| 摘要 |
<p>The vehicle hoist, consisting of a fixed frame, a mobile support and at least one screw jack with a housing, nut (17) and screw (16), has different threads (25, 19) on the nut and screw. The base (29) of the first thread (25) is broader than the base (23) of the second one (19), and it is made from a softer material. The first thread can be made from bronze or plastic, and the second of steel.</p> |
