Method of removing broken threaded fasteners

Details Method of removing broken threaded fasteners Method of removing broken threaded fasteners

1976-12-27

1977-11-15

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Shaping mating parts for reassembly in different positions

85 1L, 85 47, B23P 1902

Patent

active

040578909

ABSTRACT:
A method for removing broken fasteners so as to render the broken shank readily removable from a tapped hole in a machine part after a shear-type fracture of the fastener shank. In one illustrated form the fastener is a hexhead machine bolt having uniformly spaced slots cut into the shank from one end thereof to the other and filled with a lubricant material prior to installation. After a shear-type fracture a tool having axial projections at one end thereof mating with the slots is inserted into the interstices formed by the slots in the periphery of the sheared-off shank portion to force lubricant into the threads and to provide reaction surfaces to enable use of the tool to turn the shank portion out of the tapped hole. A second illustrated embodiment of the fastener shows an Allen head stud similarly slotted.

REFERENCES:
patent: 168357 (1875-10-01), Uster
patent: 2121197 (1938-06-01), Jackman
patent: 2288864 (1942-07-01), Whitehead et al.
patent: 2439692 (1948-04-01), McKay
patent: 2670639 (1954-03-01), Flowers et al.
patent: 2684526 (1954-07-01), Hoover
patent: 2744311 (1956-05-01), Nipken et al.

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