Chair, in particular office chair

Patent metadata

Field	Value
Publication number	US-10058180-B2
Application number	US-201314422916-A
Country	US
Kind code	B2
Filing date	Aug 16, 2013
Priority date	Aug 23, 2012
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

Chair, more especially an office chair, comprising a seat plate ( 34 ) which is arranged on an undercarriage ( 12 ) and a backrest ( 14 ) which in the manner of a so called synchronous mechanism permit a synchronous movement of seat plate ( 34 ) and backrest ( 14 ), characterized in that the seat plate ( 34 ) is mounted laterally tiltable and the backrest includes two backrest supports ( 22, 24 ) whose lower ends are mounted pivotally independently of each other on the undercarriage ( 12 ) and are coupled in movement to the seat plate ( 34 ) in such a manner that by rearward pivoting of the support ( 22, 24 ) one side of the seat plate ( 34 ) is pressed down on the same side and the opposite side thereof is raised.

First claim

The invention claimed is:

1. An office chair ( 10 ), comprising:
a seat plate ( 34 ) which is arranged on an undercarriage ( 12 );
a backrest ( 14 ); and
a synchronous mechanism permitting a synchronous movement of the seat plate ( 34 ) and the backrest ( 14 ), wherein the seat plate ( 34 ) is mounted laterally tiltable about a longitudinal tilt axis (B) that extends in a forward direction from the backrest, and the backrest includes two backrest supports ( 22 , 24 ), the backrest supports having lower ends that are mounted pivotally independently of each other on the undercarriage ( 12 ) and are coupled in movement to the seat plate ( 34 ) in such a manner that by rearward pivoting of one of the supports ( 22 , 24 ) a first side of the seat plate ( 34 ) is pressed down so as to be tilted about the tilt axis (B) to a position below the tilt axis (B) and a second side opposite the first side is raised to a position above the tilt axis (B), wherein a tilt shaft extends in a longitudinal direction along tilt axis (B) for the lateral tilting of the seat plate ( 34 ) and lies in a vertical plane between the backrest supports ( 22 , 24 ).

2. The office chair according to claim 1 , wherein the lower ends of the backrest supports ( 22 , 24 ) are connected pivotally about a common horizontal pivot axis (A) to a base ( 20 ) of the undercarriage ( 12 ).

3. The office chair according to claim 2 , wherein on the first side and the second side beneath the seat plate ( 34 ), a set of bearings ( 44 ) are provided in which the lower ends of the backrest supports ( 22 , 24 ) lie in a region behind the pivot axis (A) thereof.

4. The office chair according to claim 3 , wherein the seat plate ( 34 ) is pivotal together with the lower ends of the backrest supports ( 22 , 24 ) about the pivot axis (A) thereof.

5. An office chair, comprising:
a seat plate ( 34 ) which is arranged on an undercarriage ( 12 );
a backrest ( 14 ); and
a synchronous mechanism permitting a synchronous movement of the seat plate ( 34 ) and the backrest ( 14 ), wherein the seat plate ( 34 ) is mounted laterally tiltable about a tilt axis (B) and the backrest includes two backrest supports ( 22 , 24 ), the backrest supports having lower ends that are mounted pivotally independently of each other on the undercarriage ( 12 ) and are coupled in movement to the seat plate ( 34 ) in such a manner that by rearward pivoting of the support ( 22 , 24 ) a first side of the seat plate ( 34 ) is pressed down so as to be tilted about the tilt axis (B) and a second side opposite the first side is raised, wherein the lower ends of the backrest supports ( 22 , 24 ) are connected pivotally about a common horizontal pivot axis (A) to a base ( 20 ) of the undercarriage ( 12 ) and wherein a tilt shaft extends along tilt axis (B) for the lateral tilting of the of the seat plate ( 34 ) and lies in a vertical plane between the backrest supports ( 22 , 24 ), wherein on the first side and the second side beneath the seat plate ( 34 ), a set of bearings ( 44 ) are provided in which the lower ends of the backrest supports ( 22 , 24 ) lie in a region behind the pivot axis (A) thereof, wherein the seat plate ( 34 ) is pivotal together with the lower ends of the backrest supports ( 22 , 24 ) about the pivot axis (A) thereof wherein in a rear region of the undercarriage ( 12 ) a bearing member ( 36 ) is mounted which is tiltable about the pivot axis (A) of the backrest supports ( 22 , 24 ) and supports a tilt shaft aligned along the tilt axis (B) of the seat plate ( 34 ).

