Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Patent
1995-11-15
1998-11-10
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
411387, 411395, F16B 1304
Patent
active
058334157
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to improvements in the wall anchor, disclosed in my prior application Ser. No. 08/344,823, fully incorporated herein by reference, for securing a support fastener and, particularly, to a cylindrical wall anchor with an outer thread for threading into wall material such as dry wall, sheet rock and wood comprising the surface material of a hollow wall or similar structure.
In U.S. Pat. No. 5,308,203 and in the aforementioned prior applications, the distal or cutting end of the anchor is constructed to provide a circular cut in the wall in advance of the outer threads as the distal end of the anchor is press-turned into the wall. The anchors disclosed in U.S. Pat. No. 5,308,203 have through bores extending from the flanged end of the anchor to the open cutting end where opposed saw teeth extend from the periphery. The open end provides access to the bore for wall material that is displaced by the sawing action of the teeth as the anchor is rotated and pressed into the wall. The threads which preferably extend and diminish in size from the flanged end to closely adjacent the teeth act to assist in drawing the anchor through the wall as do the threads of a screw when rotated into material.
In application Ser. No. 08/344,823, incorporated herein by reference, hollow cylindrical anchors are disclosed which provide centering points at their distal ends. In one instance, a flat arrow-shaped drill bit straddles the open distal end of the anchor. In another instance, a centering finger extends from the inner surface of the bore adjacent a single cutter which extends from the periphery of the open end. In yet another instance, the single cutter extending from the periphery of the anchor is formed as a cowl with the tip brought to the anchor's axis.
While these anchors with centering points work well to center the cutting end of the anchor and to leave an open area to receive the material dislodged from the wall by the cutter into the bore, it has been determined that a cutter fashioned after a drill bit of a fluted construction is a preferable centering device. The problem, however, which presents itself is if such a drill bit is incorporated in an anchor of this type, access to the bore for the dislodged material is lost, and a purely drilling operation would then push the drilled material axially to explode from the inner surface of the hollow wall or jamb the anchor in a solid wall.
The invention disclosed in application Ser. No. 08/344,823, incorporated herein by reference, provides an anchor with a hollow cylindrical body which diminishes in diameter toward the distal cutting end in the form of a pointed dome with a centering tip disposed at the center axis of the anchor. A single cutter with a centering tip, fluted along the side, much like a drill flute is formed at the dome-shaped distal end of the anchor. The cutter extends integrally from the outwardly threaded, hollow, cylindrical proximal end of the anchor with its tip at the axis of the anchor and its flute extending inwardly and proximally from the tip to communicate with, as an extension of, the bore of the proximal end. The flute, which now provides access to the bore of the anchor for the material being dislodged from the wall, is defined at its outer lateral edges by the leading and trailing edges of the cutter. Because of the direction of the edges of the flute, the leading edge is a sawing and cutting edge rather than a drilling edge. To this end, the leading edge extends radially and proximally from the tip in a plane in common with the axis of the anchor and at its forward or distal end is distended along a part of its length extending from the centering point in a curved path first outwardly then inwardly where it meets and forms part of the distal end of the bore at the entering end of the thread of the proximal end of the anchor. This inward curvature provides rearward axial cutting of wall material which has not been cut by the forward distal end of the leading edge because of the lesser dia
REFERENCES:
patent: 126366 (1872-04-01), Wills
patent: 4601625 (1986-07-01), Ernst et al.
patent: 5098435 (1992-03-01), Stednitz et al.
patent: 5160225 (1992-11-01), Chern
patent: 5190425 (1993-03-01), Wieder et al.
patent: 5403137 (1995-04-01), Grun et al.
Lindsey Rodney M.
Titan Technology, Inc.
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