Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends
Patent
1987-05-15
1989-05-09
Gall, Lloyd A.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Bulged by axially contracting ends
411 38, 411908, F16B 1310
Patent
active
048284394
ABSTRACT:
A screw anchor including a four-legged compressible shank whose normal shape is diamond-like, the front legs of the shank being joined together by a front apex hinge, the rear legs being joined to the front legs by side apex hinges. The rear legs terminate in feet whose adjacent soles normally assume the form of an inverted V-inlet. A socket whose bore lies in axial registration with a hole in the front apex of the shank is secured by a pair of normally outstretched resilient webs to the respective rear legs. To install the anchor, its side apex hinges are manually compressed to collapse the shank into a tongue which is then inserted through a hole drilled in the wall until the socket is seated therein and the shank which is now behind the wall resumes its diamond-like shape. Then a screw for holding the fixture against the wall is inserted in the socket bore and turned therein until its tip is intercepted by the inlet which is dilated thereby to admit the screw. As the turning screw continues to advance, its crests engage the soles of the feet to force the rear legs apart and in doing so compels the shank to now assume a triangular shape. At the conclusion of screw advance, its tip is threadably received in the hole of the front apex to create behind the wall a triangular truss in which the screw forms a central strut.
REFERENCES:
patent: 1295734 (1919-02-01), Greubel
patent: 2396501 (1946-03-01), Gibson
patent: 2610013 (1952-09-01), Gibson
patent: 3143916 (1964-08-01), Rice
patent: 3385156 (1968-05-01), Polos
patent: 3888156 (1975-06-01), Fima
patent: 4152968 (1979-05-01), Lassine
patent: 4274324 (1981-06-01), Giannuzzi
Brueske Curtis B.
Ebert Michael
Gall Lloyd A.
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