| 摘要 |
<p>The head (1) has a base (3) on which a projecting lug (4) is situated, where the lug cooperates with a stopper body during assembling the body and the lug. The lug includes an opening emerging laterally at two ends to pass completely through the lug to ensure anchoring of the body with the head. The lug is in elongate shape, and the opening is in shape flared along the longitudinal direction of the lug, where the widest part of the opening is placed on a side of the free end of lug. The lug is in non-symmetry revolution shape to prevent the body rotating about the lug.</p> |
