Fastening clips for trim panels particularly for motor vehicles

A fastening clip for upholstered covering elements in particular motor vehicle trim elements, the fastening clip having a flat, disc-shaped retainer head extending perpendicularly to the clip axis, a central circular neck having a length corresponding to the thickness of a trim element, a thin disc-shaped sealing collar disposed parallel to the retainer head and retention elements attached to the latter, the retention elements consisting of at least two mutually oppositely disposed resilient arms which cooperate through detent shoulders with a locating hole in a vehicle body panel characterized in that the sealing collar is adjoined by a central rectangular shank connected through a deliberate frangible point to a supporting disc of part circular shape on whose underside two clip arms extend parallel to the clip axis and away from a supporting disc, these arms having substantially rectangular cross sections and being formed in such a fashion that they can be inclined, the other ends of these arms being articulated through integral hinges to spreader arms extending back substantially parallel to the clip axis to the supporting disc, these spreader arms having rectangular cross sections and being articulated through integral hinges to an end of the shank which extends downwards beyond the deliberate frangible point, the shank exhibiting at the top of its transverse sides detent grooves which cooperate with the break edges, these being designed as detent edges, of the deliberate frangible point.