Patent ID: 9451829
Filing Date: 2016-09-27
CPC Classification: A47C

Claim Text:
1. A foldable chair frame comprising: two spaced leg units, two spaced backrest units, a connecting unit, and a linkage unit, wherein: each of the two spaced leg units includes a front leg and a rear leg pivotally connected with the front leg; the two spaced backrest units are adjacent to the two spaced leg units respectively and are movable relative to the two spaced leg units to adjust a reclining angle of the two spaced backrest units relative to the two spaced leg units; the connecting unit is pivotally connected between the two spaced leg units and is collapsible to let the two spaced leg units approach each other; the linkage unit includes two spaced link modules pivotally connected between the two spaced backrest units and a pull rod connected with the two spaced link modules and extending upward and downward; each link module includes two links pivotally connected with the two spaced backrest units respectively; each of the two links has a first pivot portion pivotally connected with one of the two spaced backrest units and a second pivot portion located opposite to the first pivot portion; the linkage unit is movable between an expanded position and a folded position; when the linkage unit is disposed at the expanded position, each link module substantially extends leftward and rightward; when the linkage unit is converted from the expanded position to the folded position, the second pivot portion of each of the two links is moved upward gradually, and the first pivot portions of the two links approach each other gradually; when the linkage unit is disposed at the folded position, each link module is bent so that the two spaced leg units are moved toward each other; and when the linkage unit is disposed at the expanded position, the pull rod is pulled upward to drive the second pivot portions of the two links to move upward so that the linkage unit is converted from the expanded position to the folded position.