| 摘要 |
<p>It comprises a body (1), a rotation spindle (shaft) (2) and a hand wheel (4) which are made of steel, a lower wear piece (6) with a U-shaped housing (43) and an upper wear piece (5), of which the face (50) which contacts the winding bar is planar, it being possible for the said wear pieces (5, 6) to be secured to the hand wheel (4) in the case of the upper wear piece (5) and to the end (21) of the spindle (2) in the case of the lower wear piece (6), by screwing from in front; the hand wheel (4) being mounted so that it can pivot, on the end (21) of the rotation spindle (2), about two partially screw-threaded stepped spindles (40) which are screwed into the hand wheel (4) at the latter's periphery, and the non screw-threaded parts (42) of which are inserted into holes (30) made in the said end (21) of the rotation spindle (2). <IMAGE></p> |
