# US 2019/0022764 A1 · Cutting tool and cutting tool body with a holding member for holding a coupling screw > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0022764 A1 - Document ID: US20190022764A1 - Status: Published application - Kind: A1 - Application number: 15/652,475 - Filed: 2017-07-18 - Published: 2019-01-24 - Earliest claimed: 2017-07-18 - Assignees: Iscar, Ltd. - Applicants: Iscar Ltd. - Inventors: Gil HECHT; Rajat SHARMA - Web page: https://patentgrep.com/patent/US20190022764A1 ## CPC - B23B 27/1614: {with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert (B23B27/1644 takes precedence)} - B23B 27/1622: {characterised by having a special shape} - B23B 29/043: {with cutting-off, grooving or profile cutting tools, i.e. blade- or disc-like main cutting parts (B23B29/14 takes precedence)} - F16B 35/005: {Set screws; Locking means therefor} - F16B 41/002: {Measures against loss of bolts, nuts or pins (devices for fastening nuts to surfaces F16B37/04)} - B23B 2205/04: Fixation screws, bolts or pins of particular form - B23B 2205/10: using two or more fixation screws - B23B 2205/12: Seats for cutting inserts - B23B 2260/124: Screws - B23B 2260/138: Screw threads - 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) ## Abstract A cutting tool body is configured for securing a cutting insert with a female thread. The cutting tool body includes a machining end and a tool peripheral surface which extends therefrom. The cutting tool body further includes a through, non-threaded tool coupling bore which opens out to the tool peripheral surface and a coupling screw which has a coupling screw thread. The coupling screw is being located in the tool coupling bore and configured to secure the cutting insert. The cutting tool body further includes a holding member which engages the coupling screw thread at least when the holding member is not in contact with the cutting insert. ## Claims ### Claim 1 A cutting tool body (12) configured for securing a cutting insert (14) having a female thread (78) and comprising: a machining end (18) and a tool peripheral surface (26) extending therefrom; a through, non-threaded tool coupling bore (42) opening out to the tool peripheral surface (26); and a coupling screw (52) having a coupling screw thread (60) and being located in the tool coupling bore (42) and configured to secure the cutting insert (14); wherein, the cutting tool body (12) further includes a holding member (80) which engages the coupling screw thread (60) at least when the holding member (80) is not in contact with the cutting insert (14). ### Claim 2 (depends on 1) The cutting tool body (12) according to claim 1, wherein the holding member (80) is configured to prevent the coupling screw (52) from falling out of the tool coupling bore (42), and prevent it from moving away from a driving tool (44) during turning. ### Claim 3 (depends on 1) The cutting tool body (12) according to claim 1, wherein the tool peripheral surface (26) comprises a pocket (16) in which the cutting insert (14) is seated, the pocket (16) comprises an outwardly facing pocket base surface (36) and first and second support walls (38, 40) which extend from the pocket base surface (36). ### Claim 4 (depends on 1) The cutting tool body (12) according to claim 1, wherein the holding member (80) applies a reaction force (RF) on the coupling screw (52) in a direction of a coupling screw rotation axis (R) which is equal or lower than a maximum holding force (MHF) which can cause plastic deformation in either the coupling screw (52) or the holding member (80). ### Claim 5 (depends on 4) The cutting tool body (12) according to claim 4, wherein when RF=MHF, the holding member (80) is configured to move, or jump, between thread recesses (62) of the coupling screw thread (60) to allow axial motion without rotation of the coupling screw (52). ### Claim 6 (depends on 1) The cutting tool body (12) according to claim 1, wherein the coupling screw (52) comprises first and second driving members (68, 70) which enable turning the coupling screw (52) via a driving tool (44) from two opposite sides of the cutting tool (10). ### Claim 7 (depends on 1) The cutting tool body (12) according to claim 1, wherein the holding member (80) protrudes into the tool coupling bore (42). ### Claim 8 (depends on 1) The cutting tool body (12) according to claim 1, wherein the holding member (80) is not elastic, and resiliently secured to the cutting tool via an elastic member (94). ### Claim 9 (depends on 1) The cutting tool body (12) according to claim 1, wherein the holding member (80) is elastic. ### Claim 10 (depends on 1) The cutting tool body (12) according to claim 1, wherein the holding member (80, 380, 580) is U-shaped or straight. ### Claim 11 (depends on 1) The cutting tool body (12) according to claim 1, wherein at least portions of the holding member (80, 280, 380, 480, 580) have a triangular, or circular, cross-section. ### Claim 12 (depends on 1) The cutting tool body (12) according to claim 1, wherein the holding member (80, 280, 380, 580) is replaceable and releasably located within a through holding bore (88, 288, 388, 588) which intersects the tool coupling bore (42, 242, 342, 542). ### Claim 13 (depends on 1) The cutting tool body (12) according to claim 