Self-propelled means for scaffolds

Claim 1

IN COMBINATION WITH A SCAFFOLD COMPRISING A SPACED FRONT AND REAR UPRIGHTS, A WORKING PLATFORM SUPPORTED BY SAID UPRIGHTS, A CASTER WHEEL AT THE BASE OF EACH UPRIGHT; AND UPPER AND LOWER TRANSVERSE CROSS MEMBERS EXTENDING BETWEEN SAID FRONT UPRIGHTS; A DETACHABLE GUIDE AND POWER UNIT INCLUDING A CYLINDRICAL SLEEVE; UPPER AND LOWER PLATES SECURED TO SAID SLEEVE; SPACED SERIES OF OPENING IN EACH SAID UPPER AND LOWER PLATES; BRACKETS SELECTIVELY ATTACHABLE IN SELECTED OPENINGS OF EACH SERIES FOR ENGAGEMENT WITH SAID UPPER AND LOWER TRANSVERSE MEMBERS RESPECTIVELY; A STEERING ROD EXTENDING THROUGH SAID SLEEVE, A STEERING HANDLE ON THE UPPER END OF SAID ROD ADJACENT SAID WORKING PLATFORM; MEANS PRECLUDING VERTICAL DISENGAGEMENT OF SAID ROD AND SAID CYLINDER; A STEERING FORK CARRIED BY THE LOWER END OF SAID STEERING ROD; AND AXLE EXTENDING TRANSVERSELY ACROSS SAID FORK, A STEERING AND POWER WHEEL MOUNTED ON SAID AXLE; A PLATFORM CARRIED BY SAID FORK; A MOTOR MOUNTED ON SAID PLATFORM AND HAVING A DRIVE SHAFT; A BELT AND PULLEY CONNECTION BETWEEN SAID DRIVE SHAFT AND SAID AXLE; AND MEANS FOR SUPPLYING ELECTRIC CURRENT TO SAID MOTOR.