| 摘要 |
PROBLEM TO BE SOLVED: To easily open an automatic closing door and to close the door with the strong force when the door comes close to the closing position. SOLUTION: When opening the door, a main spring and an auxiliary spring are wound up, and after opening the door a little, wind-up of the auxiliary spring is stopped, and in the condition that the restoring force is maintained, the main spring is continuously wound up. The door is moved to the closing position by the restoring force of the main spring. Spring force of the main spring 15 is set smaller than that of a spring used for a conventional automatic closing device. The auxiliary spring 16 has the spring force larger than that of the main spring, and when the door comes close to the closing position, the auxiliary spring securely close the door in cooperation with the main spring.
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