Abstract: In this buckle, a stop device which locks a locking device in the closed configuration of the buckle is formed by a body in a single piece which has guiding and maintaining portions adapted to receive return springs for a buckle operating knob and the locking device. The stop device is advantageously made from a moulded plastics material having a fibre glass filler.

Abstract: In this buckle, a locking device retaining a latch attached to the belt comprises a tab which defines an abutment surface. The latter is adapted to cooperate with a complementary abutment surface of a support of the buckle when a tensile force is exerted on the belt which exceeds a predetermined value. The contact between the two abutment surfaces is opposed by the elastic deformation of certain parts of the buckle and in particular of a pivot pin of the locking device. The latter is maintained in position by spacer members provided between branches of the support and the locking device.