Abstract: A double-action hydraulic cylinder (3) is provided with an axially slidable piston between a front cover and a rear cover, whereby the piston may be coupled to an extreme load through a piston rod (4) and whereby the piston may be biased via connections (5) for a hydraulic medium at both sides with the hydraulic medium from an extreme pressure source. The connections (5) are attached to the cylinder barrel (6) by means of soldered joints to achieve a good surface finish and thereby also an optically appealing appearance together with a reliable mounting of the pressure connections.

Abstract: In a control arrangement for a working cylinder (1), which may be actuated by a pressure medium, there are provided two separate adjustable regulating valves (4, 5) for both sides of the cylinders, each connected with a pressure medium outlet (t) on one side and with the working cylinder (1) on the other side. The adjustment elements (4′, 5′) of the two regulating valves (4, 5) are housed in a common valve housing (31) for simplification of production, connection, assembly and maintenance; whereby the valve housing is provided with pressure medium connections for both cylinder sides that are to be controlled and with the corresponding conduits.

Abstract: An actuation arrangement for displaced components on vehicles, particularly trunk lids, convertible tops, engine hoods or the like, includes at least one supply line for the pressurized medium and one essentially non-pressure connection line to a reservoir for the working medium or a pump arrangement being functionally of the same kind, at least one preferably hydraulic working cylinder, and at least one control valve controlling the supply of a working medium in at least one working chamber of the working cylinder.

Abstract: In an hydraulic operating arrangement the working chambers (3, 4) of a double-acting working cylinder (1) are connected respectively by way of one reciprocally unlockable check valve (8, 9) with respectively one side of a reversible pressure medium source (11). The respective working chamber (3, 4) under pressure is connected with a joint, controllable proportional pressure regulating valve (15) for pressure control. On its exit side the proportional pressure regulating valve is connected with the pressure medium lines (6, 7) by way of respectively one check valve (18, 19) that opens in the direction of the pressure medium lines (6, 7), in particular between the corresponding unlockable check valves (8, 9) and the respectively belonging working chamber (3, 4) of the working cylinder (1).

Abstract: An arrangement for hydraulic actuation of a movable component on vehicles, particularly a vehicle top, trunk lid, a cover or the like, includes at least one double-action working cylinder (1) whose working chambers are connected to a pressure source (5) via a pressure line (4) or whose working chambers are at least temporarily connectable thereto through a switching valve (11).

Abstract: An actuation arrangement for movable components on vehicles, particularly for trunk lids or hoods, doors, vehicle tops and top covers, including at least one hydraulic cylinder (1) pivotably coupled to a cylindrical pivot pin (11) on the vehicle and/or on the movable vehicle component, and having at least one line (1) for the pressure medium in at least one working chamber (6, 9) of the hydraulic cylinder.

Abstract: A hydraulic actuation arrangement including a double-action working cylinder whose working chambers are in communication via a mutually unseatable check valve with one side of a reversible pressure medium source, respectively, whereby each working chamber is connected to a pressure medium reservoir by a pressure-relief valve or pressurizing valve, and at least one working chamber is furthermore connected to the pressure medium reservoir via an additional pressurizing valve. When an additional pressurizing valve is provided with two different pressure threshold values, the manual force used in emergency operation is therefore clearly reduced after introduction of the manual movement whereby these force levels for both movement directions may be selected independently from the maximum system pressure.

Abstract: The two working chambers (2, 2′, 3) of a working cylinder (1) of a hydraulic actuation arrangement may be directly connected with one another via a switchable dual-position valve (11), if necessary, whereby a resistance-free manual displacement of the components to be actuated is possible to a large extent—regardless of the working cylinder (1) that is driven by the hydraulic circuit (6) or also in case of a malfunctioning or a turned-off pressure medium source.

Abstract: An apparatus for hydraulic actuation of a movable component on a vehicle, for example a trunk lid, a cover or the like, includes at least one double-action hydraulic working cylinder (1) which is attached on one side to the vehicle and on the other side to the movable component, one of its working chambers (3) being connected to a passive hydraulic accumulator (4) and the other working chamber (7) being connected to a hydraulic pump (8), and a line branches off to a tank (9) between the pump and the working cylinder and into which line there is a pressure relief valve inserted.

Abstract: A pressure medium system, particularly a hydraulic system, which includes at least one working cylinder (pressure medium cylinder) and at least one pressure medium line for the supply and/or discharge of the pressure medium whereby assembly and disassembly is made possible, especially in vehicles, without great (manufacturing) efforts and by economic production by using a detachable retaining clamp (6) which grasps the outside of a pressure medium coupling (3) and an end piece (5) of the pressure medium line (4), which may be inserted into the pressure medium coupling (3).

Abstract: In a radial piston pump (2), which has pump elements (10) arranged radial in the pump housing (7) and which in turn have an inlet valve (11) and an outlet valve (12) activated by the medium, the valves (11, 12) are disposed at the outer side of the pump elements (10) whereby the inlet valves (11) are arranged coaxial relative to the pump piston (13). All inlet valves (11) are connected to a joint intake channel (20) that leads around the outside of the pump housing (7).

