Abstract: The expanding and retracting ball- and broach-type lock comprises a striker plate (10), a catch bolt (20), a control device (30), an orientation device, a position detector, a safety device, a safety feature and, preferably, an ejector (80).The lock is mounted on a support (90) such as a seat subframe with a sole-plate (91) and a leg (92) which are articulated in order to rock relative to each other.Use for a removable of a "single-volume people-carrier type" vehicle seat.

Abstract: The seat made up of a seat (10) with a moving framework (11) for a cushion (12), of a backrest (20) with a moving framework (21) for a cushion (22), of an underframe (30) intended to make the seat rest on a floor, of an articulation (40), as well as of linkage rods (50) for automatically controlling the relative displacements of these cushions (12, 22) is noteworthy in that these linkage rods (50) comprise, on the one hand, a connecting rod (51) connecting, in articulated manner, one of the extremities of the framework (11) to the underframe (30) and, on the other hand, a connecting rod assembly (52) connecting, in articulated manner, the other of the extremities of the framework (11) to the framework (21) so that, in a first mode, when the backrest (20) passes from its normal position to one of its extreme positions, the seat part (10) retains, at least locally, a practically stationary position so that its cushion (21) faces the cushion (22) and that, in a second mode, when the backrest (20) passes from its