| 摘要 |
The present disclosure is directed to a carwash system in which a boom is installed centrally on the ceiling of a vehicle wash bay and a tractor unit moves a carrier back and forth on the boom. The carrier supports a vertical and horizontal wash means each of which may be moved independently toward or away from the carrier to compensate for varying sizes of vehicles. The carrier has a swivel mounting between itself and the tractor for rotating the carrier in a horizontal plane. The vertical and horizontal wash means each have sonic transducers for establishing a sonar beam between the two means which will be broken by the presence and made by the absence of a vehicle in the wash bay beneath the boom. The sonic beam controls relay circuits for sequentially energizing and driving the tractor unit and the swivel drive on the carrier to move the wash means about the vehicle.
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