Jeffrey L Washburn

US Patent:

6663030, Dec 16, 2003

Filed:

Mar 21, 2002

Appl. No.:

10/105019

Inventors:

Jeffrey H. Washburn - Shoreview MN 55432
Gary G. Edwards - Blaine MN 55434

International Classification:

B07C 700

US Classification:

241 70, 241299

Abstract:

A grate segment fastening system for an ore grinding machine, comprising a grate, including a top surface and a bottom surface opposite the top surface, wherein the top surface and the bottom surface are separated by a grate thickness, the grate being defined in use by an axis end, and a circumferential end opposite the axis side; wherein the grate is further defined by a second lateral surface, and a first lateral surface opposite the second lateral surface, the first lateral surface further comprising a raised mounting portion wherein at least one mounting bore extends into and through the body of the raised mounting portion, a plurality of throughput apertures extending through the grate from the top surface to the bottom surface and, a grate holder, including a top surface and a pulp lifter contact surface, opposite the top surface, the grate holder being defined by an axial end, and a circumferential end opposite the axial end, an anchor bore of predetermined transverse size extending from the top surface to the pulp lifter contact surface, a mounting bore of predetermined transverse size extending at least partially into the mounting surface, and; a threaded member insertable through a mounting bore of the grate into an aligned mounting bore on the grate holder.

US Patent:

20010045476, Nov 29, 2001

Filed:

Feb 7, 2001

Appl. No.:

09/778570

Inventors:

Jeffrey Washburn - Shoreview MN, US
David Wahlgren - Fridley MN, US

Assignee:

ME INTERNATIONAL

International Classification:

B02C002/00

US Classification:

241/207000

Abstract:

In one embodiment, concaves for gyratory crushers are formed in a trapezoidal or triangular shape to achieve essentially three-point contact with an external shell of the gyratory crusher. In a further embodiment, concaves for gyratory crushers are provided with adjustable pads whose position with respect to the back surface of the concave can be changed. In a further embodiment, concaves for gyratory crushers are provided with alignment pads that are inserted between the back surface of the concave and the external shell of the gyratory crusher. In a further embodiment, concaves for gyratory crushers are provided with removable fastening member such as bolts that engage the back surface of the concave to mount the concave to the external shell of the gyratory crusher. The concaves of the present invention can provide secure mounting of the concaves in place to promote longer wear life and are easily removed for replacement.