Transmission mechanism, for windscreen wipers in particular, and a windscreen wiper device fitted with such a mechanism

摘要

PCT No. PCT/FR86/00103 Sec. 371 Date Nov. 5, 1986 Sec. 102(e) Date Nov. 5, 1986 PCT Filed Mar. 26, 1986 PCT Pub. No. WO86/05751 PCT Pub. Date Oct. 9, 1986.The transmission mechanism (M) allows the effective length (L) of the crank (6) to be varied to obtain a "parked position" of the windscreen wiper. The mechanism comprises an eccentric (9) secured to the shaft (3), this eccentric being mounted in a bore (13) of the crank (6); locking structure (V) for locking the rotation between the eccentric (9) and the crank (6) to ensure a linkage in rotation in one direction and to release the eccentric from rotation with the crank in the opposite direction; and locking structure (D) for locking the crank (6) for rotation in relation to the support (4) when the shaft (3) rotates in the reverse direction to the normal direction, as well as at the start of the rotation of the shaft in the normal direction. The mechanism comprises a sleeve (24) fixed to the support, a bush (27) mounted in the sleeve and freely traversed by the shaft (3) and locking structure (37) for locking the bush (27) for rotation in relation to the sleeve (24) when the shaft (3) rotates in the reverse direction to the normal direction of operation, the bush being free to rotate in relation to the sleeve in the normal direction.