# US 4,397,426 A · Shoe bracket assembly for vertical shaft impact crushing machines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,397,426 A - Document ID: US4397426A - Status: Granted - Kind: A - Application number: 06/261,379 - Filed: 1981-05-07 - Granted: 1983-08-09 - Earliest claimed: 1981-05-07 - Assignees: Spokane Crusher Mfg. Co. - Inventors: Donald R. Warren; Kenneth D. Warren - Web page: https://patentgrep.com/patent/US4397426A ## CPC - B02C 13/1814: {by means of beater or impeller elements fixed on top of a disc type rotor} - B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02}) ## Abstract A shoe bracket assembly is described for mounting an impeller shoe to the horizontal rotatable turntable of a vertical shaft centrifugal crushing machine. The shoe bracket includes removable wear protector plates on opposed end faces thereof. The plates protect the rigid base member of the bracket assembly against wear. The wear plates are slidably mounted to the base member by slidable dovetail connector members and are locked into place between abutment surfaces on the base member and a back face surface of the impeller shoe. The plates can be easily removed and replaced following removal of the impeller shoe. ## Claims ### Claim 1 In a vertical shaft impact crushing machine having: a rotatable horizontal impeller turntable; a removable elongated impeller shoe mounted on the turntable, said shoe having an elongated back mounting face extending along the length of the shoe between an inner end and an outer end; an upright bracket member mountable to the turntable and having a front face and opposed side faces; wherein the front face of the bracket member has a width that is less than the length of the impeller shoe to receive and mount the back surface of the impeller shoe, with the ends of the shoe extending beyond the side faces of the bracket member; wherein the improvement comprises: wear protector plates, each having a bearing face a wear face, and a forward end face; and means for releasably mounting the wear protector plates to the side faces of the bracket member with the inner and outer end of the impeller shoe overlapping the forward end faces of the wear protection plates to secure the wear protector plates in place when the crushing shoes are mounted to the shoe bracket. ### Claim 2 (depends on 1) In the vertical shaft impact crushing machine as claimed by claim 1 wherein said releasable mounting means is comprised of complementary dovetail connector members on the bracket member and wear protector plates, said connector members being slidably interfitted to releasably mount the wear protector plates to the base member. ### Claim 3 (depends on 2) In the vertical shaft impact crushing machine as claimed by claim 2 wherein the dovetail connector members interfit horizontally. ### Claim 4 (depends on 2) In the vertical shaft impact crushing machine as claimed by claim 2 wherein the dovetail connector members include open dovetail grooves formed in the opposed side faces of the bracket member and complementary dovetail projections formed on the inside faces of the wear protector plates. ### Claim 5 (depends on 4) In the vertical shaft impact crushing machine as claimed by claim 4 wherein the dovetail connector members slide horizontally together with the protector plates sliding rearwardly with respect to the bracket member. ### Claim 6 (depends on 2) In the vertical shaft impact crushing machine as claimed by claim 2 wherein the dovetail connector members converge rearwardly. ### Claim 7 (depends on 2) In the vertical shaft impact crushing machine as claimed by claim 2 wherein the dovetail connector members are integral with the base member and wear protector plates and wherein said members slide together horizontally; and further comprising complementary abutment surfaces on the bracket member and wear protector plates for preventing rearward sliding motion of the protector plates relative to the base member beyond positions wherein the forward end faces are substantially aligned with the front face of the bracket member. ### Claim 8 (depends on 7) In the vertical shaft impact crushing machine as claimed by claim 7 wherein the dovetail connector members converge rearwardly. ### Claim 9 (depends on 8) In the vertical shaft impact crushing machine as claimed by claim 8 wherein the dovetail connector members include open dovetail grooves formed in the opposed end faces of the bracket member and complementary dovetail projections formed on the bearing faces of the wear protector plates.