Chair backrest mounting device

Abstract

A chair backrest mounting device includes a main body, a middle fixing seat, and two side fixing seats. The main body is made of a flexible material. The middle and side fixing seats are made of a rigid material and embedded in a middle portion and two opposite end portions of the main body, respectively, so that the chair backrest mounting device can maintain sufficient flexibility and deformability to bear forces applied thereto in different angular directions, and sufficient rigidity to avoid easy elastic fatigue and breaking of the main body. Moreover, joint faces between the flexible main body and each of the rigid middle fixing seat and side fixing seats are non-flat faces to provide increased contact area and enhanced joining strength.

1 . A chair backrest mounting device, comprising:
 a main body being made of a flexible material;   a middle fixing seat being made of a rigid material and embedded in a middle portion of the main body, and the middle fixing seat being internally provided a central through hole to serve as a middle mounting hole; and   two side fixing seats being made of a rigid material and separately embedded in two opposite end portions of the main body, and each of the two side fixing seats being internally provided a central through hole to serve as a side mounting hole;   wherein joint faces between the main body and each of the middle fixing seat and the side fixing seats are non-flat faces, which provide increased contact area and accordingly enhanced joining strength between the main body and the fixing seats.   
     
     
         2 . The chair backrest mounting device as claimed in  claim 1 , wherein the middle and the side mounting holes are internally threaded. 
     
     
         3 . The chair backrest mounting device as claimed in  claim 1 , wherein the side fixing seats each are further provided at a front face with a plurality of spaced pointed teeth. 
     
     
         4 . The chair backrest mounting device as claimed in  claim 1 , wherein the non-flat joint faces between the main body and each of the middle and the side fixing seats are wave-shaped faces. 
     
     
         5 . The chair backrest mounting device as claimed in  claim 1 , wherein the non-flat joint faces between the main body and each of the middle and the side fixing seats are serrated faces. 
     
     
         6 . The chair backrest mounting device as claimed in  claim 1 , wherein the non-flat joint faces between the main body and each of the middle and the side fixing seats are fluted faces.