Abstract: A lock including a lock bolt (12) equipped with a locking body (14) of cylindrical overall shape intended to be locked by snap-fitting into a locking orifice (16) of complementary shape made in a striker plate (18). The lock bolt (12) additionally includes an anti-hammer ring (76) surrounding a region of the locking body (14) which, when the lock bolt (12) is locked, is in contact with the periphery of the locking orifice (16). As a preference, the body (14) is equipped with a releasable snap-fitting mechanism including bearing limits (40) for axial bearing which are intended to interact with a first face (36) of the striker plate, and at least one retractable locking ball (42) intended to interact with a second face (38) of the striker plate. When the lock bolt (12) is locked, the anti-hammer ring (76) extends axially between the bearing elements (40) and the ball (42), lying adjacent to the first face (36) of the striker plate.

Abstract: The expanding ball-type locking pin device (30, 31, 33) is equipped with a control (40) which comprises a lever (42) which exhibits an operating hand grip (421) and an articulation (422) associated with a casing (20) to allow it to turn about an axis parallel to a given direction (.DELTA.) between an unlocked position and a locked position and which bears a link so as to be able to move the needle (33) between its two positions, and furthermore comprises a safety feature (51, 52, 53, 54) coupled to the lever (42) and intended to interact with an underframe (P) to prevent a seat from being tipped into the opened-out position as long as a lock bolt (30) is not locked onto a striker plate.

Abstract: The multi-position seat is fitted with linkage rod (50) which comprise a connecting rod assembly (51), a scissor-type stay (52), preferably a biasing urging element (53), as well as limit stops (54) and a stop-piece (55), a cam (56) and also a cam follower (57). These linkage rod provide the automatic control of the relative displacements of the seat part and backrest cushions during changes in their relative positions.