# US 10,864,579 B2 · Chuck > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,864,579 B2 - Document ID: US10864579B2 - Status: Granted - Kind: B2 - Application number: 16/633,561 - Filed: 2018-02-08 - Published: 2020-07-09 - Granted: 2020-12-15 - Earliest claimed: 2017-07-24 - Assignees: Kitagawa Iron Works Co., Ltd. - Applicants: Kitagawa Iron Works Co., Ltd. - Inventors: Tamio Nishimiya - Web page: https://patentgrep.com/patent/US10864579B2 ## CPC - B23B 31/16279: {Fixation on the master jaw} - B23B 31/16: moving radially - B23Q 3/00: Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine (work-tables or other parts, e.g. faceplates, normally not incorporating means for securing work B23Q1/00; automatic position control B23Q15/00 {; food cutting boards A47J47/00; workpiece support for dies B21D37/02}; rotary tool heads for turning-machines B23B3/24, B23B3/26; non-driven tool holders B23B29/00; general features of turrets B23B29/24 {; drawbars in spindles B23B31/261; for electrical discharge machining B23H11/003; for welding B23K37/04; means for securing grinding wheels B24B45/00; mountings for abrasive wheels B24D5/16}; tools or bench devices for fastening, connecting, disengaging or holding B25B {; chucks for percussive tools B25D17/084; work benches for manual work B25H1/00; devices for securing circular saw blades B27B5/32; for assembling or manufacturing aircrafts B64F5/10; devices for holding circuit boards H05K13/0061; for holding semiconductors or wafers H10P72/00}) - B23Q 3/18: for positioning only - Y10T 279/1986: Jaws - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Each jaw includes a master jaw with serrations and a top jaw, with serrations, to be fastened to a T-nut. The support groove includes a first keyway into which the key is fitted, whereas the top jaw includes a second keyway into which a tip of the key is fitted. A gap exists between the key and each of the first keyway and the second keyway. The key is inclined or twisted with respect to both the first keyway and the second keyway. ## Claims ### Claim 1 A chuck comprising: a plurality of jaws in front of a chuck body, the jaws sliding radially to support a workpiece so that a center of the workpiece agrees with a rotation axis, wherein each of the jaws includes: a master jaw assembled to the chuck body and having, in front of the chuck body, a contacted surface with serrations extending circumferentially; a connecting member being inserted into a support groove that is formed in the contacted surface to extend radially and being incapable of coming out along the rotation axis; and a top jaw having a contact surface with serrations, fastened to the connecting member along the rotation axis to come into close contact with the contacted surface, and being detachably attached to the master jaw to support the workpiece, the connecting member includes: a stopper extending along the support groove; and a key extending, with a width smaller than that of the stopper, in accordance with the stopper; the support groove includes: a first keyway into which the key is fitted with a tip of the key protruding from the contacted surface; and a stopper retainer configured to hold the stopper, the top jaw includes, on the contact surface, a second keyway into which the tip of the key is fitted, a gap exists between the key and each of the first keyway and the second keyway, and a close contact between the contact surface and the contacted surface inclines or twists the key with respect to both the first keyway and the second keyway. ### Claim 2 (depends on 1) The chuck of claim 1, wherein the close contact between the contact surface and the contacted surface inclines or twists the key with respect to both the first keyway and the second keyway to come into contact with the first keyway and the second keyway. ### Claim 3 (depends on 2) The chuck of claim 2, wherein the top jaw is made of a soft material more easily deformable than the connecting member, and the close contact between the contact surface and the contacted surface twists and allows the key to bite into the second keyway. ### Claim 4 (depends on 3) The chuck of claim 3, wherein the key includes: a first key to be fitted into the first keyway; and a second key to be into the second keyway, and the first key and the second key extend inclined with respect to each other. ### Claim 5 (depends on 3) The chuck of claim 3, wherein the key includes: a first key to be fitted into the first keyway; and a second key to be into the second keyway, and the first key has, on its sides extending longitudinally, a pair of first protrusions protruding from different longitudinal positions in opposite directions, the second key has, on its sides extending longitudinally, a pair of second protrusions protruding from different longitudinal positions in opposite directions, a width of the first key including one of the first protrusions is smaller than the first keyway, and a maximum width of the first key including both the first protrusions is larger than the first keyway, and a width of the second key including one of the second protrusions is smaller than the second keyway, and a maximum width of the second key including both the second protrusions is larger than the second keyway. ### Claim 6 (depends on 5) The chuck of claim 5, wherein each of the pair of the second protrusions protrudes transversely from one pair of diagonally opposing corners at both the longitudinal ends of the second key. ### Claim 7 (depends on 5) The chuck of claim 5, wherein one of the first protrusions protrudes transversely from one longitudinal end of the first