Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation
Patent
1977-08-03
1982-08-31
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Pilot end having means enhancing fastening or installation
408224, F16B 2500
Patent
active
043470270
ABSTRACT:
A drilling and reaming screw is disclosed having a drill tip and a pair of frangible wings as a reaming means. The frangible wings are formed from the shank so that they include inner portions within the shank diameter and outer portions outside the shank diameter. Upon reaching a workpiece of predetermined hardness, the outer portions are adapted to break off from the shank along a line lying entirely beneath the surface of the shank such that no harmful protuberances remain.
REFERENCES:
patent: 2468874 (1949-05-01), Hawkins
patent: 3045523 (1962-07-01), Reed
patent: 3358548 (1967-12-01), Dyslin
patent: 3699841 (1972-10-01), Lanius
patent: 3869219 (1975-03-01), Wilson et al.
patent: 3982464 (1976-09-01), Sygnator
Beart Robert W.
Buckman Thomas W.
Holko Thomas J.
Illinois Tool Works Inc.
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