US 11,753,097 B2
Seat cushion having an edge portion, to be used for a seat of saddle-riding vehicle, and manufacturing method thereof
Hideyoshi Sato, Shizuoka (JP); Tetsuya Mashiko, Shizuoka (JP); Sho Kakuta, Shizuoka (JP); Naoki Kinomoto, Shizuoka (JP); Yusuke Aoyama, Shizuoka (JP); Shigeyuki Ozawa, Shizuoka (JP); and Mikito Yokoyama, Osaka (JP)
Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA, Shizuoka (JP)
Filed by YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed on Mar. 24, 2022, as Appl. No. 17/703,464.
Claims priority of application No. 2021-052396 (JP), filed on Mar. 25, 2021.
Prior Publication US 2022/0306228 A1, Sep. 29, 2022
Int. Cl. B62J 1/18 (2006.01); B62J 1/00 (2006.01)
CPC B62J 1/007 (2013.01) [B62J 1/18 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A seat cushion for a saddle-riding vehicle, the seat cushion comprising:
an edge portion;
a three-dimensional fiber structure including core-sheath fusible fibers and skeletal fibers thermally fused at intersections thereof; wherein
sheaths of the core-sheath fusible fibers are made of a thermoplastic elastomer and form a bulging portion at each of the fused intersections;
the skeletal fibers and cores of the core-sheath fusible fibers are made of a non-elastomer resin;
the skeletal fibers are crimp-processed bulky fibers;
a fineness of the skeletal fibers and a fineness of the core-sheath fusible fibers are in a range of 1 to 200 dtex;
the seat cushion includes a layered structure including a plurality of layers fused together, and each of the plurality of layers includes the three-dimensional fiber structure; and
the seat cushion has a density distribution based on regional variations of the layered structure in the seat cushion and has a stiffness distribution that depends on the density distribution.