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US 11,510,363 B2Granted
Mower cord and manufacturing method for mower cord
AssigneeSanyo Tegusu Co., Ltd.
InventorsToshio Ishikawa, Shigeki Ichikawa, Masaya Suzuki
Life of this patent
Estimating the term…
Abstract
A manufacturing method for a mower cord and including 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.
Claims6
A method for manufacturing a mower cord, comprising:
- extruding a resin raw material and molding the resin raw material into a resin rod with a longitudinal axis and which has a rectangular or rhombic cross-sectional shape;
- stretching the resin rod;
- after the molding is complete, pressing the molded resin rod between a pair of pressure dies 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:
- each of the pressure dies has a groove which stores the molded resin rod,
- each of the pressure dies has a pair of flat pressing surfaces which extend on both sides of the groove,
- a maximum width Mw of the groove is set to be smaller than a maximum width Sw of the molded resin rod,
- the molded resin rod is pressed while part of the molded resin rod is sandwiched between a pair of the grooves,
- a cross-section of each groove is V-shaped, and
- a first pair of diagonal portions of the rectangular or rhombic cross-sectional shape of the molded resin rod engaged with the V-shaped grooves retain a diagonal shape and a second pair of the rectangular or rhombic cross-sectional shape not engaged with the V-shaped grooves are deformed by the pair of flat pressing surfaces.
7 more elements
A method for manufacturing a mower cord, comprising:
- extruding a resin raw material and molding the resin raw material into a resin rod having a longitudinal axis and a rectangular or rhombic cross-sectional shape;
- after the molding is complete, pressing the molded resin rod between a pair of pressure dies 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:
- each of the pressure dies has a groove which stores the molded resin rod,
- each of the pressure dies has a pair of flat pressing surfaces which extend on both sides of the groove,
- a cross-section of each groove is V-shaped,
- and
- a first pair of diagonal portions of the rectangular or rhombic cross-sectional shape of the molded resin rod engaged with the V-shaped grooves retain a diagonal shape and a second pair of the rectangular or rhombic cross-sectional shape not engaged with the V-shaped grooves are deformed by the pair of flat pressing surfaces.
5 more elements
Dependencies are inferred from the claim text.