Folding chair and mounting structure of vacuum-formed backrest board thereof

Abstract

A mounting structure of a vacuum-formed backrest board of a folding chair is provided. Edges of a left side and a right side of the vacuum-formed backrest board are folded rearward to form a fixed flange, a surface of the fixed flange comprises one or more inverted buckling protruding teeth, the vacuum-formed backrest board is disposed between two leg tubes of the folding chair symmetrically disposed in a left and right direction, the two leg tubes comprises a mounting buckling groove corresponding to the fixed flange, the fixed flange is disposed in the mounting buckling groove, a lower edge of the vacuum-formed backrest board comprises a vacuum-formed bent edge extending rearward, two ends of an edge banding strip are respectively connected to the two leg tubes, and the vacuum-formed bent edge is wrapped by the edge banding strip.

What is claimed is: 
     
         1 . A mounting structure of a vacuum-formed backrest board of a folding chair, wherein:
 edges of a left side and a right side of the vacuum-formed backrest board are folded rearward to form a fixed flange,   a surface of the fixed flange comprises one or more inverted buckling protruding teeth,   the vacuum-formed backrest board is disposed between two leg tubes of the folding chair symmetrically disposed in a left and right direction,   the two leg tubes comprises a mounting buckling groove corresponding to the fixed flange,   the fixed flange is disposed in the mounting buckling groove,   the one or more inverted buckling protruding teeth are buckled to an edge of the mounting buckling groove to inhibit the fixed flange from being separated from the mounting buckling groove,   a lower edge of the vacuum-formed backrest board comprises a vacuum-formed bent edge extending rearward,   two ends of an edge banding strip are respectively connected to the two leg tubes of the folding chair,   the edge banding strip comprises an insertion groove corresponding to the vacuum-formed bent edge at the lower edge of the vacuum-formed backrest board, and   the vacuum-formed bent edge is wrapped by the edge banding strip.   
     
     
         2 . The mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 1 , wherein:
 the two ends of the edge banding strip are locked to the two leg tubes by screws.   
     
     
         3 . The mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 2 , wherein:
 the screws pass through the two leg tubes to be locked to the fixed flange.   
     
     
         4 . The mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 2 , wherein:
 the screws are locked from an inner side of the two leg tubes.   
     
     
         5 . The mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 1 , wherein:
 the edge banding strip is a plastic part.   
     
     
         6 . The mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 1 , wherein:
 an upper edge and the edges of the left side and the right side of the vacuum-formed backrest board are folded rearward to form the fixed flange,   the fixed flange on the vacuum-formed backrest board extends continuously,   the one or more inverted buckling protruding teeth are evenly spaced from each other on the fixed flange,   upper ends of the two leg tubes are connected by a connecting tube,   the connecting tube comprises the mounting buckling groove, and   the fixed flange on the upper edge of the vacuum-formed backrest board is disposed in the mounting buckling groove of the connecting tube.   
     
     
         7 . The mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 6 , wherein:
 the two leg tubes of the folding chair and the connecting tube are formed by bending a metal tube to enable the metal tube to be U-shaped.   
     
     
         8 . The mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 3 , wherein:
 the screws are locked from an inner side of the two leg tubes.   
     
     
         9 . A folding chair, comprising:
 four leg tubes, which comprise the two leg tubes and two additional leg tubes,   a vacuum-formed seat board, and   a supporting mold frame, wherein:
 the four leg tubes support the supporting mold frame, 
 the two leg tubes are symmetrically disposed in the left and right direction on a left side and a right side of the supporting mold frame to be configured as two front legs of the folding chair, 
 the additional two leg tubes are symmetrically disposed in the left and right direction on the left side and the right side of the supporting mold frame to be configured as two rear legs of the folding chair, 
 the vacuum-formed backrest board is disposed between the two front legs, and 
 the vacuum-formed backrest board is mounted between the two front legs using the mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 1 . 
   
     
     
         10 . A folding chair, comprising:
 four leg tubes, which comprise the two leg tubes and two additional leg tubes,   a vacuum-formed seat board, and   a supporting mold frame, wherein:
 the four leg tubes support the supporting mold frame, 
 the two leg tubes are symmetrically disposed in the left and right direction on a left side and a right side of the supporting mold frame to be configured as two front legs of the folding chair, 
 the additional two leg tubes are symmetrically disposed in the left and right direction on the left side and the right side of the supporting mold frame to be configured as two rear legs of the folding chair, 
 the vacuum-formed backrest board is disposed between the two front legs, and 
 the vacuum-formed backrest board is mounted between the two front legs using the mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 2 . 
   
