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: In a hydraulic rodless cylinder type actuator, a piston is movable back and forth in a hydraulic cylinder. Housing elements are respectively mounted on the opposite ends of the cylinder. Parallel output shafts are respectively accommodated in the housing elements and protrude therefrom in a fluid-tight condition. The linear movement of the piston is translated into the rotation of the output shafts by flexible inner power transmission elements. Flexible outer power transmission elements are provided on the protruding ends of the output shafts in order to deliver a high output from a high-pressure chamber defined in the cylinder to the outside of the cylinder.

Abstract: A pistonrod-less linear drive, whose housing having a longitudinal slot contains a drive part for longitudinal movement therein. A transmission member linked with the drive part projects right through the longitudinal slot to the outside. Adjacent to the two flanks of the longitudinal slot there is a respective resistance strip which extends in the longitudinal direction of the slot and is secured to the housing. A wiper contact arrangement is provided on the transmission member which simultaneously makes contact with both resistance strips and on longitudinal movement of the transmission member slides along the resistance strips. Connection means are provided to render possible connection of the two resistance strips with a position detecting and evaluating device.

Abstract: A rodless cylinder with a position detector and a brake has a sliding table which is slidably retained on a cylinder tube. A moving member (piston yoke) of the rodless cylinder is secured to the sliding table. A brake unit part is connected to one side of the sliding table, and a sensor part is connected to the other side of the sliding table. A brake plate is disposed to extend through the brake unit part. Both ends of the brake plate are connected to a first and second head covers, respectively, which are provided at both ends of the cylinder tube. A first and second brake shoes are disposed to sandwich the brake plate therebetween. The first brake shoe is subjected to brake spring force. A passage for supplying a pressure fluid is communicated with the other side of the sliding table. Thus, the brake is actuated by allowing the brake spring force, together with a fluid pressure if necessary, to act on the first brake shoe, and the brake is released by the action of a fluid pressure.

Abstract: A rodless cylinder has a linear guide which primarily bears loads F.sub.1, F.sub.2, F.sub.3 applied to a slide table and a table guide which secondarily bears those loads F.sub.1, F.sub.2, F.sub.3. The table guide has a centering function performed by being displaced a small distance in a direction substantially perpendicular to the axis thereof when a load is applied to the slide table.

Abstract: A rodless pressure cylinder (1) has a cylinder housing (2) with a longitudinal slot (6) through it and is closed on each end by a cylinder cap (12). The longitudinal slot (6) is sealed on its inside by an inner sealing strip (7) and as necessary is also covered on its outside by an outer sealing strip (8). The provided sealing strips (7,8) are fastened by special clamping elements (11), in or on the longitudinal slot (6). The cylinder caps (12) are provided on each side with connectors for the feed and discharge of pressure medium. Since the sealing strips (7,8) are fastened by the special clamping elements (11) independent of the caps (12), the cylinder caps (12) can be installed in various positions on the cylinder housing (2). They are constructed rotationally symmetrical for this purpose, which is particularly valid for the pressure medium channels in the interior of the cylinder caps (12).

Abstract: A linear actuator has a cylinder body having a slot defined therein, a slide table, a joint connected substantially perpendicularly to a lower surface of the slide table, a pair of pistons slidably disposed in a through hole defined in the cylinder body and defining respective cylinder chambers in the through hole, for displacing the joint in response to a fluid under pressure supplied to one of the cylinder chambers, a guide projecting from a lower surface of the slide table, a pair of spaced guide blocks projecting from an upper surface of the cylinder body, and a plurality of balls rollingly interposed between the guide and the guide blocks.

Abstract: A load positioning apparatus comprises a rodless cylinder which comprises a piston and a load-mounting table connected together by a coupling device, a feed screw turned and driven by an electric motor, and a pressurized fluid control and supply device. The coupling device mechanically and directly connects the piston and table. The feed screw disposed to pass through the piston in the rodless cylinder is connected to the piston with a screw coupling mechanism.

