Prop preloading apparatus
US5149228A · kind A · utility
7Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Jun 26, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D15/55
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The prop preloading apparatus comprises a frame and means for supporting the frame on an end of an elongate prop in a manner permitting at least limited swivelling movement of the frame relative to the prop about at least one axis transverse to the axis of the prop. The apparatus also includes a flexible preload bag which is inflatable with a settable substance and which is dimensioned to be supported by the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.