     
     
         11 . A folding chair, comprising:
 four leg tubes, which comprise the two leg tubes and two additional leg tubes,   a vacuum-formed seat board, and   a supporting mold frame, wherein:
 the four leg tubes support the supporting mold frame, 
 the two leg tubes are symmetrically disposed in the left and right direction on a left side and a right side of the supporting mold frame to be configured as two front legs of the folding chair, 
 the additional two leg tubes are symmetrically disposed in the left and right direction on the left side and the right side of the supporting mold frame to be configured as two rear legs of the folding chair, 
 the vacuum-formed backrest board is disposed between the two front legs, and 
 the vacuum-formed backrest board is mounted between the two front legs using the mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 3 . 
   
     
     
         12 . A folding chair, comprising:
 four leg tubes, which comprise the two leg tubes and two additional leg tubes,   a vacuum-formed seat board, and   a supporting mold frame, wherein:
 the four leg tubes support the supporting mold frame, 
 the two leg tubes are symmetrically disposed in the left and right direction on a left side and a right side of the supporting mold frame to be configured as two front legs of the folding chair, 
 the additional two leg tubes are symmetrically disposed in the left and right direction on the left side and the right side of the supporting mold frame to be configured as two rear legs of the folding chair, 
 the vacuum-formed backrest board is disposed between the two front legs, and 
 the vacuum-formed backrest board is mounted between the two front legs using the mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 4 . 
   
     
     
         13 . A folding chair, comprising:
 four leg tubes, which comprise the two leg tubes and two additional leg tubes,   a vacuum-formed seat board, and   a supporting mold frame, wherein:
 the four leg tubes support the supporting mold frame, 
 the two leg tubes are symmetrically disposed in the left and right direction on a left side and a right side of the supporting mold frame to be configured as two front legs of the folding chair, 
 the additional two leg tubes are symmetrically disposed in the left and right direction on the left side and the right side of the supporting mold frame to be configured as two rear legs of the folding chair, 
 the vacuum-formed backrest board is disposed between the two front legs, and 
 the vacuum-formed backrest board is mounted between the two front legs using the mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 5 . 
   
     
     
         14 . A folding chair, comprising:
 four leg tubes, which comprise the two leg tubes and two additional leg tubes,   a vacuum-formed seat board, and   a supporting mold frame, wherein:
 the four leg tubes support the supporting mold frame, 
 the two leg tubes are symmetrically disposed in the left and right direction on a left side and a right side of the supporting mold frame to be configured as two front legs of the folding chair, 
 the additional two leg tubes are symmetrically disposed in the left and right direction on the left side and the right side of the supporting mold frame to be configured as two rear legs of the folding chair, 
 the vacuum-formed backrest board is disposed between the two front legs, and 
 the vacuum-formed backrest board is mounted between the two front legs using the mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 6 . 
   
     
     
         15 . A folding chair, comprising:
 four leg tubes, which comprise the two leg tubes and two additional leg tubes,   a vacuum-formed seat board, and   a supporting mold frame, wherein:
 the four leg tubes support the supporting mold frame, 
 the two leg tubes are symmetrically disposed in the left and right direction on a left side and a right side of the supporting mold frame to be configured as two front legs of the folding chair, 
 the additional two leg tubes are symmetrically disposed in the left and right direction on the left side and the right side of the supporting mold frame to be configured as two rear legs of the folding chair, 
 the vacuum-formed backrest board is disposed between the two front legs, and 
 the vacuum-formed backrest board is mounted between the two front legs using the mounting structure of the vacuum-formed backrest board of the folding chair according to  claim 7 . 
   
     
     
         16 . A folding chair, comprising:
 four leg tubes, which comprise the two leg tubes and two additional leg tubes,   a vacuum-formed seat board, and
 a supporting mold frame, wherein: 
 the four leg tubes support the supporting mold frame, 
 the two leg tubes are symmetrically disposed in the left and right direction on a left side and a right side of the supporting mold frame to be configured as two front legs of the folding chair, 
 the additional two leg tubes are symmetrically disposed in the left and right direction on the left side and the right side of the supporting mold frame to be configured as two rear legs of the folding chair, 
 the vacuum-formed backrest board is disposed between the two front legs, and 
 the vacuum-formed backrest board is mounted between the two front legs using the mounting structure of the vacuum-formed backrest board of the folding chair according to claim  8 .