# US 2014/0152064 A1 · Item of seating furniture, in particular office chair

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- Number: US 2014/0152064 A1
- Document ID: US20140152064A1
- Status: Published application
- Kind: A1
- Application number: 14/123,618
- Filed: 2012-04-30
- Published: 2014-06-05
- Earliest claimed: 2011-05-06
- Assignees: Haworth, Inc.
- Inventors: Armin Sander; Martin Potrykus
- Web page: https://patentgrep.com/patent/US20140152064A1

## CPC

- A47C 7/44: with elastically-mounted frame
- A47C 7/28: with tensioned springs, e.g. of flat type
- A47C 7/405: {with double backrests}
- A47C 7/445: {with bar or leaf springs}
- A47C 7/448: {with resilient blocks}
- A47C: CHAIRS; SOFAS; BEDS

## Abstract

The invention relates to an item of seating furniture (2), in particular an office chair, with a substantially curved supporting shell (14) which has two raised, curved, flexible curved arms (24) and a rigid central piece (16) arranged between said curved arms. Furthermore, the item of seating furniture (2) comprises a covering (30) which is clamped in the manner of a secant between the curved arms (24) of the supporting shell (14), wherein, when the covering (30) is loaded, at least one curved arm (24) is at least partially increasingly raised and/or is at least partially curved in the direction of the central piece (16).

## Claims

### Claim 1

Item of seating furniture (2), in particular office chair, with a covering (30) and with a substantially curved supporting shell (14) which comprises two raised curved arms (24), which have a curvature, and a substantially rigid central piece (16) arranged between said curved arms, wherein the curved arms (24) are flexible, and wherein the covering is clamped in the manner of a secant between the two curved arms (24) of the supporting shell (14) in such a manner that, when the covering (30) is loaded, the curvature of at least one of the curved arms (24) changes.

### Claim 2 (depends on 1)

Item of seating furniture (2) according to claim 1, wherein the covering (30) is substantially free from extension.

### Claim 3 (depends on 2)

Item of seating furniture (2) according to claim 2, wherein the covering (30) indirectly or directly forms a seat surface.

### Claim 4 (depends on 3)

Item of seating furniture (2) according to claim 3, wherein the central piece (16) is held in a positionally fixed manner at at least two spaced-apart points.

### Claim 5 (depends on 4)

Item of seating furniture (2) according to claim 4, wherein the cross section of the curved arms (24) tapers from the central piece (16) to the respective ends (28) of said curved arms.

### Claim 6 (depends on 5)

Item of seating furniture (2) according to claim 5, wherein the curved arms (24) are manufactured from a permanently elastic material, in particular spring steel.

### Claim 7 (depends on 1)

Item of seating furniture (2) according to claim 1, wherein the curved arms (24) have a number of curved ribs (26) arranged parallel to one another.

### Claim 8 (depends on 7)

Item of seating furniture (2) according to claim 7, wherein the free end sides of two mutually adjacent curved ribs (26) at a time are connected to each other by means of a limb arc (32).

### Claim 9 (depends on 8)

Item of seating furniture (2) according to claim 8, wherein the covering (30) is a fabric which, at the curved-arm ends (40) thereof, has tabs (42) within which the corresponding curved arm (24) is located.

### Claim 10 (depends on 8)

Item of seating furniture (2) according to claim 8, wherein the covering (30) is essentially formed from a number of extension-free straps (34) which run parallel to one another, each of the straps (34) being clamped in the manner of a chord between the curved arms (24).