Broken bolt extractor

Details Broken bolt extractor Broken bolt extractor

1990-06-13

1991-07-16

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Stud-removal and implacement

7158, B25B 1350

Patent

active

050314874

ABSTRACT:
A broken bolt extractor comprises a right-hand threaded shaft having a left-hand drill bit at its lower end, the bit superposed by a collet-spreading inclined surface. The shaft has an invertible collet threaded thereon. The collet tapers toward its lower end and carries thereon exterior left-hand threads and is longitudinally split and expandable. The upper end of the collet carries a drive head structured when the collet is inverted on the shaft to center the drilling as it engages the sides of an aligned opening in a mating flange.

REFERENCES:
patent: 4604917 (1986-08-01), Polonsky
patent: 4777850 (1988-10-01), Polonsky

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