The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 2001
Filed:
Aug. 19, 1999
John L. Hendricks, Grand Rapids, MI (US);
Nancy A. Funk, Grand Rapids, MI (US);
Steelcase Development Corporation, Caledonia, MI (US);
Abstract
A chair base includes a tapered tubular center hub defining a longitudinal centerline and a plurality of radially extending tubular legs. Each leg has top, bottom, and opposing sidewalls defining a rectangular cross section that decreases as the leg extends from the hub. The top and bottom walls each have an arcuately shaped end that is welded to the center hub by top and bottom ring welds. The sidewalls of each leg have enlarged wall sections that are flat and parallel and further have bent flanges adjacent the hub that are angled inwardly from the enlarged wall sections toward the longitudinal centerline. The bent flanges are oriented approximately radially from the centerline to provide optimal structure and to provide clearance between adjacent legs. The clearance prevents interference between adjacent legs despite dimensional variation in the legs from manufacturing and tolerance considerations, thus facilitating assembly. The hub is formed from a constant-thickness wall to define a tapered one-piece tubular shape, with the constant-thickness wall having an inner surface defining a larger upper diameter and a smaller lower diameter for mateably receiving and stably supporting a tapered chair-supporting post.