| 摘要 |
A steerable three-wheeled cart 10 has a frame 12 supported by a pair of nonsteerable rear wheels 32 and a steerable front wheel 38. The front wheel is mounted on a steerable wheel carriage 40 that is journalled to the frame for rotation of the carriage and wheel about a generally vertical axis. A handle 62 is pivoted to the wheel carriage to effect steering of the front wheel. The handle mounts a braking member 68 whose braking surface (72, Fig.3) is curved both longitudinally and laterally so as to conform substantially to the curvature of the front wheel. A braking force is applied to the front wheel by rocking the handle downwardly to cause the braking member to bear against the wheel while retaining the ability to steer the wheel with the handle.
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