| 摘要 |
PURPOSE:To simplify a driving gear and reduce the cost by providing the solenoid valve of a door opening or closing device, with an oxhaust port having an orifice, and by providing a space between the solenoid valve and an air source, with an emergency cock that can communicate with an external section, to fill the role of a relief valve, too. CONSTITUTION:In a door driving gear 10 provided with an air piston 15 for opening or closing a door 11, a solenoid valve 1 having an orifice on an exhaust port is set. Besides, between the solenoid valve 1 and an air tank 3, an emergency cock 2 having an exhaust port to be communicating with an external section, and a shock-proof valve 20 are arranged. Then, normally to an air cylinder 18, air is fed with the operation of the solenoid valve 1, and the door 11 is opened or closed, and in the case of emergency, the emergency cock 2 is operated, and the air of a first working chamber 16 is removed from, and the door 11 is released. As a result, a relief valve is not required, and the gear can be simplified. |
