Bit for cutting drywall
US6758639B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2002 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Jul 1, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/89
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A drywall routing bit for cutting laterally in a drywall or sheetrock panel includes an elongated body terminating at one end in a tip for penetrating the panel. The bit includes a single helical flute which defines a cutting edge at a helix angle relative to said longitudinal axis of the bit of 36°-38°. The cutting edge of the flute is defined at a rake angle of 20°-26°. The fluted portion of the bit has a web thickness that is 60%-63% of the bit outer diameter, for a ⅛″ diameter bit. The tip of the bit includes angled chisel edges subtending an angle of 113°-123° and following a shallow S-shaped curvature relative to a plane including the subtended angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.