Patent ID: 6931956

Claim:
Transmission apparatus, in particular for a motor vehicle, comprising at least one pinion ( 22 ) mounted for free rotation on a shaft ( 12 ), and controlled means ( 26 ) for coupling the shaft and pinion for rotation together, the means comprising two one-way locking mechanisms ( 26 ) which are mounted between the shaft and the pinion to prevent rotation of the pinion with respect to the shaft in one direction and to permit such rotation in the other direction, and vice versa, characterized in that said mechanisms comprise a sleeve ( 52 ) mounted on the shaft ( 12 ) adjacent to the pinion ( 22 ) and coupled to the shaft for rotation therewith, at least two pallets ( 58 ) mounted on a radial face ( 54 ) of the sleeve for pivoting movement in opposite directions about substantially radial axes between a rest position and a locking position, means ( 70 ) formed either on a radial face of the pinion ( 22 ) adjacent to the radial face of the sleeve, or on a separate attached member fixed with respect to the pinion, for abutting cooperation, in a first direction of rotation of the pinion with respect to the sleeve, with a first pallet ( 58 ) when the first pallet is in its locking position, and, in the other direction of rotation of the pinion with respect to the sleeve, with a second pallet ( 58 ) when the second pallet is in its locking position, first means ( 84 ) for displacing the first pallet ( 58 ) between its locking and rest positions, and second means ( 84 ) for displacing the second pallet ( 58 ) between its locking and rest positions, the first and second means being independent of each other and being able to displace the first and second pallets simultaneously in their locking position.