Patent ID: 7475943

Claim:
A chair, comprising: a base; a seat mounted on the base; a support bracket mounted on the seat; an upper backrest having an upper portion pivotally mounted on the support bracket; a lower backrest pivotally mounted on a lower portion of the upper backrest; wherein the support bracket has a first end formed with a horizontal fixing portion secured to the seat and a second end formed with an upright support portion; the upper backrest has a mediate portion pivotally mounted on the support portion of the support bracket; the support portion of the support bracket has an upper end provided with two opposite outwardly protruding pivot shafts; the mediate portion of the upper backrest has two opposite sides each formed with a pivot hole pivotally mounted on a respective pivot shaft of the support bracket; the upper end of the support portion of the support bracket is provided with two opposite upwardly protruding stop blocks each perpendicular to a respective pivot shaft; the upper backrest is pivotable relative to the support portion of the support bracket to rest on the stop blocks of the support bracket to prevent an excessive movement of the upper backrest relative to the support portion of the support bracket.