Patent ID: 7891595
Filing Date: 2011-02-22
Classification: B02C

Abstract:
1. A cone crusher comprising: a frame; a bowl coupled to the frame for receiving a supply of material to be crushed; a bowl liner formed on the bowl to define one-half of a crushing gap; a crusher head assembly spaced from the bowl liner to define a second half of the crushing gap; an eccentric positioned to rotate about a fixed mounting shaft; a lower head bushing included in the crusher head assembly and surrounding the eccentric such that during rotation of the eccentric about the center shaft, the eccentric contacts the lower head bushing to move the crusher head toward and away from the bowl liner to create a crushing force within the crushing gap; and a contact pad recessed from an outer surface of the eccentric, wherein when the cone crusher operates without any material, the lower head bushing engages the contact pad formed on the eccentric.