Importance

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Abstract

A device for bolting an article to a wall board, using a pre-drilled hole in the wall, is disclosed. The device comprises a volt, and an anchoring portion threadedly mounted to the bolt. This anchoring portion is resiliently deformable in one direction which allows it to pass one way through the hole and has a normal configuration wherein it grasps the inside surface of the wall board to hold the attached bolt against removal from the hole. The anchoring portion comprises a resilient, ribbon-like strip spirally wound into a cone-like configuration and resiliently held therein with inner and outer edge portions of the strip overlapping and in close mutual proximity. A nut for receiving the bolt is affixed to a first, inner end of the spirally wound strip and is held with its bore aligned with the central axis of the conical configuration. The anchor may be uncoiled when the turns of the spiraling strip are urged apart in one direction axially. However, the coiled anchor retains its coiled, conical configuration when it is compressed in the opposite direction, by virtue of holding engagement of the overlapping portions of the strip. The outer edge portion of the outermost turn of the coiled strip presents a generally circular load bearing region for engaging a planar surface.

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First Claim