Chair with a Resilient Back

Abstract

A chair with a resilient back contains a back member, a cushion, and a support member, characterized in that: the support member includes a horizontally hollow tube in which an elastic mechanism is disposed, the back member includes two pressed pieces fixed on two sides thereof respectively, lower ends of the two pressed pieces connect with two ends of the elastic mechanism individually, and the cushion is secured on the support member, wherein the elastic mechanism is a torsion spring, a middle section of the elastic mechanism is fixed, and two outer ends of the torsion spring are coupled with the lower end of the pressed piece.

1 . A chair with a resilient back comprising:
 a back member, a cushion, and a support member, characterized in that: the support member includes a horizontally hollow tube in which an elastic mechanism is disposed, the back member includes two pressed pieces fixed on two sides thereof respectively, lower ends of the two pressed pieces connect with two ends of the elastic mechanism individually, and the cushion is secured on the support member.   
     
     
         2 . The chair with a resilient back as claimed in  claim 1 , characterized in that the elastic mechanism is a torsion spring, a middle section of the elastic mechanism is fixed, and two outer ends of the torsion spring are coupled with the lower end of the pressed piece. 
     
     
         3 . The chair with a resilient back as claimed in  claim 1 , characterized in that the elastic mechanism includes a positioning member, a resilient rotating shaft, two rotary blocks, two limiting members, and two locking members, the positioning member is fixed in the horizontally hollow tube of the support member and includes a first non-circular hole, the resilient rotating shaft is a non-circular bar and is inserted through the positioning member, each rotary block includes a second non-circular hole, and the two rotary blocks are fitted onto two ends of the resilient rotating shaft respectively, each limiting member includes a bore, a diameter of which is larger than that of the rotary block, so that the bore is fitted onto the rotary block, the two limiting members are covered on two ends of the horizontally hollow tube individually, each pressed piece includes an aperture, a shape of which is identical to that of the rotary block, the rotary block is inserted into the aperture, the lower ends of the two pressed pieces are connected together via the two locking members and the resilient rotating shaft. 
     
     
         4 . The chair with a resilient back as claimed in  claim 3 , characterized in that the pressed piece includes a third non-circular hole formed on the lower end thereof, the resilient rotating shaft is inserted through the lower end of the pressed piece and includes a slot arranged on a distal end thereof to retain the locking member. 
     
     
         5 . The chair with a resilient back as claimed in  claim 4 , characterized in that the first non-circular hole of the positioning member is hexagonal, the resilient rotating shaft is formed in a hexagonal column and made of a steel, the second non-circular hole of the rotary block is hexagonal, and the third non-circular hole of the pressed piece is hexagonal. 
     
     
         6 . The chair with a resilient back as claimed in  claim 3 , characterized in that a cross section of the rotary block is formed in a drum shape. 
     
     
         7 . The chair with a resilient back as claimed in  claim 3 , characterized in that a rotating angle of the rotary block in the bore is 5-15 degrees, and a backward pressed angle of the back member is 5-15 degrees. 
     
     
         8 . The chair with a resilient back as claimed in  claim 3 , characterized in that the limiting members are connected with the horizontally hollow tube by selecting from a screw connecting, a bolt connecting, a rivet connecting, and a welding manner. 
     
     
         9 . The chair with a resilient back as claimed in  claim 1 , characterized in that the cushion is slidably placed on the support member, and the support member includes two projections, and each projection includes a washer, the washer includes two rollers disposed on a lower side thereof, and the two rollers are covered by two covers individually and pressed on two washers respectively, two sides of the cushion are coupled with the two pressed pieces. 
     
     
         10 . The chair with a resilient back as claimed in  claim 1 , characterized in that the pressed pieces and two armrests are integrally formed. 
     
     
         11 . The chair with a resilient back as claimed in  claim 2 , characterized in that the pressed pieces and two armrests are integrally formed. 
     
     
         12 . The chair with a resilient back as claimed in  claim 3 , characterized in that the pressed pieces and two armrests are integrally formed. 
     
     
         13 . The chair with a resilient back as claimed in  claim 4 , characterized in that the pressed pieces and two armrests are integrally formed. 
     
     
         14 . The chair with a resilient back as claimed in  claim 5 , characterized in that the pressed pieces and two armrests are integrally formed. 
     
     
         15 . The chair with a resilient back as claimed in  claim 6 , characterized in that the pressed pieces and two armrests are integrally formed. 
     
     
         16 . The chair with a resilient back as claimed in  claim 7 , characterized in that the pressed pieces and two armrests are integrally formed. 
     
     
         17 . The chair with a resilient back as claimed in  claim 8 , characterized in that the pressed pieces and two armrests are integrally formed. 
     
     
         18 . The chair with a resilient back as claimed in  claim 9 , characterized in that the pressed pieces and two armrests are integrally formed.