Roof cap assembly with supporting cylinders for roof support mec

Details Roof cap assembly with supporting cylinders for roof support mec Roof cap assembly with supporting cylinders for roof support mec

1987-08-07

1988-09-27

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405291, 405295, E21D 17054, E21D 17086

Patent

active

047737956

ABSTRACT:
A roof cap assembly of a roof support mechanism includes a main cap having extension bearing portions at its front end, a forward cap which is pivotally attached at its rear end to the extension bearing portions of the main cap, and two supporting cylinders connected between the main cap and the forward cap at spaced apart locations across their widths and so as not to extend therebelow. The supporting cylinders include a housing containing twin pistons and an adjustable pressure transmitter is provided for each supporting cylinder and is constructed to increase the pressure in the pressure chambers therein when the pressure of the pressure medium supplied thereto exceeds a minimum set value.

REFERENCES:
patent: 3097829 (1963-07-01), Seddon
patent: 3333425 (1967-08-01), Hemard
patent: 4293246 (1981-10-01), Boer et al.
patent: 4447174 (1984-05-01), Becker et al.
patent: 4465408 (1984-08-01), Krieger et al.

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