| 摘要 |
The inspection car is intended to inspect the lower side of the bridge construction of a high level road from above the high level road as well as from the ground and it comprises a swingable and extensible boom vertically swingably pivoted on a rotatable pedestal rotatably mounted on the chassis of the car about the vertical rotational axis of the pedestal, a reciprocal boom pivotally mounted on the tip of the swingable and extensible boom through a saddle, and an extensible inspection passageway pivotally connected to one end of the reciprocal boom, the passageway being swingable between a position parallel to the reciprocal boom and a position at right angle thereto while it is allowed to be rotated about the longitudinal axis of the reciprocal boom, a plurality of hydraulic cylinder means for the movement of the respective components listed above, and a control device for detecting the amount of movement of each component and controlling the movement thereof on the basis of the detected amount of movement of each component for the required operation of the inspection car. The control device has a function to judge the permission/inhibition of the movements of the respective components under predetermined conditions of the corelationship of the movements of the respective components.
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