Abstract: In a lifting and transporting device for lifting a load (13) and for transporting the same transversely to the lifting direction (8), for use in the production of a screwed flange connection (35), in order to bring a tensioning tool (13) into a tensioning position in which it is in engagement with a screw bolt connection (18) to be pretensioned, or into a transport position in which it is out of engagement with a screw bolt connection and can be transported to the next screw bolt connection, wherein the flange (36a, 36b) extends horizontally, comprising a frame (2) for picking up and for lifting a load (13), a holding device (3) for holding the load, wherein the holding device is movable relative to the frame in the lifting direction (8), and comprising a hoisting device (4) for lifting and lowering the holding device (3) with the load (13) attached thereto, wherein the frame (2) is mounted on a first and a second support bearing (5, 6) and the first support bearing (5) is designed for abutment against the fl

Abstract: In a nut runner with a motor (3) for generating a torque, a tool holder (9) which is operatively connected with the motor (3) and transmits the generated torque to a tool, a measuring device (7) which continuously measures at least one measurement quantity for determining the torque and forwards the measurement value, and a control device (12) which is connected with the motor (3) and the measuring device (7) and controls the operation of the motor (3) such that after starting it generates a continuously increasing torque, and which shuts off the motor upon reaching a setpoint measurement value, the measuring device is a torque sensor (7) and the torque sensor (7) is arranged between the motor (3) and the tool holder (9).

Abstract: A torque wrench with a ratchet and a drive for the ratchet includes a ratchet housing with two opposed side walls which have a specified distance to each other and are connected with each other. A through opening extends transversely through the two side walls, which is designed to accommodate a ratchet rotary body, wherein its axis of rotation extends parallel to the axis of the through opening. The ratchet rotary body includes a fastening means for fastening a supporting device to the torque wrench, by means of which the torque wrench can be supported perpendicularly to the axis of rotation of the ratchet rotary body.

Abstract: In a lifting and transporting device for lifting a load (13) and for transporting the same transversely to the lifting direction (8), for use in the production of a screwed flange connection (35), in order to bring a tensioning tool (13) into a tensioning position in which it is in engagement with a screw bolt connection (18) to be pretensioned, or into a transport position in which it is out of engagement with a screw bolt connection and can be transported to the next screw bolt connection, wherein the flange (36a, 36b) extends horizontally, comprising a frame (2) for picking up and for lifting a load (13), a holding device (3) for holding the load, wherein the holding device is movable relative to the frame in the lifting direction (8), and comprising a hoisting device (4) for lifting and lowering the holding device (3) with the load (13) attached thereto, wherein the frame (2) is mounted on a first and a second support bearing (5, 6) and the first support bearing (5) is designed for abutment against the fl

Abstract: In a torque wrench system with a drive unit (2) and a ratchet unit (3), which can releasably be assembled to a wrench unit, wherein drive unit (2) and ratchet unit (3) releasably are rigidly connected with each other in the assembled condition, the drive unit (2) includes a first drive coupling element (5) and the ratchet unit (3) includes a ratchet (18) and a second drive coupling element which is in driving engagement with the ratchet (18) and, in the assembled condition of drive unit (2) and ratchet unit (3), also with the first drive coupling element (5) for driving the ratchet (18), the drive unit (2) includes at least one latch (7) which is movable from an unlocking position, in which the drive unit (2) and the ratchet unit (3) are releasable from each other, into a locking position, in which the drive unit (2) and the ratchet unit (3) are rigidly connected with each other in the assembled condition, and back, and at least one actuating element (9) with which the at least one latch (7) is movable from t

Abstract: A torque wrench with a ratchet and a drive for the ratchet includes a ratchet housing with two opposed side walls which have a specified distance to each other and are connected with each other. A through opening extends transversely through the two side walls, which is designed to accommodate a ratchet rotary body, wherein its axis of rotation extends parallel to the axis of the through opening. The ratchet rotary body includes a fastening means for fastening a supporting device to the torque wrench, by means of which the torque wrench can be supported perpendicularly to the axis of rotation of the ratchet rotary body.

