| 摘要 |
<p>In a screw lift the lift cage (4) is carried by a drive nut (10) rotatably provided on an essentially upright screw (2), the lift cage carrying a bearing means (8) and a drive means (6) for the nut. The screw (2) is supported by several supporting braces (14) attached thereto along the length thereof. The nut (10) has the shape of a spiral having turns, the pitch and axial thickness (a) of which are adapted to the distance (b) between the braces (14) and the dimension (c) of these in the length direction of the screw so as to enable the nut to pass freely past the braces by passing between the turns of the nut during the passage.</p> |
