Anchor nut-cage fixing systems

Claim 1

An anchor nut-cage fixing system to be applied on a metal sheet from one of the faces of this metal sheet in order to receive bolts presented from the same face, comprising: a nut with wings for fitting into an elongate hole formed in the metal sheet; and a holding and guiding cage for mounting in said hole, said cage being formed by a moulded plastic material socket split longitudinally by windows through which the wings of the nut pass jointedly, said socket being connected to an external collar at one of its ends, and external bosses integrally moulded with this socket being provided for extending into the hole for angularly locking the socket after axial introduction thereof with the nut in said hole, after an angular displacement of 90° of the socket with the nut, wherein the fixing system further comprises a flat metal cap, jointedly covering the external collar, the cap being perforated so as to allow a bolt to pass through and having axially bent flanges whose axial height below the interface of the collar and the cap is equal to or slightly less than the thickness of the collar, wherein at least one of the flanges is bent slightly more than 90° so as to imprison the collar.