Vehicle seat having a seat surface which is adjustable both as to height and inclination

Vehicle seat in which the inclination of the back rest and the inclination and height of the seat surface are adjustable, having:

• (a) an upholstery support for the upholstery forming the seat surface, in which the height and inclination of the upholstery support are adjustable relative to a seat support means that is connected with the vehicle,
• (b) a rear height adjustment device supported by the seat support means and supporting a rear part of the upholstery support, said rear height adjustment device comprising a first angled lever having upper and lower ends which, at an intermediate point, is pivotally connected to and which can be pivoted about a first axle supported on the seat support means and running in the lateral direction of the seat,
• (c) a front height adjustment device supported by the seat support means and supporting a front part of the upholstery support, said front height adjustment device comprising a second angled lever having upper and lower ends which, at an intermediate point, is pivotally connected to and which can be pivoted about a second axle supported on the seat support means and running in the lateral direction of the seat, said front and rear parts of said upholstery support being pivotally supported by said upper ends of said second and first levers, respectively,
• (d) a first drive mechanism coupled to said rear height adjustment device at said first lever lower end by a first spindle and first turning knuckle, and coupled to said front height adjustment device at said second lever lower end by a second spindle and second turning knuckle disposed between said first and second lever lower ends, said first drive mechanism activating said rear and front height adjustment devices together,
• (e) a second drive mechanism coupled to said front height adjustment device at said second lever lower end and coupled to said rear height adjustment device at said first lever lower end by said second spindle and said first turning knuckle, said second drive mechanism activating only said front height adjustment device, and
• (f) a guide provided for the upholstery support, said guide being connected to the seat support means, said guide extending in a direction inclined backwardly with respect to a vertical direction, and means are provided interconnecting said guide and said upholstery support, wherein said guide, in cooperation with said interconnecting means, superimposes a backwards movement of the upholstery support over the vertical adjustment when the upholstery support is moved upward and superimposes a forward movement over the vertical adjustment when the upholstery support is moved downward.