Chair

Abstract

The chair according to the invention has a seat, a backrest, a support frame, and at least one S-shaped leaf spring. The S-shaped leaf spring at a first section is fastened to the support frame, the seat is mounted at a second section, and the backrest is mounted at a third section. A first curvature is provided between the first and second sections, so that in a neutral position of the chair the first section and the second section are situated essentially in parallel to one another and are spaced apart, and the third section adjoins the second section via a second, opposite curvature. A compressible spacer that is displaceably guided in the longitudinal direction of the first section is provided between the first and the second section.

1 . A chair having a seat ( 1 ), a backrest ( 2 ), a support frame ( 3 ), and at least one S-shaped leaf spring ( 4 ), the S-shaped leaf spring ( 4 ) at a first section ( 4   a ) being fastened to the support frame ( 3 ), the seat being mounted at a second section ( 4   b ), and the backrest ( 2 ) being mounted at a third section ( 4   c ), and a first curvature ( 4   d ) being provided between the first section ( 4   a ) and the second section ( 4   b ), so that in a neutral position of the chair the first section ( 4   a ) and the second section ( 4   b ) are situated essentially in parallel to one another and are spaced apart, and the third section ( 4   c ) adjoins the second section ( 4   b ) via a second, opposite curvature ( 4   e ), and a compressible spacer ( 6 ) is provided between the first section ( 4   a ) and the second section ( 4   b ),
 characterized in that the compressible spacer ( 6 ) is displaceably guided in the longitudinal direction of the first section ( 4   a ).   
     
     
         2 . The chair according to  claim 1 , characterized in that only one S-shaped leaf spring ( 4 ), which is situated mirror-symmetrically with respect to the longitudinal center plane ( 7 ) of the chair, is provided. 
     
     
         3 . The chair according to  claim 1 , characterized in that the compressible spacer ( 6 ) is situated in a middle area of the first section ( 4   a ), between the fastening to the support frame ( 3 ) and the first curvature ( 4   d ). 
     
     
         4 . The chair according to  claim 1 , characterized in that the first section ( 4   a ) of the S-shaped leaf spring ( 4 ) has at least one recess ( 4   f ), in particular an elongated hole, extending in the longitudinal direction of the first section ( 4   a ) for displacement of the compressible spacer ( 6 ). 
     
     
         5 . The chair according to  claim 4 , characterized in that the compressible spacer ( 6 ) is connected to an actuating element ( 8 ) for displacing the compressible spacer ( 6 ) along the recess ( 4   f ) and for detachably fixing the compressible spacer ( 6 ) in a desired position. 
     
     
         6 . The chair according to  claim 5 , characterized in that the actuating element ( 8 ) is designed in such a way that a rotation of the actuating element ( 8 ) brings about a simultaneous displacement of the compressible spacer ( 6 ) along the recess ( 4   f ). 
     
     
         7 . The chair according to  claim 5 , characterized in that the recess ( 4   f ) is designed as an elongated hole with toothing ( 9 ), and the actuating element ( 8 ) is in operative engagement with the toothing ( 9 ), so that a rotation of the actuating element ( 8 ) brings about a simultaneous displacement of the compressible spacer ( 6 ) along the recess ( 4   f ). 
     
     
         8 . The chair according to  claim 7 , characterized in that the actuating element ( 8 ) and the elongated hole provided with the toothing ( 9 ) intermesh in the manner of self-locking lantern gear toothing. 
     
     
         9 . The chair according to  claim 1 , characterized in that the S-shaped leaf spring ( 4 ) is made of steel. 
     
     
         10 . The chair according to  claim 9 , characterized in that the steel has a yield strength of greater than 500 MPa. 
     
     
         11 . The chair according to  claim 1 , characterized in that the compressible spacer ( 6 ) has a progressive spring characteristic curve. 
     
     
         12 . The chair according to  claim 1 , characterized in that the compressible spacer ( 6 ) is formed by a coil spring made of steel and/or by a Cellasto disk. 
     
     
         13 . The chair according to  claim 1 , characterized in that armrests ( 5 ) which are fastened to the seat ( 1 ) or to the second section ( 4   b ) of the S-shaped leaf spring ( 4 ) are also provided. 
     
     
         14 . The chair according to  claim 1 , characterized in that the S-shaped leaf spring ( 4 ) is deflectable with regard to both bending and rotation. 
     
     
         15 . The chair according to  claim 14 , characterized in that the first section ( 4   a ) of the S-shaped leaf spring ( 4 ) has at least one recess ( 4   f ), in particular an elongated hole, extending in the longitudinal direction of the first section ( 4   a ) for displacement of the compressible spacer ( 6 ), and the recess ( 4   f ) extending in the longitudinal direction of the first section ( 4   a ) is designed in such a way that a rotation of the first section ( 4   a ) about a longitudinal center axis of the first section ( 4   a ) is facilitated. 
     
     
         16 . The chair according to  claim 1 , characterized in that the compressible spacer ( 6 ) with a first contact surface is displaceably guided on the first section ( 4   a ), and at its opposite end has a second contact surface on which the second section ( 4   b ) of the S-shaped leaf spring ( 4 ) is supported.