| 摘要 |
<p>PCT No. PCT/FR83/00166 Sec. 371 Date Apr. 4, 1984 Sec. 102(e) Date Apr. 4, 1984 PCT Filed Aug. 8, 1983 PCT Pub. No. WO84/00744 PCT Pub. Date Mar. 1, 1984.It particularly concerns improvements on safety hooks doted with an articulated arm (1) on to the body of the hook (2) on its top part and opening externally from the hook and doted with a fastening device of the free end of the body of the hook by the free end of the arm and characterized by one flat contact face (f, f') on each of the two parts, one receiving a cylinder shaped prominence (c), and the other one receiving a cylinder-shaped hole (t) so as to obtain the penetration of the prominence in the hole when shutting the hook thus avoiding any bending out of shape of the body of the hook when the load is too important. The invention applies to hooks for lifting particularly.</p> |
