Worm gear drive for door has worm wheel able to rotate co-axially relative to drive shaft, and coupling with two coupling disks, one on worm wheel, other on shaft

摘要

The drive has a worm shaft (2), a worm wheel (3) and a driven shaft (4). The worm wheel can rotate co-axially relative to the drive shaft. There is a coupling between the worm wheel and a driven shaft with coupling elements able to move relative to each other and to engage with each other. The coupling has two coupling disks (7, 8), one on the worm wheel, the other on the shaft.