Abstract: A power screwdriver is provided with a drive part having a drive motor, a gear case with gearing elements; an output shaft led out of the gear case; a support offset laterally relative to the output shaft and fixedly connected to the gear case, and a rotary joint with drive-associated ring connected to the drive part and gearing-associated ring connected to the gear case. An actuating ring is arranged coaxially to the output shaft and is movable relative to the drive-associated ring and relative to the gearing-associated ring. It is movable between a release position, in which the rings are rotatable relative to each other, and a blocking position, in which the rings are blocked relative to each other. A spring element acts on the actuating ring over its movement path, extending from blocking position to release position, in the direction of the blocking position.

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 tensioning device for a thread end portion of a bolt has a cylindrical housing and a piston, moveable in longitudinal direction therein and connectable to a hydraulic supply. An interchangeable sleeve extends centrally through the piston. At its end it has an internal thread with engagement length to be screwed onto the thread end portion. The sleeve has a radially expanded portion carried axially by a carrier face of the piston. In order to prevent the sleeve from prematurely contacting the threaded bolt when mounting the bolt tensioning cylinder and prevent damage to the threads, the sleeve is moveable longitudinally relative to the piston. The longitudinal sleeve travel is defined by the carrier face as first longitudinal stop and by a second longitudinal stop. The longitudinal sleeve travel is at least equal to, preferably greater, than the engagement length of the internal thread of the sleeve.

Abstract: A tension device for straining a threaded bolt by applying a pulling force on a threaded end portion has a housing and a piston moveably disposed therein. A hydraulic supply is connected to the housing. A supporting tube is arranged on the housing. The supporting tube is arranged between the housing and a base surrounding the threaded bolt and transmits tension forces acting in the housing to the base surrounding the threaded bolt. A pull nut to be fastened by threaded engagement on a threaded end portion of the threaded bolt is provided. The pull nut has a pressure face supported in longitudinal direction on a pressure transmission face of the piston. A return spring acting on the piston in a direction toward the supporting tube has a first end bearing against a housing-side spring support and a second end bearing against a piston-side spring support.

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 tensioning device for threaded bolts has a supporting tube and a cylinder with a hydraulic supply connected thereto. The supporting tube surrounds the threaded end section of the bolt. A piston is moveable in the cylinder longitudinally. An exchange socket is connected to the piston and driven axially by it. The exchange socket has a first end with internal thread to be screwed onto the threaded end section and a second end with an external polygon member. A tool attachable to the external polygon member enables turning of the exchange socket. The tool has a cup-shaped section having a first open end and an inner side with tool faces that engage the external polygon member. The tool has a drive section that is slimmer than the cup-shaped section and connected to a second end of the cup-shaped section. The drive section extends away from the cup-shaped section.

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 tensioning device for stretching a threaded bolt by applying tension to the threaded portion of the threaded bolt has a base and a support tube surrounding the threaded bolt and supported on the base. A cylinder housing is arranged as an axial extension on the support tube. A piston is moveably arranged in the cylinder housing and delimits together with an inner wall of the cylinder housing a hydraulic operating chamber. An interchangeable bush is rotatable relative to the piston and can be entrained axially by the piston. The interchangeable bush has an internal thread to establish a screw connection to the threaded portion. A device for path and/or position detection with first and second interacting elements is provided. The first element is fastened to the at least one piston and faces the cylinder housing. The second element is fastened to the cylinder housing and faces the piston.

Abstract: A clamping device for expanding a threaded bolt is provided with a support pipe supported against an underlay surrounding the threaded bolt. A cylindrical housing arranged in extension of the support pipe has a piston movable in longitudinal direction and connectable to a hydraulic supply. A changeable bushing is axially carried by the piston and is provided with an inner thread and a radially expanded portion. A resilient arrangement is arranged around the bushing and acts axially on the piston. A lid is secured to the housing. The other support of the resilient arrangement is provided on the lower side of the housing. The lid has a lid base member and a closure lid. The lid base member is provided with an opening closable by the closure lid. The radial extent of the opening is greater than the radial extent of the radially expanded portion of the bushing.

Abstract: In a tensioning device for expanding a threaded bolt by a pull on its threaded end portion, a supporting tube surrounds the threaded end portion and a nut is screwed onto the threaded end portion. A cylinder is arranged in the prolongation of the supporting tube and has at least one piston movable therein in the longitudinal direction and connectable to a hydraulic supply. An interchangeable bush is screwable to the threaded end portion and is drivable axially by the piston. A gear arrangement for adjusting the nut is provided. Components of the gear arrangement are a driver element engaging externally on the nut and a drive shaft provided with an engagement structure for a drive tool. In this case, the axis of rotation of the drive shaft is arranged at an angle of preferably 90° to the longitudinal mid-axis of the piston.