Abstract: An operating arrangement for movable parts on vehicles, especially rear covers, roof coverings or the like, is provided with a connection of the movable part 1 on the vehicle 2 by at least one hinge 3, a hydraulic piston/cylinder device 9 and, in all cases, at least one gas spring, wherein at least one hinge 3 has a lever 7 which ends in the interior of the vehicle and is connected to the hydraulic piston/cylinder device 9 also arranged in the interior of the vehicle for initiating a torque. To combine an optimal protection of the hydraulic piston/cylinder device with a simple construction, an as extensive as possible avoidance of transverse moments on the hinge and operating elements and good problem-free operation of the part 1 to be moved, the lever 7 is connected with the outer lever 6 of the hinge 3 outside of the vehicle body 2, lead through a sealed-off passageway 11 into the interior of the vehicle body 2 and is shaped in a bent manner.

Abstract: A hydraulic actuating system for movable parts, particularly for hinged covers on vehicles, includes at least one or more working cylinders with a piston equipped with sealing means pressing against the cylinder wall. A control unit is connected with one or all cylinders, and a pressure sensor connected to a control unit. Devices on the cylinder and piston are designed to cause pressure modulation in the cylinder and a common hydraulic circuit. The outgoing signals from the pressure sensor, are changed corresponding to the pressure modulations and are transmitted to the control unit to be used for position control and/or identification of one or all cylinders by the control unit.

Abstract: A hydraulic operating apparatus, especially for a vehicle covering, includes a reversible pump (2) which, via hydraulic lines (3, 4), one of which is in all cases provided with an unblockable check valve (7), is connected with the working chambers of at least one double-acting piston-cylinder arrangement (1). In order to make possible a very flexible supply and control of mutually independently operated piston-cylinder arrangements with a minimum of constructive and control-technical effort, additional hydraulic lines (10, 11) branch off from both hydraulic lines (3, 4) of the reversible pump, into which the check valves are placed, which additional hydraulic lines lead into a common hydraulic line (12) to at least one additional piston cylinder arrangement (13, 14).

Abstract: An operating arrangement for movable parts on motor vehicles, especially for trunk lids, folding tops and the like, consists of at least one hydraulic cylinder with a piston rod as the driving means which acts on the movable part either directly or indirectly, e.g., via a hinge, and at least one pump arrangement (7 through 11) mounted on the hydraulic cylinder with a tank, motor, and the like.

Abstract: An arrangement for hydraulically operating a rear cover, covering top or the like (1) on a vehicle, with at least one double-acting hydraulic working cylinder (3), which, on the one hand, is connected to the vehicle and, on the other hand, to the covering top wherein its working chambers (8, 9) are in connection with each one side of a switched pressure source (12) via one check valve (10, 11) each, wherein both of the check valves have an mutually releasing device and each of the working chambers parallel with respect to the check valves is kept via a pre-stress valve (15, 16), which steers into the tank, at a specified pressure level.

Abstract: A method of controlling an operating configuration for moving parts on motor vehicles, especially for trunk lids, convertible tops or similar devices, in which configuration the part to be moved is hinge connected to the motor vehicle by at least one connecting element and is provided with a controllable driving means, where the speed of the moving part (8) is monitored, and the driving means (17, 18) is turned off independently of any end position signals when the speed of these parts drops to a very low level or to zero; the motion of the automatically moving part on the motor vehicle can be stopped automatically or an emergency shut-down function is provided for the opening and closing movement when an obstacle is encountered. For this purpose, the speed of the moving part (8) is monitored indirectly by determining the speed of at least one connecting element (2, 3; 10-12, 16) or driving means (17, 18) which is connected to this part (8).

Abstract: An apparatus for hydraulically operating a rear cover, covering top or the like (1) on a vehicle, with at least one double-acting hydraulic working cylinder (3), which, on the one hand, is connected to the vehicle and, on the other hand, to the covering top, includes working chambers (8, 9) in connection with each one side of a switched pressure source (12) via one check valve (10, 11) each, wherein both of the check valves have an mutually releasing device and each of the working chambers parallel with respect to the check valves is kept via a pre-stress valve (15, 16), which steers into the tank, at a specified pressure level. To realize, in a simple and safe way, a passive wedging protection, in at least one connection line (4, 5) to the working cylinder (3), a line (22) enters the tank (17), in which a proportional pressure valve (23) is inserted which is controlled by the control electronics and is equal to the exact pressure that is necessary for the movement of the covering top (1) or the like.

Abstract: Two working cylinders are provided, a pressure medium connector being secured to a first cylinder and allowing fluid to flow to and from the first cylinder through the connector. A distributor is connected to the connector and has first and second ports through which pressure medium can flow. The second port is connected to the second cylinder. The first port is connected through the connector to the first working cylinder and is also connected to the second port. The first port is connected to a source of pressure medium and when pressure medium flows to or from the first port, pressure medium also flows through the connector to or from the first working cylinder as well as to or from the second port and the second working cylinder to cause the first and second working cylinders to operate simultaneously.

Abstract: The power steering mechanism for vehicles, in particular motor boats, has a control wheel that is drive-connected to a control via cable that is attached thereto and a lever system connected thereto. The core of the cable is mechanically connected to the lever system whereas the sheath of the cable is attached to the displaceable control member of the control valve. The control valve controls a hydraulic operating cylinder whose power piston also acts on the lever system of the control. To simplify and reduce the size of the arrangement, the operating cylinder and the control valve are built directly together in axial direction, and the core of the cable penetrates the control member of the control valve and is connected to the power piston of the operating cylinder and in this manner is also connected to the lever system of the control.