Buckle for a safety belt

In a safety belt buckle for attaching a portion of a safety belt to retaining means by means of a tongue member forming a latch which is fixed to said portion of the safety belt to be attached, said buckle comprising a support for fixing to the retaining means and defining a rectilinear passage in which the latch may be inserted and which defines a sliding plane for the latch, locking means for locking the latch which are mounted on the support to pivot about an axis which extends in a direction parallel to the plane of the passage and which define at least a first abutment surface for retaining the latch and extending in a direction perpendicular to the plane of the passage and transversely in the passage in a locked position of the buckle, stop means, means for mounting the stop means on the support so that the stop means are movable in translation in the support in a direction perpendicular to said pivot axis of the locking means, the stop means being cooperative with the locking means for stopping the locking means from releasing the latch in one position of the stop means and releasing the locking means in another position of the stop means when opening the buckle, the locking means defining at least a second abutment surface for coming in contact with the stop means in said locked position of the buckle, an operating knob for opening the buckle and mounted relative to the support so as to be movable in the same direction as the stop means, the buckle further comprising return springs for respectively acting on the stop means and the locking means and the operating knob;

• the improvement wherein said stop means comprise a body which is in a single piece and defines guiding and maintaining means for said springs, said guiding and maintaining means extending from opposite sides of said body in a direction perpendicular to said pivot axis of the locking means, and said means for mounting the stop means on the support comprise two opposed slide portions of said body which extend in directions transverse to said direction in which the stop means are movable in the support, and two opposed openings defined by the support, into which openings said slide portions respectively extend, each of said openings having a first part for guidingly engaging said slide portions in operation of the buckle and a second part for allowing engagement of said slide portions in said openings when initially assembling the buckle.