| 摘要 |
A device that will automatically energize an Alarm Box, when an Over Navigable Water Bridge Section (ONWBS) collapses, said devise comprising two electric switches, each having two contact legs, one leg embedded steady on the base and the other leg free swinging on a pin. A spring is properly attached to keep the two legs closed, when free. Each switch, complete with Alarm Box, is installed in a secure place at each side of the protected section of the bridge A thin steel cable runs, through eyebolts, under the bridge, its ends connecting the free legs of the switches, and tightened enough to keep the switches electrically open. When the ONWBS is damaged and falls, the connecting cable will brake, releasing both switches to close and energize the Alarm Boxes, that will close the bridge gates at both entries, Light up Red Flashing Lights all over the area, Blow Horns, and telephone and radio the Local Police and Coast Guard, to inform them of the accident in order to assist and avoid additional collateral accidents.
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