Anchor

Details Anchor Anchor

1991-10-21

1993-03-02

Lindsey, Rodney M.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

411 29, 411 55, F16B 2500

Patent

active

051904250

ABSTRACT:
A self-drilling anchor for insertion into a workpiece such as a drywall to secure an element to the workpiece comprises a drilling portion having substantially parallelo-gram configured blade means for drilling a bore of pre-determined diameter into the workpiece, and a threaded portion including a generally cylindrical body of a diameter substantially the same as the diameter of the bore. The body has thread means for tapping into the bore to secure the anchor in the workpiece. The body also has a section having portions comprising a tapered portion of the threaded body portion and rearwardly inclined portions of the blade means of substantially less diameter or lateral extent than the diameter of the bore joining the drilling and threaded portions. The section receives particulate dislodged from the workpiece by the drilling of the bore, thereby preventing accumulation of particulate impeding insertion of the anchor.

REFERENCES:
patent: 3316796 (1967-05-01), Young
patent: 4028987 (1977-06-01), Wilson
patent: 4601625 (1986-07-01), Ernst et al.
patent: 4900208 (1990-02-01), Kaiser et al.
patent: 5039262 (1991-08-01), Giannuzzi

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