A child car seat with tensioning means of a car seat belt for constraining the child seat to the car seat

A child car seat (1) comprises a support (2) adapted to rest on a seat of the vehicle, with which a child containment portion (6) is associated, such support (2) having a base (3) resting on a cushion of the above mentioned seat and a backrest (4) adapted to rest against a seat backrest, lever-controlled (26) coupling and tensioning means being provided in said base (3) for coupling and tensioning a seat belt (15) of the car, to secure the child seat (1) to said seat, the backrest (4) of the support (2) having hooking means (18) for attachment of such belt. The coupling and tensioning means comprise a translating body (25) having a wedge-shaped end (45), which is adapted to slide within a wedge cavity (49) interposed between two opposed sliding portions (20, 21) of such base, said portions being movable transverse and perpendicular to the translating body (25) when the wedge-shaped end (45) of the latter penetrates the above mentioned wedge cavity (49), a part of the safety belt of the vehicle being placed between said cavity and said end, and being also associated with said sliding portions of the base, said belt being tensioned by insertion of said end (45) into such cavity (49) and by a movement of said portions away from each other, caused by such insertion.