Retracting device for a safety belt

A retractor for a safety belt, in particular for an automobile vehicle, comprising means defining a support, a mandrel mounted to be rotatable relative to the support about an axis, the belt being wound around the mandrel, a return spring combined with the mandrel for biasing the mandrel to rotate in a direction for winding the belt onto the mandrel, locking means combined with the mandrel for preventing rotation of the mandrel, a rocker freely pivotably suspended from the support, an acceleration detector suspended on said rocker and responsive to acceleration exerted on said retractor so as to actuate said locking means upon detection of acceleration, a first pendular mass rigid with said rocker so as to offset the centre of gravity of said rocker below the axis of rotation of said mandrel whereby said first pendular mass maintains said rocker in a given position irrespective of variations of the attitude of said retractor, said retractor further comprising a bearing mounted on said support and coaxial with said mandrel, and wherein said acceleration detector is a pendular detector, said rocker comprising a triangular frame having an apex corner and a lower side below said apex corner, the frame being suspended by said apex corner, a horizontal ledge laterally extending from said lower side and carrying said acceleration detector, said horizontal ledge having a vertical extension constituting said first pendular mass.