Power operated trailer brake system

Claim 1

IN COMBINATION WITH A TOWING VEHICLE HAVING A DISCONNECTIBLE COUPLING ELEMENT AND A TRAILER HAVING HYDRAULIC BRAKES, A FIRST HITCH MEMBER OF CHANNEL SECTION SHAPE WITH OPEN SIDE UP AND HAVING A FRONT END CARRYING A COUPLING MEMBER MATING SAID COUPLING ELEMENT OF THE TOWING VEHICLE, SAID TRAILER HAVING AT ITS FORWARD END, A SECOND CHANNEL SECTION SHAPED MEMBER WITH ITS OPEN SIDE DISPOSED DOWNWARDLY, VERTICALLY EXTENDING LONGITUDINALLY SPACED SIDE MEMBERS SECURED TO THE OUTER SIDES OF SAID CHANNEL-SECTION SHAPED MEMBERS, SAID FIRST HITCH MEMBER HAVING AN UPWARDLY EXTENDING PROJECTION AT ITS REAR END A HOUSING MOUNTED ON SAID FIRST HITCH MEMBER FOR MOVEMENT THEREWITH BETWEEN LIMITS DEFINED BY SAID SIDE MEMBERS, A SPRING TYPE SHOCK ABSORBER OPERATIVELY MOUNTED WITHIN SAID HOUSING, SAID SHOCK ABSORBER HAVING ONE END FIXEDLY MOUNTED ON SAID SECOND CHANNEL SECTION SHAPED MEMBER SPACED FROM THE FRONT END THEREOF AND HAVING ITS OTHER END CONNECTED TO SAID UPWARDLY EXTENDING PROJECTION AT A POINT SPACED FROM BOTH CHANNEL-SECTION SHAPED MEMBERS, A MASTER BRAKE CYLINDER SECURED TO SAID SECOND CHANNEL-SECTION SHAPED MEMBER AND HAVING A HYDRAULIC FLUID LINE CONNECTION WITH SAID BRAKES, A PISTON OPERATIVELY MOUNTED IN SAID CYLINDER, A PUSH ROD SOCKETED IN THE FORWARD END OF THE PISTON, SAID PUSH ROD EXTENDING THROUGH AN OPENING IN SAID UPWARDLY EXTENDING PROJECTION BELOW THE SHOCK ABSORBER, AND A SPRING MOUNTED ON SAID PUSH ROD AND REACTING AGAINST SAID UPWARDLY EXTENDING PROJECTION FOR TRANSFERRING FORCE FROM THE FIRST HITCH MEMBER TO THE PISTON AFTER A PREDETERMINED DISPLACEMENT OF THE SHOCK ABSORBER BY SUCH FORCE.