Impact Crusher Hardening Method

Author:  Harey Conrad Kern
Source:  US Patent 3,498,547
Doc ID:  1968043
Year of Publication:  1968
Abstract:  
A method for hardening the working surfaces of an impact type crusher while the crusher is in operation. Metal balls are introduced into an operating impact type crusher, impact against the working surfaces. If material is being crushed in the crusher, the metal balls aid in crushing the material.