Precast roof bearing block
US4618290A · kind A · utility
Inventor
Key dates
| Filing date | Jun 27, 1983 |
| Grant date | Oct 21, 1986 |
| Priority date | — |
| Expiry date | Jun 27, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0086
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A precast roof bearing block, such as a mine roof bearing block, may have a substantially solid molded body provided with reinforcement. The body has an upper bearing surface and a generally parallel lower bearing surface. A lateral surface connects the upper and lower bearing surfaces. A hole passes through the body member extending from one bearing surface to the other and may be located at the central axis of the body. A first reinforcing member may take the form of an annular ring which is disposed close to the upper bearing surface and a second reinforcing member may take the form of an annular ring which is disposed close to the lower bearing surface. The body member may have a substantially frustoconical or dome shaped configuration. A modified embodiment facilitates angular positioning of the roof bolt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.