Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1994-04-29
1996-03-26
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
F16B 1306
Patent
active
055015573
ABSTRACT:
A screw fastener helps secure a tapping screw easily and strongly to a wall. A starting hole is formed in a wall. The trunk of the screw fastener is inserted into the starting hole. The trunk has such a shape that it comes into contact with the inner surface of the wall defining the starting hole. A tapping screw is driven into the screw fastener thus inserted in the starting hole. The threads on the screw will bite into both the wall and the trunk so that the screw will be rigidly fastened to the wall.
REFERENCES:
patent: 2384918 (1945-09-01), Houk
patent: 2936014 (1960-05-01), Kraus
patent: 3279301 (1966-10-01), Fischer
Saether Flemming
Wakai & Co., Ltd.
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