Abstract: In a torque wrench system with a drive unit (2) and a ratchet unit (3), which can releasably be assembled to a wrench unit, wherein drive unit (2) and ratchet unit (3) releasably are rigidly connected with each other in the assembled condition, the drive unit (2) includes a first drive coupling element (5) and the ratchet unit (3) includes a ratchet (18) and a second drive coupling element which is in driving engagement with the ratchet (18) and, in the assembled condition of drive unit (2) and ratchet unit (3), also with the first drive coupling element (5) for driving the ratchet (18), the drive unit (2) includes at least one latch (7) which is movable from an unlocking position, in which the drive unit (2) and the ratchet unit (3) are releasable from each other, into a locking position, in which the drive unit (2) and the ratchet unit (3) are rigidly connected with each other in the assembled condition, and back, and at least one actuating element (9) with which the at least one latch (7) is movable from t

Abstract: In a nut runner with a motor (3) for generating a torque, a tool holder (9) which is operatively connected with the motor (3) and transmits the generated torque to a tool, a measuring device (7) which continuously measures at least one measurement quantity for determining the torque and forwards the measurement value, and a control device (12) which is connected with the motor (3) and the measuring device (7) and controls the operation of the motor (3) such that after starting it generates a continuously increasing torque, and which shuts off the motor upon reaching a setpoint measurement value, the measuring device is a torque sensor (7) and the torque sensor (7) is arranged between the motor (3) and the tool holder (9).

Abstract: A lifting and transporting device for lifting a load and transporting the same transversely to the lifting direction includes a frame (2) which for picking up and lifting a load (15) extends around a load space (13) of specified size and a holder (3) for holding the load (15). The holder (3) is movable in lifting direction (9) relative to the frame (2), and includes a hoist (4) which is attached to the frame (2) transversely to the lifting direction (9) beside the load space (13), and includes a portion (25) extending on the load space side thereof, to which the holder (3) is attached, and which is equipped for lifting and lowering the holder (3) with the load (15) attached thereto.

Abstract: A lifting and transporting device for lifting a load and transporting the same transversely to the lifting direction includes a frame (2) which for picking up and lifting a load (15) extends around a load space (13) of specified size and a holding means (3) for holding the load (15). The holding means (3) is movable in lifting direction (9) relative to the frame (2), and includes a hoisting means (4) which is attached to the frame (2) transversely to the lifting direction (9) beside the load space (13), and includes a portion (25) extending on the load space side thereof, to which the holding means (3) is attached, and which is equipped for lifting and lowering the holding means (3) with the load (15) attached thereto.

Abstract: A hydraulic screw tensioning device includes a cylinder supported on a machine part that is to be clamped by a threaded bolt and nut. A first annular piston is guided in a sealed manner in a cylinder element, is disposed on the change sleeve, and is supported against an inclined surface of a monolithic collar of the change sleeve. At least one second annular piston is guided in a sealed manner in a cylinder element, is disposed on the change sleeve, and is supported against the first annular piston. Respective, facing inclined axial annular surfaces on the annular pistons and on the cylinder elements or annular shoulders thereof are inclined in the same direction and are pressure-remote. Annular surfaces on the second annular piston or pistons and on the annular shoulders of the cylinder elements extend perpendicular to the cylinder axis and are pressurized.

Abstract: In a method for controlling a hydraulic power wrench with a pivotable lever pivoted by a piston-cylinder unit and a ratchet arrangement for stepwise rotation of a ratchet bushing by advancing and return strokes, parameters such as nominal torque or pre-load or screw parameters are entered into an electronic input unit. Nominal pressure corresponding to the parameters is determined by an electronic evaluation unit and generated by the pump. The piston-cylinder unit is pressure-loaded for performing a pre-stroke until the nominal pressure is reached followed immediately by a return stroke. A time interval from beginning of pressure loading until reaching nominal pressure or until reaching an initial pressure after pressure relief is measured. Pressure loading and measuring are repeated. The measured time intervals are compared. Pressure loading cycles are stopped when at least the last measured time interval is shorter than at least the penultimate measured time interval.

Abstract: A nut for a screw connections has, in the circumferential direction, segments that are substantially of the same size, abut one another in separating planes, and are movably guided relative to one another between an open position and a closed position. Closing elements serve for movement of the segments toward one another into the closed position. In order to provide a segmented nut that is suitable for many applications in facility and apparatus engineering, the segments are pivotable relative to one another and connected for this purpose in a first end area in a pivotable way. The closing elements load the segments in the second end areas.

