Adjustable Chair

Abstract

The adjustable chair includes a support assembly, a support arm, a sleeve seat, a telescopic post and a backrest support. The support has a tube and a plurality of positioning holes longitudinally arranged in a row. The support arm connects between the tube and a cushion and has a positioning bolt selectively inserted into one of the positioning holes. The sleeve seat is bendingly connected to the tube and has an adjusting bolt. The telescopic post is slidably accommodated in the sleeve seat and provided with adjusting holes longitudinally arranged in a row for being selectively inserted by the adjusting bolt. The backrest support is connected to the telescopic post for connecting a backrest.

1 . An adjustable chair comprising:
 a support assembly, having a tube and a plurality of positioning holes longitudinally arranged in a row;   a support arm, connecting between the tube and a cushion, having a positioning bolt selectively inserted into one of the positioning holes;   a sleeve seat, bendingly connected to the tube, having a sleeve and an adjusting bolt penetrating the sleeve;   a telescopic post, slidably accommodated in the sleeve seat, being provided with a plurality of adjusting holes longitudinally arranged in a row for being selectively inserted by the adjusting bolt; and   a backrest support, connected to the telescopic post for connecting a backrest.   
     
     
         2 . The adjustable chair of  claim 1 , wherein one end of the support assembly is sandwiched between two plates. 
     
     
         3 . The adjustable chair of  claim 1 , wherein the support assembly is provided with a fixing hole penetrated by a fastener, the sleeve seat is bendingly connected with a connecting rods with an insert tongue, the insert tongue is formed with a threaded hole, the insert tongue is inserted into the tube, and the sleeve seat is bendingly fastened to the support assembly by inserting the fastener into the threaded hole. 
     
     
         4 . The adjustable chair of  claim 1 , wherein the support arm is formed with a tube holder for fastening onto the tube, and the positioning bolt is located at the tube holder. 
     
     
         5 . The adjustable chair of  claim 1 , wherein an inner sleeve is accommodated in the sleeve, an end of the inner sleeve is formed with a flange for firmly hanging on the sleeve, an inside of the inner sleeve is formed with two longitudinally opposite rails and a through hole penetrating one of the rails, and the through hole is inserted by the adjusting bolt. 
     
     
         6 . The adjustable chair of  claim 5 , wherein the telescopic post is formed with two longitudinally opposite troughs for being separately embedded by the rails, the adjusting holes are located in one of the troughs. 
     
     
         7 . The adjustable chair of  claim 5 , wherein one end of the telescopic post is provided with a stopper ring encompassing the troughs. 
     
     
         8 . The adjustable chair of  claim 6 , wherein one end of the telescopic post is provided with a stopper ring encompassing the troughs. 
     
     
         9 . The adjustable chair of  claim 1 , wherein the backrest support has two opposite ends, the two ends are provided with a first connecting portion for fastening to the telescopic post and a second connecting portion for linking the backrest respectively. 
     
     
         10 . The adjustable chair of  claim 9 , wherein the backrest support is formed with a curved portion between the first and second connecting portions. 
     
     
         11 . The adjustable chair of  claim 9 , wherein the first connecting portion of the backrest support is provided with a handle ring. 
     
     
         12 . The adjustable chair of  claim 9 , wherein the second connecting portion is a pivot for angular adjustment of the backrest. 
     
     
         13 . The adjustable chair of  claim 1 , wherein the support assembly has two parallel tubes, and the sleeve seat is between the two tubes.