DRIVE UNIT WITH MOTOR AND TRANSMISSION FOR A COMPONENT MOVABLE BETWEEN END POSITIONS

摘要

To reduce the lift travel with a simple end position-recognition device which is reliable even on emergency manual operation and can be retrofitted, a radially projecting cam (2.7) connected to a drive shaft (2) of the drive unit engages during one revolution from tooth to tooth with the inner toothing of a ratchet (11) rotatable about and concentric with a spindle (11.1) offset parallel to the drive shaft (2). The cam (2.7) has an axial lift such that it can mesh with the ratchet (11) even with an axial shift of the drive shaft (2) in the event of emergency actuation.