| 摘要 |
PURPOSE:To prevent a solenoid valve from performing misoperation due to vibration or the like by actuating an operating switch to operate the solenoid valve and continuing its operation by a memory unit, in case of the captioned device suitable for a vehicle performing work in a parking condition. CONSTITUTION:In an air brake device 10 containing a work auxiliary braking device suitable for a vehicle of crane truck or the like, compressed air in brake reservoirs 16a, 16b is supplied to an air over hydraulic(AOH) booster through double check valves 20a, 20b when a dual brake valve 18 is operated. While, when a solenoid valve 22 is operated, compressed air from a main reservoir 14 is supplied to the AOH booster. Here the solenoid valve 22 is controlled by a control circuit 30, containing a memory unit, in a manner wherein the solenoid valve 22 is opened, when an operating switch 46 is operated, continuing the operation while closed by controlling a release switch 38. |
