# US 5,117,620 A · Detachable knife assembly for a flail machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,117,620 A - Document ID: US5117620A - Status: Granted - Kind: A - Application number: 07/653,763 - Filed: 1991-02-11 - Granted: 1992-06-02 - Earliest claimed: 1991-02-11 - Assignees: Mathews Company - Inventors: Ronald D. Gillund - Web page: https://patentgrep.com/patent/US5117620A ## CPC - A01D 34/52: Cutting apparatus - A01D 34/535: with cutting members pivotally attached to the rotating axle, e.g. flails - Y10S 56/17: Cutter details - A01D: HARVESTING; MOWING - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A detachable knife assembly having a hanger bracket forming a curved end. The curved end defines an opening large enough to fit the curved end of the hanger bracket over a mounted hanger rod. A retaining bracket is positioned adjacent the hanger bracket and close enough to the curved end of the hanger bracket to enclose and retain the hanger rod within the hanger bracket opening. A knife blade is either a part of or secured to the hanger bracket. The retaining bracket is detachably secured to the hanger bracket. The curved end of the hanger bracket preferably forms a curve about an arc segment of approximately 180.degree.. ## Claims ### Claim 1 A detachable knife assembly comprising: a hanger bracket forming a curved end and a knife end, said curved end defining a hanger bracket opening large enough to fit over a hanger rod; a retaining bracket, a mounting portion of said retaining bracket positioned adjacent said hanger bracket, a bearing portion of said retaining bracket angled with respect to said mounting portion away from said hanger bracket, an outer edge of said bearing portion spaced from an edge of said curved end, said retaining bracket positioned adjacent said hanger bracket and close enough to said curved end to enclose and retain the hanger rod within said hanger bracket opening; and attachment means for detachably securing said retaining bracket to said hanger bracket. ### Claim 2 (depends on 1) A detachable knife assembly according to claim 1 wherein said curved end forms a curve about an arc segment of approximately 180.degree.. ### Claim 3 (depends on 1) A detachable knife assembly according to claim 1 further comprising a knife blade secured to said hanger bracket. ### Claim 4 (depends on 3) A knife assembly according to claim 3 wherein said knife blade is detachably secured to said hanger bracket. ### Claim 5 (depends on 3) A knife assembly according to claim 3 wherein said attachment means further comprise: said hanger bracket, said knife blade and said retaining bracket each having a plurality of corresponding through holes, a plurality of bolts each mounted through one of said corresponding through holes, and a plurality of nuts matingly engageable with corresponding said bolts. ### Claim 6 (depends on 5) A knife assembly according to claim 5 wherein each said bolt is a carriage bolt. ### Claim 7 (depends on 5) A knife assembly according to claim 5 wherein at least one said through hole of said retaining bracket is enlarged for wrench access to the corresponding said bolt. ### Claim 8 (depends on 5) A knife assembly according to claim 5 wherein at least one of said through holes is shaped as a slot for adjusting a position of said retaining bracket with respect to said hanger bracket. ### Claim 9 In a knife assembly having a hanger bracket forming a curved end and a knife element, the improvement comprising: the curved end defining a hanger bracket opening large enough to fit over a hanger rod, a retaining bracket, a mounting portion of said retaining bracket positioned adjacent the hanger bracket, a bearing portion of the retaining bracket angled with respect to said mounting portion away from said hanger bracket, an outer edge of said bearing portion spaced from an edge of the curved end, said retaining bracket positioned adjacent said hanger bracket and close enough to the curved end to enclose and retain the hanger rod within said hanger bracket opening, and attachment means for detachably securing said retaining bracket to the hanger bracket. ### Claim 10 (depends on 9) In a knife assembly according to claim 9 wherein the curved end forms a curve about an arc segment of approximately 180.degree.. ### Claim 11 (depends on 9) In a knife assembly according to claim 9 wherein said knife element further comprises a knife blade secured to said hanger bracket. ### Claim 12 (depends on 11) In a knife assembly according to claim 11 wherein said knife blade is detachably secured to said hanger bracket. ### Claim 13 (depends on 11) In a knife assembly according to claim 11 wherein said attachment means further comprise: the hanger bracket, said knife blade and said retaining bracket each having a plurality of corresponding through holes, a plurality of bolts each mounted through one of said corresponding through holes, and a plurality of nuts matingly engageable with corresponding said bolts. ### Claim 14 (depends on 13) In a knife assembly according to claim 13 wherein each said bolt is a carriage bolt. ### Claim 15 (depends on 13) In a knife assembly according to claim 13 wherein at least one said through hole of said retaining bracket is enlarged for wrench access to the corresponding said bolt. ### Claim 16 (depends on 13) In a knife assembly according to claim 13 wherein at least one of said through holes is shaped as a slot for adjusting a position of said retaining bracket with respect to said hanger bracket. ### Claim 17 A rotor assembly for a shredder, the rotor assembly comprising: a rotor, a plurality of hanger rods, mounting means for mounting each said hanger rod on said rotor, a plurality of knife assemblies; and each said knife assembly comprising a hanger bracket forming a curved end and a knife end, said curved end defining a hanger bracket opening large enough to fit over one of said hanger rods, a retaining bracket, a mounting portion of said retaining bracket positioned adjacent said hanger bracket, a bearing portion of said retaining bracket angled with respect to said mounting portion away from said hanger bracket, an outer edge of said bearing portion spaced from an edge of said curved end, said retaining bracket positioned adjacent said hanger bracket and close enough to said curved end to enclose and retain said one of said hanger rods within said hanger bracket opening; attachment means for detachably securing said retaining bracket to said hanger bracket. ### Claim 18 (depends on 17) A rotor assembly according to claim 17 wherein said mounting means further comprise a plurality of retainer brackets secured to said rotor, each said retainer bracket forming an opening through which a corresponding said hanger rod is mounted. ### Claim 19 (depends on 17) A rotor assembly according to claim 17 wherein each said knife assembly further comprises a knife blade secured to said hanger bracket. ### Claim 20 (depends on 17) A rotor assembly according to claim 17 wherein said knife blade is detachably secured to said hanger bracket. ### Claim 21 (depends on 19) A rotor assembly according to claim 19 wherein said attachment means comprise: each said hanger bracket, each said knife blade and each said retaining bracket each having a plurality of corresponding through holes, a plurality of bolts each mounted through one of said corresponding through holes, and a plurality of nuts matingly engageable with corresponding said bolts. ### Claim 22 (depends on 21) A rotor assembly according to claim 21 wherein at least one said through hole of each said retaining bracket is enlarged for wrench access to the corresponding said bolt. ### Claim 23 (depends on 21) A rotor assembly according to claim 21 wherein at least one of said through holes is shaped as a slot for adjusting a position of each said retaining bracket with respect to said hanger bracket.