| 摘要 |
<p>PURPOSE: To make it possible to screw a push bolt for preliminary compression of a spring without over tightening and without excessively working the main body of a clamp by attaching a liner to the push bolt for preliminary compression of the spring and touching it to a spring frame portion. CONSTITUTION: Screwing of a push bolt 7 for the preliminary compression of a spring is promoted, the tip of the push bolt 7 butts into a tightening bar 4, the push bolt 7 is further screwed to a predetermined length, the tightening bar 4 is pushed out to the outside, the spring 5 is compressed by a predetermined amount, and a preliminary compression state is formed. At this time, a liner 8 attached to a push bolt 7 touches the outer face of a frame portion 21 of the main body of the clamp, and screwing of the push bolt 7 is blocked. By doing this, excessive tightening can be prevented when screwing the push bolt 7 for preliminary compression of the spring, or an excessive working of the main body 2 of the clamp becomes unnecessary.</p> |
