| 摘要 |
n elevator, which is provided with a drive mechanism 4 composed of a motor with a rev reducer and a friction pulley 9, may be replaced, during renovation process, by a new drive mechanism composed of a new motor, rev reducer and friction pulley 8, while the overall weight 10 of the counter-weights is selected to drive the empty cabin in free descending movement so that, at the release of the brake and the ascent of the empty cabin 3 achieved by manual rotation of the engine's steering wheel, the cabin ought to be able, when the manual action on the steering wheel is stopped, to progressively cut off its ascending movement and either to come back to the absolute inoperative condition or to continue its descending movement. |
