| 摘要 |
A chair includes a seat and a rotational armrest apparatus mounted on the seat. The armrest apparatus includes a beam attached to the seat and an armrest rotationally mounted on the beam. The beam includes a socket formed thereon. The armrest includes a lower portion inserted rotationally in the socket and an upper portion for supporting an arm. The beam defines apertures through which fasteners can be driven into the seat for mounting the beam on the seat. The socket defines an upper space and a grooved recess communicated with the upper space. The lower portion of the armrest includes a toothed insert inserted in the grooved recess for retaining the armrest in position relative to the beam.
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