Sheet metal nut with yielding retainer

Claim 1

IN A SHEET METAL NUT HAVING BIFURCATED SHAPE WITH A PLATE PART PROVIDED WITH A THREADED COLLAR, A RETAINER LEG HAVING AN OPEN FOR PASSAGE OF A SCREW TO ENGAGE THE THREADS OF THE COLLAR, AND A BEND CONNECTING SAID PLATE PART AND LEG, AND ADAPTED FOR BEING MOUNTED ON A PANEL HAVING A HOLE THEREIN BY WITH THE PLATE PART ENGAGED THE PANEL ADJACENT SAID HOLE WITH THE PLATE PART ENGAGED WITH ONE SIDE OF THE PANEL AND THE RETAINER LEG WITH THE OPPOSITE SIDE, (A) FLEXIBLE RETAINER MEANS SHEARED FROM SAID RETAINER LEG AND BENT INWARDLY TOWARD THE MENTIONED PLATE PART, SAID RETAINER MEANS BEING ENGAGED AND FLEXED BY THE PANEL TOWARD THE PLANE OF THE RETAINER LEG DURING MOUNTING MOVEMENT OF THE NUT AND, WHEN ACHIEVING REGISTER WITH THE HOLE IN THE PANEL, AUTOMATICALLY FLEXING BACK TO ITS INWARDLY BENT POSITION AND INTO SAID PANEL HOLE, THEREBY EFFECTING SECUREMENT OF SAID NUT TO THE PANEL, (B) SAID RETAINER MEANS COMPRISING AN APPROXIMATELY SEMI-CIRCULAR PORTION HAVING INTEGRAL HINGE CONNECTIONS WITH SAID RETAINER LEG AND PARTLY AROUND SAID OPENING IN SAID LEG, SAID SEMI-CIRCULAR PORTION BEING PROVIDED WITH A BENT PART THAT IS SUBSTANTIALLY CENTRALLY DISPOSED BETWEEN THE HINGE CONNECTIONS, (C) THE RETAINER LEG HAVING A SHEAR EDGE THAT IS EXPOSED WHEN THE RETAINER MEANS IS SHEARED AND BENT INWARDLY TOWARD THE PLATE PART, (D) THE HINGE CONNECTIONS BEING ON THE SIDE OF THE OPENING IN THE RETAINER LEG AND CLOSER TO THE FREE END OF THE RETAINER LEG, (E) THE MENTIONED SEMI-CIRCULAR PORTION EXTENDING FROM THE HINGE CONNECTIONS IN THE DIRECTION OF THE BEND THAT CONNECTS THE PLATE PART AND THE RETAINER LEG, AND (F) THE BENT PART ON THE SEMI-CIRCULAR PORTION BEING AT AN ANGLE OPPOSITE TO THE ANGLE OF THE RESILIENT PORTION, SUCH THAT SAID PART IS SUBSTANTIALLY PARALLEL TO THE RETAINER LEG WHEN THE SEMI-CIRCULAR PORTION OF THE RETAINER MEANS ABUTS SAID SHEARED EDGE.