Abstract: The present invention relates to a drive of the fluid or electric type having a device for controlling an element for transmitting a driving force to a reciprocating or otherwise moveable or displaceable element and an arrangement for damping the driving force at at least one end of the element's travel. The driving force element is at least single-acting, and the drive may also include mechanical shock absorbers and sensors arranged in the area of the ends of travel. In order to achieve an especially soft striking or contact at the end of travel position of the driving force element, the control device includes a counter-pulse module which, via a pre-positioning sensor associated with at least one movement direction, causes a chronologically settable changeover from a previously flowed-through or activated first switching element associated with a first end of travel position to a previously unactivated second switching element associated with a second end of travel position.

Abstract: A linear motion device having an elongated body a carriage moveable in a linear path relative to the body and a bearing positioned between the carriage and body for supporting the carriage for movement along the linear path. The bearing includes a side rail adjustably connected to the body and bearing elements between the carriage and the side rail.

Abstract: A rodless cylinder has adjusting mechanisms, each comprising a gear shaft rotatably mounted in a hole defined in an outer wall of a slide table and having a first gear on an end thereof, an adjustment shaft having a second gear on an end thereof which is held in mesh with the first gear at a predetermined angle, and a rod coupled to an opposite end of the adjustment shaft out of alignment with a central axis of adjustment shaft, with a guide roller being rotatably supported on the rod. When the gear shaft is turned by a screwdriver bit inserted in the hole, the adjustment shaft is turned to displace the guide rod for optimum rolling contact with a rail on a cylinder tube. The rolling contact between the guide rod and the rail can be adjusted from the outer side of the slide table.

Abstract: A rodless cylinder which is capable of minimizing the leak of pressure fluid from a cylinder tube. A slit of an almost trapezoidal section is formed in the cylinder tube in a longitudinal direction thereof, a trapezoidal belt which is fixed to the ends of the cylinder tube at the both ends thereof is fitted into the slit, the trapezoidal belt slidably passes through a piston which is fitted into the cylinder tube, and a piston cup is fitted on the outer periphery of the piston. In addition, ribs are provided between an outer lip of the piston cup which is in abutment against the vicinity of the both sides of the bottom of the trapezoidal belt and an inner lip of the piston cup, and the both side walls of tile slit of the almost trapezoidal section are formed into convexly curved configurations in such a manner that the both side walls of the slit can be connected to the inner peripheral surface of the cylinder tube forming a smooth curve.

Abstract: A linear drive without a piston rod has a guide tube closed on the end faces and with a piston mounted so as to be slidably displaceable therein. The guide tube is provided with a longitudinal slot over its entire length. A web connected to the piston and used for guiding out forces projects through the longitudinal slot. Separate profile elements are provided in the longitudinal slot on its flanks and protect the flanks of the longitudinal slot against damage caused by the web.

Abstract: A linear-drive cylinder actuated by a pull means or by a pressure medium has a cylinder tube, in which a piston is guided axially displaceably. The movement of the piston is guided outward via force-transmission means. The cylinder tube is closed on the end face by means of a closing plug. Both the cylinder tube and the closing plug each have a transverse bore. A fastening means, such as, for example, a holding tube or a bolt, passes through the mutually aligned transverse bores, so that the closing plug is secured axially in the cylinder tube.

Abstract: A rodless piston assembly has a carriage or trolley which is reciprocated on support structure through a band or cable connection between both ends of the rodless piston and the carriage Braking of the assembly is obtained by the use of braking cylinders carried in the carriage acting against a braking surface on the support structure.

Abstract: Disclosed is a rodless cylinder having a cylinder barrel with a slit formed axially therein. A piston is movably housed in the cylinder barrel. A mounting table is disposed movably along the external surface of the cylinder barrel and connected to the piston through the slit. An external actuator is mounted on the mounting table and designed to be driven by a pressure fluid. A passage, through which a pressure fluid can pass, is defined in the cylinder barrel. An inlet is provided in the cylinder barrel so as to introduce the pressure fluid in the passage to the mounting table side. An outlet is provided on the mounting table so as to supply the pressure fluid introduced from the inlet to the external actuator.

