Hydraulic switching mechanism for longwall supports
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United States of America Patent
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-
Jan 20, 2009
Grant Date -
Mar 1, 2007
app pub date -
May 25, 2006
filing date -
Nov 29, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic switching mechanism for longwall supports. The present invention provides a hydraulic system that is controlled by its own pressure and may be adaptable to those currently in use so that life-threatening and costly faults cannot occur. With the present invention, the retrofitting of existing systems may be made possible without significant expenditure in modification.
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