Abstract: An apparatus is proposed for releasably locking a bolt in the axial direction relative to a housing element surrounding it, in which the bolt has a circumferential groove tapering radially inward and a locking element inserted into this groove with a cross section adapted to that of the groove. The locking element protrudes radially beyond the cross section of the bolt and is in contact there on both sides with support surfaces, one of which is formed by the housing and the other of which is axially displacable under a compressive force load; at least one of these support surfaces is inclined, to provide a radially outwardly oriented reduction of the cross section formed between the support surfaces.

Abstract: An automatic overload clutch has interfitting clutch elements (10,11;50,51) which are spring-loaded to disengage two coaxial clutch parts (1,2;45,46). To provide for reengagement of the clutch parts after overload, in predetermined angular and rotational orientation, that is, with predetermined angular alignment and/or respective numbers of revolutions of the clutch parts, for example, to associate machine tool operation with certain tool positions, one of the clutch parts carries an engagement key element (37,60) and the other an interfitting engagement lock element (34,62). One of the engagement elements, for example, the lock element, is formed as a ring and movable upon relative rotation of the two clutch parts with recurring, or angular relative displacement.

Abstract: The invention relates to a method and an apparatus for measuring the torque passed through a rotatable machine element, in which two parts connected to this machine element rotate relative to one another. This relative rotation is translated into an amplified axial movement, and the axial movement is measured as a standard for the transmitted torque.

Abstract: To provide a compact clutch, two clutch parts (1, 2; 44,54,55,73,74) are located in axially fixed position on respective driving and driven shafts. The clutch can be automatically disengaged upon transfer of excessive torque, by including bolt elements (16,61) which are positioned circumferentially around one of the clutch elements (2) and parallel to the axis of rotation (17,60) of the clutch, the bolt elements carrying directly, or engaging respectively tooth or tooth gap elements which are shiftable axially against a bias force, for example provided by a spring (22).

Abstract: A safety coupling which provides positive torque transfer and which disengages above a disengagement torque. The safety coupling comprises two coupling halves which are engaged to restrict axial movement. Some rollers restricted by a first coupling half are urged into recesses in a stop face associated with a second coupling half by a biasing mechanism enabling positive transfer of torque. However, disengagement of the coupling halves is permitted by a relative axial movement of the rollers and the stop face when the bias is overcome, the rollers being free to roll on fixed axes.