Rockett, Frank H. Engineering Consultant, Charlottesville, Virginia.
A power device for removing bulk materials from railway freight cars or highway trucks. Especially in the case of railway cars, the car structure may aid the unloading, as in the hopper-bottom dumper; here the unloader may be a vibrator which improves flow of the bulk material into a storage bin or to a conveyor. Thus an unloader is the transitional device between interplant transportation means and intraplant materials-handling facilities. See also: Transportation engineering
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