Dual lever type derailleur gear unit for a bicycle

Details Dual lever type derailleur gear unit for a bicycle Dual lever type derailleur gear unit for a bicycle

1998-05-06

1999-09-28

Luong, Vinh T.

Machine element or mechanism

Control lever and linkage systems

Hand operated

74142, 74475, 74489, B62M 2504, B62K 2306

Patent

active

059570024

ABSTRACT:
A derailleur gear unit includes a ratchet wheel rotatably mounted around a pivot base and formed with a plurality of teeth. A retaining disk is fixedly mounted around the pivot base, and a shank extends from an outer periphery of the retaining disk and is formed with a catch. A first shifting lever includes a first end portion, a mediate portion rotatably mounted around the pivot base, and a second end portion. A pawl member is pivotally mounted on the first end portion of the first shifting lever and includes an arcuate guiding track slidably abutting on the catch, and a detent meshing with one of the teeth of the ratchet wheel. A second shifting lever includes a first end portion pivotally mounted around the pivot base and a second end portion. A pushing rod located radially opposite to the detent of the pawl member is mounted on the first end portion of the second shifting lever and meshes with one of the teeth of the ratchet wheel.

REFERENCES:
patent: 5012692 (1991-05-01), Nagano
patent: 5213005 (1993-05-01), Nagano
patent: 5241878 (1993-09-01), Nagano
patent: 5287766 (1994-02-01), Nagano
patent: 5400675 (1995-03-01), Nagano
patent: 5701786 (1997-12-01), Kawakami
patent: 5730030 (1998-03-01), Masui
patent: 5732593 (1998-03-01), Hwang et al.

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