# US 2014/0360334 A1 · Hard-material threaded connection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360334 A1 - Document ID: US20140360334A1 - Status: Published application - Kind: A1 - Application number: 14/373,390 - Filed: 2013-01-18 - Published: 2014-12-11 - Earliest claimed: 2012-01-20 - Assignees: Ceratizit Austria Gesellschaft m.b.H. - Applicants: Ceratizit Austria Gesellschaft Mbh - Inventors: Alexander Singer-Schnoeller - Web page: https://patentgrep.com/patent/US20140360334A1 ## CPC - B23B 51/00: Tools for drilling machines - B23B 31/11: Retention by threaded connection - B23B 51/02: Twist drills - F16B 7/18: using screw-thread elements {(F16B7/025 takes precedence; for turnbuckles F16B7/06)} - B23B 2231/0204: Connection of shanks to working elements of tools - B23B 2231/0244: Special forms not otherwise provided for - B23B 2251/02: Connections between shanks and removable cutting heads - Y10T 29/49826: Assembling or joining - Y10T 83/9457: Joint or connection - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A hard-material threaded connection includes a structural part, which has a hard material and a first threaded portion formed in the hard material, and a component having higher elasticity that has a second threaded portion cooperating with the first threaded portion. The first threaded portion and the second threaded portion have a different thread pitch. ## Claims ### Claim at position 1 1-15. (canceled) ### Claim 16 A hard-material threaded connection, comprising: a structural part having a hard material and a first threaded portion formed in said hard material; and a component having higher elasticity than said hard material and having a second threaded portion cooperating with said first threaded portion, said first threaded portion and said second threaded portion having different thread pitches. ### Claim 17 (depends on 16) The hard-material threaded connection according to claim 16, wherein a difference in said thread pitches amounts to more than 1.5%. ### Claim 18 (depends on 16) The hard-material threaded connection according to claim 16, wherein a difference in said thread pitches amounts to between 2.1% and 8%. ### Claim 19 (depends on 16) The hard-material threaded connection according to claim 16, wherein said first threaded portion is an internal thread. ### Claim 20 (depends on 16) The hard-material threaded connection according to claim 16, wherein said first and second threaded portions define an internal threaded portion and an external threaded portion, said internal threaded portion has a higher pitch than said external threaded portion. ### Claim 21 (depends on 16) The hard-material threaded connection according to claim 16, wherein said second threaded portion is a standard thread and said first threaded portion has a thread pitch deviating from said standard thread. ### Claim 22 (depends on 16) The hard-material threaded connection according to claim 16, wherein one of said first and second threaded portions is configured as an internal thread and is provided with a countersink such that said internal thread is applied so as to be recessed with respect to a surface. ### Claim 23 (depends on 16) The hard-material threaded connection according to claim 16, wherein said structural part which has said hard material is an exchangeable cutter. ### Claim 24 (depends on 16) The hard-material threaded connection according to claim 16, wherein said hard material is a hard metal or a cermet. ### Claim 25 (depends on 16) The hard-material threaded connection according to claim 16, wherein a difference in said thread pitches amounts to more than 2%. ### Claim 26 (depends on 16) The hard-material threaded connection according to claim 16, wherein said structural part which has said hard material is an exchangeable cutting head. ### Claim 27 A method for forming a threaded connection between a hard material and a component a having higher elasticity than the hard material, which comprises the steps of: screwing a structural part having the hard material and a first threaded portion formed in the hard material, to the component having the higher elasticity, the component having a second threaded portion cooperating with the first threaded portion, thereby forming the threaded connection, the first threaded portion and the second threaded portion have different thread pitches. ### Claim 28 (depends on 27) The method according to claim 27, wherein the first threaded portion is an internal thread and the second threaded portion is an external thread. ### Claim 29 The method according to 27, which further comprises forming the second threaded portion as a standard thread and the first threaded portion with a thread pitch deviating from the standard thread. ### Claim 30 A structural part, comprising: a hard material having a first threaded portion formed therein, the first thread portion configured for connecting to a second threaded portion formed on a component having a higher elasticity than said hard material, said first threaded portion having a thread pitch deviating from the second threaded portion. ### Claim 31 (depends on 30) The structural part according to claim 30, wherein the structural part is an exchangeable cutter or a cutting head, for fastening to a tool body. ### Claim 32 A method of forming a tool having a hard-material threaded connection, which comprises the steps of: providing a tool body; providing an exchangeable cutter; forming a hard-material threaded connection for connecting the tool body to the exchangeable cutter by performing the further steps of: forming at least a structural part of the exchangeable cutter from a hard material and having a first threaded portion formed in the hard material; forming a component of the tool body with a higher elasticity than the hard material and having a second threaded portion cooperating with the first threaded portion formed in the hard material, the first threaded portion and the second threaded portion having different thread pitches; and connecting the exchangeable cutter to the tool body by threading the first and second threaded portions to each other. ### Claim 33 (depends on 32) The method according to claim 32, which further comprises forming the exchangeable cutter as an exchangeable cutting head.