# US 2019/0290975 A1 · Golf club set > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0290975 A1 - Document ID: US20190290975A1 - Status: Published application - Kind: A1 - Application number: 16/358,413 - Filed: 2019-03-19 - Published: 2019-09-26 - Earliest claimed: 2018-03-22 - Assignees: Sumitomo Rubber Industries, Ltd. - Applicants: Sumitomo Rubber Industries, Ltd. - Inventors: Tomotaka ARAMAKI - Web page: https://patentgrep.com/patent/US20190290975A1 ## CPC - A63B 53/0466: {wood-type} - A63B 53/005: {Club sets} - A63B 53/0408: {characterised by specific dimensions, e.g. thickness} - A63B 53/0437: {with special crown configurations} - A63B 53/047: {iron-type} - A63B 2102/32: Golf - A63B 2209/00: Characteristics of used materials - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) ## Abstract The present disclosure is a golf club set constituted by a plurality of golf clubs having different loft angles, each of the golf clubs has a shaft and a golf club head, and each of the golf club heads has a crown part, a face part, a sole part, and a hosel part to which the shaft is attached. ## Claims ### Claim 1 A golf club set constituted by a plurality of golf clubs having different loft angles, wherein each of the golf clubs includes a shaft and a golf club head, each of the golf club heads includes: a crown part; a face part; a sole part; and a hosel part to which the shaft is attached, in the face part, a lower edge line that is a boundary with the sole part curves so as to protrude downward, when a first point, a second point, and a third point are defined on the lower edge line, the first point being a lowermost point when the golf club head is in a reference state, the second point being a toe-side end, and the third point being a midpoint between the first point and the second point in a toe-heel direction, the lower edge line includes a first toe-side lower edge line that extends from the second point to the third point, and a second toe-side lower edge line that extends from the first point to the third point, and out of the plurality of golf clubs, at least a pair of a first golf club having a lower loft angle and a second golf club having a higher loft angle are configured such that a curvature radius of the first toe-side lower edge line of the second golf club is smaller than a curvature radius of the first toe-side lower edge line of the first golf club. ### Claim 2 (depends on 1) The golf club set according to claim 1, wherein a difference between the curvature radius of the first toe-side lower edge line of the first golf club and the curvature radius of the first toe-side lower edge line of the second golf club is within 20 mm. ### Claim 3 (depends on 1) The golf club set according to claim 1, wherein the plurality of golf clubs include a golf club in which the first toe-side lower edge line has a curvature radius of 20 to 40 mm. ### Claim 4 (depends on 1) The golf club set according to claim 1, wherein the first golf club and the second golf club are configured such that the curvature radius of the second toe-side lower edge line of the second golf club is larger than the curvature radius of the second toe-side lower edge line of the first golf club. ### Claim 5 (depends on 4) The golf club set according to claim 4, wherein a difference between the curvature radius of the second toe-side lower edge line of the first golf club and the curvature radius of the second toe-side lower edge line of the second golf club within 40 mm. ### Claim 6 (depends on 4) The golf club set according to claim 4, wherein the plurality of golf clubs include a golf club in which the second toe-side lower edge line has a curvature radius of 60 to 120 mm. ### Claim 7 (depends on 1) The golf club set according to claim 1, wherein a length of each of the golf club heads in the toe-heel direction is 60 to 120 mm. ### Claim 8 (depends on 1) The golf club set according to claim 1, wherein the crown portion of the golf clubs includes: a protruding part extending in a toe-heel direction along at least part of the face portion; a base part arranged further on a back side than the protruding part; and a step region extending in the toe-heel direction between the first region and the second region, and extending downward toward the second region from the first region side. ### Claim 9 (depends on 1) The golf club set according to claim 1, wherein the golf clubs are hybrid type golf clubs. ### Claim 10 A golf club set constituted by a plurality of golf clubs having different loft angles, wherein each of the golf clubs includes a shaft and a golf club head, each of the golf club heads includes: a crown part; a face part; a sole part; and a hosel part to which the shaft is attached, in the face part, a lower edge line that is a boundary with the sole part curves so as to protrude downward, when a first point, a fourth point, and a fifth point are defined on the lower edge line, the first point being the lowermost point when the golf club head is in a reference state, the fourth point being an intersection point of the lower edge line and a plane that passes through an intersection point of a center axis line of the shaft in the reference state and a placement surface and that is perpendicular to a toe-heel direction, and the fifth point being a midpoint between the first point and the fourth point, the lower edge line includes a first heel-side lower edge line that extends from the fourth point to the fifth point, and a second heel-side lower edge line that extends from the first point to the fifth point, and out of the plurality of golf clubs, at least a pair of a first golf club having a lower loft angle and a second golf club having a higher loft angle are configured such that a curvature radius of the first heel-side lower edge line of the second golf club is smaller than a curvature radius of the first heel-side lower edge line of the first golf club. ### Claim 11 (depends on 8) The golf club set according to claim 8, wherein the first golf club and the second golf club are configured such that the curvature radius of the second heel-side lower edge line of the second golf club is larger than the curvature radius of the second heel-side lower edge line of the first golf club. ### Claim 12 (depends on 8) The golf club set according to claim 8, wherein the crown portion of the golf clubs includes: a protruding part extending in a toe-heel direction along at least part of the face portion; a base part arranged further on a back side than the protruding part; and a step region extending in the toe-heel direction between the first region and the second region, and extending downward toward the second region from the first region side. ### Claim 13 (depends on 8) The golf club set according to claim 8, wherein the golf clubs are hybrid type golf clubs.