Patent ID: 8827228

Claim:
A fastener device for fastening a load to a rail provided with a slideway that is defined by a bottom wall, two side walls, and a top wall including a succession of wide slots and of narrow slots, said fastener device comprising a base and two shoes suitable for being inserted in said wide slots and for co-operating with the top wall by shape interference in a narrow slot, said fastener device having: first and second slides, each slide having one of said two shoes for blocking said fastener device in elevation by shape interference with said top wall; and spacer means for spacing said first and second slides to move said first and second slides longitudinally in opposite directions; wherein the fastener device further comprises: a first slide shaft and a second slide shaft of said base, the first and second slides being arranged respectively on the first and second slide shafts of said base; detector means for detecting a rail and automatically controlling the spacer means to move each slide from an opening position in which a wide slot is in register with said slide to a locking position in which a narrow slot is in register with said slide; approach means for approaching said first and second slides to move each slide from the locking position towards the opening position; and blocking means for longitudinally blocking said base.