Hammer for forming an undercut fastener driving slot

Details Hammer for forming an undercut fastener driving slot Hammer for forming an undercut fastener driving slot

1977-09-15

1979-07-10

Combs, E. M.

10 26, B23G 900, B21K 148

Patent

active

041603001

ABSTRACT:
An improved hammer used in the first step of a two-step method for forming an undercut fastener driving slot in the head of a fastener, such as a screw or bolt, that results in an arcuate, recessed high-torque driving slot with undercut slot sidewalls where each sidewall has a noncontinuous sphericity interrupted by an inverted and generally triangular planar surface.

REFERENCES:
patent: 2182092 (1939-12-01), O'Leary
patent: 2304704 (1942-12-01), O'Leary
patent: 2676510 (1954-04-01), Hodell
patent: 2677985 (1954-05-01), Vaughn
patent: 2954719 (1960-10-01), Vaughn
patent: 3354481 (1967-11-01), Bergere
patent: 3388411 (1968-06-01), Vaughn
patent: 3453972 (1969-07-01), Vaughn
patent: 3540342 (1970-11-01), Vaughn
patent: 4033003 (1977-07-01), Marroquin

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