| 摘要 |
The scaffolding comprises a post having a plurality of vertically aligned and equally spaced studs protruding on one of its surfaces. A frame supporting a work platform can move along the post, a sleeve being attached to the frame for guiding it along the post. The sleeve, the frame and the work platform partially surround the post. A lifting apparatus, installed on the sleeve, comprises a rotatable endless screw which is parallel to the post and which has a peripheral and helical flange which bears on the studs. An engine, an electric power drill or a manual handle will rotate the endless screw via one or two speed reducers. The rotation movement of the endless screw will result in the axial displacement thereof along the post, carrying the frame and work platform along with it. Another embodiment of the invention comprises a work platform which is supported at both of its ends by a lifting apparatus movable along a post. If two or more work platforms work at a given time, two work platforms may share a same post between the two of them and nonetheless work independently. The rail is also equipped with protruding aligned and equally spaced studs on which an endless screw bears for axial displacement of the latter resulting from its rotation movement along the rail. The endless screw is parallel to the rail.
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