Auxiliary caster for hand trucks

Claim 1

AUXILIARY CASTER MEANS FOR HAND TRUCKS, COMPRISING: A HAND TRUCK HAVING AN OPEN-WORK FRAME INCLUDING A SUBSTANTIALLY PLANAR LOAD-RECEVINGG PORTION AND A PAIR OF NON-CASTERED WHEELS NEAR ONE END OF THE FRAME; A TWO-PART CLAMP FOR ENGAGEMENT ABOUT A HAND TRUCK FRAME MEMBER AT A LOCATION REMOTE FROM THE MAIN WHEELS OF SAID TRUCK, SAID CLAMP COMPRISING A PAIR OF JAW MEMBERS OPPOSITELY GROOVED TO IN PART EMBRACE THE FRAME MEMBER AND TO PROTRUDE BEYOND THE PLANAR LOAD-RECEIVING PORTION, THERE BEING OPPOSED FLANGES ON SAID JAW MEMBERS AND FASTENERS PASSING THERETHROUGH TO SECURE THE SAME TOGETHER IN CLAMPING RELATION; A LEG EXTENDING FROM ONE OF SAID JAW MEMBERS OF SAID CLAMP IN A PLANE SUBSTANTIALLY PARALLEL TO SAID HAND TRUCK WHEELS, A CASTERED WHEEL ON THE OUTER END OF SAID LEG, SAID LEG BEING OF SUCH LENGTH THAT WHEN THE HAND TRUCK FRAME IS SUBSTANTIALLY HORIZONTAL THE CASTERED WHEEL AND HAND TRUCK WHEELS BOTH WILL BEAR WEIGHT FROM A SUPPORTING SURFACE; AND SAID CLAMP JAW MEMBERS ENGAGING THE HAND TRUCK FRAME MEMBER OVER A DISTANCE GREATER THAN AND EMBRACING SAID CASTERED WHEEL IN ITS VARIOUS RADIAL DISPOSITIONS.