Low torque wood screw
US5516248A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1994 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Sep 7, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B35/065
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A low torque fastener screw for securing a wooden workpiece to a substrate includes an elongated body defining a longitudinal axis and having an enlarged head formed on one end, an external pointed thread formed on an opposite end, an elongated unthreaded shank between the enlarged head and the threaded end, and a reamer formed at the juncture of the shank and thread. The reamer has a plurality of longitudinal cutting edges formed about its periphery which ream out the hole formed by the threaded end to a diameter larger than the shank, thereby reducing frictional resistance to rotation of the screw and optimizing the torque applied by the driving tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.