Truck trailer door-activated air brake release lock system for use with spring-set air-release trailer brakes

摘要

A truck trailer door-activated air brake release lock system for use with spring-set air-release vehicle brakes. The system includes a two-position two-port spool valve having a first port configured for fluid communication with a supply of pressurized air, a second port configured for fluid communication with the air release inlet port for a truck trailer brake; a spring-biased spool located within the body of the two-position two-port spool valve, the spool being configured to travel between a first position and a second position, wherein in the first position, the spool valve is in an open position allowing the first port and the second port to be in fluid communication, and wherein in the second position, the spool valve is in a closed position preventing a fluid communication between the first port and the second port; and a plunger configured for being coupled with a truck trailer door, the plunger dimensioned for engaging the spool, such that when the truck trailer door is closed, the plunger is in contact with the spool valve and causes the spool valve to be in the first position, and when the truck trailer door is not fully closed, the spool valve is in the second position.