Supporting device for a chair

Abstract

A supporting device for a chair in accordance with the present invention comprises a board comprising two opposite lateral wings extending from a side of the board and defining a compartment therebetween, each of the opposite lateral wings having a top edge. Plural resilient members extend between the top edges of the opposite lateral wings. An elastic lining pad is mounted to an outer side of the plural resilient members. When an external force is exerted on the supporting device, the plural resilient members absorbs the external force by means of deforming into the compartment, and the resilient members return to their original shapes when the external force is removed.

What is claimed is:  
     
         1 . A supporting device for a chair, comprising: 
 a board comprising two opposite lateral wings extending from a side of the board and defining a compartment therebetween, each of the opposite lateral wings having a top edge;    plural resilient members extending between the top edges of the opposite lateral wings; and    an elastic lining pad mounted to an outer side of the plural resilient members;    wherein when an external force is exerted on the supporting device, the plural resilient members absorbs the external force by means of deforming into the compartment, and the resilient members return to their original shapes when the external force is removed.    
     
     
         2 . The supporting device for a chair as claimed in  claim 1 , further comprising plural ribs extending between the opposite lateral walls of the board for reinforcing the board.  
     
     
         3 . The supporting device for a chair as claimed in  claim 1 , wherein air is allowed to circulate in the compartment to provide a good permeability.  
     
     
         4 . The supporting device for a chair as claimed in  claim 1 , further comprising an elastic support between the plural resilient members and the elastic lining pad for preventing the elastic lining pad from entering into the compartment.  
     
     
         5 . The supporting device for a chair as claimed in  claim 1 , further comprising an outer cover for housing the board and the elastic lining pad.  
     
     
         6 . The supporting device for a chair as claimed in  claim 1 , wherein the board is formed by molding injection.  
     
     
         7 . The supporting device for a chair as claimed in  claim 1 , wherein each said resilient member is a rubber strip.  
     
     
         8 . The supporting device for a chair as claimed in  claim 1 , wherein each said resilient member is a spring.