David Manufacturing Company

John F Johannsen

Keith A Braun

A grain cleaning apparatus (10) for removing coarse and fine foreign materials from dirty grain before storage. The grain cleaning apparatus includes counter-rotating screen drums (18,20). Dirty grain is received in a frusto-conically shaped inner drum (18). Coarse foreign materials are prevented from passing through screen (100) of inner drum (18) and rather move to chute (38) where they fall to trough (40) for exiting from apparatus (10). Chute (38) is located between the output end (36) of the inner drum (18) and the output end (48) of the cylindrical outer drum (20). Grain is prevented from passing through screen (115) of outer drum (20). Fine foreign materials do pass therethrough, however, for exiting from apparatus (10). Clean grain drops from the output end (48) of outer drum (20). A motor (22) drives a secondary drive shaft (24). Shaft (24) drives first and second pulley systems (26,28) to rotate inner and outer screen drums (18,20) in opposite directions simultaneously.

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Rockford, IA, United States of America

John F Johannsen