Self-drilling screw for layered flooring
AssigneeAll State Fastener Corporation
InventorBoyd J. Smith
Life of this patent
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Abstract
A system includes a flooring substrate having a hollow core, a support substrate supporting the flooring substrate, and a fastener engaging the flooring substrate to the support substrate. The fastener includes a head portion for receiving a screw driver configured to rotate the fastener about an axis and a shank portion extending along the axis from the head portion to a distal end. The shank portion includes a threaded section between the distal end and the head portion, and an unthreaded section between the distal end and the threaded section. The threaded section has an outer threaded edge extending helically along the shank portion. The unthreaded section has a length along the axis that is at least a depth between the flooring substrate and the support substrate.
Claims9
A system comprising:
- a flooring substrate having an upper layer and a lower layer with a hollow core disposed between the upper and lower layers, wherein an unsupported drilling depth is defined between an upper surface of the upper layer and an upper surface of the lower layer;
- a support substrate supporting the flooring substrate;
- and
- a fastener engaging the flooring substrate to the support substrate, the fastener comprising:
- a head portion for receiving a screw driver configured to rotate the fastener about an axis of the fastener;
- and
- a shank portion extending along the axis from the head portion to a distal end configured to pierce through the flooring substrate and the support substrate, the shank portion having (i) a threaded section between the distal end and the head portion, and (ii) an unthreaded section between the distal end and the threaded section,
- wherein the threaded section has an outer threaded edge extending helically along the shank portion;
- and
- wherein the unthreaded section has a length along the axis of the fastener that is at least equal to the unsupported drilling depth.
Dependencies are inferred from the claim text.