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| Merchandise display system and merchandise holder therefor |
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| Framework mounting structure |
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| Thermal insulating system particularly adapted for building construction |
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| Display rack |
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| Bottle holder |
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| Slatwall mounting device |
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| Elevated water tank floor and construction thereof |
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Mine roof supports
| Details |
Inventors: Park, Roy;
Assignee: Gullick Dobson Limited (Lancashire, GB2)
Primary Examiner: Corbin; David H.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein & Kubovcik
A mine roof support has a roof engaging canopy 23, a floor engaging base 12, and a hydraulic jack 24 acting between the canopy and the base for urging the canopy and the base apart. The hydraulic jack 24 is provided with at least two different locations, movement of the jack means 24 from one location to another location bringing about an alteration in the distance between the canopy and the base. The invention makes it possible to provide a hydraulic jack having a first working position in which the hydraulic jack is arranged in the optimum position to support a mine roof, and a second stowing position for transportation purposes. |
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DETAILED DESCRIPTION I claim: 1.
A mine roof support, comprising: a mine floor engaging base having a front, a rear and a longitudinal axis extending from said front to said rear; a mine roof engaging canopy; linkage means for pivotally connecting said base and said canopy; hydraulic jack means for urging said canopy upwardly into load bearing contact with a mine roof, said hydraulic jack means having upper and lower ends; upper pivotal connection means for permanently pivotally connecting said upper end of said hydraulic jack means to said canopy; first and second jack receiving means disposed in said base for receiving said lower end of said hydraulic jack means, said second jack receiving means being non-vertically aligned with said upper pivotal connection, said first jack receiving means being spaced from said second jack receiving means in the direction of said longitudinal axis and spaced from said upper pivotal connection by a distance which is shorter than the distance between said upper pivotal connection and said second jack receiving means, said hydraulic jack means being pivotally movable from a first mine roof load bearing position in which said second end is received by said first jack receiving means and said linkage means is in a substantially open configuration to a second transportation position in which said second end is received by said second jack receiving means and said linkage means is in a substantially closed configuration, the space occupied by said mine roof support in said second position being reduced substantially with respect to the space occupied by said mine roof support in said first position, whereby transportation of said support is facilitated.
2.
A mine roof support as claimed in claim 1, in which, in said first mine roof load bearing position, said hydraulic jack means is substantially vertical.
3.
A mine roof support as claimed in claim 1, in which said hydraulic jack means comprises at least two hydraulic jacks.
4.
A mine roof support as claimed in claim 1, and further including guide means for guiding said lower end of said hydraulic jack means towards said second jack receiving means
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