# US 10,945,365 B2 · Mower cord and manufacturing method for mower cord > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,945,365 B2 - Document ID: US10945365B2 - Status: Granted - Kind: B2 - Application number: 15/553,866 - Filed: 2015-03-02 - Published: 2018-03-08 - Granted: 2021-03-16 - Earliest claimed: 2015-03-02 - Assignees: Sanyo Tegusu Co., Ltd. - Applicants: Sanyo Tegusu Co., Ltd. - Inventors: Toshio Ishikawa; Shigeki Ichikawa; Masaya Suzuki - Web page: https://patentgrep.com/patent/US10945365B2 ## CPC - A01D 34/4168: {Constructional details of the flexible lines} - A01D 34/73: Cutting apparatus - B26F 1/12: to notch margins of work - B29C 43/02: of articles of definite length, i.e. discrete articles {(B29C35/0227 takes precedence)} - B29C 43/021: {characterised by the shape of the surface} - B29C 43/22: of articles of indefinite length - B29C 43/222: {characterised by the shape of the surface} - B29C 43/224: {having a profiled section, e.g. tubes, rods} - B29C 43/226: {having a corrugated section} - B29C 48/00: Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C49/04) - B29C 55/00: Shaping by stretching, e.g. drawing through a die; Apparatus therefor (B29C61/08 takes precedence) - A01D: HARVESTING; MOWING - B26F: PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING (marking-out, perforating or making buttonholes A41H25/00; shoemaking A43D; surgery A61B; punching metal B21D; drilling metal B23B; cutting of metal by applying heat locally, e.g. flame cutting, B23K; cutting by abrasive fluid jets B24C5/02; details common to machines for severing B26D; drilling wood B27C; drilling stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; of glass C03B; of leather C14B; of textile materials D06H; for light guides G02B6/25; of tickets G07B) - 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) ## Abstract The present invention relates to a manufacturing method for a mower cord and includes pressing a resin wire rod and plastically deforming at least part of the wire rod in an axis perpendicular direction. Work-hardening of a surface of the plastically deformed portion allows dramatic enhancement of mowing efficiency. ## Claims ### Claim 1 A manufacturing method for a mower cord, comprising: extruding a resin raw material and molding the resin raw material into a resin rod having a longitudinal axis; after the molding is complete, pressing the molded resin rod between a pair of opposed pressing surfaces of a pressure die which approach the molded resin rod in a direction perpendicular to the longitudinal axis and plastically deforming by cold working at room temperature at least part of the molded resin rod in a direction perpendicular to the longitudinal axis; wherein: the pressure die includes a pair of opposed side walls oriented transversely to the pressing surfaces and each having an uneven shape; the pressing surfaces having outer edges shaped to conform with the uneven shapes of the side walls; a site where the at least part of the molded resin rod is cold-worked has a flat portion which is thinner than the molded resin rod before the pressing; the flat portion protrudes outwardly in a radial direction of the molded resin rod; a plurality of uneven portions which are continuous in a longitudinal direction of the molded resin rod are formed at the flat portion by the side walls such that outer distal edges of the uneven portions conform to the uneven shapes of the side walls; the flat portion and the uneven portions are formed simultaneously by the cold working; and the pressing is carried out by moving the opposed pressing surfaces relative to the side walls in a pressing direction perpendicular to the longitudinal axis of the molded resin rod. ### Claim 2 (depends on 1) The manufacturing method for the mower cord according to claim 1, wherein a cross-sectional shape of the molded resin rod is changed to an imperfect circular shape by the cold working. ### Claim 3 (depends on 1) The manufacturing method for the mower cord according to claim 1, wherein the flat portion is thinner, as measured in a direction corresponding to the pressing direction, than a thickness of the molded resin rod before the pressing. ### Claim 4 (depends on 1) The manufacturing method for the mower cord according to claim 1, wherein the outer distal edges of the uneven portions form ridges which extend in the longitudinal direction of the molded resin rod. ### Claim 5 (depends on 1) The manufacturing method for the mower cord according to claim 1, further including stretching the resin raw material. ### Claim 6 (depends on 1) The manufacturing method for the mower cord according to claim 1, wherein a cross-section in the direction perpendicular to the longitudinal axis of the molded resin rod