Two part mine roof support unit

Details Two part mine roof support unit Two part mine roof support unit

1981-06-29

1983-08-30

Byers, Jr., Nile C.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

299 33, E21D 2300

Patent

active

044013990

ABSTRACT:
A mine roof support unit is constituted by two detachably connected parts. Each of the parts has a floor girder which supports a roof bar by means of a hydraulic prop. The roof support unit is intended for use at the lower end of an inclined longwall working which meets its access gallery at an angle other than 90.degree.. The detachability of the two parts enables one of these parts to be removed from the working as its face is advanced. The removed part can then be transported to the other end of the working. Each of the parts is provided with means for detachably connecting an advance mechanism.

REFERENCES:
patent: 3197965 (1965-08-01), Lee
patent: 3434292 (1969-03-01), Heyer
patent: 3438209 (1969-04-01), Grebe
patent: 3482878 (1969-12-01), Floter
patent: 3524321 (1970-08-01), Wilkenloh
patent: 3812681 (1974-05-01), Allen
patent: 3991580 (1976-11-01), Allen
patent: 4008578 (1977-02-01), Blumenthal
patent: 4027489 (1977-06-01), Walker
patent: 4325659 (1982-04-01), Plevak

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