Fastener having a self-locking attaching device to a vehicle body part

A system for securing an accessory vehicle part or element to a vehicle body part, comprising a slot thoroughly obtained through the body part and a fastener provided, at a first end thereof, with an attaching device to the body part and, at a second end opposite to the first, with a retaining device for the accessory part or element;

• wherein the attaching device comprises a shank thoroughly accommodated with a clearance through the slot;
• a hammer-like head shaped so as to be able to be inserted through the slot up to immediately under an edge thereof, the head being carried by a first end of the shank so as to overhangingly extend from both sides of the shank, perpendicularly to a symmetry axis of the shank;
• and an elastically deformable, suction-cap-shaped flange carried by the shank on the side opposite to the head, at a predetermined distance therefrom;
• the head being designed to be arranged, in response to a rotation of the shank in the slot, in a first, introduction configuration, in which it is oriented parallelly to the slot, and in a second, locking configuration, in which the head is oriented perpendicularly to the slot and cooperates by interference under the edge of the slot with a consequent elastic deformation of the flange;
• characterized in that the shank carries two oblique, elastically deformable arms which overhangingly extend from both sides of the shank, in a direction perpendicular to the head and so as to move away from each other towards the flange, the arms being dimensioned so as to cooperate in use with the edge of the slot to be elastically deformed against the shank in the introduction configuration of the head in the slot, and then stretch to snappingly engage the slot when the head takes the locking configuration, so as to prevent any further relative rotation of the shank in the slot.