Mining roof support frame with base skids lifting device
US7476058B2 · kind B2 · utility
0Cited by
2References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 23, 2006 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Jul 12, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/0436
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosure concerns a mining roof support frame including at least one hydraulic lifting ram which is mounted on a bridging member connecting two base skids of the main frame, and which by way of a pressure-generated force can be extended downward against a walking bar of the walking unit of the mining roof support frame located between the base skids. In accordance with the disclosure, the base skids lifting device is connected with the bridging member such that it can pivot. With walking unit ram pivot pins withdrawn only on one side, the base skids lifting device can be pivoted out of the way about opposing pivot pins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.