Tool for extracting broken bolts and the like

Details Tool for extracting broken bolts and the like Tool for extracting broken bolts and the like

1993-01-28

1993-10-12

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Stud-removal and implacement

7158, B25B 1350

Patent

active

052515168

ABSTRACT:
The tool includes a central section having a left-hand drill bit section at one end and an extraction section at the other. The extraction section tapers toward its distal end and is formed with left-hand threads on the exterior of the taper. The distal end is chamfered at an angle more abrupt than the taper so that the chamfer intercepts the threads and so that the threads rise outward in a short axial distance and are able to bite into the margins of a shallow hole drilled in the bolt remnant by the bit section.

REFERENCES:
patent: 2062383 (1936-12-01), West
patent: 2641948 (1953-06-01), Braendel
patent: 5031487 (1991-07-01), Polonsky

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