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US 4,601,625 AGranted
Self drilling threaded insert for drywall
AssigneeIllinois Tool Works Inc.
InventorsRichard J. Ernst, Francis C. Peterson, Melissa L. Sledz
Life of this patent
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AssigneeIllinois Tool Works Inc.
InventorsRichard J. Ernst, Francis C. Peterson, Melissa L. Sledz
Estimating the term…
A threaded insert for drywall having an externally threaded portion and an unthreaded drilling portion of generally equal lengths. The insert is adapted to be installed in a single step with the use of a hand powered screwdriver. A low profile flange at the upper end spaced a distance from the threads allows the insert to be installed flush with the surface of the drywall. Two embodiments are disclosed, one of molded zinc and the other of plastic material. Both embodiments include a drilling portion which can be deflected laterally upon the insertion of a screw therethrough, allowing the use of a single moderate length screw for attaching articles of various thicknesses. The insert eliminates the need to pre-drill a hole with a separate tool.
An anchor for use in friable material comprising a generally hollow cylindrical body with a flanged end and a driling end, said body having an exterior thread disposed thereon, said drilling end including notch means formed in said drilling end adjacent said body for allowing passage of an elongated fastener through and beyond said drilling end, said notch means creating a section of reduced cross-sectional area in said drilling end to reduce resistance of said drilling end to bending.
An anchor for use in friable material comprising a generally hollow cylindrical body having a central bore and an exterior threaded portion having a predetermined axial length, a drill tip at one end of said body and a flange at the other end thereof, said drill tip comprising a generally flat pointed extension of said body, said tip including a spoon-like indentation communicating with said bore, said drill tip having an axial length generally equal to the axial length of the threaded portion of said body.
An anchor for use in friable material comprising a generally cylindrical body with a flanged end and a drilling end, said flanged end having torque transmitting surfaces therein, an external thread on a portion of said body, said portion having a crest diameter generally twice its root diameter, and said portion having a predetermined axial length, a drill tip depending from said body having an axial length generally equal to the length of said threaded portion, said tip comprising a generally flat blade having an opening at one end thereof communicating with said bore, said blade having a maximum lateral dimension generally equal to said root diameter, said blade having a free end including three spikes, one of said spikes being centrally located with respect to the axis of said body, the other of said spikes having points spaced at a distance generally equal to said root diameter, the centrally located spike being further from said body than said other spikes, said blade being frangibly connected to said body.
Dependencies are inferred from the claim text.