Vertically adjustable cradle for a surface brushing machine

Claim 1

A CRADLE FOR ADJUSTABLY SUPPORTING A FLOOR OR GROUND SURFACE BRUSHING MACHINE COMPRISING A CHASSIS, SAID CHASSIS INCLUDING A PAIR OF PARALLEL SIDE BARS AND A CROSS BAR RIGIDLY SECURED TO THE REAR ENDS OF SAID SIDE BARS, A RECTANGULAR TOP FRAME, A PLURALITY OF SUBSTANTIALLY IDENTICAL TILTBARS, AT LEAST A PAIR OF SAID TILT BARS BEING PIVOTALLY MOUNTED ON EACH CHASSIS SIDE BAR AND PIVOTALLY SECURED TO CORRESPONDING BARS OF SAID TOP FRAME, SCREW THREADED MEANS SWIVELLY MOUNTED ON SAID CHASSIS CROSS BAR AND OPERATIVELY SWIVELED ON A CORRESPONDING PART OF SAID TOP FRAME FOR MOVING SAID TOP FRAME LONGITUDINALLY OF SAID CHASSIS TO THUS PIVOT SAID TILT BARS AND ADJUST THE DISTANCE OF SAID TOP FRAME AND CHASSIS RELATIVE TO EACH OTHER WHILE MAINTAINING THEM IN PARALLEL RELATION TO EACH OTHER, MANUALLY OPERABLE MEANS UNIVERSALLY CONNECTED TO SAID SCREW THREADED MEANS, AND STEERABLE WHEEL MEANS JOURNALED ON SAID CHASIS, SAID SCREW THREADED MEANS COMPRISING A BOLT, A NUT SWIVELLY MOUNTED ON SAID TOP FRAME, A SLEEVE THROUGH WHICH SAID BOLT ROTATABLY EXTENDS, SAID MEANS PREVENTING LONGITUDINAL MOTION OF SAID BOLT THROUGH SAID SLEEVE, MEANS FOR SWIVELLY MOUNTING SAID SLEEVE ON SAID CHASSIS, A PAIR OF HANDLE BAR RODS PIVOTALLY SECURED TO SAID FRAME, A HANDLE BAR AT THE END OF EACH HANDLE BAR ROD, A CROSS BRACE SECURING SAID HANDLE BAR RODS TOGETHER IN SPACED APART RELATION ADJACENT THEIR HANDLE BAR ENDS, SAID MANUALLY OPERABLE MEANS COMPRISING A CRANK JOURNALED THROUGH SAID CROSS BRACE, A CRANK HANDLE ON SAID CRANK ADJACENT SAID HANDLE BAR ENDS, A UNIVERSAL JOINT CONNECTING THE OTHER END OF SAID CRANK TO SAID SCREW THREADED MEANS, A PLATFORM MOUNTED ON SAID TOP FRAME AND A FLOOR OR GROUND BRUSHING MACHINE MOUNTED ON SAID PLATFORM, SAID MACHINE COMPRISING A MOTOR, A MOTOR SHAFT ROTATABLY EXTENDING DOWNWARDLY THROUGH SAID PLATFORM, AND A FLOOR OR GROUND SURFACE ENGAGING BRUSH DETACHABLY SECURED ON SAID MOTOR SHAFT BELOW SAID PLATFORM, WHEREBY OPERATION OF SAID CRANK HANDLE TO ROTATE SAID SCREW THREADED MEANS ADJUSTS THE PRESSURE SAID BRUSH PROVIDES ON THE SURFACE ON WHICH THE CRADLE IS SUPPORTED WHILE MAINTAINING THE SAME ANGLE OF THE PLANE OF ROTATION OF SAID IMPLEMENT.