Chisel for removing damaged bolts, nuts and screws

Details Chisel for removing damaged bolts, nuts and screws Chisel for removing damaged bolts, nuts and screws

1988-04-04

1989-10-24

Schmidt, Frederick R.

Cutlery

Cutting tools

Chisel

30168, 81 532, B26B 300

Patent

active

048752894

ABSTRACT:
A chisel for rotationally disengaging a threaded bolt, nut or screw, has at one end thereof a cutting edge for cutting into and penetrating a surface of the bolt. The chisel further includes a first chisel face terminating at the cutting edge of the chisel, and a stop face positioned away from the cutting edge with the first chisel face disposed between the stop face and the cutting edge. The stop face is at an angle of about 90 degrees or less with respect to the first chisel face. The cutting edge has a width that is about equal to or greater than the distance between the stop face and the cutting edge. The stop face prevents further penetration of the cutting edge into the bolt beyond the stop face so as to provide for application of rotational force to the bolt by the chisel without further penetration of the cutting edge into the bolt.

REFERENCES:
patent: 906040 (1908-12-01), Lucas
patent: 975677 (1910-11-01), Clark
patent: 1004193 (1911-09-01), Plaisted
patent: 1020040 (1912-03-01), Jenkins
patent: 1041440 (1912-10-01), Decker
patent: 1093255 (1914-04-01), Carnes
patent: 1179680 (1916-04-01), Tallyn
patent: 1598458 (1926-08-01), Sullivan
patent: 1785847 (1930-12-01), Valentine
patent: 2622466 (1952-12-01), Vanden Bos et al.
patent: 2750821 (1965-06-01), Hilsinger
patent: 4144868 (1979-03-01), Heitbrink
patent: 4713990 (1987-12-01), Poling

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