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A chair has a spring rocker which is articulatad to a seat support at a front edge of the seat. The rocker is connected to a pelvis-hip support by a horizontal pivot device. An entrance section of the pelvis-hip support is longer than an exit section thereof. Synchronizing levers connect the seat su

A chair has a spring rocker which is articulatad to a seat support at a front edge of the seat. The rocker is connected to a pelvis-hip support by a horizontal pivot device. An entrance section of the pelvis-hip support is longer than an exit section thereof. Synchronizing levers connect the seat support and the pelvis-hip support in such a way that pivoting of the seat results in a relatively greater pivoting of the pelvis-hip support. A backrest is pivotably connected to the exit section of the pelvis-hip support toward the rear against the force of a spring by movement of the body of a seated person. This permits the shell elements of the shell contour of the chair to conform better to the course of movement executed by the body, of the seated person, and to give support throughout the pelvis-hip region of the body of the seated person.

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A chair, comprising: a rocker; a front seat portion supported by said rocker; a backrest having an adjustable inclination; a foot rest having a supporting spindle which is adjustable in height; a seat support connected to said supporting spindle, said seat support being pivotably connected by first

A chair, comprising: a rocker; a front seat portion supported by said rocker; a backrest having an adjustable inclination; a foot rest having a supporting spindle which is adjustable in height; a seat support connected to said supporting spindle, said seat support being pivotably connected by first pivot means to a front portion of said rocker, such that said rocker is pivotable relative to said seat support over an angle range which includes a horizontal angle; a pelvis-hip support including a pelvis-hip support plate, said pelvis-hip support plate being pivotably connected by second pivot means to a rear portion of said rocker, said pelvis-hip support having an entrance section and an exit section which extends generally perpendicularly to said entrance section, said entrance section being longer than said exit section, said exit section being adapted to support a hip region of a seated person; third pivot means pivotably connecting said exit section to said backrest; adjustment means for changing the inclination of said front seat portion and said pelvis-hip support between a working position and a reclining position; said entrance section and said front seat portion together forming a seat surface which, when said backrest is in said reclining position, is disposed approximately in a plane which is slightly downwardly inclined in a direction which extends from said front seat portion toward said pelvis-hip support; said adjustment means including a plurality of synchronizing levers; each of said synchronizing levers being pivotably connected at one end thereof to said pelvis-hip support plate by synchronizing lever pivot means, and each of said synchronizing levers being pivotably connected at the other end thereof to said seat support by transverse lever pivot means; and said synchronizing lever pivot means being disposed at a first distance from said first pivot means, and said transverse lever pivot means being disposed at a second distance from said second pivot means, said first and second distances being related such that when said front seat portion is pivoted, said pelvis-hip support is proportionately pivoted through a greater angle than said front seat portion; further comprising: a plurality of slots disposed in said seat support; and a linkage means for horizontally moving said rocker, said front seat portion, said support plate having said pelvis-hip support, and said backrest as a structural unit as a function of the swinging motion of said pelvis-hip support along a distance having a length which corresponds to the length of said plurality of slots; said rocker having shaft pins displaceably supported in respective ones of said plurality of slots.