Abstract: In a rodless cylinder unit with brake, which comprises a sliding table slidably held on a cylinder tube, brake bands inserted into the sliding table and both ends thereof fixed on both ends of the cylinder tube, and the sliding table provided with a brake for squeezing the brake bands, a slit with open upper end is formed on a side of the rodless cylinder of the cylinder tube, an air supply tube is accommodated in the slit, one end of the air supply tube is connected to the sliding table, and the other end of the air supply tube is connected to an end of the cylinder tube. When the air for brake release is supplied to the brake through the air supply tube, the brake is released, and the sliding table becomes movable. When the sliding table is moved, the air supply tube accommodated in the slit is overlapped or not overlapped with very low friction depending upon the moving direction of the sliding table.

Abstract: A linear-drive device with a housing (1) in which a drive element (3) is fitted in such a way that longitudinal motion is permitted. On the outside of the housing (1) is a longitudinal guide element (16) on which a guide rail (18) is mounted, also in such a way that longitudinal motion is permitted. A lug (14) projecting through a longitudinal slot (13) in the housing (1) connects the drive element (3) with the guide rail (18). In order to prevent the lug (14) being damaged if the drive element (3) strikes one of the end stops, a buffer device (30) acting in the direction of motion is located in the connection between the guide rail (18) and the drive element (3).

Abstract: A linear actuator, adapted especially for picking up and transporting workpieces, comprises a pneumatic, rodless cylinder having a pair of driven elements mounted on opposite sides of its body. The first driven element is directly connected to the piston of the cylinder via a sealed, longitudinal slot formed in the cylinder body and the second driven element is drivably connected to the piston or first driven element by a flexible drive band that passes around rollers mounted at opposite ends of the cylinder body. The driven elements therefore move linearly in opposite directions to one other upon actuation of the rodless cylinder. The second driven element may be fixedly secured to a stationary structure so that, upon actuation of the cylinder, the cylinder body itself and the first element will simultaneously execute linear motion in the same direction whereby the first element, which may have a work piece--gripping device mounted on it, will in effect execute double its normal stroke length.

Abstract: A linear drive without a piston rod, which has a laterally slotted guide tube closed on the end faces and a piston mounted so as to be slidably displaceable therein, is provided with a sealing band and with separate profile elements engaging the sealing band. The sealing band extends from one end of the guide tube along its longitudinal slot to its other end. In order to hold the sealing band in the longitudinal slot, separate profile elements are arranged in the longitudinal slot. The profile elements cause the sealing band to engage the guide tube.

Abstract: Disclosed is an actuator having a frame in which a drive source and a slider displaced under the action of the drive source are held, and an actuator arrangement comprising a plurality of actuators connected to each other by connecting devices. A beam member, which constitutes the frame, has a concave portion defined in a side thereof and the drive source is held in the concave portion. A slider base is held in the concave portion and includes the slider displaced along the concave portion. A cover is used to cover the concave portion defined in the beam member. The beam member has grooves defined in respective outer sides thereof, which have substantially T-shaped cross sections and enable other beam members to be mounted to the beam member. The grooves are defined along the longitudinal direction thereof so as to be substantially identical in structure to one another.

Abstract: The traverse apparatus of the subject invention is provided at the end of the main base 24 with a control box 38 having electromagnetic valves 57, 58, relief valves 59, 60, and manifold 61; and, one or more connectors 54 affixed at one end to sliding base 28 and at the other end to a separate sliding base 70. By these elements, the main body having cylinder 32 is separated from the rail guides 22, 23, the work of replacing a worn cylinder 32 is made easy, conveyance can be expedited, and the head mounting bases for attaching working heads can be increased readily.

Abstract: In a rodless cylinder, a moving member which is moved along a cylinder body is reduced in height for the sake of compactness and stability. A stopper is mounted on a stopper support base, which is also reduced in height to preclude the possibilities of obstructing movement of the moving member, and includes a stopper lock mechanism with an adjusting screw suitable for use with the stopper support base of low height. More specifically, in a rodless cylinder having a stopper support base mounted on top of a cylinder body, the stopper support base is provided with inclined surfaces at the opposite ends thereof symmetrically in face to face relation with downwardly-facing inclined surfaces formed on opposite lateral side portions of the cylinder body, and firmly fastened to the cylinder body by setting bolts and clamp members having inclined surfaces face to face with the inclined surfaces.

