| 摘要 |
<p>PURPOSE:To remove a disengagement sound by installing a metallic coil torsion spring elastically preventing movement in the direction of disengagement from a ratchet interlinking stepped section. CONSTITUTION:One part of a cover plate 17 is bent inward, and faced to a recessed section 4, and a metallic coil torsion spring 16 is interposed between the cover plate 17 and a ratchet 3. The ratchet 3 is formed so as to be elastically mounted onto the outer circumferential surface of a latch 2 at all times by the elastic force of the metallic coil torsion spring 16, and the rebound of the ratchet 3 is suppressed. Since the elastic force of the metallic coil torsion spring 16 is hardly affected by a temperature, the effect of the elastic force of the torsion spring 16 is not changed. The sudden separation of a circular corner section 14 and a corner section 15 is prevented by the elastic force of the metallic coil torsion spring 16, thus obviating the generation of a disengagement sound.</p> |
