| CPC A47C 1/0347 (2013.01) | 18 Claims |

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1. An adjustable bracket, comprising: a pedal rod group, a lumbar support rod group, a transmission rod, and a cushion bracket,
wherein the lumbar support rod group comprises at least a second connection rod, a third connection rod, and a fourth connection rod; and
the transmission rod is in a straight rod structure, a first end of the transmission rod is connected to the fourth connection rod, and a second end of the transmission rod is connected to the pedal rod group.
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