Abstract: A screwed connection has a threaded bolt; a nut; a washer arranged between the nut and a surface of a component to be clamped; a screwing device with a housing, a holding tool connected to the housing, and a tightening tool that engages positively the nut; a measuring element arranged in the washer for measuring a compressive force generated by tightening the screwed connection. The washer has an anti-rotation device oriented toward the surface of the component. The outer periphery of the washer is positive-lockingly engaged by the holding tool. The washer has no positive or frictional connection to the threaded bolt, and the holding tool has no torque supporting action on the threaded bolt or on any other part so that a reaction moment, generated when tightening the nut, is introduced from the housing of the screwing device through the washer into the component to be clamped.

Abstract: A hydraulic threaded bolt clamping device for tightening and releasing threaded bolts has a pressure medium supply connected to a pressure medium connector. A cylinder rests against a machine part that is to be clamped and a periodically pressure-loaded piston is guided seal-tightly in the cylinder and rests against a threaded bushing screwed onto the threaded bolt. A control device actuates the pressure medium supply for supplying pressure medium to the bolt clamping device. After a nominal value corresponding to a nominal prestressing force has been reached the pressure medium supply is switched off. The nominal screw prestressing force or a corresponding nominal pressure of the pressure medium supply is preset by an input device. A measuring device measures relative displacement of the threaded end of the bolt relative to the cylinder. An evaluation device determines residual actual screw prestress after pressure relief of the bolt clamping device.

Abstract: A hydraulic screw tensioning device for tightening and loosening highly stressed screws or bolts comprising a cylinder supported on a machine part that is to be clamped by a threaded bolt and nut. A change sleeve is threaded onto a threaded end of the bolt. A first annular piston is guided in a sealed manner in a cylinder element, is disposed on the change sleeve, and is supported against an inclined surface of a monolithic collar of the change sleeve. At least one second annular piston is guided in a sealed manner in a cylinder element, is disposed on the change sleeve, and is supported against the first annular piston. Respective, facing inclined axial annular surfaces on the annular pistons and on the cylinder elements or annular shoulders thereof are inclined in the same direction and are pressure-remote. Annular surfaces on the second annular piston or pistons and on the annular shoulders of the cylinder elements extend perpendicular to the cylinder axis and are pressurized.

Abstract: A hydraulic screw tensioning device for tightening and loosening highly stressed screws or bolts comprising a cylinder supported on a machine part to be clamped by a threaded bolt and nut at least one piston guided in the cylinder and periodically supplied with pressure, a change sleeve to be threaded onto a threaded end of the bolt, with the piston resting against the change sleeve, a rotary sleeve in the cylinder for positive connection with the nut, a first gear mechanism for driving connection with the rotary sleeve, a second gear mechanism for driving connection with the change sleeve, a drive motor for the gear mechanisms, a connecting shaft between a gear in the second gear mechanism and a gear in the first gear mechanism, a device for alternative coupling of the drive motor with the change sleeve or the rotary sleeve, and respective hexagonal or square recesses or extensions on a gear secured to the change sleeve and on the gear in the second gear mechanism to positively receive a tool for driving the

Abstract: The invention relates to a switching device for a hydraulic high-pressure system, particularly for operating hydraulic screw-tightening devices, comprising: a directional seat valve (17), which is subjected to the action of high pressure in the closing direction; a control piston (22), which can be subjected to the action of low pressure and which displaces the directional seat valve in the opening direction, and, a control valve (23), which either establishes or interrupts a connection to a pressureless low-pressure return flow line.

Abstract: A double nut for a controlled fixing of a component using a bolt connection, comprising a pulling sleeve having an internal thread adapted to be screwed onto a threaded end of a bolt, and a pressing sleeve adapted to be supported on the component. An internal thread of the pressing sleeve is adapted to be screwed onto an external thread of the pulling sleeve, and engages such external thread to such an extent that the internal thread of the pressing sleeve is spaced by a distance equaling several threads from that end of the pulling sleeve that faces the component. The external thread of the pulling sleeve is furthermore adapted to threadedly receive a pull bushing of a bolt-tightening cylinder that has a support bushing adapted to be supported on the component and to extend over the pulling sleeve and the pressing sleeve.

Abstract: A hydraulic threaded bolt tightening device (1) for tightening and loosening large bolted connections, comprising a cylinder supported on a machine part to be clamped by means of a threaded bolt and a nut (2), at least one piston which is guided thereon in a sealed manner, with a threaded bush screwed on to one end of the threaded bolt and which can be pressurized, a pressure medium supply (4) to the threaded bolt tightening device (1), an adjusting ring.