F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/20, 85/30
F16B 13/06 (2006.01) F16B 13/08 (2006.01) F16B 13/12 (2006.01)
Patent
CA 1122831
ABSTRACT OF THE DISCLOSURE A removable and reusable plastic screw anchor for fastening fixtures and other objects to a hollow wall. The anchor includes a four-legged diamond- shaped shank whose front legs are joined together by a front apex hinge and whose rear legs are joined to the frong legs by side apex 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 re- cover 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. To remove the anchor from the hollow wall, one simply withdraws the screw to permit collapse of the truss. The same anchor may be inserted in its tongue configuration in a hole drilled in a solid wall, the screw then serving to dilate the legs to wedge the tongue in the hole.
325649
Giannuzzi Louis N.
Smart & Biggar
LandOfFree
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