Cmi Limited

Gary L Westphall

George W Swisher, Jr

Don W Smith

An improved material transfer mechanism comprising a selectively variable speed hydraulic power assembly having an output connected to and powering a material conveyor. A double acting hydraulic ram positions a swash plate control lever that determines the rotational speed of the output shaft, and a hydraulic porting valve assembly is disposed to actuate the hydraulic ram, the hydraulic porting valve assembly comprising a pivotally supported valve body having an internally disposed fluid control means, the fluid control means being variably displaced in the valve body by the actuation of a pressure controlling mechanism for the purpose of selectively determining and establishing fluid communication of a source of hydraulic pressure fluid to alternate ends of the hydraulic ram with the hydraulic porting valve assembly to selectively control the hydraulic ram. The valve body is biased in a first pivotal direction and is movable in a second pivotal direction by a feed back linkage cable interconnecting the valve body and the swash plate control lever. A sensor mechanism detects the material transferred by the material conveyor and responsively positions the pressure controlling mechanism independently to the position of the valve body.

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Oklahoma City, OK, United States of America

Gary L Westphall