Safety screw

Details Safety screw Safety screw

1993-07-20

1994-07-05

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Headed fastener element with nut, washer, securing means or cap

Penetrating pin securing means

411140, 411321, 411948, F16B 1500, F16B 3906

Patent

active

053262077

ABSTRACT:
A screw having a threaded shaft, a head on the shaft and means to permit rotation of the screw. There is a longitudinal slot extending along at least a portion of the threaded shaft to receive a locking member. The invention has a particular application in a wood screw and the locking member is, preferably, a flat body having a sharpen tip. Using the invention a wood screw may be secured against vandalism.

REFERENCES:
patent: 324768 (1885-08-01), Hunt
patent: 793269 (1905-06-01), Black
patent: 824017 (1906-06-01), Herdle
patent: 922543 (1909-05-01), Truston
patent: 1156811 (1915-10-01), Prince et al.
patent: 1184173 (1916-05-01), Gehring
patent: 1829293 (1931-10-01), Olson
patent: 3295579 (1967-01-01), Medal
patent: 3908235 (1975-09-01), Telliard et al.
patent: 4572039 (1986-02-01), Desjardins

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