Abstract: A nut for screw connections has two substantially identically sized nut segments of a half-shell shape, wherein the nut segments each have an inner side provided with an inner thread segment defining together an inner thread. The nut segments are connected to each other so as to be moveable toward each other until the nut segments reach a closed position. The nut segments are maintained in the closed position by springs or a locking device. An actuating device is moveably arranged on at least one of the two nut segments for releasing the closed position, wherein the actuating device is adapted to manually actuated.

Abstract: A tension device for straining a threaded bolt by applying a pulling force on a threaded end portion has a housing and a piston moveably disposed therein. A hydraulic supply is connected to the housing. A supporting tube is arranged on the housing. The supporting tube is arranged between the housing and a base surrounding the threaded bolt and transmits tension forces acting in the housing to the base surrounding the threaded bolt. A pull nut to be fastened by threaded engagement on a threaded end portion of the threaded bolt is provided. The pull nut has a pressure face supported in longitudinal direction on a pressure transmission face of the piston. A return spring acting on the piston in a direction toward the supporting tube has a first end bearing against a housing-side spring support and a second end bearing against a piston-side spring support.

Abstract: A tensioning device for treaded bolts has a supporting tube and a cylinder with a hydraulic supply connected thereto. The supporting tube surrounds the threaded end section of the bolt. A piston is moveable in the cylinder longitudinally. An exchange socket is connected to the piston and driven axially by it. The exchange socket has a first end with internal thread to be screwed onto the threaded end section and a second end with an external polygon member. A tool attachable to the external polygon member enables turning of the exchange socket. The tool has a cup-shaped section having a first open end and an inner side with tool faces that engage the external polygon member. The tool has a drive section that is slimmer than the cup-shaped section and connected to a second end of the cup-shaped section. The drive section extends away from the cup-shaped section.

Abstract: A tensioning device for extending a threaded bolt by tensioning the threaded end section thereof is connectable to a hydraulic supply. The tensioning device has a supporting tube surrounding the threaded end section. A cylinder is arranged in continuation of the supporting tube and s piston is arranged in the cylinder and movable in longitudinal direction of the cylinder. An exchange socket is screwable to the threaded end section and configured to be carried along axially by the piston. A pin is movably arranged in the longitudinal direction and has a pin body with a first pin end supported in the longitudinal direction against the threaded end section of the threaded bolt. A sensing device senses a position of the pin in the longitudinal direction. An evaluation and control unit connected to the sensing device is acting on the hydraulic supply to enable the hydraulic supply.

Abstract: A tensioning device for extending a threaded bolt by tensioning the threaded end section has a supporting tube surrounding the threaded end section, a cylinder arranged in continuation of the supporting tube and having at least one piston axially movable therein, an exchange socket which is screwable to the threaded end section and is configured such that it can be carried along axially by the piston, and a pin arranged in an axially movable manner in a longitudinal guide in the exchange socket. The pin end is axially supportable against that end of the threaded bolt that has the threaded end section. In order to assess the actually usable thread projection even in cases in which known tensioning devices provide imprecise results, the pin is formed in a radially widened manner at its pin end compared with the pin cross section.

Abstract: This invention relates to a method for hydraulically tensioning screw bolts as well as to screw bolts and screw bolt tensioning devices for carrying out the method. It is proposed to apply the total pretensioning force for one part via an external thread and for the remaining part via an internal thread of the bolt end.

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 safety device on a high-pressure connector of a hydraulic device has a shield that surrounds the high-pressure connector and catches hydraulic liquid that escapes at high pressure. The shield has a housing surrounding seal-tightly a pressure medium distributor on the hydraulic device and has furthermore a protective pipe connected to the housing and surrounding a connecting nipple for a high-pressure hose conduit adapted to be coupled by a hose coupling.

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 nut for screw connections has two substantially identically sized nut segments of a half-shell shape, wherein the nut segments each have an inner side provided with an inner thread segment defining together an inner thread. The nut segments are connected to each other so as to be moveable toward each other until the nut segments reach a closed position. The nut segments are maintained in the closed position by springs or a locking device. An actuating device is moveably arranged on at least one of the two nut segments for releasing the closed position, wherein the actuating device is adapted to manually actuated.