| 摘要 |
A trolley is provided with a number of wheels 4 each movable about a vertical axis, this movement being lockable by means of two inter-engaging sliding discs 3 operated by a hand control 5. The trolley may be a shopping trolley and the hand control may be mounted on the push handle 1. Alternatively the control may be remote. The locking movement may be produced manually, eg via cables 2, or electrically. The locking mechanism may be spring biased away from a locking position. The hand control may be locked in the position corresponding to the locked position of the wheels.
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