Chair, especially an office chair

Abstract

The invention relates to a chair, especially an office chair, having a seat part and a downward-slanting guide track for furnishing a combined downward and rearward motion or a combined upward and forward motion for the seat part. The seat part accordingly slides along a predetermined guide track, in many cases in cushioned fashion, to the rear and downward. To improve the ergonomics of such a chair, a swiveling device with an at least horizontal pivot shaft can be provided for pivotably disposing the seat part; the swiveling device is disposed between the seat part and the guide track, and the swiveling device is disposed so as to be movable together with the seat part along the guide track. As a result, a combined motion of the seat part can be generated, which is composed of the cooperation of the predetermined guide track and the swiveling motion about the pivot shaft of the swiveling device.

1 . A chair, especially an office chair, having a seat part ( 15 ) and a downward-slanting guide track ( 9 ) for furnishing a combined downward and rearward motion or a combined upward and forward motion for the seat part ( 15 ), characterized in that a swiveling device with an at least horizontal pivot shaft ( 13 ) is provided for pivotably disposing the seat part ( 15 ), and the swiveling device together with the seat part ( 15 ) is disposed as movable along the guide track ( 9 ).  
     
     
         2 . The chair of  claim 1 , characterized in that the guide track ( 9 ) is embodied as a sliding or rolling track.  
     
     
         3 . The chair of  claim 1  or  2 , characterized in that the maximum displacement travel of the swiveling device along the guide track ( 9 ) is greater than 30 mm, preferably 60 mm.  
     
     
         4 . The chair of one of claims  1 - 3 , characterized in that the maximum swiveling angle about the pivot shaft ( 13 ) of the swiveling device is greater than 5°, preferably 10°.  
     
     
         5 . The chair of one of claims  1 - 4 , characterized in that a coupling gear is provided, which force-couples the displacement motion along the guide track ( 9 ) and the swiveling motion about the pivot shaft ( 13 ) of the swiveling device.  
     
     
         6 . The chair of  claim 5 , characterized in that in a downward and rearward motion of the seat part ( 15 ), a swiveling motion about the pivot shaft ( 13 ) of the swiveling device is effected, to reinforce the downward motion of a rear seat part region.  
     
     
         7 . The chair of one of claims  1 - 6 , characterized in that the pivot shaft ( 13 ) of the swiveling device is disposed on a front seat part region ( 14 ).  
     
     
         8 . The chair of one of the foregoing claims, characterized in that the coupling gear includes a coupling element ( 17 ), which on the one hand is disposed pivotably about a basic swiveling point ( 10 ) with a horizontal swivel shaft spaced apart from the pivot shaft ( 13 ) of the swiveling device, and on the other hand is disposed spaced apart from the basic swiveling point ( 10 ) via a pivotable connection ( 20 ) with a horizontal pivot shaft, with the seat part ( 15 ) also spaced apart from the pivot shaft ( 13 ) of the swiveling device.  
     
     
         9 . The chair of  claim 8 , characterized in that the guide track ( 9 ) and the basic swiveling point ( 10 ) for the coupling element ( 17 ) are disposed stationary relative to one another.  
     
     
         10 . The chair of  claim 8  or  9 , characterized in that the coupling element ( 17 ) is embodied as a component part of a backrest ( 18 ).  
     
     
         11 . The chair of  claim 10 , characterized in that the coupling gear is embodied such that a support face ( 22 ) of the backrest ( 18 ) and a seat face ( 21 ) of the seat part ( 15 ) slant in force-coupled fashion rearward, by an angular ratio of 1.5:1 to 2.5:1, preferably 2:1, about the pivot shaft of the basic swiveling point ( 10 ) or downward about the swivel shaft ( 13 ), displaced along the guide track ( 9 ), of the swiveling device.  
     
     
         12 . The chair of one of claims  1 - 11 , characterized in that the swiveling device has a guide rail ( 11 ), which is guided displaceably along the fixed guide track ( 9 ).  
     
     
         13 . The chair of one of claims  1 - 12 , characterized in that the supporting of the swiveling device on the guide track ( 9 ) is effected essentially centrally to a surface to stand on.  
     
     
         14 . The chair of one of claims  1 - 12 , characterized in that a spring device is provided, counter to whose spring action at least the downward and rearward motion of the seat part ( 15 ) is effected.  
     
     
         15 . The chair of  claim 14 , characterized in that the spring device has an action direction which extends substantially along the guide track ( 9 ).  
     
     
         16 . The chair of  claim 14  or  15 , characterized in that the spring device includes an adjusting unit ( 12 ) for adjusting the spring action.  
     
     
         17 . The chair of one of claims  1 - 16 , characterized in that a damping device ( 25 ) is provided, which damps the swiveling motion of the swiveling device.  
     
     
         18 . The chair of  claim 17 , characterized in that the damping device ( 25 ) has an action direction which acts essentially perpendicular to a swiveling radius about the pivot shaft ( 13 ) of the swiveling device.  
     
     
         19 . The chair of  claim 17  or  18 , characterized in that the damping device ( 25 ) is provided with a progressively increasing damping action.  
     
     
         20 . The chair of  claim 19 , characterized in that the damping device ( 25 ) is embodied as an elastomer cushion.  
     
     
         21 . The chair of one of claims  5 - 20 , characterized in that a spring/damping device acts on the coupling gear and furnishes a progressively increasing spring/damping force, at least in the downward and rearward motion of the seat part ( 15 ).  
     
     
         22 . The chair of one of claims  1 - 21 , characterized in that the guide track ( 9 ) is curved convexly toward the seat part ( 15 ).  
     
     
         23 . The chair of  claim 22 , characterized in that the averaged theoretical center of curvature of the guide track ( 9 ) is located below a surface on which the chair is set up.  
     
     
         24 . The chair of one of claims  1 - 23 , characterized in that a columnar base frame is provided, on whose upper end region the guide track ( 9 ) is disposed.  
     
     
         25 . The chair of one of claims  1 - 24 , characterized in that the averaged theoretical center of curvature of the basic swiveling point ( 10 ) is located below a surface on which the chair is set up.  
     
     
         26 . The chair of  claim 24  or  25 , characterized in that the columnar base frame is embodied as adjustable in its height.  
     
     
         27 . The chair of one of claims  1 - 26 , characterized in that a headrest ( 31 ) is provided.  
     
     
         28 . The chair of  claim 27 , characterized in that the headrest ( 31 ) is joined to the seat part ( 15 ).  
     
     
         29 . The chair, in particular of one of the foregoing claims, having a pivotably disposed seat part ( 15 ), a pivotably disposed backrest ( 18 ), and a forced coupling for forced-coupled, boosted swiveling of the seat part ( 15 ) and backrest ( 18 ), characterized in that a headrest ( 31 ) is provided, which is motion-joined to the seat part.