6. The office chair according to claim 5 , wherein the seat plate ( 34 ) is arranged in a rear region of the seat surface and in a front region of the seat surface a front seat plate ( 32 ) is arranged, the front seat plate ( 32 ) having opposing sides, wherein a leg springs ( 48 ) extends rearwardly from each of said sides to support the rear seat plate ( 34 ) on both of the sides from below.

7. The office chair according to claim 6 , wherein the front seat plate ( 32 ) is carried by a front bearing member ( 50 ), the front bearing member having a rear end that is articulately connected to a front end of the bearing member ( 36 ), the front bearing member having a front end that is articulately connected to the front end of the base ( 20 ) lying therebelow via a connection member ( 52 ) which in its rear end receives the horizontal pivot axis (A) of the supports ( 22 , 24 ).

8. The office chair according to claim 1 , wherein the lower ends of the backrest supports ( 22 , 24 ) are formed by legs ( 30 ) angled forwardly in an L shape, the legs ( 30 ) having front portions ( 38 ) which are connected pivotally about substantially vertically directed axes (C) of rotation to the respective support ( 22 , 24 ) and the legs ( 30 ) having front ends which accommodate the horizontal pivot axis (A) of the supports ( 22 , 24 ).

9. An office chair, comprising:
a seat plate ( 34 ) which is arranged on an undercarriage ( 12 );
a backrest ( 14 ); and
a synchronous mechanism permitting a synchronous movement of the seat plate ( 34 ) and the backrest ( 14 ), wherein the seat plate ( 34 ) is mounted laterally tiltable and the backrest includes two backrest supports ( 22 , 24 ), the backrest supports having lower ends that are mounted pivotally independently of each other on the undercarriage ( 12 ) and are coupled in movement to the seat plate ( 34 ) in such a manner that by rearward pivoting of the support ( 22 , 24 ) a first side of the seat plate ( 34 ) is pressed down and a second side opposite the first side is raised, wherein the backrest supports ( 22 , 24 ) are connected in an upper region by a transverse member ( 54 ), the transverse member having ends that are articulately connected to the backrest supports ( 22 , 24 ), the ends forming connection points ( 56 , 58 ) between the backrest supports ( 22 , 24 ) and the transverse member, wherein a spacing is defined between the connection points ( 56 , 58 ), the articulate connection of the transverse member to the backrest supports ( 22 , 24 ) keeping the spacing between the connection points ( 56 , 58 ) constant without otherwise restricting a relative movement of the backrest supports ( 22 , 24 ) with respect to each other.

10. The office chair according to claim 9 , wherein the transverse member ( 54 ) is formed as a rod with variable length for adjusting the spacing between the connection points ( 56 , 58 ) at which the rod ( 54 ) is connected by ball joints ( 60 ) to the backrest supports ( 22 , 24 ).

Assignees

• Haworth Gmbh
• Haworth Inc

Inventors

• Desanta Simon

Classifications

• A47C7/024

  with double seats · CPC title

• A47C1/032 Primary

  the parts being movably-coupled seat and back-rest (A47C1/035 takes precedence) · CPC title

• A47C7/14

  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)} · CPC title

• A47C1/03255 Primary

  with a central column, e.g. rocking office chairs · CPC title

• A47C7/40

  for the back · CPC title