GEAR CRANK FOR BICYCLE, AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a novel gear crank for a bicycle reduced in loss of material plates and capable of maintaining the predetermined rigidity or more of each gear in the condition that a plurality of gears are unified. SOLUTION: In this gear crank 1 for a bicycle, a plurality of gears a...

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Bibliographische Detailangaben
1. Verfasser:	NISHIMURA ATSUO
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CYCLES ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS POWERED PROPULSION OF SLEDGES OR RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES THERMAL INSULATION IN GENERAL TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a novel gear crank for a bicycle reduced in loss of material plates and capable of maintaining the predetermined rigidity or more of each gear in the condition that a plurality of gears are unified. SOLUTION: In this gear crank 1 for a bicycle, a plurality of gears are unified in parallel with each other so that diameter thereof is reduced in order from an outer side, and this gear set 2 is fixed to a boss part 41 of a crank arm 40 for fixation. Among the plurality of gears, a selected first gear is provided with an inward projection 14 to be fitted between gear teeth 33 of a second gear when the center of the first gear is overlapped with the center of the second gear selected on the small-diameter side of the first gear. This inward projection 14 forms a part of the first gear positioned in the most inside in the radial direction, and the first gear is connected to an adjacent gear on the small-diameter side near the inward projection 14. COPYRIGHT: (C)2004,JPO