Self drilling roof bolt
US6309159A · kind A · utility
15Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2000 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Oct 30, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0053
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An elongate roof bolt includes a bolt body having an axially extending central bore and defining a leading end. The leading end includes a pair of axially extending abutment elements formed by machining. Each abutment element includes an abutment face for engagement with a drill tip on opposite sides thereof, to transmit rotary forces during drilling. The drill tip extends across the leading end of the bolt body and is bonded to the abutment elements by welding, soldering or brazing. The bore opens out of said bolt bonded adjacent said leading end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.