Title:
自転車用スプロケットアッセンブリ及び自転車用大スプロケット
Document Type and Number:
Japanese Patent JP3583385
Kind Code:
B2
Abstract:
A sprocket assembly is provided for a bicycle having a large sprocket S 1 and a small sprocket S2. The large sprocket S1 includes one or more chain support projections 10. 11 formed on the side surface 7 opposed to the small sprocket S2. Each projection 10, 11 includes a contact portion defining a contact surface for contacting, without meshing, a lower end of a chain 4 shifted from the small sprocket S2 to the large sprocket S1. The projections are arranged on the large sprocket S1 with a size and shape that allows the projections 10, 11 to pass between outer links prior to the gear-changing operation. The chain support projections 10, 11 are arranged for causing the contact surface to contact the chain 4 engaging the small sprocket S2 and pick up the chain 4 radially outwardly of the large sprocket S1 during a chain shift from the small sprocket S2 to the large sprocket S1.
Inventors:
Toshio Tezuka
Application Number:
JP2001187972A
Publication Date:
November 04, 2004
Filing Date:
June 21, 2001
Export Citation:
Assignee:
SHIMANO INC.
International Classes:
B62M9/00; B62M9/124; B62M9/1242; (IPC1-7): B62M9/12; B62M9/00
Domestic Patent References:
| JP5112278A | ||||
| JP5254482A | ||||
| JP6247376A | ||||
| JP8230749A | ||||
| JP2000355295A |
Foreign References:
| US5413534 |
Attorney, Agent or Firm:
Noboru Fujimoto
Seiichi Yakumaru
Hiroaki Nakatani
Tokuya Iwata
Seiichi Yakumaru
Hiroaki Nakatani
Tokuya Iwata