| 摘要 |
<p>The system automatically opens or closes the doors on one or both side of a wagon, particularly of "piggy back" type for carrying bulk material. It has primary rodding unlocking and opening the doors and secondary locking and closing them. A ratchet mechanism acts during closing of the doors, in conjunction with rollers. The locking is by a combination of shafts and cams and the weight of the load carried.</p> |
