Yieldable caster

Claim 1

A CASTER COMPRISING A YOKE, A VERTICAL SHANK JOURNALED TO THE BIGHT PORTION OF SAID JOKE, A TRANSVERSE SHAFT OF SUBSTANTIAL LENGTH SECURED TO THE SIDE ARMS OF SAID YOKE, SLEEVE MEANS JOURNALED ON SAID SHAFT, A GENERALLY CLYINDRICAL RESILIENT WIRE MESH BASKET SECURED ON SAID SLEEVE MEANS AND EXTENDING AXIALLY FOR A SUBSTANTIAL PORTION OF THE LENGTH OF SAID SLEEVE MEANS, SAID WIRE MESH BASKET COMPRISING A FIRST CLOSED RESILIENT WIRE MEMBER FORMED WITH DIAGONALLY EXTENDING LOOPS HAVING INWARDLY EXTENDING SINUOUSLY CURVED END PORTIONS ANCHORED IN OPPOSITE END PORTIONS OF SAID SLEEVE MEANS, AND A SECOND CLOSED RESILIENT WIRE MEMBER INSIDE THE FIRST RESILIENT WIRE MEMBER FORMED WITH DIAGONALLY EXTENDING LOOPS UNDERLYING AND CROSSING THE LOOPS OF THE FIRST WIRE MEMBER AT SUBSTANTIAL ANGLES THERETO AT THE PERIPHERY OF THE WIRE MEMBER THE LOOPS OF SAID SECOND CLOSED RESILIENT WIRE MEMBER HAVING INWARDLY EXTENDING SINUOUSLY CURVED END PORTIONS ANCHORED IN SAID OPPOSITE END PORTIONS OF THE SLEEVE MEANS, THE SIDE ELEMENTS OF THE LOOPS OF AT LEAST ONE OF SAID CLOSED RESILIENT WIRE MEMBERS BEING SINUOUSLY CURVED, A RESILIENT DEFORMABLE OUTER TREAD SHELL SECURED ON SAID SLEEVE MEANS SURROUNDING AND RESILIENTLY ENGAGING SAID WIRE MESH BASKET, A PLURALITY OF SPACED RIGID SUPPORTING DISC MEMBERS MOUNTED ON SAID SLEEVE MEANS INSIDE SAID WIRE MESH BASKET, AT LEAST TWO OF SAID DISC MEMBERS BEING LOCATED INWARDLY ADJACENT THE RESPECTIVE ENDS OF SAID WIRE BASKET, AND RESPECTIVE RESILIENT COVER DISCS SECURED AROUND SAID SLEEVE MEANS IN THE OPPOSITE END PORTIONS OF SAID RESILIENT DEFORMABLE TREAD SHELL.