| 摘要 |
PROBLEM TO BE SOLVED: To obtain a slip device whose respective slip torque in the valve closing operation and the valve opening operation is different from each other. SOLUTION: A click mechanism is used for slip. A notch is provided to make the click motion at the valve opening side more difficult than that of the valve closing side, at the valve opening side of a wall guiding a roll or a ball acting the click motion. Or a groove in which the roller or the ball for the click motion is fitted is deepened to make the click motion difficult to happen and further, a notch facilitating the click motion in the valve opening side than that in the valve closing side is formed at the corner of the valve closing side of the groove. Or the above both methods are used concurrently.
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