Swivel chair

A swivel chair assembly comprising, in combination:

• an elongate, flat baseplate with raised longitudinal edges and a front portion adapted to be captured beneath a horizontal traverse of a work station fixture;
• a hollow, rectangular guide tube affixed longitudinally to said baseplate adjacent the front portion thereof and having an opening to the rear;
• an undercarriage means for supporting said chair upon said baseplate, comprising:
• a rectangular guide bar receivable telescopically on bearings in said guide tube and extending longitudinally of said baseplate,
• an axle portion received on a rear end of said guide bar and extending transversely of said baseplate between said raised edges thereof, and
• a roller received rotatably on each end of said axle portion inwardly of said raised edges of said baseplate and oriented to rotate as said undercarriage is translated along said baseplate;
• first and second telescopable columns, said first column being carried on said undercarriage at the rear end of said guide bar and extending vertically therefrom, and said second column being received rotatably in said first column and being adjustable vertically with respect thereto;
• chair means having a backrest portion and a seat portion carried on an upper end of said second telescopable column;
• a transverse tube on an upper end of said second column, the tube having ends pivotally connected to said chair means;
• said backrest portion spaced from and parallel to said transverse tube,
• said backrest portion including a longitudinal tube affixed thereto and a pivotable axle transversely connected thereto;
• and
• said axle having stop means limiting its pivotable orientation and carrying an armrest on either end thereof for selective storage in a substantially vertical position and use in a forwardly-pivoted position parallel to said seat portion of said chair means.