Fastening means for rearview mirror in automobile interior

Claim 1

A fastening means for a rearview mirror in an automobile body, which comprises a fastening base integrally formed at the basal end of an arm for supporting the rearview mirror, a fixing member made of a synthetic resin, and a setscrew adapted to secure said fixing member to the automobile body, said fixing member being provided with a tubular screw-receiving portion and a domelike flange-shaped engaging head portion extended from the peripheral surface of said screw-receiving portion, said engaging portion on the side opposite to the tubular portion being convex and having an underlying peripheral surface engageable with said base, said engaging head portion being provided with thin-walled portions for enabling said flange shape of the engaging portion to be broken under an impact, said thin walled portion comprises an annular groove encircling said tubular member and a plurality of grooves radiating outwardly therefrom, said fastening base being provided with a perforation for permitting insertion therein of the screw-receiving portion of said fixing member thereby enabling said engaging portion to come into fast engagement with the edge of the perforation, and said setscrew being adapted to be passed through the hollow part of said screw-receiving portion and driven helically into the automobile body, whereby said fastening base is attached fast to the automobile body through the medium of said fixing member.