| 摘要 |
A horizontal scrubbing brush for a vehicle-washing apparatus is vertically guided on a support which is pivotally mounted on a portal frame for swinging about a horizontal axis, on either side of a normal vertical position, whenever the brush is deflected by contact with a transverse vehicular surface. If the swing exceeds a predetermined angle of inclination, a hoist motor is operated by an inclination-sensing switch to raise the rotating brush until the latter has returned to substantially its normal position, the weight of the brush being partly counterbalanced so that the brush bears under light pressure upon an adjoining generally horizontal vehicle surface after the hoist motor has been stopped. Another motor, controlled by the same switch, operated during standstill of the hoist motor to advance the portal frame with reference to the vehicle (or vice versa) to let the brush sweep the last-mentioned surface.
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