Return mechanism for swivels

Claim 1

IN A PEDESTAL CHAIR: A PEDESTAL INCLUDING A SURBASE PART AND A BASE PART HAVING PERIPHERAL WALLS COMPLEMENTING EACH OTHER TO PROVIDE AN EXTERNAL CONTOUR OF THE PEDESTAL; MEANS MOUNTING SAID SURBASE PART FOR ROTATIONAL MOVEMENT ON SAID BASE PART ABOUT THE AXIS OF THE PEDESTAL; LOW FRICTION BEARING MEANS BETWEEN THE PEDESTAL PARTS; MEANS FORMING ON ONE OF SAID PARTS AN ENDLESS RACEWAY EXTENDING ENTIRELY ABOUT SAID AXIS AND BEING LOCATED INTERIORLY OF SAID WALLS; A THRUST MEMBER, MEANS CARRIED BY THE OTHER OF SAID PARTS GUIDING SAID THRUST MEMBER FOR MOVEMENT IN A PATH FIXED WITH RESPECT TO THE OTHER OF THE PARTS, SAID PATH INTERCEPTING SAID RACEWAY; SPRING MEANS URGING SAID THRUST MEMBER TO ENGAGE SAID RACEWAY; SAID THRUST MEMBER, SAID GUIDING MEANS AND SAID SPRING MEANS BEING LOCATED INTERIORLY OF SAID WALLS; AND MEANS HOLDING SAID PEDESTAL PARTS AGAINST SAID BEARING MEANS AND HOLDING SAID WALLS IN CLOSELY SPACED RELATIONSHIP AND PREVENTING RELATIVE AXIAL MOVEMENT OF THE PARTS AND PREVENTING SEPARATION OF SAID WALLS, THEREBY CONCEALING SAID THRUST MEMBER, SAID GUIDING MEANS, SAID SPRING MEANS, AND SAID RACEWAY WITHIN SAID WALLS; SAID THRUST MEMBER PERMITTING ENDLESS ANGULAR MOTION BETWEEN THE PARTS IN EITHER ANGULAR DIRECTION; SAID RACEWAY BEING DIVIDED INTO TWO SLOPING AREAS BY SPACED CREST TROUGH PORTIONS; WHEREBY THE THRUST MEMBER CREATES A TURNING TORQUE BETWEEN SAID PARTS WHENEVER THE THRUST MEMBER IS AWAY FROM SAID TROUGH PORTION.