Broken bolt extractor

Details Broken bolt extractor Broken bolt extractor

1988-04-11

1989-05-23

Meislin, Debra

Tools

Wrench, screwdriver, or driver therefor

Stud-removal and implacement

294264, 408115R, B25B 1350

Patent

active

048319023

ABSTRACT:
A tool and method for extracting a broken bolt shank, stud or other threaded member from a mating tapped hole is described wherein a segment of threaded rod having a plurality of off-axis longitudinal holes therethrough is threaded against or otherwise held in axial abutting relationship with the end of the broken bolt shank to be removed, alignment holes are drilled into the shank using the threaded rod segment as a guide, an alignment pin is inserted through each alignment hole to pin the threaded rod segment to the shank, and the shank and threaded rod segment are simultaneously backed out of the tapped hole by applying torque to the segment using one or a pair of nuts locked on the threaded rod segment or using a screwdriver wrench engaging one end of the threaded rod segment.

REFERENCES:
patent: 1227391 (1917-05-01), Cooper
patent: 2165485 (1939-07-01), Jackman
patent: 2281164 (1942-04-01), Maling
patent: 2547986 (1951-04-01), Dermark
patent: 2670639 (1954-03-01), Flowers et al.
patent: 2684526 (1954-07-01), Hoover
patent: 2686447 (1954-08-01), Vock et al.
patent: 2744311 (1956-05-01), Nipken et al.
patent: 2744312 (1956-05-01), Conger

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