Hydraulic control system for trailer trucks

Claim 1

A CONTROL APPARATUS FOR CONTROLLING AND PREVENTING RELATIVE PIVOTAL MOVEMENTS BETWEEN A TRAILER AND A TRACTOR COUPLED TO SAID TRAILER, COMPRISING: HYDRAULIC CONTROL MEANS RESPONSIVE TO THE STEERING MECHANISM OF THE TRUCK, AND RESPONSIVE TO THE RELATIVE POSITION OF THE TRAILER TO THE TRUCK, PUMP MEANS ASSOCIATED WITH SAID HYDRAULIC CONTROL MEANS FOR RECEIVING HYDRAULIC RESPONSES FROM THE HYDRAULIC CONTROL MEANS, SAID PUMP MEANS OPERATING ONLY IN RESPONSE TO HYDRAULIC FLUID THROUGH SAID PUMP, FLOW CONTROL MEANS IN SAID HYDRAULIC CONTROL MEANS FOR DETERMINING THE FLOW AND THE DIRECTION OF FLOW OF HYDRAULIC FLUID THROUGH SAID PUMP, SAID FLOW CONTROL MEANS BEING ACTUATED BY SAID STEERING MECHANISM AND SAID RELATIVE POSITION OF THE TRAILER TO THE TRUCK, AND WHEREIN SAID FLOW CONTROL MEANS COMPRISES A FIRST VALVE SET AND A SECOND VALVE SET, SAID TWO VALVE SETS BEING MOVABLE TO SELECTED POSITIONS WHICH CONTROL THE FLOW OF HYDRAULIC FLUID THROUGH SAID HYDRAULIC CONTROL MEANS, A FIRST ACTUATING MEANS CONNECTING SAID FIRST VALVE SET TO THE STEERING MECHANISM OF THE TRUCK FOR MOVING SAID FIRST VALVE SET IN RESPONSE TO MOVEMENTS OF SAID STEERING MECHANISM, AND A SECOND ACTUATING MEANS CONNECTING SAID SECOND VALVE SET TO SAID TRAILER FOR MOVING SAID SECOND VALVE SET IN RESPONSE TO PIVOTAL MOVEMENTS OF THE TRAILER AND CONNECTION MEANS BETWEEN SAID PUMP AND SAID TRAILER, SAID CONNECTION MEANS BEING MOVABLE IN RESPONSE TO PIVOTAL MOVEMENTS OF SAID TRAILER, AND MOVEMENTS OF THE CONNECTION MEANS BEING CONTROLLED OR PREVENTED IN ACCORDANCE WITH FLOW AND DIRECTION OF FLOW OF HYDRAULIC FLUID THROUGH SAID PUMP, WHEREBY PIVOTAL MOVEMENTS OF SAID TRAILER WILL BE DETERMINED BY RESPONSES MADE BY THE HYDRAULIC CONTROL MEANS.