| 摘要 |
PURPOSE: To inexpensively provide an automatic opening and closing device automatically closing the discharge port of a discharging container at the mouth thereof as a simple structure hard to damage. CONSTITUTION: An automatic opening and closing device is constituted of a device base stand 1 having the outflow passage 1a communicating with a discharging container, the flexible film member 2 bonded to the upper surface of the device base stand 1 so as to leave the closing duct 4 formed of a non- adhesive part opened to the side surface 1d of the upper part of the device base stand 1 and communicating with an outflow passage 1a and the head member 3 fixed to the device base stand 1 to cover the film member 2. The gap part 5 permitting the expansion of the closing duct 4 is formed to the head member and the closing duct 4 is automatically opened and closed by the liquid pressure of a fluid and the restoring force of a film. |
