Child safety device adaptable on a vehicle

Adaptable child safety device for use on a vehicle and including a portable element (2) provided with:

• a tiltable arch-shaped handle (4) and a bearing surface (13),
• and a base (3) permanently fixed on a seat of the vehicle and provided with a support surface (11) for cooperating with the bearing surface (13),
• the portable element (2) and the base (3) being equipped with means for centering and positioning the portable element (2) on the base (3) and means for vertically locking the portable element (2) by means of rotation with respect to the base (3) between an engaging position and a locking position, characterised in that the vertical locking means include on one of the support (I 1) or bearing (13) surfaces an anchorage piece (15) provided with at least one locking branch (16) and on the other support (11) or bearing (13) surfaces, an opening (17) issuing into a cavity and having a passage section, said passage section of the opening (17) making it possible to insert the locking branch (16) through the opening (17) according to the engaging position and then bring the portable element (2) into the locking position by means of a relative rotation of the anchorage piece (15) with respect to the opening (17).