Truck mounted load scale

Claim 1

A load indicating system for installation on a vehicle having an air pressure system, a load receiving bed and a wheel equipped axle, said system comprising in combination, a fluid reservoir for communication with the air pressure system of the vehicle for pressurizing the reservoir, air pressure control means in communication with said air pressure source and with said reservoir, a displacement cylinder in fluid communication with said reservoir and including extensible load indicator means, a scale proximate said load indicator means, fluid chargeable load cylinders with piston assemblies for installation on the vehicle frame above said axle, each of the load cylinders having internal biasing means normally raising the piston assembly to a retracted inoperable position, said piston assembly extensible upon load cylinder pressurization into contact with the vehicle axle prior to loading of the vehicle, conduit means communicating said reservoir with said load cylinders, each piston assembly adapted to be partially and upwardly displaced by closing movement between the trailer bed and the vehicle axle during loading of the vehicle bed, fluid valve means in conduit communication with said reservoir and displacement cylinder and said load cylinders whereby fluid discharged from the load cylinders during loading of the vehicle will be directed to said displacement cylinder to actuate the load indicator means, and repositioning of said fluid valve means and said air pressure control means permitting the normally raised piston assembly of each of the load cylinder to be retracted upwardly by the internal biasing means out of contact with the vehicle axle prior to vehicle travel.