Advancing support
US4129990A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1977 |
| Grant date | Dec 19, 1978 |
| Priority date | — |
| Expiry date | Jan 25, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/0013
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An advancing support for providing a continuous propping, particularly for providing a continuous propping of mine galleries or like passageways, comprising at least two carriages for articulated tracks, each of said carriages including a beam having rounded ends and an articulated track closely surrounding the beam mounted for sliding friction on the beam, each of said beams being divided into spaced-apart longitudinal elements, a connecting element pivotally attached to each of said longitudinal elements for joining them together, said carriages being disposed one above the other to be applied respectively against the floor and roof of a gallery; at least one jack attached to the connecting element of the upper carriage and the connecting element of the lower carriage thereby joining said carriages together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.