Patent ID: 7631737

Claim:
A system for setting an upstream member of a drive into coincidence with a downstream member of a gearbox in order to couple the upstream member with the downstream member in a non-permanent connection for transmitting rotary motion between the upstream member and the downstream member, the upstream and downstream members each comprising complementary projecting portions and concave portions, the respective projecting portions and concave portions of said upstream and downstream members being set mutually into coincidence in coupling the upstream member with the downstream member, the system comprising: a coupling-attempt assembly having i) an approach part exerting an approach displacement of the upstream member for approaching the complementary portions and ii) a failure-revealing part for revealing a failure of an attempt when the projecting portions of the upstream member are substantially in registration with the projecting portions of the downstream member; an angular coincidence setting assembly connected to the failure-revealing part and imparting relative rotation between facing portions of the upstream and downstream members, a phase shifter assembly connected to activate an angular guide member for imparting the relative rotation to the facing portions of the upstream member and of the downstream member; and an axial-engagement assembly connected for actually engaging a motion transmission connection and arranged to couple the projecting and concave portions of the upstream member with the complementary projecting and concave portions of the downstream member when they are substantially in coincidence, wherein the angular coincidence setting assembly is automatic and comprises: a mechanical tension part arranged to act, in an event of the failure-revealing part being activated, to apply a tension on the upstream member substantially along a drive axis of the approach part and in an opposite direction to a direction to the approach displacement, a constraining part constraining the upstream member in rotation with at least one mechanical angular guide element arranged to co-operate with the tension part in order to obtain said constraint, the mechanical angular guide element integrated with the angular guide member to define a single piece, and a phase-shifter for shifting the upstream member relative to the downstream member under drive from the tension part, the phase-shifter comprising a reference that is stationary in rotation relative to the mechanical angular guide element, said angular guide member being slidable against the stationary reference in order to shift a phase of the upstream member.