Adjustable waistrest structure of a chair

Abstract

A waistrest structure is intended to be incorporated into a chair. The structure includes a waistrest pad and an adjustment device enabling the waistrest pad to be moved away from or toward a waist area of the backrest of the chair. The adjustment device has two pivoting seats, which are fastened at an interval to the waist area of the backrest of the chair and are provided with a pivoting arm, a toothed wheel, a hinged tongue, and a recovery piece. The waistrest pad is mounted on the pivoting arm of the pivoting seats. The pivoting arm is located in a step-by-step manner by the hinged tongue whose tip engages the notches of the toothed wheel.

1 . A waistrest structure to be incorporated into a chair, said waistrest structure comprising: 
 a waistrest pad comprised of a support plate; and    an adjustment device comprising two pivoting seats fastened at an interval to a fastening plate located in a waist portion of a backrest of the chair, said two pivoting seats being provided with a pivoting arm whereby said pivoting arm is fastened to said support plate.    
   
   
       2 . The waistrest structure as defined in  claim 1 , wherein said two pivoting seats are comprised of a toothed wheel, a hinged tongue, and a recovery piece whereby said hinged tongue has a tip which engages notches of said toothed wheel so as to locate said pivoting arm of said pivoting seats.  
   
   
       3 . The waistrest structure as defined in  claim 1 , wherein said waistrest pad is comprised of a waist-soothing edge.