Abstract: A rodless cylinder for feeding a workpiece has a cylinder having a cylinder tube with a bore defined therein and a piston reciprocally movably disposed in the bore. The cylinder tube has a slit defined therein and extending longitudinally therealong, the slit communicating between the bore and an exterior space. The slit is closed by a first seal member engaging the piston and a second seal member engaging a slide table. The piston has a separator separating the first and second seal members from each other. The cylinder tube has a pair of slanted first surfaces positioned one on each side of the slit. A pair of slide members is disposed on the slide table and have respective second surfaces engaging the first surfaces, respectively, for guiding the slide table when the piston reciprocally moves in the bore and bearing a load applied to the slide table.

Abstract: A linear drive which has a housing with a longitudinal slot. A drive part able to be longitudinally moved in the housing is connected by the aid of a link part, running in the longitudinal slot, with a guide part, which is guided for motion on a longitudinal guide arranged outside the housing. As a longitudinal guide a rod guide is provided, which has at least one guide rod adjacent to the housing and spaced from it radially. The guide rod is exposed along its guide stroke and has the guide part encircling it. There is therefore the possibility of accurate guiding of the moving unit without being affected by any tendency of the housing to splay outwards. The costs of manufacture are low.

Abstract: A rodless cylinder prevents leakage of fluid through a sealing belt and thus increases the freedom in the design of the edge of its seal lip. The rodless cylinder has a piston and a driven table reciprocating over a cylinder which are connected by a piston yoke through a slit extending along a cylinder bore. A sealing belt to seal the slit in the cylinder has a sealing lip which comes in contact with the wall of the cylinder bore at each end of the inner wall that constitutes a part of the wall of the cylinder bore, a sealing projection near the edge of the sealing lip whose edge comes in contact with the inner wall of the slit, and another seal projection that comes in contact with a sealing seat projecting from the inner wall of the slit.

Abstract: The present invention provides a rodless cylinder capable of displacing a piston without its operation stoppage in particular even when a large load or force is applied, smoothly reciprocating a sliding table and forming its entire structure in a compact manner. The rodless cylinder according to the present invention has a cylinder body and an L-shaped sliding table. A rail-shaped member fitted on a linear guide member of the sliding table is mounted on the upper surface of the cylinder body, which is held against the sliding table, so as to extend along the longitudinal direction of the cylinder body. A plurality of ball bearings are linearly disposed inside the linear guide member held in engagement with the rail-shaped member so as to extend along the longitudinal direction of the linear guide member.

Abstract: In a rodless cylinder having a piston fitted in a cylinder body for reciprocating movement therein, and a moving member to be moved back and forth along the cylinder body in synchronism with the piston, there is provided a piping and wiring lead-out mechanism which permits the orientation in an arbitrary direction of not only the pipes of operating fluid pressure to and from pressure chambers of the cylinder but also of the lead wires of a piston position sensor switch. For these purposes, ports are opened on the lateral side, outer end and lower side of each of end plates provided at the opposite ends of the cylinder body to supply operating fluid pressure separately to a pair of pressure chambers in the cylinder. The ports to one pressure chamber are communicated with each other through passages provided in the end plate and cylinder body, while a groove is provided along an outer surface of the cylinder body for mounting a switch or switches thereon.

Abstract: A rodless piston and cylinder assembly having an improved cable connection between the ends of the piston and the working unit in the form of a band of plastic and coated stainless steel strip. The exterior surface of the band is curvilinear and cooperates with the curvilinear slot shape of piston and cylinder plastic sealing grommets. Braking of the working unit is accomplished by pistons in the carriage acting against the carriage slide.

Abstract: A pressure cylinder in which the piston is hollow and the pressurized fluid is introduced into the hollow of the piston. The cylinder housing includes a core member with supply and exhaust ports. An area between the rear wall of the housing and a rear wall of the piston is exposed to atmospheric pressure at all times, elliminating a need for seals on the outside surface of the piston, and allowing for the piston to be exposed to large transverse forces. Proximity switches are provided in a slot in the upper wall of the cylinder housing to detect the arrival of the piston at its limit positions and a pin secured to the cylinder housing engages a slot in the outer periphery of the piston to guide the forward and rearward movement of the piston within the cylinder. A slot may be provided in the upper wall of the cylinder housing for receipt of a work positioning member secured to the outer periphery of the piston.

