| 摘要 |
A height-adjustable armrest includes a base securely joined a seat, a tube secured on the base, a rack on an inner side of the tube, and an armrest body inserted in the tube; a movable gear is fitted on the armrest body and engages the rack; the armrest body includes an immobilizing component, which is arranged above the movable gear, and can be moved up and down relative to the armrest body by means of a control member; the immobilizing component has an engaging toothed portion, and is spring-biased downwards to normally engage the movable gear, thus preventing the armrest body from moving accidentally; a co-moving rod is pivoted on the armrest body, and can be moved together with the immobilizing component so that the co-moving rod will engage the gear to help fix the armrest body when the immobilizing component is in the lower position to engage the gear.
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