Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1980-01-25
1982-01-19
Purser, Ernest R.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
E21D 2304
Patent
active
043114172
ABSTRACT:
A self-advancing, hydraulically powered mine roof support comprises a base means, a double-acting hydraulic advancing ram extending in the intended direction of advance of the support in use, the cylinder of the advancing ram being located towards the forward end of the support and the piston rod of the advancing ram being located towards the rearward end of the support, a lifting ram mounted on the support at or towards the forward end thereof and being operable on the periphery of the cylinder to lift the forward end with respect to the cylinder, the end of the cylinder remote from the piston rod being connectable to a pan of an armoured conveyor, and the advancing ram being connected to the support by an inclined link means pivotally attached to the base means and to the piston rod.
REFERENCES:
patent: 3748861 (1973-07-01), Groetschel
patent: 3990251 (1976-11-01), Wehner et al.
patent: 4139325 (1979-02-01), Bower et al.
Bower Lewis R. B.
Scarfe Arthur
Smith John C.
Fletcher Sutcliffe Wild Limited
Purser Ernest R.
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