Abstract: A dowel bolt is formed of a bolt (1) and has at the trailing end an outer thread (2) and on the leading end an expansion head (3) expanding in the setting direction (S) and an expansion sleeve (4) that can be expanded by the expansion head (3). At the trailing end face (15) directed away from the setting direction of the bolt, the bolt has at least one peripheral recess (16) with a depth (t1) providing a setting control and that can be economically manufactured.

Abstract: A dowel bolt is formed of a bolt (1) and has at the trailing end an outer thread (2) and on the leading end an expansion head (3) expanding in the setting direction (S) and an expansion sleeve (4) that can be expanded by the expansion head (3). At the trailing end face (15) directed away from the setting direction of the bolt, the bolt has at least one peripheral recess (16) with a depth (t1) providing a setting control and that can be economically manufactured.

Abstract: A thread forming screws including opposite flanks connecting the screw crest region with the screw root region and tapering outwardly toward the root region, with each flank being formed of outer and inner flank sections tapering toward the root sections at different angles, and with the crest region being formed of a first region section (8) extending parallel to a central axis of the screw and a second, inclination region section (7) inclined toward the root region (5) in a direction opposite a setting direction (S) at an angle of from about 10° to about 45°.

Abstract: A thread forming screws including opposite flanks connecting the screw crest region with the screw root region and tapering outwardly toward the root region, with each flank being formed of outer and inner flank sections tapering toward the root sections at different angles, and with the crest region being formed of a first region section (8) extending parallel to a central axis of the screw and a second, inclination region section (7) inclined toward the root region (5) in a direction opposite a setting direction (S) at an angle of from about 10° to about 45°.

Abstract: The electrical connecting apparatus tests for electrical faults in an electrical and/or electronic device having a circuit board, wire support or the like equipped with a plurality of blade-terminal strips and/or sleeve-terminal strips has at least one supporting device which has test contacts for testing the blades or sleeves of the blade-terminal strips and/or sleeve-terminal strips of the device being tested and restoring springs which may include a plurality of coil springs. The electrical contact between the socket and/or terminal strip of the device being tested and the test contacts is made by at least partially overcoming the spring forces of the restoring springs.

Abstract: A wrist for an industrial robot with a large orientation capacity comprising first, second , third and fourth turnable wrist parts arranged in series with each other. The first wrist part is rotatable about a first axis. The second wrist part is journalled in the first wrist part and is rotatable about a second axis which intersects the first axis. The third wrist part is journalled in the second wrist part and is rotatable about a third axis which intersects the second axis. A tool attachment is rotatably journalled in the third wrist part about a fourth axis which intersects the third axis.

Abstract: The invention relates to an industrial robot of the kind comprising a body and an arm system pivotally journalled thereon. In order to achieve an improved and extended working range in a vertical space underneath or above the robot, the arm system is supported in the body via a substantially fork-shaped bearing bracket. Linear actuators intended for the operation of the arms are pivotally journalled in the bearing bracket so that, when the arm system assumes its neutral position, the actuators will be oriented primarily transversely to the longitudinal axis of a body and substantially parallel with the first arm pivotally journalled in the bearing bracket. Both actuators are disposed between the body and the first arm in all positions of the arm system.

Abstract: A handling robot for a current-consuming appliance (e.g. a welding head) comprises a pivotal stand with a first arm which is rotatably journalled in the stand and a second arm which is rotatably journalled in the first arm. The second arm has a sleeve which is journalled in the first arm. In said sleeve, a portion with a holder for the appliance is rotatably journalled. From a transformer, the supply current for the appliance is conducted to a rotatable contact device and to two preferably concentric tubular electrical conductors through the rotatable portion. The tubular conductors are utilized as conduits for cooling water.

Abstract: An electrical contact device for transmitting heavy currents between relatively rotatable parts, for example between a fixed welding transformer and a rotatable unit which supports a spot welding gun. The contact device comprises a spaced-apart pair of annular, axially fixed, contact segments on one unit and, between these, an axially displaceable pair of annular contact disks on another unit. The disks are urged towards each other by springs and are thereby centered by a centering device to provide a well-defined clearance between each contact disk and the confronting contact segment, and the disks are pressed outwardly against the co-acting contact segments, to eliminate said clearances when current is to flow therebetween, by an annular operating device. The contact device has particular utility in robotics and prevents wear at the contacting surfaces on the appearance of relative rotation therebetween.