| 摘要 |
<p>Saddle (1) at the top end is tapered and provided by an opening (1a), in which are toward stored two pressure desks (2) with the concave cavity (2a) and the grooved cylindrical surface (2b), between the pressure desks (2) are opposite each other situated two rollers (5) provided by slugged shoulder (5a) to fit to the concave cavity (2a). The rollers (5) are provided by a hole (5b) with thread and prism part (5c) to fit to the opening (3a) of the supporting side (3), the supporting side (3) provided by a split tongue (3b).</p> |
