| 摘要 |
A wrenching portion provided in an adjuster and employed for assembling is formed at a gripping portion for rotation. The gripping portion is formed in a polygonal shape. In this configuration, the adjuster is decreased in size and weight and its operability of adjusting a driving depth is improved. An undercut portion is removed in a vertical direction and a non-slip rugged portion is provided in only a longitudinal direction so that it can be manufactured in a simple tow-part mold, thereby reducing the production cost.
|
