| 摘要 |
A retrofit kit for a portable scaffold having a relatively open frame supported for movement on a plurality of wheels and a platform for a worker disposed on the frame includes a wheel and a mount to mount the wheel to the open frame. The mount allows horizontal movement of the rotational axis of the wheel. The wheel may be steered by structure controllable from the platform to control the direction of the movement of the scaffold. A motor is provided and is operatively connected to the wheel for moving the scaffold in the direction selected by the steering means.
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