Apparatus for Treating Metal

Author:  David C. Turnbull
Source:  US Patent 2,131,767
Doc ID:  1936004
Year of Publication:  1936
Abstract:  
This invention relates to apparatus for treating metal and more particularly to apparatus for cleaning, polishing, hardening or otherwise treating the surfaces of casting, forgings and similar metallic articles. In cleaning, polishing, hardening or otherwise treating the surfaces of metallic articles it is desirable to so manipulate the articles in the stream of treating particles that the articles will be uniformly and satisfactorily cleaned or treated. Where the articles are small, rugged and so shaped that they can tumbled about, they can generally be effectively treated in a tumbling mill. However, where the articles are large, irregularly shaped, brittle or fragile they cannot be so cleaned and treated and other methods and apparatus must be employed.