Apparatus for processing coal and like material

Claim 1

Apparatus for processing coal and like material, comprising pressurized receiver means for the material, a material supply conduit connected to said receiver means for supplying material thereto, a plurality of material feeding devices connected to said material supply conduit to permit their selective employment for feeding material to said supply conduit, each of said feeding devices comprising barrel means adapted to communicate with material source means to receive material in solid form therefrom and having a discharge opening for discharging material from such barrel means to said supply conduit, each of said feeding devices further comprising screw means rotatably in its said barrel means for feeding material in such barrel means towards its said discharge opening and heater means operatively associated with at least one of its said barrel means and screw means for causing material in its said barrel means to be converted from solid form to plastic-like condition by heating, and individual shut-off valves for said feeding devices permitting selective employment of said feeding devices for feeding of material to said supply conduit, the said shut-off valve for each said feeding device being associated therewith intermediate the said barrel means of the feeding device and said supply conduit for alternatively permitting and preventing discharge of material through the said discharge opening of the feeding device to said supply conduit.