Patent ID: 7338000
Filing Date: 2008-03-04
Classification: B02C

Abstract:
1. An inner shell for use in a gyratory crusher, which inner shell is intended to be brought into contact with a material that is supplied at the upper portion of the crusher and is to be crushed, and that in a crushing gap crush the same material against an outer shell, wherein the inner shell during crushing will rotate around its own center axis in a first direction, wherein the inner shell has at least one additional crusher surface, which, in horizontal projection and as seen in the first direction, has a decreasing distance to said center axis and which at a first end, which is situated at the downstream end of the additional crusher surface in respect of the first direction, is situated at a first distance from the center axis, and at a second end, which is situated at the upstream end of the additional crusher surface in respect of the first direction, is situated at a second distance from the center axis, which second distance is greater than said first distance, so that objects can be introduced between the additional crusher surface and the outer shell near said first end in order to, near said second end, be squeezed between the additional crusher surface and the outer shell and be crushed.