| 摘要 |
The present invention is relating to a pneumatic security circuit (Figure 6) , that provides the door leaf alongside of the seat to stay open at the buses having double door leaff and a foldable passenger seat under the condition that there is a passenger at the additional seat, free from the signal given by the driver of the vehicle for closing and opening the door. In the pneumatic circuit (Figure 6) subject to the present invention, there are two direction control valves (3, 4) that can chance their locations according to the position of the foldable seat, whether it is open or close. The valves concerned are at the door leaf which is at the same level the foldable seat, and they change their location in accordance with the signal they receive from the micro switch (5) at the foldable seat. When a passenger sits at the foldable seat, if a signal is given by the driver of the vehicle indicating that he is opening the front door, because of the position that the valves (3, 4) take as a result of the being open on the foldable seat, the staying close of the door leaf is provided. Thus, the door movements that may give harm to the passenger sitting at the foldable seat are prevented automatically. |
