| 摘要 |
<p>The transmission mechanism (M) enables to vary the efficient length (L) of the crank (6) to control a ''parking position'' of the windscreen wiper. The mechanism comprises an eccentric (9) fitted on the shaft (3), said eccentric being mounted in a bore (13) of the crank (6); means (V) for rotational blocking between the excentric (9) and the crank (6) to provide for a rotational connection in one direction and for the rotational release of the eccentric with respect to the crank in the opposite direction; and means (D) for the rotational blocking of the crank (6) with respect to the frame (4) when the shaft (3) rotates in the reverse direction to the normal direction, as well as at the beginning of the rotation of the shaft in the normal direction. The mechanism comprises a sleeve (24) fixed to the frame, a bush (27) mounted in the sleeve and freely traversed by the shaft (3) and means (37) to rotationally block the bush (27) with respect to the sleeve (24) when the shaft (3) rotates in reverse direction to a normal operation direction, the bush (27) being free to rotate with respect to the sleeve in the normal direction.</p> |