has any one of a circular shape, an elliptical shape, a rectangular shape, and a rhombic shape. ### Claim 7 (depends on 1) The manufacturing method for the mower cord according to claim 1, wherein the pressure die includes a pair of opposed pressure dies which respectively define the opposed pressing surfaces, the opposed pressure dies being movable towards one another and relative to the side walls to sandwich the molded resin rod between the opposed pressing surfaces. ### Claim 8 (depends on 7) The manufacturing method for the mower cord according to claim 7, wherein: at least one of the pressure dies has a groove which stores the molded resin rod; and the molded resin rod is pressed while being held in place by the groove. ### Claim 9 (depends on 8) The manufacturing method for the mower cord according to claim 8, wherein the pressing surface of the one pressure die defines at least part of the groove and comes into contact with the molded resin rod. ### Claim 10 (depends on 8) The manufacturing method for the mower cord according to claim 8, wherein: the one pressure die has a pair of outer pressing surfaces disposed at opposite sides of the groove, each outer pressing surface extending towards an adjacent one of the side walls in a direction perpendicular to the longitudinal axis and forming part of the pressing surface of the one pressure die, the outer edges of the pressing surface of the one pressure die being disposed at respective terminal outer ends of the outer pressing surfaces of the one pressure die disposed immediately adjacent the respective side walls; and the molded resin rod is pressed by the outer pressing surfaces while being held by the groove to form the flat portion. ### Claim 11 (depends on 7) The manufacturing method for the mower cord according to claim 7, wherein at least one of the pressure dies has a tapered surface which comes into contact with the molded resin rod. ### Claim 12 (depends on 1) The manufacturing method for the mower cord according to claim 1, wherein the pressing and cold working causes accumulation of internal strain in the flat portion. ### Claim 13 (depends on 1) The manufacturing method for the mower cord according to claim 1, further comprising sandwiching the molded resin rod between the opposed pressing surfaces and between the side walls to simultaneously form the flat portion and the uneven portions by the cold working. ### Claim 14 (depends on 1) The manufacturing method for the mower cord according to claim 1, wherein the uneven shapes of the respective side walls of the pressure die and the uneven shapes of the outer edges of the pressing surfaces comprise longitudinally extending undulations. ### Claim 15 A method of manufacturing a mower cord, said method comprising the steps of: forming a solid resin rod from a resin raw material, the solid resin rod having a longitudinal axis; thereafter pressing the solid resin rod between a pair of opposed pressing surfaces of a pressure die which are movable in a pressing direction perpendicular to the longitudinal axis and plastically deforming by cold working at room temperature part of the solid resin rod in a direction perpendicular to the longitudinal axis to form a flat portion that is thinner than the solid resin rod before the step of pressing and cold working, the flat portion protruding outwardly in a radial direction of the solid resin rod; wherein the step of pressing and cold working, simultaneously with forming the flat portion, forms a plurality of uneven portions along the flat portion with opposed and uneven side walls of the pressure die such that the plurality of uneven portions extend continuously in the longitudinal direction of the solid resin rod and such that outermost edges of the uneven portions conform to the opposed and uneven side walls, wherein outer edges of the pressing surfaces disposed immediately adjacent the respective side walls have shapes which respectively conform thereto; and wherein the step of pressing and cold working includes moving the opposed pressing surfaces towards the solid resin rod and along and relative to the side walls. ### Claim 16 (depends on 15) The manufacturing method according to claim 15, wherein the pressure die includes a pair of pressure dies which respectively define the opposed pressing surfaces and which pressure dies are movable towards one another to sandwich the molded resin rod between the opposed pressing surfaces. ### Claim 17 (depends on 15) The manufacturing method for the mower cord according to claim 15, wherein the step of pressing and cold working includes sandwiching the molded resin rod between the pressing surfaces and between the side walls to simultaneously form the flat portion and the uneven portions.