Internal support for a backrest for a chair

Abstract

An improved reinforcement backrest for a chair which includes a reinforcement member such as a metal plate inserted into the backrest to provide reinforcement support when a person sitting in the chair leans against the backrest. The reinforcement member includes connection members by which the backrest is removably inserted and retained in the rear section of the chair. The reinforcement member is preferably metal such as steel to withstand the force of a heavy person leaning against the backrest, but other materials such as strong carbon fiber will also provide adequate reinforcement support.

What is claimed is: 
     
         1 . A backrest for a chair which includes feet which enable the chair to be positioned on a horizontal surface, and a seat, the chair further comprising:
 a. a rear frame section including a first side frame section which extends at its bottom end to the horizontal surface, a second side frame section which extends at its bottom to the horizontal surface, a lower horizontal frame section supported by and between the first side frame section and the second side frame section, the first side frame section having a top end and the second side frame section having a top end, which top ends support an upper horizontal frame section which is parallel to and spaced apart from the lower horizontal frame section, the first side frame section, second side frame section, lower horizontal frame section and upper horizontal frame section surround an opening into which a reinforced backrest is placed;   b. the reinforced backrest includes a steel frame member having a bottom horizontal wall with two lower spaced apart prongs extending transversely from the bottom horizontal wall, an upper horizontal wall with upper two spaced apart prongs extending transversely from the upper horizontal wall, and a multiplicity of spaced apart parallel transverse members which extend from and are respectively connected to the bottom horizontal wall and the upper horizontal wall;   c. the steel frame member is embedded in the backrest so the steel frame member is covered with interior cushioning material and an exterior backrest material with the two lower spaced apart prongs extending out of a bottom of the backrest and the two upper spaced apart prongs extending out of a top of the backrest; and   d. the backrest inserted into the opening surrounded by rear section members of the rear frame, the two upper prongs respectively received in mating female receiving openings in an interior surface of the upper horizontal frame section and the two lower prongs respectively received in mating female receiving openings in an interior surface of the lower horizontal frame section.   
     
     
         2 . The backrest in accordance with  claim 1 , further comprising: the backrest is removable from the chair. 
     
     
         3 . The backrest in accordance with  claim 1 , further comprising: the cushioning material is foam. 
     
     
         4 . The backrest in accordance with  claim 1 , further comprising: the exterior covering material is made of material selected from the group consisting of cotton, wool, leather, suede and vinyl. 
     
     
         5 . A backrest for a chair comprising:
 a. a frame section including a first side frame section, a second side frame section, a lower horizontal frame section, and an upper horizontal frame section which are affixed together to surround an interior opening into which a reinforced backrest is placed;   b. the reinforced backrest includes a reinforcement frame member having a bottom horizontal wall with two lower spaced apart prongs extending transversely from the bottom horizontal wall, an upper horizontal wall with upper two spaced apart prongs extending transversely from the upper horizontal wall, and a multiplicity of spaced apart parallel transverse members which extend from and are respectively connected to the bottom horizontal wall and the upper horizontal wall;   c. the reinforcement frame member is embedded in the backrest so that the reinforcement frame member is covered with interior cushioning material and an exterior backrest material with the two lower spaced apart prongs extending out of a bottom of the backrest and the two upper spaced apart prongs extending out of a top of the backrest; and   d. the backrest inserted into the opening so that the two upper prongs are respectively received in mating female receiving openings in an interior surface of the upper horizontal frame section and the two lower prongs respectively received in mating female receiving openings in an interior surface of the lower horizontal frame section.   
     
     
         6 . The backrest in accordance with  claim 5 , further comprising: the backrest is removable from the chair. 
     
     
         7 . The backrest in accordance with  claim 5 , further comprising: the cushioning material is foam. 
     
     
         8 . The backrest in accordance with  claim 5 , further comprising: the exterior covering material is made of material selected from the group consisting of cotton, wool, leather, suede and vinyl. 
     
     
         9 . The backrest in accordance with  claim 5 , further comprising: the reinforcement member is made of material selected from the group consisting of steel, titanium and polycarbon. 
     
     
         10 . A backrest for a chair comprising:
 a. a frame section including frame members surrounding an interior opening into which a reinforced backrest is placed;   b. the reinforced backrest includes a reinforcement frame member having a body with attaching members extending out of the body   c. the reinforcement frame member is embedded in the backrest so that the reinforcement frame member is covered with interior cushioning material and an exterior backrest material with the attaching members extending out of the backrest; and   d. the backrest inserted into the interior opening so that the attaching members are respectively received in mating receiving members in the frame so that the backrest is retained within the frame.   
     
     
         11 . The backrest in accordance with  claim 10 , further comprising: the backrest is removable from the chair. 
     
     
         12 . rest in accordance with  claim 10 , further comprising: the cushioning material is foam. 
     
     
         13 . The backrest in accordance with  claim 10 , further comprising: the exterior covering material is made of material selected from the group consisting of cotton, wool, leather, suede and vinyl. 
     
     
         14 . The backrest in accordance with  claim 10 , further comprising: the reinforcement member is made of material selected from the group consisting of steel, titanium and polycarbon.