| 摘要 |
PROBLEM TO BE SOLVED: To provide an earthquake detection method for doors, etc. in which a ball moves to the lock position by shaking but is not kept there, and still secures the same lock effects as it is kept there, and to provide a shelf equipped with antiearthquake measures using this method. SOLUTION: In this earthquake detection method, the length of a lock area A8 having a linear vibration area is made longer than the diameter of a ball 9 so that the time when the ball stay at the lock area A8 is longer than the time when it stays at a stabilized position A9. The ball is moved to the lock position in accordance with a time lag (delay) of the open/close wave form of a door or the like from earthquake vibration wave form, but the lock can be secured to the same degree as holding the ball at the lock position without doing so. At the same time, an unlock system is simplified. COPYRIGHT: (C)2006,JPO&NCIPI
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