Adjustable Armrest Support Assembly for Chair

Abstract

An armrest support assembly for chair includes an upright support member, an outer tube movably and adjustably mounted on the support member and two opposite resting members each secured in the outer tube to move in concert with the outer tube and each abutting the support member during movement of the outer tube relative to the support member. Thus, when the outer tube is moved relative to the support member, the inner wall of each of two resting members presses the support member closely and tightly to stabilize movement of the outer tube relative to the support member, so that the outer tube is moved relative to the support member smoothly and stably without incurring vibration.

1 . An armrest support assembly for chair, comprising:
 an upright support member;   an outer tube movably and adjustably mounted on the support member;   two opposite resting members each secured in the outer tube to move in concert with the outer tube and each abutting the support member during movement of the outer tube relative to the support member.   
     
     
         2 . The armrest support assembly for chair of  claim 1 , wherein
 the outer tube  2  has an inner wall provided with two opposite locking ribs;   each of the two resting members  4  has a lower end provided with a locking groove locked onto a respective one of the two locking ribs of the outer tube to lock each of two resting members in the outer tube.   
     
     
         3 . The armrest support assembly for chair of  claim 2 , wherein the lower end of each of the two resting members is provided with an outwardly protruding lower pressing plate pressing the inner wall of the outer tube. 
     
     
         4 . The armrest support assembly for chair of  claim 3 , wherein the locking groove of each of the two resting members is formed in the lower pressing plate. 
     
     
         5 . The armrest support assembly for chair of  claim 1 , wherein each of the two locking ribs of the outer tube has a substantially convex arcuate cross-sectional profile. 
     
     
         6 . The armrest support assembly for chair of  claim 1 , wherein the two resting members are located at two opposite sides of the support member to surround and clamp the support member between the two resting members. 
     
     
         7 . The armrest support assembly for chair of  claim 1 , wherein each of the two resting members has an elongate inner wall pressing the support member during movement of the outer tube relative to the support member. 
     
     
         8 . The armrest support assembly for chair of  claim 1 , wherein each of the two resting members has an upper end provided with an outwardly protruding upper pressing plate pressing the inner wall of the outer tube.