Roof support suitable for use in mines
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United States of America Patent
Stats
-
Apr 23, 1985
Grant Date -
N/A
app pub date -
Mar 27, 1984
filing date -
Apr 16, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A roof support, suitable for use in mines, includes a roof-engageable canopy comprising a main portion and an extension portion pivotally-connected to the main portion. Actuator means is carried by the main portion and arranged to effect sliding movement of a wedge member. This member has a wedging face which is co-operable with a complementary face formed on a part of the extension portion which projects substantially beyond the pivotal connection of the extension portion to the main portion and in the direction towards the actuator means. The sliding movement of the wedge member effects tilting of the extension portion with respect to the main portion.
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