| 摘要 |
A tractor-trailer alarm system having mounted interior and exterior arming switches arranged in parallel either of which is operated by the tractor driver to arm the alarm system. The alarm system comprises a system of relays connected to the tractor batteries through the arming switches and further comprises a plurality of sensing switches, arranged in parallel, which trigger the relay system when actuated, such as by the unauthorized opening of a door. The relay system, in turn, is connected to one or more warning devices, such as a siren, which provides a warning when the relay system is triggered by the actuation of one of the sensing switches. The relay system is further connected to one or more essential components of the tractor engine, such as the fuel pump, which is disabled by the relay system when the relay system is triggered by one of the sensing switches. Once the relay system has been triggered by one of the sensing switches, the subsequent resetting of the sensing switch will not deactivate the alarm system. This alarm system is specially designed to be compatible with the electrical systems of tractor-trailers and to withstand the harsh environment and punishing conditions to which it will be exposed when installed in a tractor-trailer. |
