Tien Hsin Industries Co., Ltd.

Wen-Feng Tsai

Wen-Nan Liao

Chia-Wei Liao

A bicycle cogset comprises a sprocket base, a first sprocket, and a second sprocket. A periphery of the sprocket base is provided with a plurality of connecting arms, and each of the connecting arms is provided with at least one first and one second connection hole respectively. The first sprocket has a first outer portion and a first inner portion, the first outer portion provided with a plurality of first teeth, the first inner portion provided with a plurality of first insertion members, and the first insertion members disposed in the first connection holes. The second sprocket has a second outer portion and a second inner portion, the second outer portion provided with a plurality of second teeth, the second inner portion provided with a plurality of second insertion members, and the second insertion members disposed in the second connection holes.

Bicycle cogset

A bicycle cogset manufacturing method includes: connecting a first and a second sprocket in different sizes with connecting members as a sprockets assembly in advance, where first and second inner portions of the first and second sprockets respectively have first insertion and second insertion members, and each of the insertion members are respectively provided with a first and a second positioning hole; transferring the sprockets assembly into a mold, and performing pouring to form a sprocket base, where an assembly hole is disposed in the center of the sprocket base, a plurality of connecting arms are arranged on an outer portion of the sprocket base, and the connecting arms clad the first insertion members and the second insertion members to form a cogset. In this way, modularization can be implemented to achieve objectives of preventing troublesome riveting, accelerating manufacture, and reducing product weight.

Method for manufacturing bicycle cogset

A bicycle rim includes a body having an axis defining a center thereof. The body includes an outer periphery and an inner periphery. The outer periphery and the axis have an outer radius therebetween, and the outer radius is constant. The inner periphery includes a first portion having a non-constant diameter.

Bicycle rim

A speed control device which is adapted to be used in connection with a derailleur type bicycle has one operation mode for up-shifting the speed and another operation mode for down-shifting the speed. The two operation modes can be affected by an operation lever, with the operation lever pivoted in a first plane for the up-shifting operation and in a second plane for the down-shifting operation.

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Taichung, Taiwan

Wen-Feng Tsai