Conveyors for conveying goods

Claim 1

A CONVEYOR COMPRISING A PLURALITY OF WHEELED GOODS SUPPORTING TROLLEYS EACH HAVING A FRONT AND REAR END, A PAIR OF TROLLEY SUPPORTING WHEELS ADJACENT EACH END, THE TWO WHEELS IN EACH PAIR SPACED TRANSVERSELY APART FROM ONE ANOTHER AND MOUNTED FOR ROTATION ABOUT A COMMON SUBSTANTIALLY HORIZONTAL AXIS, WITH THE AXES OF THE TWO PAIRS OF WHEELS BEING SUBSTANTIALLY PARALLEL TO ONE ANOTHER, A SUPPORTING TRACK FOR SAID TROLLEYS HAVING AN UPWARDLY DIRECTED LOAD SUPPORTING SURFACE ENGAGEABLE WITH SAID PAIRS OF TROLLEY SUPPORTING WHEELS, A POWER DRIVEN ELEMENT ADAPTED TO ADVANCE SAID TROLLEYS ALONG SAID TRACK, EACH TROLLEY HAVING A PAIR OF GUIDE WHEELS ROTATABLE ABOUT A VERTICAL AXIS, WITH THE TWO GUIDE WHEELS OF EACH PAIR BEING SPACED LONGITUDINALLY FROM ONE ANOTHER, AND EACH ENGAGEABLE WITH SAID TROLLEY TRACK, A PAIR OF INTERMEDIATE WHEELS ON EACH TROLLEY DISPOSED BETWEEN THE TWO PAIRS OF TROLLEY SUPPORTING WHEELS, MEANS MOUNTING SAID INTERMEDIATE WHEELS FOR ROTATION ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO THE AXES OF ROTATION OF THE TROLLEY SUPPORTING WHEELS, AND MEANS MOUNTING EACH OF THE TWO PAIRS OF TROLLEY SUPPORTING WHEELS IN A POSITION IN WHICH A FLAT PLANE TANGENTIAL TO THE TRACK ENGAGING UNDERSIDES OF THE TWO PAIRS OF TROLLEY SUPPORTING WHEELS IS A SHORT DISTANCE ABOVE THE TRACK ENGAGING UNDERSIDE OF THE INTERMEDIATE PAIR OF WHEELS, THE AXES OF ROTATION OF THE INTERMEDIATE WHEELS BEING SUBSTANTIALLY IN A VERTICAL PLANE PERPENDICULAR TO THE DIRECTION OF TROLLEY ADVANCEMENT WHEN THE TROLLEY IS LOADED, AND WITHIN WHICH VERTICAL PLANE LIES THE LOAD REACTION OF THE WEIGHT OF THE SUPPORTED GOODS ON THE TROLLEY, WHEREBY AT LEAST THE MAJOR PART OF THE LOAD IS SUPPORTED FROM THE TROLLEY TRACK THROUGH SAID INTERMEDIATE WHEELS WHEN THE TROLLEY ADVANCES HORIZONTALLY.