Shield supports suitable for use in mines
US4607986A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1984 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Jul 19, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/0427
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A shield support, suitable for use in mines, comprising a floor-engaging structure which includes two sledge or like elements disposed side-by-side and spaced apart one from the other, a roof-engageable canopy, a shield mounted for pivotal movement with respect to the canopy and extendable and contractible prop means, carried by said elements, which are operable to adjust the height of the canopy. A pivotal guide linkage for supporting the shield from said elements includes links which are so connected to those elements and to the shield that the elements are rigidly coupled together only through the intermediary of those links and the shield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.