| 摘要 |
PURPOSE:To both decrease weight of a hub and facilitate machining of a through hole and assembly of a spoke, by curving the central part of the wire spoke to be folded in a crank shape so as to connect both ends of the spoke to a rim while stop its curved part to a hub stopper part. CONSTITUTION:A curved part 16 folded in a crank shape is formed in almost the central part of a spoke 10. A flange 18 of major contour is formed being provided with a sprocket 20 in its outer end in one side of a hub 12, and a flange 22 of minor contour is formed in the other side. A plurality of protrusive piece parts 24, 26 are integrally formed in the flanges 18, 22, forming stopper parts 28, 30 for the crank shaped curved part 16 of the spoke. Then connecting both ends of the spoke 10 to a rim 14 through nipples 32, 34, the crank shaped curved part 16 is stopped to the stopper parts 28, 30 of the hub 12. By this constitution, weight of the hub can be decreased while machining of a through hole and assembly of the spoke can be facilitated. |
