be rigidly attached to rear portion 26 of seat 12 such that upward and downward movement of shaft 38 b may cause corresponding upward and downward movement of rear portion 26 the vertical position of front portion 30 of seat 12 may remain unchanged during the upward downward movements of rear portion 26 lastly mechanism 16 c includes a gear box 32 c driving a lead screw 34 c that is capable of turning a nut 36 c that is threadedly coupled to an adjustable shaft 38 c ferrule 48 c connects motor 40 c to gear box 32 c and houses a flex cable not shown which transmits driving force from the armature of motor 40 c to gear box 32 c which in turn then drives lead screw 34 c as lead screw 34 c rotates nut 36 c rotates in one direction or the other about shaft 38 c to thereby cause shaft 38 c to move in one of the upward and downward directions 28 nut 36 c may have a position that is fixed relative to directions 28 shaft 38 c may be rigidly attached to front portion 30 of seat 12 such that upward and downward movement of shaft 38 c may cause corresponding upward and downward movement of front portion 30 the vertical position of rear portion 26 of seat 12 may remain unchanged during the upward downward movements of front portion 30 adjustment of mechanisms 16 b and 16 c facilitate pivoting of seat 12 about pivot 22 in the directions indicated by double arrow 20 motor assembly 18 includes motors 40 a c and optionally electronic rotational measurement devices 42 a c all.