Screw anchor clip

Claim 1

A screw anchor clip for use in a double D-shaped bore comprising a sheet metal stamping punched and formed to provide a continuous head portion, said head including a central aperture and a pair of oppositely extending tabs for overlying the peripheral margin of an aperture in the body of material having the bore adapted to receive said screw anchor clip, an upstanding annular collar formed about said aperture and having an internal diameter greater than a screw to be accepted therethrough, a pair of C-shaped spaced apart wall portions integrally connected from said head and each depending in quatrature to said tabs, said Cshaped wall portions having a configuration in cross section substantially identical to said double D-shaped bore and acceptable therein in close tolerance configuration, the ends of each C-shaped wall being spaced from and in opposition to the free ends of the other C-shaped wall, at least two pairs of diametrically opposed thread engaging members formed from struckout portions of said C-shaped spaced apart wall portions, each of said thread engaging portions having an axially disposed portion leading into an inwardly directed angularly disposed portion having a thread engaging terminating end and said angularly disposed portions being resilient to pressures of screw threads directed from said head end portion, whereby rapid initial insertion of screw is obtained by axial telescopic insertion of said screw into said screw anchor clip until the head of said screw comes into supportive contact with said flange encircling the aperture and final tightening and removal of the screw is accomplished by thread action between said screw and said thread engaging portions, at least one free edge of said C-shaped walls having barb means struck outwardly therefrom and facing said head, said barb means being resiliently distortable and engageable for initial retention of the clip in said bore, prior to insertion of said screw, each of said C-shaped walls at the end opposite the head being continuous to provide hoop strength to said wall.