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AssigneeTopy Kogyo Kabushiki Kaisha
InventorsKishiro Abe, Tsuneo Watanabe, Satoru Miyashita, Takenobu Hasegawa, Kenichi Inada, Shojiro Yokomizo, Shingo Tsukui, Katsuki Kato, Morishi Kunou, Katsunori Todoko, Kenji Hayashi, Nobuyuki Soma, Masaaki Hara
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A rim material having a non-uniform thickness, a rim manufactured from the rim material, and a method for manufacturing the rim from the rim material. The rim material includes a first material portion which forms an axially curved portion of the rim after the rim material is formed to the rim and a second material portion which forms an intermediate portion between adjacent axially curved portions after the rim material is formed to the rim. The first material portion has a thick parallel-surface portion including opposite surfaces parallel to each other. The parallel-surface portion has a width greater than a maximum amount of an axial dislocation of the parallel-surface portion expected to occur when the parallel-surface portion is formed to a corresponding curved portion. The second material portion has a thickness varying portion. The thickness varying portion includes a surface having a configuration defined by a line including a straight line and/or a slightly curved line.
A rim material for a rim having a non-uniform thickness, including a first material portion which forms an axially curved portion of the rim after the rim material is formed to the rim and a second material portion which forms an intermediate portion between adjacent axially curved portions after the rim material is formed to the rim, the axially curved portion of the first material portion including subportions, wherein a first subportion [A] is a curved portion between a first flange portion located at a first end of the rim and a first bead seat portion connected to the first flange portion, a second subportion [B] is a curved portion between a side-wall portion located on the first side of the rim and a drop portion, a third subportion [C] is a curved portion between a side-wall portion located on a second, opposite side of the rim and the drop portion, a fourth subportion [D] is a curved portion located at a root of a hump portion, a fifth subportion [E] is a curved portion located at a top of the hump portion, and a sixth subportion [F] is a curved portion between a second flange portion located at [a] the second, opposite end of the rim and a second bead seat portion connected to the second flange portion;
Dependencies are inferred from the claim text.