Patent ID: 8662586

Claim:
A seat assembly comprising: (a) a seat; (b) a backrest; and (c) a mounting assembly being formed to support said seat and said backrest for independent movement during use above a mounting frame housing support surface with the mounting assembly being further formed to: (i) mount said seat in a near horizontal orientation for balanced movement along an upwardly concaved arcuate seat path having a center of curvature for and proximate at the center of mass of a person seated on said seat above the seat and forward of the backrest, and (ii) mount said backrest in a near vertical orientation, for movement independently of said seat along a forwardly concaved arcuate backrest path having a center of curvature for-and proximate at the center of mass of a person seated on said seat above the seat and forward of the backrest, and (iii) mount a biasing assembly to said housing support biasing the back support assembly with the backrest balanced to support an unlocked balanced position located at an angular backrest orientation substantially unrestrained between the range of a near vertical orientation and a substantially reclined backrest position with a person supported at said balanced position, and (iv) mount said mounting assembly for each of said backrest and said seat below a surface of the seat with a curved sliding assembly upwardly concaved rotatably mounted to said frame housing support, said frame housing is further secured on the top end of a seat pedestal.