Mine gallery curtain and method
US6082828A · kind A · utility
Inventors
Key dates
| Filing date | Mar 28, 1997 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Mar 28, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21F17/103
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A curtain for defining a barrier in an underground passageway between a pair of spaced-apart pillars, comprising a bladder defined by a pair of flexible sheets joined together by a plurality of cords which define a cavity between the sheets and being open at a top edge thereof. The bladder is fastened to a ceiling of an underground passageway between a pair of spaced-apart pillars therein. A rigid foam is disposed within the cavity, being formed of a flowable hardenable material introduced into the cavity. A fire-retardant coating is applied to exposed surfaces of the bladder after the hardenable material has hardened. A method of closing gaps between pillars in mine galleries is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.