| 摘要 |
PURPOSE:To obtain a delay action device with durability and no leak of liquid in an oil timer or the like of cylinder type, by applying a film formed to straight shape in its both end parts while tapered shape in its intermediate part. CONSTITUTION:A piston 3 is provided in a cylinder 1 equipped with a filer port 1-1 of liquid 2 in its bottom part. Further a grooved part 3-1 is formed in the piston 3 to both provide a valve member 7 so as to open-close operate the grooved part 3-1 and arrange a spring 9 resiliently moving the piston 3 upward. And if the grooved part 3-1 is opened at lowering time of the piston 3 and closed at rising time, timer action can be obtained. Further a film 5 is provided with large thickness straight parts 5-1, 5-2 in its both end parts 5-1, 5-2, medium thickness straight parts 5-3, 5-4 and a small thickness tapered part 5-5 in its intermediate part 5-5, respectively. In this way, a delay action device can be obtained capable of improving durability. |
