Prop headboard
US5658099A · kind A · utility
6Cited by
12References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1994 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Sep 22, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D15/483
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The prop headboard is used to support an inflatable grout bag on the head of an elongate prop. The headboard has a timber frame which presents a planar support surface suitable for supporting the inflatable grout bag. Bag-retaining flaps made of flexible fabric material extend from opposite edges of the headboard. These flaps are folded over the grout bag and serve to centralise it on the headboard and to restrain it from rolling out sideways during inflation and thereafter. The invention also concerns a prop system in which the headboard is used, and a method of supporting a hanging wall in a mine working.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.