| 摘要 |
A castor for a chair comprises a wheel rotatably mounted in a housing which is pivotal about a substantially vertical axis spaced from the axis of the wheel. The housing includes an abutment surface arranged on the other side of the vertical axis to the axis of the wheel and extending below the axis of the wheel. When the chair is tilted, the abutment surface contacts the floor to prevent the chair from overturning.
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