Mining roof support cylinder corrosion protection apparatus...

Details Mining roof support cylinder corrosion protection apparatus... Mining roof support cylinder corrosion protection apparatus...

2008-05-27

2008-05-27

Singh, Sunil (Department: 3672)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C422S010000

Reexamination Certificate

active

11723096

ABSTRACT:
A roof support for an underground mine which has a hydraulic cylinder positioned between a roof engaging support and a ground engaging base and has a flexible gas barrier or enclosure surrounding surfaces of said hydraulic cylinder which are subject to corrosion by gases present in the underground mine. Continuous flowing non-corrosive gas such as nitrogen is supplied to a space between the gas barrier and the hydraulic cylinder for preventing corrosion of cylinder surfaces by corrosive gases present in the mine which may include hydrogen sulfide.

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patent: 5026218 (1991-06-01), Zimmerman
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patent: 5950673 (1999-09-01), Elliott-Moore
patent: 5997100 (1999-12-01), Marshall et al.
patent: 6551552 (2003-04-01), Lyublinski et al.
patent: 3139046 (1983-04-01), None
patent: 62-287087 (1987-12-01), None

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