Chair with foldable back-rest

Abstract

The chair comprises a back-rest, a seat and a device ( 10 ) for connecting the back-rest to the seat. The connection device ( 10 ) comprises an articulated joint ( 16 ) which enables the back-rest to be folded onto the seat.

1 . A chair comprising a back-rest, a seat and a device ( 10 ) for connecting the back-rest to the seat, characterised in that the connection device ( 10 ) comprises an articulated joint ( 16 ) which enables the back-rest to be folded onto the seat.  
     
     
         2 . A chair as claimed in  claim 1 , wherein the connection device ( 10 ) comprises a lower arm ( 12 ) fixable to the seat and an upper arm ( 14 ) to which the back-rest is fixable, the two arms ( 12  and  14 ) being connected together by the articulated joint ( 16 ).  
     
     
         3 . A chair as claimed in  claim 2 , wherein the articulated joint ( 16 ) comprises an upper portion ( 17 ) fixable to the lower part of the upper arm ( 14 ), a lower portion ( 19 ) fixable to the upper part of the lower arm ( 12 ), and a pin ( 26 ) which enables the two portions ( 17  and  19 ) to undergo relative rotation.  
     
     
         4 . A chair as claimed in  claim 3 , wherein the upper portion ( 17 ) of the articulated joint ( 16 ) comprises a front part ( 18 ) and a rear part ( 20 ), said two parts ( 18 ,  20 ) of the upper portion ( 17 ) being fixable to the lower part of the upper arm ( 14 ), said lower part being locked between said two parts ( 18 ,  20 ) of the upper portion ( 17 ) by screws ( 28 ), the lower portion ( 19 ) of the articulated joint ( 16 ) also comprising a front part ( 22 ) and a rear part ( 24 ), these two parts ( 22 ,  24 ) of the lower portion ( 19 ) being fixable to the upper part of the lower arm ( 12 ), which is interposed between them ( 22 ,  24 ), said upper part being locked between said two parts ( 22 ,  24 ) of the lower portion ( 19 ) by screws ( 28 ).  
     
     
         5 . A chair as claimed in  claim 4 , wherein the lower edge of the upper arm ( 14 ) is flat and is insertable into a relative longitudinal slot ( 30 ) provided in the pin ( 26 ).  
     
     
         6 . A chair as claimed in  claim 1 , wherein the articulated joint ( 16 ) comprises a limit stop ( 34 ,  36 ) defining the position assumed by the back-rest when the chair is utilized.  
     
     
         7 . A chair as claimed in  claim 1 , wherein the articulated joint ( 16 ) comprises a limit stop ( 32 ,  38 ) defining the folded position of the chair back-rest.  
     
     
         8 . A chair as claimed in claims  4  and  5 , wherein the limit stop for the utilization position comprises a step ( 34 ) provided in the front part ( 22 ) of the lower portion ( 19 ) of the articulated joint ( 16 ) to interfere, when the chair is in its utilization condition, with another step ( 36 ) provided in the front part ( 18 ) of the upper portion ( 17 ) of the articulated joint ( 16 ).  
     
     
         9 . A chair as claimed in claims  4  and  6 , wherein the limit stop for the folded position of the back-rest comprises a radial peg ( 32 ) provided in the vicinity of each of the two ends of the pin ( 26 ), the two pegs ( 32 ) interfering, when the back-rest is in its folded position, with a step ( 38 ) provided in the rear part ( 24 ) of the lower portion ( 19 ) of the articulated joint ( 16 ).