| 摘要 |
An alarm system for protecting an area at least partially enclosed by flexible closure means, such as the load platform of a ''curtainsider''-type vehicle, includes sensor means associated with the closure means which are responsive to at least one of the following conditions: disturbance of the closure means; or separation of the closure means from an adjacent member. Preferably the sensor means comprises a network of conductors included with the closure means, together with conductors which connect an edge portion of the closure means to the adjacent member. The conductors may be connected into one or more circuits which may be connected into suitable alarm circuitry by means such as a radio link or an extendable conductor. The alarm is preferably operable in response to breaking a conductor upon attempting to cut or lift the closure means, but it may be responsive to vibration or the making of a circuit. |
