Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Having bore therethrough
Patent
1988-03-15
1989-11-07
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Having bore therethrough
411426, 411911, 10 27R, F16B 3500, F16B 3504
Patent
active
048787949
ABSTRACT:
A series of drywall screws are nested together and individually seated with a special driving tool after separation from one another. Each screw is hollow and has interior and exterior screw threads. One end of the screw has a hollow flat head and the body tapers downwardly to a bottom portion having a diameter less than half the diameter of the first end. A drill bit having an eccentric point drills a bore having a diameter greater than the diameter of the drill bit so that the bore operatively receives the screw.
REFERENCES:
patent: 321483 (1885-07-01), Burrows
patent: 446871 (1891-02-01), Lieb
patent: 1172406 (1916-02-01), Taylor
patent: 1925667 (1933-09-01), Kirton
patent: 3778089 (1973-12-01), Fredd et al.
patent: 3994516 (1976-11-01), Fredd
patent: 4507817 (1985-04-01), Staffeld
Hall, Jr. John W.
Mason, Jr. Joseph C.
Smith Ronald E.
Wilson Neill R.
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