| 摘要 |
Earthquake tremors dislodge a pedestal-mounted ball which then blocks the outlet passage of a casing installed in a gas line. To make the device more sensitive, the pedestal is spring-supported in the casing. Further, several balls may be suspended from wires in such position that, when they sway because of tremor, they knock the shut-off ball from the pedestal. The ball may be knocked from the pedestal in an emergency by kicking or rapping it. Additionally, the pedestal may be mounted on horizontal ball bearings with an adjustable compressive force which makes the shut-off ball especially sensitive both to vertical and horizontal tremors. In a severe emergency, such as an earthquake, the device saves lives and property by minimizing potential leakage and explosion from ruptured pipes.
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