Abstract: Disclosed is a braking apparatus for a rod-less cylinder. A transfer member (3) arranged outside a cylinder body (1) is coupled to a piston (2) disposed movably within the cylinder body (1), and moves together with the piston (2). A brake rail (8) is arranged on the outer side surface of the cylinder body (1), extending in parallel to the moving direction of the piston (2). A braking member (16) faces the brake rail (8) in such a manner as to be engageable therewith, and disengageable therefrom, and is moved to a contact position where it engages the brake rail (8), and a release position where it disengages from the brake rail (8) by an operation member (17), to accomplish the braking and unbraking of the transfer member (3).

Abstract: A rodless cylinder includes a cylinder body, a piston, a sliding table, first and second sealing members, and pairs of first and second holding mechanisms. The cylinder body has a bore defined in a cylinder tube whose ends are closed and a slit which extends along the longitudinal direction thereof and enables the bore to communicate with the outside. The piston is reciprocatively moved within the bore. The sliding table is coupled to the piston by a connecting portion extending through the slit and moved according to the reciprocating motion of the piston. The first and second sealing members are brought into engagement with the piston and the sliding table to close the slit. The pairs of first and second holding mechanisms are located on both sides of the bore and mounted to the cylinder body and the sliding table.

Abstract: The rodless cylinder includes at least a cylinder tube and a piston, but it has no piston rod that is indispensable in the conventional cylinders. The article carrier is connected via the piston yoke to the piston and movable with parts and jigs placed thereon as the piston moves along the cylinder. At least one rod is fixed relative to the cylinder tube to extend in parallel with the direction in which the piston and hence the carrier moves. The sensor is provided to be movable along the rod as the piston moves. The sensor has a moving member movable along the rod as the piston moves within the cylinder tube, for detecting a current position of the piston in accordance with relative positional relation between the moving member and the rod. With such arrangements, the rodless cylinder as a whole has a higher rigidity against heavy load, and also the piston can be accurately positioned to stop at a desired position in its stroke.

Abstract: The rodless cylinder includes a cylinder body, a piston, and a slide table connected to the piston. The slide table and the piston are united with each other due to a coupling part which projects through a slit formed in a longitudinal direction of the cylinder body. The slide table includes first and second load transmitters, whereas the cylinder body includes first and second load receivers corresponding to the first and second load transmitters. When a lateral load is applied to the slide table, the load is transmitted via one of the first and second load transmitters to a corresponding one of the first and second load receivers so as to transmit the force in a direction in which the slit of the cylinder body can be widened.

Abstract: A device for the rapid precision positioning of a heavy carriage employs stationary positioning bar, for instance a part of a linear electric motor or a gear rack, and a cooperating moving part of the linear motor or a motor attached to the carriage. The carriage is rapidly and roughly displaced with a further drive which may be constituted by a further gear wheel that cooperates with a gear rack and is driven by a separate motor attached to the carriage. This further drive additionally delivers a certain force for the final positioning in such a way that the play between the gear wheel and the gear rack is eliminated by biasing. Instead of a second gear wheel together with its motor a toothed belt, also driven by a separate motor, a pneumatic cylinder or a linear motor may be used. These are mounted separately from the carriage and ar principally fixed in space.

Abstract: A linear drive apparatus comprises a cylindrical casing having a longitudinal slot. A piston is located in an inner chamber of the apparatus and can be moved in longitudinal direction by differential pressures. This piston includes a projection extending through the longitudinal slot. The outer side and the inner side of the longitudinal slot are sealed off by a sealing strip. An air connector is in communication with the space between the two sealing strips, allowing the production of a vaccum or of an overpressure in the mentioned space.

Abstract: The pressurized medium cylinder has a longitudinally extending slot. The steel strip located for sealing purposes at the inner side of the surface of the cylinder and arrested by means of magnets is equipped with an injection molded plastic encasing, which forms at the outer side of the steel strip a plastic material strip which centers the steel strip relative to the longitudinal slot.

