# US 8,465,612 B2 · Tubular body > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,612 B2 - Document ID: US8465612B2 - Status: Granted - Kind: B2 - Application number: 12/890,057 - Filed: 2010-09-24 - Published: 2011-03-31 - Granted: 2013-06-18 - Earliest claimed: 2009-09-25 - Assignees: SRI Sports Limited - Applicants: Tomio Kumamoto - Inventors: Tomio Kumamoto - Web page: https://patentgrep.com/patent/US8465612B2 ## CPC - A63B 53/10: Non-metallic shafts - A63B 60/00: Details or accessories of golf clubs, bats, rackets or the like - B29C 70/30: Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core - A63B 49/10: made of non-metallic materials, other than wood - A63B 60/06: Handles - A63B 60/08: characterised by the material - A63B 60/10: with means for indicating correct holding positions (A63B60/12 takes precedence) - A63B 2209/023: Long, oriented fibres, e.g. wound filaments, woven fabrics, mats - A63B 2209/026: Ratio fibres-total material - B29K 2105/246: {Uncured, e.g. green} - B29L 2023/00: Tubular articles (B29L2024/00 takes precedence {; catheters B29L2031/7542}) - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract In this manufacturing method, a tubular body 18 having a rib 16 provided therein is obtained. The manufacturing method includes the steps of: preparing a mandrel 2 divided into two or more divided bodies d1 along a longitudinal direction of the mandrel 2; winding a prepreg r1 for a rib around at least one of the divided bodies d1; combining all the divided bodies d1 to obtain a first intermediate body 10 after the step of winding the prepreg r1 for the rib; winding a prepreg g1 for the outer peripheral part around an outside of the first intermediate body 10 to obtain a second intermediate body; heating the second intermediate body to obtain a cured laminate; and extracting the mandrel 2 from the cured laminate. Preferably, the mandrel is equally divided in a circumferential direction. Preferably, a winding start end part t2 of the prepreg r1 for the rib and a winding finish end part t1 thereof overlap with each other. ## Claims ### Claim 1 A manufacturing method of a tubular body having a rib provided therein, comprising the steps of: preparing a mandrel divided into two or more divided bodies along a longitudinal direction of the mandrel; winding a prepreg for a rib around at least one of the divided bodies such that a first end portion of the prepreg and a last end portion of the prepreg overlap; combining all the divided bodies to obtain a first intermediate body after the step of winding the prepreg for the rib; winding a prepreg for an outer peripheral part around an outside of the first intermediate body to obtain a second intermediate body; heating the second intermediate body to obtain a cured laminate; and extracting the mandrel from the cured laminate. ### Claim 2 (depends on 1) The manufacturing method according to claim 1, wherein the mandrel is equally divided in a circumferential direction; the number of divided bodies is even; and the divided bodies are disposed such that a divided body around which a prepreg is wound, and a divided body without a wound prepreg alternate the circumferential direction in the mandrel. ### Claim 3 (depends on 1) The manufacturing method according to claim 1, wherein a prepreg for a rib is wound around all the divided bodies. ### Claim 4 (depends on 1) The manufacturing method according to claim 1, wherein the prepreg for a rib has a longitudinal length that is shorter than the full length of the tubular body; the prepreg for a rib is wound around a portion of a length of the divided body; the rib is disposed on a portion of a length of the tubular body; and a longitudinal position of the rib can be adjusted based on the winding position of prepreg for a rib in the divided body. ### Claim 5 (depends on 1) The manufacturing method according to claim 1, wherein the prepreg for a rib is wound around at least one of the divided bodies corresponding to a number greater than 1.00. ### Claim 6 (depends on 1) The manufacturing method according to claim 1, wherein the divided body around which a prepreg is wound has an outer surface and a rib surface; a first end portion of the prepreg for the rib and a last end portion of the prepreg for the rib are butted to each other to form an abutment; and the abutment is located on the outer surface of the divided body. ### Claim 7 (depends on 1) The manufacturing method according to claim 1, wherein prepregs for ribs are each wound around a divided body such that a first end portion overlaps with a last end portion at an overlapping section; and the overlapping sections are substantially disposed at equal intervals in a circumferential direction. ### Claim 8 (depends on 1) The manufacturing method according to claim 1, wherein the divided body around which a prepreg for a rib is wound has an outer surface and a rib surface; the prepreg for a rib is wound such that a first end portion overlaps with a last end portion at an overlapping section; and the overlapping section is located on the outer surface of the divided body. ### Claim 9 (depends on 1) The manufacturing method according to claim 1, wherein the divided body around which a prepreg for a rib is wound has an outer surface and a rib surface; the prepreg for a rib is wound such that a first end portion overlaps with a last end portion at an overlapping section; and the overlapping section is located at a boundary between the rib surface of the divided body and the outer surface of the divided body. ### Claim 10 (depends on 1) The manufacturing method according to claim 1, wherein an angle θ1 between a direction of a fiber of the prepreg for the rib and a longitudinal direction of the tubular body is 70 degrees or greater and 110 degrees or less.