Joyce K Gibbs

US Patent:

49626515, Oct 16, 1990

Filed:

Dec 4, 1989

Appl. No.:

7/445351

Inventors:

Joyce K. Gibbs - Grand Junction CO

International Classification:

E05B 7300

US Classification:

70 58

Abstract:

A theft prevention device for use on the mounting bolts of automotive audio equipment such as radios and tape players. The device includes a pair of uniquely designed nuts with each nut having an overall shape of a truncated cone with a top, base, and conical exterior surface extending between the top and base. In operation, the first nut of each pair is initially threaded onto one of the bolts of the audio equipment using a special key that mates into a recessed portion in the base of the first nut. The radio or tape player is then manipulated to extend the mounting bolts through holes in the car's dashboard with the planar base of the first nut of each pair facing the interior side of the dashboard. The second nut of each pair is then threaded onto each bolt also using a special key that mates into a recessed portion in the top of each second nut. Once in place, the radio or tape player is securely mounted to the dashboard with the base of the first nut covered to prevent access to its recessed portions to turn it with the special key or any other instrument.