| 摘要 |
<p>A locking device (10) for immobilizing trailers (12) to prevent unauthorized movement or theft of the trailer (12) by venting the compressed air that is used to release the brakes. The locking device (10) has a controller unit (20), a control valve (30) and power source (26) mounted inside a housing (16). A control mechanism (14), such as a keypad or key lock system, is located outside of the housing (16), preferably on a trailer wall (50). The inlet (42) on the control valve (30) connects to the brake line (34) that delivers compressed air to the trailer's compressed air operated brakes. In the locked condition, the control valve (30) is set so compressed air vents out the control valve's outlet (44), preventing release of the brakes. When the proper lock code, key or other signal is received, the control valve (30) closes the outlet (44) to stop the venting and allow the brakes to be released.</p> |
