Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Cap over the head
Patent
1989-09-21
1990-10-23
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Cap over the head
411396, 411910, 70232, F16B 1900, F16B 3300, F16B 4300
Patent
active
049647733
ABSTRACT:
A screw with an anti-theft safety head is suggested, which safety head is provided with a bore receiving a substantially cylindrically constructed tool extension part originating at the screw. At least two rotatably supported pins are arranged substantially parallel next to the bore in the anti-theft safety head, which pins are each rotationally fixed to a locking member. The locking members can be swung into an annular groove on the tool extension part by rotating the associated pin from its upper end, which upper end is accessible from outside and is constructed as an adjusting tool adapter segment. Only when all pins and locking members assume a very precisely defined position, it is possible to pull off the anti-theft safety head. The solid construction of the anti-theft safety head provides a novel anti-theft protection of the screw.
REFERENCES:
patent: 1812467 (1931-06-01), Blackmore
patent: 1877545 (1932-09-01), Wise
patent: 1912872 (1933-06-01), Trautner
patent: 2340864 (1944-02-01), Carpenter
patent: 3174383 (1965-03-01), Heil
patent: 3757550 (1973-09-01), Kayser
patent: 4288902 (1981-09-01), Franz
patent: 4574602 (1986-03-01), Furuse
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