Shift mechanism

Details Shift mechanism Shift mechanism

1990-06-25

1991-04-09

Wright, Dirk

Machine element or mechanism

Control lever and linkage systems

Elements

74536, 74535, 74475, G05G 506

Patent

active

050054384

ABSTRACT:
A multi-speed transmission has particular usefulness in bicycles, completely eliminating the use of the commonly used derailleur and the exposed flexible cable and the readjustment problems inherent with that prior structure. The transmission includes separate concentric gear rings which to a certain extent operate independently of each other. A shift mechanism for shifting the transmission is such the transmission can not be shifted from one gear to a non-adjacent gear without stopping at a gear therebetween. That is, no gear can be skipped. This is accomplished by a particular relationship of a pawl, a pusher, a shift segment plate and barrels mounted on the shift segment plate, among other parts.

REFERENCES:
patent: 616925 (1899-01-01), Heller
patent: 890964 (1908-06-01), Coffin
patent: 1622530 (1927-03-01), Miller
patent: 1974973 (1934-09-01), Paul

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