| 摘要 |
<p>The protective means is supported by means of sliding blocks (53) which can slide in two annular channels (37, 39) formed in the base of each of the two forks (29, 31); the base (29A) of the fork (29) is formed with a circular cross section essentially as far as the arms (29B) of the fork, and the channel (37) for the annular sliding block (53) is recessed in said base (29A) adjacently to said arms (29B) of the fork, between these and the pin (33) locking the shaft to the fork (29).</p> |
