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An earthquake safety system employing a shock triggered electrical switch for opening electrical contacts in the cables between the power utility input to a building and the distribution circuit breaker box. The switch is adjustable to be closed by earthquakes of predetermined magnitudes. Normally-c

An earthquake safety system employing a shock triggered electrical switch for opening electrical contacts in the cables between the power utility input to a building and the distribution circuit breaker box. The switch is adjustable to be closed by earthquakes of predetermined magnitudes. Normally-closed solenoid gas and water valves coupled to breakers in the circuit breaker box will close upon the opening of the contacts to prevent gas fire and water damage and loss of water main pressure.

대표청구항 ▼

A safety system for instantaneously switching off electricity upon occurrence of a shock of predetermined magnitude, said system including: a power distribution box having an input terminal and a plurality of electric output terminals; an electrical power contactor connected into the electrical path

A safety system for instantaneously switching off electricity upon occurrence of a shock of predetermined magnitude, said system including: a power distribution box having an input terminal and a plurality of electric output terminals; an electrical power contactor connected into the electrical path between input power terminals of the safety system and said distribution box input terminals, the contacts of said contactor being closed by current flow through a first electrical winding and being opened by current flow through a second electrical winding; and an adjustable shock-sensitive switch coupled between one of said input power terminals and said second electrical winding, said shock-sensitive switch comprising: a vertical tubular non-conductive housing having a first electrical conductor overlying the internal floor thereof, said conductor being a first electrical terminal of said switch; an electrically conductive fluid within said non-conductive housing, said fluid overlying said first electrical conductor; a core member vertically slidable within the bore of said housing, said core member having an electrically conductive floor providing a second electrical terminal of said switch, the bottom surface of said electrically conductive floor being spaced from the top surface of said conductive fluid; and means coupled between said core member and said housing for clamping said member and said housing against relative vertical movement.