SEATING WITH COMFORT SURFACE

• US 20070228800A1
• Filed: 06/04/2007
• Published: 10/04/2007
• Est. Priority Date: 09/12/2002
• Status: Active Grant

• Current Assignee: Steelcase Incorporated
• Original Assignee: Steelcase Incorporated
• Inventors: Heidmann, Kurt, Peterson, Gordon, Tubergen, Renard
• Granted Patent: US 7,360,835 B2
• Time in Patent Office: Days
• US Class Current: 297/452.630
• CPC Class Codes: A47C 1/023 the parts being horizontally-adjustable seats ; Expandable seats or the like, e.g. seats with horizontally adjustable parts
• CPC Class Codes: A47C 1/03238 by means of peg-and-notch or pawl-and-ratchet mechanism
• CPC Class Codes: A47C 1/03255 with a central column, e.g. rocking office chairs
• CPC Class Codes: A47C 1/03261 characterised by elastic means
• CPC Class Codes: A47C 1/03274 of torsion type
• CPC Class Codes: A47C 1/03294 slidingly movable in the base frame, e.g. by rollers
• CPC Class Codes: A47C 31/04 Clamps for attaching flat elastic strips or flat meandering springs to frames
• CPC Class Codes: A47C 7/14 of adjustable shape; elastically mounted ; adaptable to a user contour or ergonomic seating positions movably-coupled seat and backrests with elastic adjustment means A47C1/03261; elastically-mounted back-rests or backrest-seat units in the base frame A47C7/44
• CPC Class Codes: A47C 7/28 with tensioned springs, e.g. of flat type
• CPC Class Codes: A47C 7/38 for the head adjustable coupled to reclining or easy chairs A47C1/036
• CPC Class Codes: A47C 7/46 with special, e.g. adjustable , lumbar region support profile; "Ackerblom" profile chairs

Abstract

A chair includes a base, a seat, a back, and a control operably supporting the seat and back on the base for movement between upright and recline positions. The seat and back include a stiff perimeter frame with opposing perimeter sections, and a plurality of rods each independently bendable in vertical and angled directions. End bearings on the rods are captured in pockets in the perimeter frame, which limits their inward and outward sliding movement. The control includes front and rear leaf springs and a pivot arm operably supporting the seat and the back for synchronous movement, with the direction of movement being such that energy is stored during recline. The energy stored during recline assists in providing a heavier person with added counterbalancing force during recline. A booster mechanism is also selectively engageable for added support upon recline.

Claims

1. A seating unit comprising:

a base;

a seat operably supported by the base;

the seat including a frame adapted to support a seated user, the frame including opposing side sections, the seat further including resiliently-bendable longitudinally-stiff support members extending between the side sections;

the side sections each including front and rear portions defining a flex point therebetween that is adapted to permit a front portion of the side sections to flex downwardly to relieve pressure under a seated user'"'"'s knees and thighs, and each further including resilient support springs that extend between the front and rear portions to support and stiffen the side sections at the flex point.

2. The seating unit defined in claim 1, wherein the front portion is supported in cantilever off of the rear portion.

3. The seating unit defined in claim 1, wherein the seat further includes a seat support structure on the base, the frame being slidably supported on the seat support structure for depth adjustment.

4. A seating unit comprising:

a seat frame adapted to support a seated user, the seat frame having a main section and a front section positioned in a fore/aft direction in front of the main section and connected to the main section by a flexible section, the front and flexible sections being shaped and adapted to comfortably support a seated user'"'"'s thighs and knees; and

springs elongated in the fore/aft direction and extending across the flexible section and partially into each of the main and front sections for providing resilient support to the front section.

5. The seating unit defined in claim 4, wherein the flexible section includes a plurality of slots that selectively weaken the flexible section for controlled flexure.

6. The seating unit defined in claim 5, wherein at least half of the slots extend diagonally.

7. The seating unit defined in claim 4, wherein the plurality of slots form a pattern of at least two rows extending transversely, with each row including at least five slots.

8. The seating unit defined in claim 4, wherein the springs are embedded in the seat frame.

9. The seating unit defined in claim 4, wherein the springs comprise plastic molded components.

10. The seating unit defined in claim 4, wherein the springs comprise elongated flat plate springs.

11. The seating unit defined in claim 4, including a cushion positioned on the seat frame.