초록 ▼

A self-drilling fastener from which objects may be hung, for use in a friable material with or without an underlying member at the point of use or in a semi-rigid material such as a hollow core door comprises an elongated body having a threaded exterior with separate threads for drilling into the me

A self-drilling fastener from which objects may be hung, for use in a friable material with or without an underlying member at the point of use or in a semi-rigid material such as a hollow core door comprises an elongated body having a threaded exterior with separate threads for drilling into the member, gripping the member, gripping the friable material and/or gripping the semi-rigid material. The fastener may further have a thread having a relatively small-diametered solid portion from which objects hang and an axially expanding angled portion for biasing the object toward the solid portion to stabilize and prevent the object from dislodging from the fastener.

대표청구항 ▼

What is claimed is: 1. A self-drilling fastener hanging an object, comprising:an elongated body having an axis, a threaded exterior having a root, a proximal portion, an intermediate portion, a distal portion, and a drilling tip generally opposite said enlarged head;said proximal portion having an a

What is claimed is: 1. A self-drilling fastener hanging an object, comprising:an elongated body having an axis, a threaded exterior having a root, a proximal portion, an intermediate portion, a distal portion, and a drilling tip generally opposite said enlarged head;said proximal portion having an axial length and threads adapted for gripping a friable material, said threads having a root diameter, a crest diameter at least about twice said root diameter and a thread height;said intermediate portion having an axial length and threads adapted for gripping a member underlying said friable material, said member having a hardness greater than a hardness of said friable material, said intermediate portion threads having a crest diameter substantially smaller than said crest diameter of said proximal portion thread and a thread height substantially smaller than said thread height of said proximal portion thread;said distal portion having an axial length and threads for drilling into said member, a root that tapers toward said drilling tip, said distal portion threads having a crest diameter substantially smaller than said crest diameter of said proximal portion thread and a thread height substantially smaller than said thread height of said proximal portion thread;a flange proximate a rear end of said proximal portion thread, said flange having a diameter larger than said proximal portion crest diameter; anda head extending rearwardly from said flange, said head having an angled underside expanding outwardly from said flange toward a rear surface and a generally axially extending portion proximate said flange;