Screw extractor

Details Screw extractor Screw extractor

1981-03-03

1983-06-28

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Stud-removal and implacement

279 42, 408173, B25B 1350

Patent

active

043899137

ABSTRACT:
A tool for use in removing broken or inoperative screw fasteners. The tool has a tubular-shaped extension at one end with cutting teeth projecting axially from the extension. The teeth can cut around a fastener when the tool is rotated in one direction to provide a stub end on the fastener over which the extension fits. The extension is then tightened on the stub end and teeth, extending radially inwardly from the extension, tightly grip the stub end so that the fastener can be unscrewed on reverse rotation of the tool.

REFERENCES:
patent: 192423 (1877-06-01), Elterich
patent: 1548835 (1925-08-01), French
patent: 1683796 (1928-09-01), Pearce
patent: 1848590 (1932-03-01), Willis
patent: 3735650 (1973-05-01), Weng, Jr.
patent: 4204308 (1980-05-01), Marling

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