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:
Apr. 30, 1996
Filed:
May. 26, 1994
Larry DeKraker, Holland, MI (US);
Richard P Thorn, Erie, PA (US);
Steelcase, Inc., Grand Rapids, MI (US);
Abstract
An adjustment mechanism for adjusting the height of a chair seat, table top or the relative position of other items includes an outer support tube and a telescoping, column tube subassembly. The column tube subassembly includes an inner support tube, a cylinder and a piston and piston rod subassembly. The piston rod is connected to the piston at one end and to the outer support tube at the other end. An elastomeric sleeve surrounds the cylinder. A valve controls flow of hydraulic fluid from the interior of the cylinder to and from an expandable chamber defined by the elastomeric sleeve. The piston snap-fits onto the piston rod and allows rotation of the column tube subassembly with respect to the outer support tube. A shock-absorbing element is disposed in the cylinder.