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US 12,667,196 B2Granted
Tilt control system for a chair
AssigneeSteelcase Inc.
InventorsKurt R. Heidmann, Russell T. Holdredge, Olukemi Chrissie Esi Johel, Gary Karsten, Nicholas Miles Krupansky, Nickolaus William Charles Deevers
Life of this patent
Estimating the term…
Abstract
A tilt control system includes a spring adjuster and compression spring, which may be removed in an unstressed condition. The tilt control system may also include a variable back stop having curved transition surfaces between the stop surfaces. A lumbar compensator may be integrated into a backrest, which may be coupled with a quick release to the base and actuated by sliding engagement with the seat.
Claims16
A tilt control system comprising:
- a base;
- a backrest pivotally coupled to the base about a first pivot axis, wherein the backrest is pivotable relative to the base between an upright position and a reclined position;
- a spring adjuster coupled to the base and comprising a vertically moveable coupling component, wherein the coupling component is reciprocally moveable along a first direction;
- and
- a compression spring having a first end coupled to the coupling component and a second end coupled to the backrest, wherein the compression spring extends rearwardly from the first end in a second direction transverse to the first direction, wherein the compression spring is compressible between a first condition when the backrest is in the upright position and a second condition when the backrest is in the reclined position, wherein the second condition comprises a greater degree of compression than the first condition.
2 more elements
Dependencies are inferred from the claim text.