Cutting plate for a drill bit
US7225890B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2004 |
| Grant date | Jun 5, 2007 |
| Priority date | — |
| Expiry date | Feb 3, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23B2251/50
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An auxiliary cutting plate (10) for a multi-cutting plate drill bit (2) has a body (44) for fixing into a slot in the drill bit (2) and a profiled tip (46). The body (44) has a central longitudinal axis and the profiled tip (46) protrudes from one end of the body (44). The profiled tip (46) has a cutting edge (62) defined by a transition between a rake face (64) and a relief face (66). The rake face (64) and the relief face (66) each slope axially rearward from opposite sides of the cutting edge (62). The angle of inclination θ of at least a portion of the rake face (64), measured from a plane perpendicular to the longitudinal axis, decreases with increasing distance from the cutting edge (62).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.