Abstract: A working cylinder which operates without a piston rod, comprising a cylinder tube, a piston which is displaceable therein and is provided with a pulling means, and a force transmission element which is connected with the pulling means and guided in axial displacement on the cylinder tube. In order to minimize the mounting work for the external attachment of the pulling means and at the same time increase the dependability of operation, the pulling means (1) is provided on the ends thereof connected to the force transmission element (2) with clamping pieces (3) which are provided with a toothed surface (5) on at least one outer side (4) and the force transmission element (2) is provided with a correspondingly toothed surface (6) against which the side (4) of the corresponding clamping piece (3) having the toothed surface (5) can be pressed via a pressing element (7). The corresponding toothed surface of the force transmission element (2) is longer than the clamping pieces (3) to allow for adjustment.

Abstract: The braking device (2) is formed between a force collector (3) and a cylinder casing (1) by way of slider tracks (5) and counter slider tracks (6) and by sliding bodies (7) guiding the slider tracks and counter slider tracks in a working cylinder without piston rod. The adjusting elements (12) for the setting of a sliding or a braking play can be set according to the sliding bodies (7). In order to achieve a compact construction, a low construction height, as well as a lowest possible number of parts, the braking device (2) is disposed symmetrically to a slider plane and a casing center longitudinal plane (19), respectively. The braking device is furnished with a force member (20) acting in the region (21). The lever element (22) engages centrally in each case with the lever arms (22a, 22b) on the adjusting element (12). A press-on force generating the braking force centrally engages the lever elements (22).

Abstract: A generally U-shaped guide carriage is linearly guided on a longitudinally-extending rail track by at least one circuit of roller balls carried by each of the depending flanges of the U-shaped guide carriage. Each ball circuit includes a linear load-bearing row and a linear return row of roller balls. The load-bearing balls bear against facing ball rolling tracks carried by the opposite sides of the rail track. A cross member is connected adjacent one end of the rail track and carries rolling track engagement faces for engaging the ball rolling tracks on the rail track. An entraining unit is connected to the guide carriage, and a linear drive is coupled between the cross member and entraining unit for driving the guide carriage along the rail track. In another embodiment, a common steel insert is carried by each depending flange of the U-shaped guide carriage and supports the load-bearing row or rows of the associated ball circuits.

Abstract: A fluid-driven working cylinder without a piston rod is provided with a cylinder housing (4) which in cross-section is fully closed, and along which a force takeaway (1) is guided without turning. The force takeaway (1) is connected with a band (7) that extends respectively from each of the ends of the cylinder housing (4) and is fastened to the piston. The band (7) is externally guided over two reversing wheels. To avoid leaks of the cylinder housing (4) during pressurization the interior of the cylinder housing (4) is divided into a piston space (8), in which the working piston is moved back and forth, and a band space (9), which is separated from piston space (8), but which is connected with the piston space (8) by means of a longitudional slit (10) which is sealed off by a sealing strip (5). Band (7) runs in the band space (9) and is connected to the piston by means of linkage (6) which projects through the longitudinal slit (10).

Abstract: A rodless cylinder and an external yoke which slides thereover are mounted in a relatively rigid generally tubular support that has a guide rail mounted thereon with a bearing slide mounted for sliding movement over the guide rail and the bearing slide has a work performing tool mounted thereon. The bearing slide is coupled to the external yoke for movement therewith and substantially all torques generated by forces on the work performing tool are absorbed by the bearing slide, the guide rail and the relatively rigid generally tubular support.

Abstract: An attachment arrangement for attaching an object (4), for instance a rail, such as a support rail, brake rail, mounting rail or the like, onto a piston-cylinder control device (1), the cylinder of which has two undercut grooves (3) extending along at least one of its sides, these grooves being parallel with one another and therewith also with the cylinder axis. The object (4) is provided with two parallel ridges or keys (5), each of which is intended for locking coaction with a respective undercut groove (3). At least one wedge-shaped, elongated device (6) is arranged between the outside of the cylinder (1) and the object (4), in connection with each pair of coacting grooves (3) and ridges (4). Means (9) are provided for moving the wedge-shaped devices (6) in a direction transversely to the cylinder axis, so that these devices (6), in engagement with oblique surfaces (7) on the cylinder (1) and/or the rail (4), will fixate the rail in a position parallel with the cylinder axis.

