Chair assembly

Abstract

A chair assembly includes a seat support unit disposed on a base, and an annular seat frame mounted on the support unit. The support unit has a middle portion mounted on the base, a front portion extending forwardly and downwardly from the middle portion, and a rear portion which extends rearwardly and upwardly from the middle portion and which has a height higher than the front portion. The seat frame has a rear frame portion mounted detachably on the rear portion of the support unit, and a front frame portion mounted detachably on the front portion of the support unit such that the seat frame is disposed to extend along an inclined plane that inclines forwardly and downwardly.

I claim:  
     
         1 . A chair assembly comprising: 
 a base adapted to be disposed on a ground surface;    a seat support unit disposed on said base, said seat support unit having a front portion, a rear portion opposite to said front portion, and a middle portion interconnecting said front and rear portions, said front portion extending forwardly and upwardly from said middle portion, said rear portion extending rearwardly and upwardly from said middle portion and having a height higher than said front portion with respect to said middle portion, said middle portion being mounted on said base; and    an annular seat frame mounted on said seat support unit, said seat frame having a rear frame portion mounted detachably on said rear portion of said seat support unit, and a front frame portion connected to said rear frame portion and mounted detachably on said front portion of said seat support unit such that said seat frame is disposed to extend along an inclined plane that inclines forwardly and downwardly, said seat frame and said seat support unit cooperatively confining a cushion space.    
     
     
         2 . The chair assembly as claimed in  claim 1 , wherein said base is formed with an upright mounting tube which has an open upper end, said seat support unit including an insert post formed at said middle portion, said insert post extending downwardly and being inserted rotatably into said mounting tube through said open upper end of said mounting tube so as to be rotatable about an axis of said mounting tube.  
     
     
         3 . The chair assembly as claimed in  claim 2 , wherein said seat support unit includes a curved support rod which has a front rod section disposed at said front portion and having a front end that is mounted on said front frame portion of said seat frame, a rear rod section disposed at said rear portion and having a rear end that is mounted on said rear frame portion of said seat frame, and an intermediate rod section which is disposed at said middle portion and which interconnects said front and rear rod sections, said insert post being disposed below said intermediate rod section of said support rod.  
     
     
         4 . The chair assembly as claimed in  claim 3 , wherein said seat support unit further includes a horizontal mounting plate disposed under and secured to said intermediate rod section of said support rod, said insert post being fixed to and extending downwardly from said mounting plate.  
     
     
         5 . The chair assembly as claimed in  claim 3 , wherein said front end of said front rod section is formed with a transverse front holding plate which holds said front frame portion of said seat frame and which is mounted on said front frame portion of said seat frame, said rear end of said rear rod section being formed with a rear holding plate which holds said rear frame portion and which is mounted on said rear frame portion of said seat frame.  
     
     
         6 . The chair assembly as claimed in  claim 2 , wherein said seat support unit includes a pair of spaced-apart curved support rods, each of which has a front rod section disposed at said front portion, a rear rod section disposed at said rear portion, and an intermediate rod section interconnecting said front and rear rod sections, said seat support unit further including a resilient connecting unit for connecting said intermediate rod sections of said support rods to said insert post such that said seat support unit can spring downwardly and upwardly relative to said base.  
     
     
         7 . The chair assembly as claimed in  claim 6 , wherein said front end of said front rod section of each of said support rods is formed with a transverse front holding plate which holds said front frame portion of said seat frame and which is mounted on said front frame portion of said seat frame, said rear end of said rear rod section of each of said support rods being formed with a rear holding plate which holds said rear frame portion and which is mounted on said rear frame portion of said seat frame.  
     
     
         8 . The chair assembly as claimed in  claim 6 , wherein said insert post has an upper end connected to said resilient connecting unit, said resilient connecting unit including 
 a pair of horizontal extending plates secured to said intermediate rod sections of said support rods and extending toward each other,    a parallel pair of horizontal lateral connecting plates transverse to and disposed under said extending plates, respectively, said lateral connecting plates having rear ends secured respectively to said extending plates, and front ends opposite to said rear ends,    a horizontal front connecting plate transverse to and disposed under said lateral connecting plates, said front connecting plate having two opposite ends secured respectively to said front ends of said lateral connecting plates and an intermediate part between said opposite ends, and    a middle connecting plate disposed under said front connecting plate and between said lateral connecting plates, said middle connecting plate having a front end secured to said intermediate part of said front connecting plate and a rear end which is opposite to said front end of said middle connecting plate and which is secured to said upper end of said insert post.    
     
     
         9 . The chair assembly as claimed in  claim 8 , wherein said resilient connecting unit further includes a rear connecting plate parallel to said front connecting plate, said rear connecting plate having two opposite ends disposed on and secured to said extending plates for interconnecting said extending plates.  
     
     
         10 . The chair assembly as claimed in  claim 1 , wherein said front frame portion of said seat frame is narrower than said rear frame portion.  
     
     
         11 . The chair assembly as claimed in  claim 1 , further comprising a chair cushion disposed in said cushion space, said chair cushion spanning said front and rear frame portions of said seat frame and having a peripheral portion mounted on said front and rear frame portions of said seat frame.