Double angle back support adjustment

Abstract

A chair is described herein. The chair includes a first back support coupled to a base of the chair using one or more first support arms. The chair also includes a second back support coupled to the base of the chair using one or more second support arms. The first and second back supports are independently rotatable about a common axis.

1 . A chair comprising:
 a first back support;   first support arms to connect the first back support to a base of the chair;   a second back support; and   a second support arm to connect the second back support to the base of the chair,   wherein the second back support is independently rotatable from the first back support, and each of the first back support and the second back support rotate about a common axis.   
     
     
         2 . The chair of  claim 1 , wherein the first support arms are extendable to adjust a height of the first back support. 
     
     
         3 . The chair of  claim 1 , wherein the second support arm is extendable to adjust a height of the second back support. 
     
     
         4 . The chair of  claim 1 , wherein the first back support is pivotable about a first end of the first support arms. 
     
     
         5 . The chair of  claim 1 , wherein the second back support is pivotable about a first end of the second support arm. 
     
     
         6 . The chair of  claim 1 , further comprising an angle adjustment mechanism to enable adjustment of an angle of at least one of the first support arms or the second support arm. 
     
     
         7 . The chair of  claim 6 , further comprising an additional angle adjustment mechanism to enable adjustment of an angle of the other one of the first support arms or the second support arms. 
     
     
         8 . The chair of  claim 6 , wherein the angle adjustment mechanism includes a pin, the pin having a pin axis and each of the first back support and the second back support rotate about the pin axis. 
     
     
         9 . The chair of  claim 8 , wherein the common axis coincides with the pin axis. 
     
     
         10 . The chair of  claim 6 , wherein the angle adjustment mechanism includes:
 a first pin having a first pin axis; and   a second pin having a second pin axis;   wherein the first back support rotates about the first pin axis and the second back support rotates about the second pin axis.   
     
     
         11 . The chair of  claim 10 , wherein the first pin axis differs from the second pin axis. 
     
     
         12 . A back support adjustment mechanism for a chair, the back support adjustment mechanism comprising:
 a first connection point and a second connection point, each of the first connection point and the second connection point being aligned on an axis;   a first support arm rotatably coupled to the first connection point, the first support arm supporting a first back support;   a second support arm rotatably coupled to the second connection point, the second support arm supporting a second back support;   a first adjustment device coupled to the first support arm; and   a second adjustment device coupled to the second support arm.   
     
     
         13 . The back support adjustment mechanism of  claim 12 , wherein the first adjustment device is operable to adjust an angle of the first back support. 
     
     
         14 . The back support adjustment mechanism of  claim 13 , wherein the first adjustment device includes a knob operating a cam to rotate the first support arm and the first back support. 
     
     
         15 . The back support adjustment mechanism of  claim 13 , wherein the first adjustment device includes a lever to unlock movement of the first support arm to adjust the angle of the first back support. 
     
     
         16 . The back support adjustment mechanism of  claim 13 , wherein the first connection point and the second connection point are positioned on a single pin or rod. 
     
     
         17 . The back support adjustment mechanism of  claim 12 , wherein the first connection point and the second connection point are positioned on separate pins or rods. 
     
     
         18 . The back support adjustment mechanism of  claim 12 , wherein the first back support and the second back support are rotatable around a common axis. 
     
     
         19 . The back support adjustment mechanism of  claim 12 , wherein the second adjustment device is operable to adjust an angle of the second back support. 
     
     
         20 . The back support adjustment mechanism of  claim 19 , wherein the second adjustment device includes a knob operating a cam to rotate the second support arm and second back support.