Automotive vehicle seat structure provided with an enclosure

The electronic box (5) which may be a DVD player or similar has side support pins (51,52) which engage with a longitudinal groove (61) in a support plate (6). Normally the box is retained in a fixed position by elastic members (62) which are integral with the groove profile. Under collision conditions when the antisubmarine cross member (3) moves forward the pins are freed and the box moves with the cross member