| 摘要 |
A rotating seat pedestal has an outer tube, the wall of which has an I-shaped slot formed axially therein, telescoping over an inner tube connected to a floor base. The outer tube has brackets formed on either side of the slot, and a lever passing through the brackets has a pair of cam members mounted thereon, with one cam abutting each bracket. A sprocket is mounted on the lever intermediate the brackets. A spring-biased projection mounted transversely within the inner tube is shaped and dimensioned to protrude through the transverse portion of the slot when aligned therewith, thus indexing the seat pedestal in a forward-facing position. To lock the pedestal in a position other than forward-facing requires further turning of the lever in a first direction causing the first and second cams to pinch the brackets together thereby narrowing the slot and tightening the outer tube circumferentially onto the inner tube. The lever when rotated in a second directon loosens the outer tube and if locked in the forward-facing direction brings the sprocket into contact with the projection, forcing it inward to defeat the retaining action of the projection until the pedestal may rotate freely.
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