Temporary roof support cylinder
US5026218A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Nov 16, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G2025/047
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic temporary mine roof support cylinder is disclosed. The support cylinder includes an outer housing and a coaxial intermediate housing member and inner cylinder. A downwardly extending piston is provided between the outer housing and intermediate housing member. In addition, a sleeve piston is provided within the inner cylinder while an inner piston rod is extensible from the sleeve piston. Controls are provided for independently operating the lower cylinder and the upper cylinders. Additionally, a sequence/check valve ensures the timed operation of the upper cylinders. Due to the present design, each of the cylinders may be collapsed within the outer housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.