| 摘要 |
An adjustment device for an arm of a chair comprises a fixed tube member, an inner tube and an adjustment member. The fixed tube member is fixed to an upper side of the seat of the chair, and has rows of teeth on upright trenches on inner side thereof. The inner tube is movably received in the fixed tube member, and connected to the arm from an upper end. The adjustment member is fixed to an intermediate portion of the inner tube, and has cogs turnably disposed the teeth of the fixed tube member. An engaging member is movably disposed on the cogs; the engaging member is biased downwardly by a spring, and connected to a rope of a controlling member such that same can be lifted by pushing the controlling member. The engaging member has engaging teeth opposing the cogs such that the cogs are stopped from turning for fixing the adjustment member and the arm in position when the engaging member is not lifted. When the engaging member is lifted, the cogs can turn, permitting the arm to be adjusted to a desired position.
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