Chair adjustment construction

摘要

A chair construction of the type including a base with an upstanding supporting tube and a seat with a depending tube telescopically fitted within the upstanding tube, includes an improved height adjustment mechanism for the seat. A manually operated handle or trigger on the upstanding tube has an inclined planar tab that fits into any one of a plurality of slots defined in the depending tube to provide desired seat elevation. The tubes have a hexagonal cross section with complementary wedge surfaces so that the depending tube is guided by the planar tab into wedging engagement with the upstanding tube.