| 摘要 |
A drive system for a tooth rack lift comprises a vertical tooth rack (9), a gear (7) engaging the tooth rack (9) for driving the lift cage upwardly or downwardly along the tooth rack in dependence of rotary direction, and a counteracting roll (15), provided in the vicinity of the mesh area, which, bearing against the back of the tooth rack (9), counteracts deflection forces acting on the tooth rack (9) and caused by the engagement of the gear (7). Safety stop shoulders (17a, 17b) are provided which take over the function of the counteracting roll (15) in case the latter becomes worn out or breaks down. Thereby, the counteracting roll (15) and the safety stop shoulders (17a, 17b) are provided on the same member (5), e.g. a wall of a gear box, as the gear to improve tolerance and operational performance. |
