Chair with pre-stressing structure

Abstract

The present invention provides a chair with a pre-pressing structure. The chair includes a main body and pre-pressing structure. The pre-pressing structure includes a permanent seat, pre-pressing member and pivoted seat. The permanent seat is arranged onto the assembly surface of the backing plate, and the pre-pressing member is assembled therein. The multi-segment directional groove of the pivoted seat is interlocked with the multi-segment directional bulge of the pre-pressing member, so that the circular elastic member of the pre-pressing member can obtain a torsional restoring force, allowing for pre-pressing and locating via the pre-pressing locator. The pivoted seat is fitted with an inserting portion for inserting into the support of the main body.

1 . A chair comprising:
 a main body, being comprised of a backing plate with an assembly surface and supports;   a pre-pressing structure being fitted in said main body, said main body having an elastic restoring force, said pre-pressing structure comprising:
 a permanent seat, arranged onto the assembly surface of the backing plate, said permanent seat being provided with a chamber; 
 a pre-pressing member, assembled into the chamber of said permanent seat, said pre-pressing member containing a limiting seat, a circular elastic member and a multi-segment directional bulge; 
 a pivoted seat, being provided with a multi-segment directional groove that is interlocked with a multi-segment directional bulge, said circular elastic member having a torsional restoring force; and 
 a pre-pressing locator, wherein said pivoted seat is fitted with an inserting portion inserted into a support of said main body. 
   
     
     
         2 . The chair defined in  claim 1 , wherein said pre-pressing locator is arranged onto the locating bulge of the limiting seat and also into an embedding groove of the pivoted seat, said embedding groove having a width bigger than a width of the locating bulge, along with an angle difference, the locating bulge being embedded into the embedding groove forming a tilting space. 
     
     
         3 . The chair defined in  claim 1 , wherein the multi-segment directional bulge and multi-segment directional groove have a crisscrossed or polygonal shape. 
     
     
         4 . The chair defined in  claim 1 , wherein the backing plate is applied to a seat back or a seat cushion.