Abstract: An apparatus for the threading-in and threading-out of an elastic cover strap in a working cylinder without a piston rod, includes an elongated tubular member (1) having a longitudinal axis; a carriage (21) having a longitudinal axis parallel to the longitudinal axis of the tubular member (1) and mounted on the tubular member for guided movement along the longitudinal axis of the carriage; the tubular member having an elongated recess (7) therein extending along the longitudinal axis of the tubular member, the recess being defined by oppositely facing sides of the tubular member each side having a length defined along the longitudinal axis of the tubular member and a depression (32,33) along the length; an elongated cover strap (8) for covering the recess, the strap having a longitudinal axis, a transverse axis in the plane of the strap, and longitudinal edges sized for mating engagement with the depressions defined in the oppositely facing side walls of the recess (7), and an upper flat surface facing toward

Abstract: The present invention relates to a brake arrangement in linear motion operating devices of the kind which comprises a cylinder (1), a piston which is movable in the cylinder, and a rail (3) which is mounted on the outside of the cylinder (1), parallel with the cylinder axis, and which extends substantially along the whole stroke path of the piston. The rail is configured with slide surfaces (8) on opposite sides thereof, and the arrangement further comprises a slide (14) which is configured with slide shoes (15) and which is guided for linear movement along the slide by the slide surfaces (8), this slide being connected to a dogging element (2) connected to the piston.

Abstract: A guide carriage is guided on a rail track. At the two ends of the rail track, cross-members are mounted. Between the cross-members there extends a drive device. A drive element of the drive device is drivingly connected with the guide carriage. The resultant driving force of the drive device lies outside the longitudinal axis of the rail track. For achieving better acceptance of tilting moments, the guide carriage is guided on the rail track by ball circuits. The rows of supporting balls of the ball circuits bear against rolling tracks, which are formed symmetrically on either side of the longitudinally central plane of the rail track on this track. The force transmission planes of the supporting rows of balls diverge towards the longitudinal plane of symmetry and each make an angle with this plane of approximately 45.degree.. The drive device may, in particular, be mounted laterally of one flange of the U-shaped guide carriage, or above the web of this guide carriage.

Abstract: An operator system for a counterbalanced door includes a rodless fluid cylinder that has a cylinder body and a rodless piston adapted for reciprocation in the cylinder body. A carriage which is adapted for reciprocation externally along the length of the cylinder body is secured to the piston. A link member connects the cylinder carriage to a door or to a torsion bar for the door. A control circuit is provided for controlling the operation of the fluid cylinder and hence the position of the door.

Abstract: A piston rod-free pressure cylinder, in which a force reducer (15) is connected by means of a lateral projection (14) to the working piston (13), has a brake mechanism (19), which acts with a brake lining (27) on the outside of the pressure cylinder (11). Action takes place in such a way that no transverse forces are exerted on the projection (14).

Abstract: A pressure fluid cylinder without a piston rod and of the kind having a slotted cylinder tube (1) and a piston displaceable therein, said piston being connected to a movement transfer device, which extends radially through the slot. The slot is sealed axially on each side of the piston by means of internal and external sealing strips (31,32) consisting of a flexible sealing band (37,38) as well as retention means (44,45) extending into the slot and securing a releasable mechanical engagement with each other or, by friction, with the side walls of the slot.

Abstract: A rod-less cylinder comprises a cylinder having an inner surface, an outer surface, a slit elongating in the longitudinal direction in the outer surface, and being formed by a pair of opposing side surfaces, a side recess on the inner surface, which has a width larger than that of the slit, which extends over two sides of the slit and in the direction of the width of the same, and which have first surfaces intersection the side surfaces of the slit and second surfaces intersecting the first surfaces. The rod-less cylinder further comprises a piston which is able to reciprocate in the cylinder and a sealing member which is detachably fitted in the side recess, and which is able to close the slit. The sealing member has a pair of holding ribs for holding the sealing member in the side recess by its engagement with the second surfaces, and a pair of sealing lips for closing the cylinder and the side groove.