Mine roof support assembly
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United States of America Patent
Stats
-
Jul 10, 1990
Grant Date -
N/A
app pub date -
Nov 17, 1989
filing date -
Sep 21, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mine roof support assembly comprises a mine roof support having a first end adjacent to the mine face and a second end remote from the mine face, an advancing mechanism for advancing the roof support towards the mine face, and a base lifting mechanism. The base lifting mechanism includes two substantially parallel arm members pivotally connected to a base section of the mine roof support, and two lifting rams each of which acts between a respective arm member and the roof support. The lifting rams act on the roof support at a position which is nearer than the center of gravity of the roof support assembly to the second end of the roof support to pivot the roof support relative to a respective arm member and thereby lift the first end of the roof support clear of the ground. Also, an advancing ram of the advancing mechanism is connected to the arm members by an arrangement which provides some movement of the ram relative to the arm members in two mutually transverse directions.
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Family
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Cited Art Landscape
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