B - Operations – Transporting – 62 – K
Patent
B - Operations, Transporting
62
K
22/176, 26/187,
B62K 3/02 (2006.01) B22D 19/04 (2006.01) B22D 23/00 (2006.01) B62K 19/18 (2006.01)
Patent
CA 1072598
Abstract of the Disclosure A bicycle frame comprised tubes closed at their ends and lugs for connecting the tubes to form the frame, which lugs are formed by die casting in dies in which the tubes are arranged so as to integrally surround the closed ends of the tubes by the die-cast lugs. The tubes are previously formed at their ends with tapered portions each extending from that corresponding to an extreme end of a boss of the lug surrounding the end of the tube toward an extreme end of the tube. The outer surfaces of the bosses of the die-cast lugs are in substantially constant outer diameter or slightly tapered, thereby, in conjuction with the tapered portions of the tube, eliminating stress concen- trations at the extreme ends of the bosses of the lugs, and saving the amount of the die-cast metal resulting into light weight bicycles which can save the driving power and cost of manufacture.
280810
Furusawa Michito
Gushima Mitsuo
Mabuchi Sadao
Toyomasu Takeshi
LandOfFree
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