Tow truck system and tow truck therefor

Claim 1

IN A TOW TRUCK SYSTEM COMPRISING A REFERENCE SURFACE HAVING A MAIN SLOT AND AT LEAST ONE SHUNT SLOT ANGULARLY DISPOSED WITH RESPECT TO THE MAIN SLOT, A TRUCK MOUNTED FOR MOVEMENT ALONG THE MAIN SLOT, AN UPRIGHT TOW PIN ON THE TRUCK EXTENDING INTO THE MAIN SLOT, AT LEAST ONE ABUTMENT ON SAID SURFACE, TRANSFER MEANS ON THE TRUCK FOR COOPERATION WITH THE ABUTMENT TO CAUSE SAID TOW PIN TO BE TRANSFERRED FROM MOVEMENT ALONG THE MAIN SLOT TO MOVEMENT ALONG SHUNT SLOT, SAID TRANSFER MEANS INCLUDING A SELECTOR RACK, MEANS MOUNTING THE SELECTOR RACK ON THE FRONT END OF THE TRUCK FOR ROTATION ABOUT A SUBSTANTIALLY HORIZONTAL AXIS EXTENDING TRANSVERSELY ACROSS THE TRUCK, AT LEAST ONE SELECTIVELY POSITIONABLE TRIP ROD ON SAID RACK, SAID ROD BEING ADAPTED TO CONTACT SAID ABUTMENT TO CAUSE ROTATION OF SAID RACK ABOUT SAID AXIS, AND MEANS SUPPORTED BY SAID TRUCK AND STRUCTURALLY INTERRELATED WITH SAID RACK FOR CONTACT WITH A PORTION OF THE REFERENCE SURFACE TO INITIATE THE TRANSFER OF THE TOW PIN FROM MOVEMENT ALONG THE MAIN SLOT TO MOVEMENT ALONG THE SHUNT SLOT IN RESPONSE TO ROTATION OF SAID RACK ABOUT SAID AXIS.