key, the other of the first protrusions protrudes transversely from a longitudinally intermediate part of the first key, one of the second protrusions protrudes transversely from one longitudinal end of the second key, and the other of the second protrusions protrudes transversely from a longitudinally intermediate part of the second key. ### Claim 8 (depends on 2) The chuck of claim 2, wherein at least one of the first keyway and the second keyway extends inclined with respect to the associated serrations. ### Claim 9 (depends on 2) The chuck of claim 2, wherein the key includes: a first key to be fitted into the first keyway; and a second key to be into the second keyway, and the first key and the second key extend inclined with respect to each other. ### Claim 10 (depends on 2) The chuck of claim 2, wherein the key includes: a first key to be fitted into the first keyway; and a second key to be into the second keyway, and the first key has, on its sides extending longitudinally, a pair of first protrusions protruding from different longitudinal positions in opposite directions, the second key has, on its sides extending longitudinally, a pair of second protrusions protruding from different longitudinal positions in opposite directions, a width of the first key including one of the first protrusions is smaller than the first keyway, and a maximum width of the first key including both the first protrusions is larger than the first keyway, and a width of the second key including one of the second protrusions is smaller than the second keyway, and a maximum width of the second key including both the second protrusions is larger than the second keyway. ### Claim 11 (depends on 10) The chuck of claim 10, wherein each of the pair of the second protrusions protrudes transversely from one pair of diagonally opposing corners at both the longitudinal ends of the second key. ### Claim 12 (depends on 11) The chuck of claim 11, wherein one of the first protrusions protrudes transversely from one longitudinal end of the first key, the other of the first protrusions protrudes transversely from a longitudinally intermediate part of the first key, one of the second protrusions protrudes transversely from one longitudinal end of the second key, and the other of the second protrusions protrudes transversely from a longitudinally intermediate part of the second key. ### Claim 13 (depends on 10) The chuck of claim 10, wherein one of the first protrusions protrudes transversely from one longitudinal end of the first key, the other of the first protrusions protrudes transversely from a longitudinally intermediate part of the first key, one of the second protrusions protrudes transversely from one longitudinal end of the second key, and the other of the second protrusions protrudes transversely from a longitudinally intermediate part of the second key. ### Claim 14 (depends on 1) The chuck of claim 1, wherein at least one of the first keyway and the second keyway extends inclined with respect to the associated serrations. ### Claim 15 (depends on 1) The chuck of claim 1, wherein the key includes: a first key to be fitted into the first keyway; and a second key to be into the second keyway, and the first key and the second key extend inclined with respect to each other. ### Claim 16 (depends on 1) The chuck of claim 1, wherein the key includes: a first key to be fitted into the first keyway; and a second key to be into the second keyway, and the first key has, on its sides extending longitudinally, a pair of first protrusions protruding from different longitudinal positions in opposite directions, the second key has, on its sides extending longitudinally, a pair of second protrusions protruding from different longitudinal positions in opposite directions, a width of the first key including one of the first protrusions is smaller than the first keyway, and a maximum width of the first key including both the first protrusions is larger than the first keyway, and a width of the second key including one of the second protrusions is smaller than the second keyway, and a maximum width of the second key including both the second protrusions is larger than the second keyway. ### Claim 17 (depends on 16) The chuck of claim 16, wherein each of the pair of the second protrusions protrudes transversely from one pair of diagonally opposing corners at both the longitudinal ends of the second key. ### Claim 18 (depends on 17) The chuck of claim 17, wherein each of the pair of the first protrusions protrudes from one longitudinal end of the first key in a direction opposite to corresponding one of the second protrusions. ### Claim 19 (depends on 17) The chuck of claim 17, wherein one of the first protrusions protrudes transversely from one longitudinal end of the first key, the other of the first protrusions protrudes transversely from a longitudinally intermediate part of the first key, one of the second protrusions protrudes transversely from one longitudinal end of the second key, and the other of the second protrusions protrudes transversely from a longitudinally intermediate part of the second key. ### Claim 20 (depends on 16) The chuck of claim 16, wherein one of the first protrusions protrudes transversely from one longitudinal end of the first key, the other of the first protrusions protrudes transversely from a longitudinally intermediate part of the first key, one of the second protrusions protrudes transversely from one longitudinal end of the second key, and the other of the second protrusions protrudes transversely from a longitudinally intermediate part of the second key.