| 摘要 |
A front speed changing device comprises a base, a first link rod, a second link rod, a chain guiding member, a driven member, and a linking member, which form together a six-link-rod linking mechanism. The driven member is fastened with a pull cord. When the pull cord is pulled, the driven member swivels to link each rod member to engage in the swiveling action, thereby driving the chain guiding member to guide a chain to displace horizontally to attain the speed change.
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