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US 4,102,140 AGranted
Self-advancing mine roof supports
AssigneeGullick Dobson Limited
InventorArchelaius Dawson Allen
Life of this patent
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AssigneeGullick Dobson Limited
InventorArchelaius Dawson Allen
Estimating the term…
The invention is concerned with mine-roof supports, especially self-advancing mine-roof supports and provides a support comprising a base, a shield inclined downwardly and rearwardly towards the rear of the base and pivotally attached to said base, a roof-engaging canopy pivotally attached to an upper part of the shield, hydraulically; extensible prop means operatively positioned between the base and said shield, and hydraulically-extensible prop means operatively positioned between the base and the canopy. In some preferred embodiments of the invention the shield is a completely non-roof-engaging member and the pivotal connection between the shield and the baseis such that raising and lowering of the shield, by the prop means between said shield and the base, does not involve material angular displacement of said prop means. The pivotal connection between the canopy and the shield conveniently includes a debris excluding joint between said canopy and shield. The space between the prop means supporting the shield and the prop means supporting the canopy is generally designed to provide a safe walkway for miners. The forward end of the canopy may be provided with an extensible and retractable extension bar and/or with a mineral-face-supporting sprag or plate. The support may have a side anti-flushing shield at at least one of its sides and said anti-flushing shield may be extendable and retractable laterally with respect to the support.
A mine roof face support system comprising a plurality of self-advancing mine-roof supports in a row in front of a mine-face, each said mine-roof support being coupled to a face conveyor running transversely of the row of supports and including ram means for advancing that support relative to the face conveyor and the face conveyor relative to that support, and each said mine-roof support comprising a one-piece rigid base located rearwardly of said face conveyor, a roof-engaging canopy extending over the face conveyor and a forward part of the base, a shield inclined upwardly and forwardly from the rear of the base to the rear of the canopy, first pivot means coupling an upper part of the shield to the rear of the canopy, second pivot means coupling a lower part of the shield to the rear of the base, first hydraulically extensible prop means operatively positioned between said base and said shield, and second hydraulically extensible prop means operatively positioned between said base and said canopy, the first and second hydraulically extensible prop means being spaced to afford between them a covered access running parallel with and rearwardly of the face conveyor, and the first pivot means including a linkage prescribing movement of the lower part of the shield over the base to maintain a constant vertical canopy tip position.
Dependencies are inferred from the claim text.