Expansion lock

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Description

FIG. 1 is a front elevational view of an expansion bolt showing my new design;

FIG. 2 is a side elevational view taken from the right of FIG. 1;

FIG. 3 is a rear elevational view;

FIG. 4 is a side elevational view taken from the left of FIG. 1;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view.

Referenced Cited
U.S. Patent Documents
2289785 July 1942 Hutchison
3213746 October 1965 Dwyer
3651734 March 1972 McSherry
4142440 March 6, 1979 Schefer
Patent History
Patent number: D259171
Type: Grant
Filed: Aug 31, 1978
Date of Patent: May 12, 1981
Inventor: Robert S. Wallace (Los Angeles, CA)
Primary Examiner: B. J. Bullock
Attorney: William W. Haefliger
Application Number: 5/938,400
Classifications
Current U.S. Class: D/8385; D/8387
International Classification: D0808;