Mobile mine roof support system
US4307982A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1980 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | Mar 6, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/0095
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mobile self-propelled mine roof support system employing pairs of individually self-propelled roof support units movable along opposite ribs of a mine room to follow an advancing mine face. Each support unit comprises an elongated, wheel-mounted frame positioned along the adjacent rib. Pairs of vertical jacks are connected to opposite sides of the frame, being positioned loosely, and vertically movable, within oversize openings in brackets attached to the frame. A foot plate is universally pivotally attached to the lower ends of each pair of jacks and extends across the underside of the frame. A top-supporting canopy is universally pivotally attached across the upper ends of each pair of jacks and has an overhanging portion extending cantileverly into the room toward the opposite support unit. The jacks have external flanges engagable with the brackets. When the jacks fully retract the foot plate from the mine bottom upwardly against the underside of the frame, the entire assembly including the canopies is clamped rigidly between the brackets and the underside of the frame to lock the canopies to the frame for tramming. After the pairs of jacks press the foot plates downwardly ag…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.