1, wherein the holding member (580) is replaceable and releasably located within a holding recess (90) in the tool coupling bore (542). ### Claim 14 (depends on 1) The cutting tool body (12) according to claim 1, wherein the cutting tool body (12) comprises a locking screw (74) which is threaded into a blind locking bore (100) opening out only to the tool peripheral surface (26). ### Claim 15 (depends on 1) The cutting tool body (12) according to claim 1, wherein the coupling screw (52) does not protrude outwardly from the tool peripheral surface (26). ### Claim 16 (depends on 1) The cutting tool body (12) according to claim 1, wherein the cutting tool body (12) includes two coupling screws (52) and two tool coupling bores (42). ### Claim 17 (depends on 1) The cutting tool body (212) according to claim 1, wherein the cutting tool body (212) includes two coupling screws (252) and a single holding member (280) which engages both coupling screws (252) at least in a non-secured position. ### Claim 18 (depends on 1) A cutting tool (10) comprising the cutting tool body (12) according to claim 1 and a cutting insert (14) secured in a pocket (16) of the cutting tool body (12) via the coupling screw (52). ### Claim 19 (depends on 18) The cutting tool (10) according to claim 18, wherein the tool peripheral surface (26) comprises the pocket (16) in which the cutting insert (14) is seated, the pocket (16) comprises an outwardly facing pocket base surface (36) and support walls (38, 40) which extend therefrom; the cutting insert (14) comprises opposite insert base surfaces (102) and an insert peripheral surface (104) which extends therebetween. ### Claim 20 (depends on 18) The cutting tool (10) according to claim 18, wherein in a secured position, one of the insert base surfaces 102 abuts the pocket base surface (36), the insert peripheral surface (104) abuts the first and second support walls (38, 40) and the coupling screw (52) is screw threaded into the female thread (78) and tightened against a coupling bore chamfer (50). ### Claim 21 A cutting tool body (12) configured for securing a cutting insert (14) having a female thread (78) and comprising: a machining end (18) and a tool peripheral surface (26) extending therefrom; a through, non-threaded tool coupling bore (42) opening out to the tool peripheral surface (26); the tool coupling bore (42) of the cutting tool body (12) being configured to receive a coupling screw (52) having a coupling screw thread (60) that is receivable in the female thread (78) of the cutting insert (14); and the cutting tool body (12) further comprising a holding member (80) configured for engagement with the coupling screw thread (60). ### Claim 22 A cutting tool body (12) configured for securing a cutting insert (14) having a female thread (78) and comprising: a machining end (18) and a tool peripheral surface (26) extending therefrom; a through, non-threaded tool coupling bore (42) opening out to the tool peripheral surface (26); the tool coupling bore (42) of the cutting tool (12) being configured to receive a coupling screw (52) having a coupling screw thread (60) that is receivable in the female thread (78) of the cutting insert (14); and the cutting tool body (12) further comprising holding means (80) for holding engagement with the coupling screw thread (60) while in the tool cutting body (60). ### Claim 23 (depends on 1) The cutting tool body (12) according to claim 1, wherein the tool coupling bore (42) has a coupling bore chamfer (50) that extends radially inward within an intermediate region of the tool coupling bore (42) to define a contact location for a coupling screw head (58) of the coupling screw (52). ### Claim 24 (depends on 1) The cutting tool body (12) according to claim 1, wherein the tool coupling bore (42) is dimensioned such that the coupling screw (52) is retained, in its entirety, within the tool coupling bore (42) in a non-secured position. ### Claim 25 (depends on 1) A method of indexing or replacing a cutting insert (14) received in the pocket (16) of the cutting tool body (12) according to claim 1; the method comprising the steps of: a. unscrewing, with a driving tool, at least one coupling screw (52) threadably received within a female thread of the cutting insert (14) from a secured to a non-secured position; b. inserting a replacement cutting insert (14), or indexing the previously secured cutting insert (14); c. screwing the coupling screw (52) from the non-secured position to a secure position wherein the coupling screw (52) is threadably engaged in a corresponding female thread (78) in the cutting insert (14), and wherein a holding member (80) is in engagement with coupling screw thread (60) at least when the coupling screw (14) is in the non-secured position. ### Claim 26 (depends on 25) The method according to claim 25, wherein the method further comprises non-rotational axial movement of the coupling screw (52), whereby the holding member (80) adjusts relative to the coupling screw (52). ### Claim 27 (depends on 1) The cutting tool body (12) according to claim 1, wherein the tool coupling bore (42) is dimensioned such that the coupling screw (52) is fully retained within the tool coupling bore (42) when the coupling screw (52) is in the non-secured position.