Roof support suitable for use in mines
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United States of America Patent
Stats
-
Oct 22, 1985
Issued Date -
N/A
app pub date -
Jun 21, 1984
filing date -
Aug 6, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A roof support suitable for use in mines comprises a main roof-supporting structure, a cantilever carried by the structure, an actuator and a link member through the intermediary of which the actuator is connected to one end portion of the cantilever for moving the cantilever between retracted and extended positions. The end portion of the cantilever has projections which come into engagement with an abutment when, upon advancing movement of the actuator, the cantilever reaches its fully extended position. The abutment and projections are so shaped that when they are in engagement they form pivot means about which the cantilever can be tilted. The link member is so formed and so connected to the cantilever that upon further advancing movement of the actuator the cantilever is caused to tilt about the pivot means into a roof-supporting position.
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Cited Art Landscape
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