| 摘要 |
A braking mechanism in a wheeled structure which is collapsible along an axis and is provided with at least two spaced wheels 11, each having a brake 10 and being mounted on that axis, incorporates a brake operating member which is movable between two stable positions in which the brakes are applied and are released respectively, and the operating member comprises an extendible bar having at least two members 41, 42 slidable relative to one another by means of cooperating surfaces along said axis operatively to connect the bar to the brakes in all states of collapse of the structure. Where the wheels have limited swivelling action, the bar is appropriately connected to each brake. <IMAGE>
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