface of a saddle portion of the caliper straddling the rotor.

Abstract: A vacuum type brake booster device comprising a booster shell, a booster piston accommodated in the booster shell, a piston diaphragm working together with the booster piston for dividing the booster shell into both front and rear working chambers, and tie rods extending through the piston and the diaphragm for connection of the front and rear walls of the booster shell. Circumferential positioning devices are arranged between the booster piston and piston diaphragm and between the piston diaphragm and booster shell, respectively, so that the piston can correctly be adapted to the shell. Accordingly, the booster piston can be operated freely from interference of the tie rods. Furthermore, the piston diaphragm can be prevented from unnecessary forces due to the pressure difference between both the working chambers by the aid of thin-wall portions arranged in the piston diaphragm.

Abstract: A fluid-powered lift unit having a plurality of pistonrods attached to a piston which translates axially but within a tube. The tube is provided with an end cap and a base which in conjunction with the piston defined two fluid-tight regions. The pistonrods extend from the piston and sealingly extend through the end cap thereby preventing piston rotation and causing the lift unit to be rigid with the piston in the extended or contracted position.

Abstract: In order to enable a piston cylinder unit 1,2 with air entry through a hollow shaft 6, to be operated in either mode of operation with a single type of shaft, it is proposed in accordance with the invention to manufacture the shaft 6 in three parts, namely an upper air inlet portion 6a, an intermediate portion 6b which provides access for air to the cylinder via one or more apertures 18, and an operating end portion 6c. These three parts are threaded together and sealed by seals 21 and 24. Captive nuts 3 and 8 are provided at both ends of the cylinder so that the cylinder may be attached to a yoke 4 by either end, with the opposite end carrying a bearing 9 for the air inlet portion 6a of the shaft. If it is desired for the piston to operate in the opposite mode of operation, the portions 6a and 6c are interchanged and the cylinder is attached to the yoke using the captive nuts 8 rather than the nuts 3.

Abstract: Apparatus for controlling the position of a mineral mining machine, such as a plough, guided for movement along a guide comprises inclined piston and cylinder units connected via ball-and-socket joints between connectors at the ends of elongate beams guided on roof supports and brackets on a conveyor forming or supporting the guide. The cylinder of each unit has a ball at its upper end received in a socket on one of the brackets. This upper ball has a stepped profile with a shoulder and an end region of different radii of curvature.The piston and interior of the cylinder are also stepped with innermost regions of reduced diameter. These measures reduce the overall length of the unit.

Abstract: A reduced impact piston assembly including a cylindrical body with a cavity formed therein and having a cross-bore formed therethrough which intersects the cavity. The cross-bore receives a piston pin which has an exposed intermediate portion aligned with the cavity for attachment of a connecting rod thereto. A wide groove is formed about the outer circumference of the cylindrical body which has its center aligned with the center of the cross-bore. Positioned within this groove are a pair of C-shaped inserts, the legs of which abut the ends of the piston pin to prevent axial movement of the pin within the cylindrical body. The C-shaped inserts cooperate with the pin to form a closed loop having a circumferential length which is larger than the circumferential length of the cylinder body. In addition, a portion of each of the C-shaped inserts is in constant contact with a cylinder wall.

Abstract: A hydraulic cylinder including a closed cylinder in which are mounted a rotor for rotation about the axis thereof and two pistons for linear movement, the pistons being respectively sleeved onto two ends of the rotor and bounding a first arcuate fluid tight chamber with the inner surface of the cylinder and the peripheral surface of the rotor. At least one vane member is provided on the rotor for operating with the fluid to produce a rotational output. At least one piston rod is connected to one end of the rotor and mounted to the closed end of the cylinder in fluid tight relationship. On both sides of the first fluid tight chamber are two second fluid tight chambers bounded respectively by two pistons associated with the inner surfaces of the cylinder and the closed ends.

Abstract: A pair of actuatable gripping jaws are secured to a mounting head which is slidably mounted on a support by a pair of guides. The mounting head is of unitary construction and includes a fluid operated motor integral therewith for actuating the jaws at any point along the stroke of the mounting head. One of the guides is defined by the drive shaft of a fluid operated piston and cylinder which reciprocably drives the mounting head. A rigid fluid conduit coupled with the mounting head for supplying fluid to the motor defines the other guide.

Abstract: In a piston-cylinder device, a guide ring (11) that is provided with helical flutings (12, 26) is arranged between the piston (25) and the cylinder (2). This guide ring (11) has an inner fluting (12). With this it engages an outer fluting (26) on the piston (25). The outer ring surface (13) is smooth. It is provided with full length grooves (15) in order to conduct the pressure medium beneath the lifting piston. The piston (25) is fluted (26) only on one portion of its outer surface. The inclination of this helical fluting (12, 26) amounts to 10.degree.-60.degree.. A rotation-preventing plate (21) holds the piston (25) against rotation. This piston-cylinder device is formed especially for very high and also for eccentric loadings.

Abstract: The two chambers (8, 9) on either side of the movable wall structure forming a piston (7) are each sealingly delimited internally by a first and a second flexible impervious walls (23) which connect the central hub part (11) incorporating the control valve (12) to the central annular end zones (22 ; 24) of the corresponding end walls (2 ; 3) of the housing, the central zones delimited peripherally by said flexible walls being interconnected by at least a passage (39) traversing the central hub part, thus providing in the center of the housing a neutral cylindrical zone (32). In this neutral zone (32) there extend force-transmitting elements (38) which have at their ends fastening means (40), for example with assembly flanges (41, 42), and which slidingly pass through said passages (39) formed in the body of the central hub part (11), thus in no way interfering with the control and fluid actuation system of the servo-motor.

Abstract: A spring-applied, air-released parking/emergency brake is combined with an air-actuated service brake through a friction clutch between the parking/emergency brake piston and a first nut member that is threaded onto a screw rod of the service piston. The screw rod and service piston are connected through another friction clutch. The screw rod is provided with a second nut member that is integral with a thrust rod to which the brake rigging is connected. A friction lock slack adjuster arrangement limits retraction of the thrust rod during brake release in accordance with the desired brake shoe clearance to be maintained. When the thrust rod movement is inhibited by the slack adjuster, the service piston clutch becomes disengaged to permit rotation of the screw rod during the release stroke of the service piston corresponding to overtravel due to shoe wear. Brake shoe clearance is thus maintained constant.

Abstract: A dual area tangent piston is provided that includes two integrally conned pistons of different cross-sectional areas with the pistons being non-concentric and aligned at one side along a common line at a common tangent point of each piston area.