Mine roof supports
AssigneeGullick Dobson Limited
InventorTom C. Bithell
Life of this patent
Estimating the term…
Abstract
A self-advancing mine roof support comprising a floor engaging base 11, a roof engaging canopy 12, hydraulic jacks 19a, 19b to urge the base and canopy apart, and a linkage system located towards the rear of the support. The linkage system comprises an inclined shield member 22 pivotally connected to the canopy 12, and at least two links 23, 24 interconnecting the shield and the base. The jacks 19a, 19b, are located substantially halfway along the length of the base and extend substantially vertically from the base. There is a hydraulic jack 18 operable between the roof engaging canopy 12 and the linkage system to effectively counterbalance the projection on the canopy 12 which extends forwardly of the jacks 19a, 19b.
Claims12
A mine roof support, comprising:
- a mine floor engaging base having a front and a rear, said base including elongate spaced-apart floor engaging members extending parallel to one another from said front to said rear;
- a mine roof engaging canopy;
- first hydraulic jack means connected to said base and said canopy for urging said canopy upwardly into load bearing contact with said mine roof;
- connecting means extending between said two spaced apart floor engaging members for connecting said floor engaging members together, said connecting means being disposed behind said first hydraulic jack means towards said rear;
- linkage means at said rear of said base and disposed behind said connecting means for pivotally connecting said base and said canopy;
- second hydraulic jack means pivotally connected between said canopy and said linkage means and disposed behind said connecting means towards said rear for providing even distribution of load along said base;
- pivotal connection means connected to said canopy behind said connecting means towards said rear for pivotally connecting said second hydraulic jack means to said canopy.
Dependencies are inferred from the claim text.