Chair having shape memory sponge mounted on backrest

Abstract

A chair having a shape memory sponge mounted on a backrest is invented that comprises a seat, a backrest, and a set of leg portions for supporting the seat and the backrest. The backrest includes a set of cut holes formed vertically to a given depth at both sides with respect to the center portion of the front surface thereof. A backrest cushion is inserted into each of the cut holes so as to protrude a given distance toward a user's back. The backrest cushion is formed of the shape memory sponge, and a fixing plate mounted at the rear side of each of the cut holes.

1 - 7 . (canceled) 
   
   
       8 . A chair having a seat, a backrest, a pair of arm rest and a set of legs for supporting the seat and the backrest, the chair comprising:
 a pair of backrest cushions ( 26 ) forming a shape memory sponge or foam having a rectangular pad shape with rounded top and bottom corners, a curved front surface being bumped-up nearby an inner edge and smoothly curved down to an outer edge and a flat rear surface,   a backrest frame ( 22 ) forming a spine-shaped surface curvature with a pair of cut-out holes ( 22   a ) being symmetrically arranged with respect to a center line of said backrest ( 20 ). the cut-out holes ( 22   a ) having a same shape of the backrest cushions ( 26 ),   a pair of auxiliary back plates ( 24 ) forming a concave basin having a same shape of the backrest cushions ( 26 ) for installing inside thereof, and for inserting into the cut-out holes ( 22   a ) of the backrest frame ( 22 ),   a fixing plate ( 28 ) forming the spine-shaped surface curvature for mounting behind the backrest frame ( 22 ), and   a rear cover plate ( 29 ) forming the spine-shaped surface curvature for mounting behind the fixing plate ( 28 ) to decoratively cover the backrest ( 20 ),   wherein a contour line of the front surfaces of the backrest cushions ( 26 ), which is bumped-up and smoothly curved down has a preset curvature to comfortably contact with a user's spine.   
   
   
       9 . The chair according to  claim 8 , wherein said backrest cushions ( 26 ) and said auxiliary back plates ( 24 ) are bonded each other by means of environmentally friend adhesive, and said auxiliary back plates ( 24 ) and said fixing plate ( 28 ) are fastened each other by means of bolts. 
   
   
       10 . A chair having a seat, a backrest and a set of legs for supporting the seat and the backrest, the chair comprising:
 a pair of backrest cushions ( 26 ) forming a shape memory sponge or foam having a rectangular pad shape with rounded top and bottom corners, a curved front surface being bumped-up nearby an inner edge and smoothly curved down to an outer edge and a flat rear surface, and   a backrest frame ( 22 ) forming a pair of concaved recesses, which are symmetrically arranged with respect to a center line of the backrest ( 20 ) for installing said backrest cushions ( 26 ) inside thereof;   wherein a contour line of the front surfaces of the backrest cushions ( 26 ), which is bumped-up and smoothly curved down has a preset curvature to comfortably contact with a user's spine.   
   
   
       11 . The chair according to  claim 10 , wherein said backrest cushions ( 26 ) are fastened to the concaved recesses by means of bolts.