Masonry drilling tool
US7137461B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 2003 |
| Grant date | Nov 21, 2006 |
| Priority date | — |
| Expiry date | Jun 1, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/445
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A masonry or rock drilling tool suitable for use with a rotary hammer has a drilling head (4, 104) at a forward end of the tool. A forwardly extending cutting plate (6, 106) is fitted or formed on the drilling head (4, 104). First and second opposing axially extending channels (36, 38, 136, 138) are formed on the circumferential periphery of the drilling head. The tool has a clamping shank (2, 102) at a rearward end of the tool suitable for fitment within a tool holder of a rotary hammer. An intermediate helical conveying portion (10, 110) extends between the drilling head and the clamping shank. The intermediate helical conveying portion has at least four helically extending flutes (14a–d, 114a–d) separated by corresponding helically extending webs (12a–d, 112a–d). The first of the axially extending channels extend axially rearwardly from a forward facing face of the drilling head into two of the four flutes. The second of the axially extending channels extend axially rearwardly from the forward facing face of the drilling head into the other two of the four flutes. Conveying properties of the tool are substantially enhanced by having each axially extending channel leading into tw…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.