Self-advancing support and control means therefor
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United States of America Patent
Stats
-
Jan 1, 1985
Grant Date -
N/A
app pub date -
Oct 13, 1983
filing date -
Oct 29, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A self-advancing support, suitable for use in mines, includes a cantilever which is extendible and retractable with respect to a main portion of the support, and a sprag which is so mounted on said cantilever as to be extendible and retractable with respect thereto. Means are provided for advancing the support with respect to a mineral face and further means are provided for ensuring that during advance of the support the sprag is maintained in an extended, mineral-face-engaging, condition while the main portion is moved with respect to the cantilever in the direction towards the face, thereby reducing cantilever extension.
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