Means for steerably interconnecting vehicles in tandem

Claim 1

A MOBILE UNIT COMPRISING A PAIR OF COMPONENTS EACH HAVING GROUND-ENGAGING SUPPORT MEANS MOVABLE ALONG THE GROUND AND THE CENTER OF GRAVITY OF EACH BEING LONGITUDINALLY BEYOND SAID SUPPORT MEANS SO THAT EACH UNCONNECTED TO THE OTHER COMPONENT WOULD TIP TOWARD THE GROUND, CONNECTING MEANS INTERCONNECTING THE COMPONENTS IN TANDEM SO AS TO PREVENT THE AFORESAID TIPPING AND PROVIDE FOR UNITARY LONGITUDINAL MOVEMENT OF THE COMPONENTS ALONG THE GROUND, SAID CONNECTING MEANS INCLUDING A STRUCTURE WHICH IS RIGID IN THE LONGITUDINAL VERTICAL PLANE AND ARTICULATED AT A LONGITUDINAL LOCATION FOR SWINGING MOVEMENT BETWEEN THE TWO PORTIONS THEREOF ADJACENT THE ARTICULATION IN THE HORIZONTAL PLANE, SAID TWO PORTIONS OF SAID STRUCTURE BEING ATTACHED TO THE COMPONENTS RESPECTIVELY SO AS TO PERMIT RELATIVE SWINGING MOVEMENT BETWEEN THE COMPONENTS SOLELY AT THE LOCATION OF ARTICULATION OF SAID STRUCTURE FOR PERMITTING LONGITUDINAL MOVEMENT OF THE UNIT ALONG THE GROUND SELECTIVELY IN STRAIGHT AND CURVED PATHS, SAID STRUCTURE SUPPORTING EACH COMPONENT LONGITUDINALLY BEYOND SAID SUPPORT MEANS IN THE DIRECTION OF THE END OF THE COMPONENT LONGITUDINALLY BETWEEN WHICH AND SAID SUPPORT MEANS THE CENTER OF GRAVITY OF THE COMPONENT IS LOCATED, ACTUATING MEANS COMPRISING MOTOR MEANS