| 摘要 |
An armrest for a chair includes an armrest frame formed with an elongated channel with a bottom opening, a hollow mounting seat disposed in the channel, and a shaft extending slidably through the mounting seat along an axis parallel to the armrest frame and having opposite ends secured to the armrest frame. The mounting seat has inner surfaces formed with retaining grooves that are registered with one another. Each of the retaining grooves is defined by a front vertical shoulder and a rear inclined shoulder. The inclined shoulder inclines downwardly and forwardly relative to the vertical shoulder. A locking plate is disposed in the mounting seat, and extends into the retaining grooves. The locking plate is formed with a locking hole between upper and lower sections thereof. The locking hole is slightly larger than cross-section of the shaft to permit extension of the shaft therethrough. The locking plate is movable between a locking position, in which the locking plate abuts against the inclined shoulders such that a peripheral wall that defines the locking hole frictionally engages the shaft, and a releasing position, in which the locking plate is disengaged from the shaft. A biasing spring biases the locking plate to the locking position.
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