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A self-drilling plastic anchor installable in a wall by means of a screwdriver, the anchor being adapted to receive a threaded fastener that serves to hold a fixture or other object against the wall. The anchor includes an externally-threaded shank section having an enlarged head that is engageable

A self-drilling plastic anchor installable in a wall by means of a screwdriver, the anchor being adapted to receive a threaded fastener that serves to hold a fixture or other object against the wall. The anchor includes an externally-threaded shank section having an enlarged head that is engageable by the screwdriver and a cavity to receive the fastener. Extending from the lower end of the shank section is a drill section that terminates in a point that lies on the longitudinal axis of the anchor. When the anchor is applied to the wall, the point penetrates its surface, so that the anchor may then be turned by the screwdriver about the point. The drill section is formed by a pair of cutting blades on opposite sides of the anchor axis and a pair of guide blades, each angled relative to a respective cutting blade. When the anchor is turned in, the cutting blades guided by the guide blades proceed to bore a hole in the wall, and when the shank section enters the hole, its bank is tapped by the threading of the shank section until the head thereof engages the surface of the wall to complete the installation. The fastener may then be screwed into the cavity of the shank section. The undersurface of the head has ratchet teeth formed therein which when the head engages the wall surface, the teeth grip this surface to resist turning out of the anchor.

대표청구항 ▼

A self-drilling anchor formed of synthetic plastic material and installable by means of a screwdriver in a hollow wall, said anchor comprising: (a) a shank section provided at its upper end with an enlarged head adapted to receive said screwdriver for turning the anchor into the wall, said shank sec

A self-drilling anchor formed of synthetic plastic material and installable by means of a screwdriver in a hollow wall, said anchor comprising: (a) a shank section provided at its upper end with an enlarged head adapted to receive said screwdriver for turning the anchor into the wall, said shank section having a tapered root, a spiral threading surrounding the root and having convolutions whose crests are of essentially the same diameter along substantially the full length of the root, and a cavity extending along the longitudinal axis of the anchor adapted to accommodate a threaded fastener for holding an object against the outer surface of the wall; and (b) a drill section attached to the lower end of the shank section and extending therefrom along said axis, said drill section having a pair of cutting blades on opposite sides of said axis and a pair of guide blades each angled relative to a respective cutting blade, whereby as the anchor is turned into the wall by the screwdriver, the cutting blades then bore a round hole whose bank is engaged by the guide blades to ensure circularity of the hole, and as the anchor continues to turn, the shank section enters the hole whose bank is then tapped by the threading until the head engages the outer surface of the wall to complete the anchor installation.