| 摘要 |
<p>The device has an auxiliary adjustment mechanism (166..169) which is employed upon failure of the electric motor (s) and/or the gearing (23, 31, 37) and/or the coupling shafts (25, 33, 39) between the latter and the electric motor (s). Pref. the electric motor block can be slid along a rail upon failure so that the free ends of their drive shafts can be coupled to a shaft (166) rotated via a manual operating handle (167). The rail has a T-shaped profile and the motor block can be locked in either position.</p> |
