Manual adjustment device for adjusting a setting member

摘要

A manual adjustment device permits emergency operation of a vehicle if a stepping motor that normally adjusts the position of a setting member between two limit positions becomes inoperative due to an electrical malfunction. The rotor shaft (19) of the stepping motor (3) is provided with teeth (29). A pinion (31) can be brought into engagement with the teeth (29) against the force of a coil spring (35). The pinion (31) is disposed inside the stepping motor housing (17) and is mounted on an adjustment shaft (33) that extends through an opening in the housing (17). A manual adjustment element (51; 105) is disposed outside of the housing (17) and is connected to the adjustment shaft (33). The manual adjustment element (51; 105) can be manipulated to press the pinion (31) into engagement with the teeth (29) and to then rotate the rotor shaft (19).