Mine roof bolt assembly
US8894328B2 · kind B2 · utility
3Cited by
27References
20Claims
0Family size
Inventors
Key dates
| Filing date | Mar 17, 2012 |
| Grant date | Nov 25, 2014 |
| Priority date | — |
| Expiry date | Mar 17, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0086
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mine roof bolt assembly (10) comprises a bolt (20), a bearing plate (30), and a washer (40) situated between a ledge (24) of the bolt (20) and a lower face (33) of the bearing plate (30). The washer (40) includes an elbow (42), a radially inner portion (43) extending upward from the elbow (42), and a radially outer portion (44) sloping upward from the elbow (42). The elbow (42) engages an inboard location of the bolt ledge (24) so as to reduce stress on the flange (23) of the bolt (20).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.