1974-04-09
1976-03-16
Wolfe, Robert L.
E21D 1902
Patent
active
039437230
ABSTRACT:
Advanceable roof-supports on a longwall face are provided with a shield assembly for preventing flow of broken rock material from the goaf, the shield assembly being made up of a series of shield units each comprising two lengths of round link chain suspended from a roof-support canopy and a plurality of overlapping cross members connected to the chain links by pivotal mounting means.
REFERENCES:
patent: 2943696 (1960-07-01), Roberts
Evans Frank
Gillard Dennis Alfred
Coal Industry (Patents) Limited
Corbin David H.
Wolfe Robert L.
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