| 摘要 |
<p>The lifting clamp (1) has a rectangular frame (14) and a rectangular box (15) with an upper section (150) positioned between the upper and lower sections (140,141) of the frame and displaced relative to the latter against a resistance provided by the friction between the box and the frame. A clamp screw (16) fits through an opening (142) in the upper section of the frame for engaging a screw thread (152) in the upper section of the box.</p> |
