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US 4,030,308 AGranted
Mine roof supports
AssigneeFletcher Sutcliffe Wild Limited
InventorsPhilip Dudley, Lewis Robert Bower, Malcolm Wake
Life of this patent
Estimating the term…
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AssigneeFletcher Sutcliffe Wild Limited
InventorsPhilip Dudley, Lewis Robert Bower, Malcolm Wake
Estimating the term…
A mine roof support comprises at least one pair of hydraulically extensible chock legs connected at upper ends in articulated manner between one or more roof beams of the support and connected at lower end in articulated manner to one or more base members of the support, a rigid yoke located at a position spaced from the base member(s) between and connecting either the pair of chock legs, the yoke containing between the chock legs a projecting pin secured in a bearing attached to the yoke, or one of the pairs of chock legs, the yoke containing two projecting pins each pin being secured in a bearing attached to the yoke, and the or each pin having a lateral base contained at one side between abutment surfaces secured to the base member(s) and at the other to one end of a load applying means, the other end of the load applying means being supported from the base member(s).
A mine roof support comprising roof beam means, base member means, and a pair of hydraulically extensible chock legs connected at upper ends thereof in articulated manner to said roof beam means and connected at lower ends thereof in articulate manner to said base member means, and rigid yoke means spaced from the base member means between and connecting together said pair of chock legs, the yoke means containing projecting pin means secured in bearing means attached to the yoke means, said pin means having lateral base means, one side of said lateral base means contained between abutment means secured to the base member means, the other side of the lateral base means secured to one end of a permanent load applying means, the other end of the permanent load applying means being supported by the base member means, said permanent load applying means permanently loading said lateral base means against said abutment means.
Dependencies are inferred from the claim text.