Wood decking screw
US9695860B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2013 |
| Grant date | Jul 4, 2017 |
| Priority date | — |
| Expiry date | Feb 18, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B35/065
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A screw for securing dense wood material has a head with a specially configured drive socket and an underside with an array of lobes. The lobes preferably have a left-handed orientation and have chamfered extremities. The shank is specially configured with an upper thread, an intermediate unthreaded portion and a lower thread which terminates with a half-point tip. In one embodiment, the upper thread major diameter is slightly smaller than the major diameter of the lower thread. The upper thread has a greater thread density than the lower thread. The upper to lower thread-per-inch density is preferably in the range of 1.3:1 to 1.7:1. The screw is specifically configured to assist in applications where there are wet fibers near the wood deck surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.