Patent attributes
A fluid operated rotary drive comprises a drive housing (2) and an output shaft (4) able to be caused to oscillate in relation to it and having a pivotal abutment arranged on it which cooperates with a counter abutment (34 and 35). The pivotal abutment is able to be positioned about the longitudinal axis (8) of the output shaft (4) in different abutment settings and is able to be clamped in a releasable manner respectively against a clamping face (56) on the housing by means of a clamping means (53). The counter abutment (34 and 35) has an anchoring structure comprising at least one anchoring projection and opposite to it there is an anchoring face extending at least for some distance about the longitudinal axis (8) of the drive shaft and prior to initial fitting of the at least one counter abutment (34 and 35) being smooth, the anchoring structure being able to bite into the anchoring face on clamping the counter abutment (34 and 35) with the formation of at least one recess structure (61) having an anchoring recess (65).
