Apparatus for protecting roof tray when gob-side entry retaining end support migrates
US10822949B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 17, 2019 |
| Grant date | Nov 3, 2020 |
| Priority date | — |
| Expiry date | Sep 17, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for protecting a roof tray when a gob-side entry retaining end support migrates is provided. The apparatus is mounted at a top end position of a hydraulic support, and includes a movable bearing mechanism, an automatic expansion/contraction connecting groove mechanism, and an active reset mechanism. The movable bearing mechanism includes two parallel belts and a plurality of rollers supporting the belts, and the rollers are mounted on and supported by a bearing mechanism. The automatic expansion/contraction connecting groove mechanism is two concave base plates fixed between the two belts, and the two concave base plates are spaced by a distance. The active reset mechanism includes two telescopic rods and reset springs sleeved on the telescopic rods, and the telescopic rod is connected to an end portion of the reset spring to form a synchronous mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.