# US 9,518,464 B2 · Combination polycrystalline diamond bit and bit holder > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,464 B2 - Document ID: US9518464B2 - Status: Granted - Kind: B2 - Application number: 14/714,547 - Filed: 2015-05-18 - Published: 2015-10-15 - Granted: 2016-12-13 - Earliest claimed: 2012-10-19 - Assignees: The Sollami Company - Applicants: Phillip Sollami - Inventors: Phillip Sollami - Web page: https://patentgrep.com/patent/US9518464B2 ## CPC - E21C 35/183: with inserts or layers of wear-resisting material {(drill bits with wear-resistant parts E21B10/46)} - B28D 1/188: {with exchangeable cutter bits or cutter segments} - E21C 35/18: Mining picks; Holders therefor (planing knives E21C27/44) - E21C 35/19: Means for fixing picks or holders - E21C 35/197: using sleeves, rings or the like, as main fixing elements - E21C 35/1831: {Fixing methods or devices} - E21C: MINING OR QUARRYING - B28D: WORKING STONE OR STONE-LIKE MATERIALS ## Abstract A quick change type bit/bit holder includes several different structures for holding the item in a bit block without the necessity of a fastener. The bit portion of the bit/bit holder combination includes a ductile steel insert with a polycrystalline diamond coated tungsten carbide bit positioned therein. The ductility of the steel insert acts as a shock absorber to allow the bit to successfully remove concrete as well as asphalt in a road milling machine. ## Claims ### Claim 1 A bit holder for road milling machinery comprising: a shank comprising: an elongate generally cylindrical member having a distal end including an annular axially inwardly extending groove therein defining an interior surface of an annular outer sidewall, the outer sidewall having a thickness between about ⅛ and ½ inch. ### Claim 2 (depends on 1) The bit holder for road milling machinery as defined in claim 1 further including: at least one axially oriented elongate slot extending longitudinally on the annular outer sidewall from the distal end of said shank. ### Claim 3 (depends on 1) The bit holder for road milling machinery as defined in claim 1 further comprising: an enlarged diameter body extending forwardly of said shank, said body including at its forwardmost end a generally cylindrical flat topped bit with a polycrystalline diamond (PCD) surface. ### Claim 4 (depends on 3) The bit holder for road milling machinery as defined in claim 3 wherein: said generally cylindrical flat topped bit is mounted in one of a steel base and a metal carbide base, the base having a ductility that provides an impact absorbing member for the flat topped bit, wherein the flat topped bit comprises a PCD tipped bit. ### Claim 5 (depends on 1) The bit holder for road milling machinery as defined in claim 1 further comprising: an enlarged diameter body extending forwardly of said shank, said body including at its forwardmost end a generally cylindrical conical topped bit with a polycrystalline diamond (PCD) surface. ### Claim 6 (depends on 5) The bit holder for road milling machinery as defined in claim 5 wherein: said generally cylindrical conical topped bit is mounted in one of a steel base and a metal carbide base, the base having a ductility that provides an impact absorbing member for the conical topped bit, wherein the conical topped bit comprises a PCD tipped bit. ### Claim 7 (depends on 1) The bit holder for road milling machinery as defined in claim 1, wherein the groove axially extends a predetermined distance from the distal end toward a forward end of the generally cylindrical member, and wherein the predetermined distance is less than a distance from the distal end to the forward end of the shank. ### Claim 8 (depends on 1) The bit holder for road milling machinery as defined in claim 1, further comprising: a plurality of axially oriented elongate slots extending longitudinally on said annular outer sidewall from the distal end, wherein each slot is evenly spaced along the outer sidewall. ### Claim 9 (depends on 1) The bit holder for road milling machinery as defined in claim 1, wherein the generally cylindrical member includes a solid core axially extending from a forward end of the generally cylindrical member, a distal section of the solid core separated from the interior surface of the outer sidewall by the groove. ### Claim 10 (depends on 1) The bit holder for road milling machinery as defined in claim 1, further comprising: an enlarged diameter body extending forwardly of the shank, the body including a forwardly extending annular collar having an annular trough, the trough adapted to receive an annular ring. ### Claim 11 (depends on 1) The bit holder for road milling machinery as defined in claim 1, further comprising: a tapered portion adjacent the distal end of the generally cylindrical member; an annular cylindrical portion adjacent an upper end of the tapered portion; and an annular cylindrical outer wall portion adjacent an upper end of the annular cylindrical portion. ### Claim 12 A bit holder for road milling machinery comprising: a shank comprising: an elongate generally cylindrical member having a distal end including an annular axially inwardly extending groove therein defining an interior surface of an annular outer sidewall, the outer sidewall having a thickness between about 1/16 and ¼ inch. ### Claim 13 (depends on 12) The bit holder for road milling machinery as defined in claim 12, wherein the groove axially extends a predetermined distance from the distal end toward a forward end of the generally cylindrical member, and wherein the distance is less than the distance from the distal end to the forward end. ### Claim 14 (depends on 12) The bit holder for road milling machinery as defined in claim 12, wherein the generally cylindrical member includes a solid core axially extending from a forward end of the generally cylindrical member, a distal section of the solid core separated from the interior surface of the outer sidewall by the groove. ### Claim 15 (depends on 12) The bit holder for road milling machinery as defined in claim 12, further comprising: an enlarged diameter body extending forwardly of the shank, the body including a forwardly extending annular collar having an annular trough, the trough adapted to receive an annular ring. ### Claim 16 (depends on 12) The bit holder for road milling machinery as defined in claim 12, further comprising: a tapered portion adjacent the distal end of the generally cylindrical member; an annular cylindrical portion adjacent an upper end of the tapered portion; and an annular cylindrical outer wall portion adjacent an upper end of the annular cylindrical portion.