Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends
Patent
1979-05-16
1981-06-23
McCall, James T.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Bulged by axially contracting ends
411 29, 411 42, 411 49, 411 51, 411 57, 411 71, 411386, 411 15, 411340, 411908, F16B 3504
Patent
active
042743249
ABSTRACT:
A plastic screw anchor for fastening fixtures and other objects to a hollow wall, the anchor including a four-legged diamond-shaped shank whose front legs are joined together by a front apex living hinge and whose rear legs are joined to the front legs by side apex living hinges, the ends of the rear legs defining a rear apex. Secured by a pair of normally outstretched resilient webs to the rear legs of the shank is a flanged socket whose bore lies in registration with an opening formed in the front apex hinge. The diamond-shaped shank is collapsible to form a tongue that is insertable in a hole drilled in the wall to accommodate the socket, the webs then reverting to their outstretched condition to cause the shank which is now behind the wall to recover its diamond formation. When a self-tapping screw is turned into the socket bore, it acts to thread the bore. As the screw proceeds beyond the bore, it compels the shank to assume the configuration of a triangular truss whose bottom chord is defined by the rear legs and is pressed against the inner surface of the wall, the truss having a central strut formed by the screw when it extends between the front apex and the socket.
REFERENCES:
patent: 761277 (1904-05-01), Wilbur
patent: 1106983 (1914-08-01), Steiner
patent: 3213746 (1965-10-01), Dwyer
patent: 3241420 (1966-03-01), Passer
patent: 3487746 (1970-01-01), Kapnek
Modern Plastics; May, 1965.
Ebert Michael
McCall James T.
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