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US 4,050,256 AGranted
Mine roof support control systems
AssigneeGullick Dobson Limited
InventorsReginald Andrew Phillips, Kenneth Darbyshire
Life of this patent
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Abstract
A control system for a self-advancing mine roof support includes function selection hydraulic valve means responsive to coded electrical signals from remote means for selecting a desired function, and means for comparing the coded signals with other signals representing the instantaneous function state of the valve means. Usually each of a plurality of supports incorporates the remote means of a neighboring support.
Claims16
A control system for at least one self-advancing mine roof support comprising:
- remote selection means for providing a plurality of different coded electrical signals each of which represents a different desired function of said support, means interconnecting said remote selection means with apparatus at said support, said apparatus comprising function selection pressure fluid valve means responsive to at least one of said coded electrical signals for selecting a desired function of said support, signal generating means coupled to said valve means for generating a similar coded electrical signal which represents the instantaneous function state of said valve means, and comparator means connected to receive said at least one coded electrical signal from said remote selection means and said similar coded electrical signal from said signal generating means for determining when said valve means corresponds to said at least one coded electrical signal from said remote selection means.
Dependencies are inferred from the claim text.