Patent Publication Number: US-2011062763-A1

Title: Adjustable Armrest Support Assembly for Chair

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an armrest support and, more particularly, to an adjustable armrest support assembly for chair. 
     2. Description of the Related Art 
     A conventional armrest support assembly  1  for chair in accordance with the prior art shown in  FIG. 6  comprises an upright support member  11 , an outer tube  10  movably mounted on the support member  11  and two spaced limit plates  12  each secured on the support member  11  and each abutting an inner wall of the outer tube  10 . However, the outer tube  10  is not fitted on the support member  11  closely so that the outer tube  10  is not moved on the support member  11  smoothly and stably, thereby easily incurring vibration during movement of the outer tube  10  relative to the support member  11 . 
     BRIEF SUMMARY OF THE INVENTION 
     In accordance with the present invention, there is provided an armrest support assembly for chair, comprising 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. 
     The primary objective of the present invention is to provide an armrest support assembly that is operated smoothly and stably. 
     According to the primary objective of the present invention, 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. 
     Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S) 
         FIG. 1  is a perspective view of an armrest support assembly for chair in accordance with the preferred embodiment of the present invention. 
         FIG. 2  is an exploded perspective view of the armrest support assembly for chair as shown in  FIG. 1 . 
         FIG. 3  is a cross-sectional view of the armrest support assembly for chair taken along line  3 - 3  as shown in  FIG. 1 . 
         FIG. 4  is a locally enlarged view of the armrest support assembly for chair taken along a circle “A” as shown in  FIG. 3 . 
         FIG. 5  is a schematic operational view of the armrest support assembly for chair as shown in  FIG. 3 . 
         FIG. 6  is an exploded perspective view of a conventional armrest support assembly for chair in accordance with the prior art. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to the drawings and initially to  FIGS. 1-4 , an armrest support assembly for chair in accordance with the preferred embodiment of the present invention comprises an upright support member  3 , an outer tube  2  movably and adjustably mounted on the support member  3 , and two opposite resting members  4  each secured in the outer tube  2  to move in concert with the outer tube  2  and each abutting the support member  3  during movement of the outer tube  2  relative to the support member  3 . 
     The outer tube  2  has an inner wall provided with two opposite locking ribs  21 . Each of the two locking ribs  21  of the outer tube  2  has a substantially convex arcuate cross-sectional profile as shown in  FIG. 4 . 
     The two resting members  4  are located at two opposite sides of the support member  3  to surround and clamp the support member  3  between the two resting members  4 . Each of the two resting members  4  has an elongate inner wall  45  pressing the support member  3  during movement of the outer tube  2  relative to the support member  3 . Each of the two resting members  4  has a lower end provided with a locking groove  42  locked onto a respective one of the two locking ribs  21  of the outer tube  2  to lock each of two resting members  4  in the outer tube  2 . The lower end of each of the two resting members  4  is provided with an outwardly protruding lower pressing plate  41  pressing the inner wall of the outer tube  2 . The locking groove  42  of each of the two resting members  4  is formed in the lower pressing plate  41 . Each of the two resting members  4  has an upper end provided with an outwardly protruding upper pressing plate  43  pressing the inner wall of the outer tube  2 . 
     In operation, referring to  FIGS. 4 and 5  with reference to  FIGS. 1-3 , each of two resting members  4  is locked in the outer tube  2  to move in concert with the outer tube  2 , and the support member  3  is surrounded and clamped between the two resting members  4 , so that when the outer tube  2  is moved relative to the support member  3 , each of two resting members  4  presses the support member  3  closely and tightly to stabilize movement of the outer tube  2  relative to the support member  3 . Thus, the outer tube  2  is moved relative to the support member  3  smoothly and stably without incurring vibration. 
     Accordingly, when the outer tube  2  is moved relative to the support member  3 , the inner wall  45  of each of two resting members  4  presses the support member  3  closely and tightly to stabilize movement of the outer tube  2  relative to the support member  3 , so that the outer tube  2  is moved relative to the support member  3  smoothly and stably without incurring vibration. 
     Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.