Backrest for chair

Abstract

A backrest for a chair, including a bag-like upholstery material, with which a back frame is upholstered by fitting the bag-like upholstery material onto the back frame that has a pair of right and left side frames extending in an up-down direction. A high-friction member is disposed on at least one of an inner surface of both side portions of the upholstery material on a lower portion side thereof supporting the sitting person around the hip and an outer surface of the right and left side frames contacting the inner surface of the side portions of the upholstery material on a lower portion side thereof, the high-friction member being configured to increase the sliding resistance in an area of contact between the upholstery material and the side frames

1 . A backrest for a chair, comprising a bag-like upholstery material, with which a back frame is upholstered by fitting the bag-like upholstery material onto the back frame that has a pair of right and left side frames extending in an up-down direction,
 wherein a high-friction member is disposed on at least one of an inner surface of both side portions of the upholstery material on a lower portion side thereof supporting the sitting person around the hip and an outer surface of the right and left side frames contacting the inner surface of the side portions of the upholstery material on a lower portion side thereof, the high-friction member being configured to increase the sliding resistance in an area of contact between the upholstery material and the side frames.   
     
     
         2 . The backrest for a chair according to  claim 1 , wherein stitched portions are formed by internally folding and stitching both side-end portions of the upholstery material to cause the upholstery material to be bag-like, each of the stitched portions being covered by a side-end portion of the high-friction member fixed by stitching. 
     
     
         3 . The backrest for a chair according to  claim 1 , wherein the high-friction member is formed by one of a polyurethane resin or a foam thereof, a urethane elastomer, and rubber.