Patent ID: 7481494

Claim:
An adjustable chair ( 1 ) arrangement, comprising: a seat frame ( 9 ); a seat ( 2 ) attached to the seat frame; a back ( 3 ); two side members ( 4 , 5 ); two rear wheels ( 6 ); two front support-guide wheels ( 7 ); a footrest ( 8 ); a pair of seat swivel fittings ( 11 ) fastened to the seat frame ( 9 ); a pair of back swivel fittings ( 10 ) fastened to the back ( 3 ); a pair of first link arm connections ( 13 ); a pair of second link arm connections ( 14 ); a link arm ( 12 ) connecting each of the back swivel fittings and each of the seat swivel fittings via a respective one of the first link arm connections to the back and via a respective one of the second link arm connections to the seat; a seat pivot support ( 16 ) for each seat swivel fitting; a back pivot support ( 15 ) for each back swivel fitting, one of the seat swivel fittings and one of the back swivel fittings fastened to a respective one of the side members by the back pivot support ( 15 ) of the one back swivel fitting and the seat pivot support ( 16 ) of the one seat swivel fitting; a kinematic connection kinematically interconnecting the two side members to provide that an angle between the seat and the back will increase when the back is swivelled backwards about the respective back pivot support of the side members, wherein, the kinematic connection comprises a link connection between the seat and the back, the link connection is comprised of the link arm ( 12 ) arranged under the respective back and seat pivot supports ( 15 , 16 ) and provide that a distance between the back pivot support ( 15 ) and the back link arm connection ( 13 ) is less than a distance between the seat pivot support ( 16 ) and the seat link arm connection ( 14 ).