Biomechanical body support with tilting leg rest tilting seat and tilting and lowering backrest

A biomechanical body support comprising a substructure, a seat which is supported by said substructure and is tiltable relative to said substructure by a first tilt means, a backrest which is coupled to said seat and is tiltable relative to said seat by a second tilt means, a tilting axis of the second tilt means approximately coinciding with the pivotal point of the hip joint of a person resting on said seat, a leg support also tiltably connected to said seat by a third tilt means, characterized in that the backrest (14) is slideably mounted on a reverse U-shaped tilting frame (6) arranged behind the backrest by a slide means, a fixed leg of said frame, which is directed towards the backrest, being hingedly connected to a first pivot (A) of the seat by a hinge means (15) while a second leg of said frame (12) having length-adjustable means connected to a second pivot (B) of the seat, the backrest (14) being connected to the seat (15) by adjusting mechanism means for sliding the backrest (14) relative to the tilting frame (6) in the direction of the seat (15) upon downward pivoting movement of the tilting frame (6).