초록 ▼

The invention is particularly directed toward a safety device for a truck trailer having a valve, the valve having a casing rotatably mounting a valve spool therein. The casing has an air inlet, an air outlet, a vent outlet, and an alarm outlet. The spool has a passageway therethrough. The air inlet

The invention is particularly directed toward a safety device for a truck trailer having a valve, the valve having a casing rotatably mounting a valve spool therein. The casing has an air inlet, an air outlet, a vent outlet, and an alarm outlet. The spool has a passageway therethrough. The air inlet connects to connectable to an air compressor. The air outlet connects to the brakes of the trailer. The vent leads to the atmosphere. The alarm outlet leads to an alarm. The valve spool is selectivley rotatable within the casing to one of: a drive position where the valve connects the air inlet to the air outlet and blocks the vent and alarm outlets; a locked position where the valve connects the air outlet to the vent outlet and blocks the air inlet and alarm outlet; and an alarm position where the valve connects the air air inlet to the alarm outlet and blocks the air and vent outlets.

대표청구항 ▼

The invention claimed is: 1. A safety device for a trailer, the device having: a valve, the valve having a casing rotatably mounting a valve spool therein, the casing having an air inlet, an air outlet, a vent outlet, and an alarm outlet, separate from the air and vent outlets, therein; the valve s

The invention claimed is: 1. A safety device for a trailer, the device having: a valve, the valve having a casing rotatably mounting a valve spool therein, the casing having an air inlet, an air outlet, a vent outlet, and an alarm outlet, separate from the air and vent outlets, therein; the valve spool having a single passageway therethrough; the air inlet connectable to a first brake line section from a compressor; the air outlet connectable to a second brake line section leading to brakes on the trailer; the vent outlet leading to the atmosphere; the alarm outlet connectable to an alarm line leading to an alarm on the trailer; the valve spool rotatable within the casing to any one of: a drive position where the valve connects the air inlet to the air outlet via the passageway to unlock the brakes and blocks the vent and alarm outlets; a locked position where the valve connects the air outlet to the vent outlet via the passageway to vent the brakes and leave the brakes locked and blocks the air inlet and alarm outlet; and an alarm position where the valve connects the air inlet to the alarm outlet via the passageway to sound the alarm when an attempt is made to move the trailer with a truck cab and blocks the vent and air outlets. 2. A safety device for a trailer as claimed in claim 1 wherein the valve of the safety device is mounted on the inside of a side wall of the truck trailer adjacent the back of the trailer. 3. A truck trailer having rear wheels; a braking system for the rear wheels having brakes for the wheels, a brake line for connecting to an air compressor, the air compressor mounted on one of the trailer or a truck tractor used to pull the trailer, the brake line connecting the air compressor to the brakes; a safety device inserted into the brake line, the safety device having a valve, the valve having a casing rotatably mounting a valve spool therein, the casing having an air inlet, an air outlet, a vent outlet, and an alarm outlet, separate from the air and vent outlets; the valve spool having a single passageway therethrough; the air inlet connectable to the part of the brake line coming from the compressor; the air outlet connectable to the part of the brake line going to brakes on the trailer; the vent outlet leading to the atmosphere; the alarm outlet connectable to an alarm line leading to an alarm; the valve spool rotatable within the casing to any one of: a drive position where the valve connects the air inlet to the air outlet via the spool passageway to unlock the brakes and blocks the vent and alarm outlets; a locked position where the valve connects the air outlet to the vent outlet via the spool passageway to vent the brakes and leave the brakes locked and blocks the air inlet and alarm outlet; and an alarm position where the valve connects the air inlet to the alarm outlet via the spool passageway to sound the alarm when an attempt is made to move the trailer with a truck tractor and blocks the vent and air outlets. 4. A truck trailer as claimed in claim 3 wherein the valve of the safety device is mounted on the inside of a side wall of the truck trailer adjacent the back of the trailer.