Chair and seat apparatus, and methods of constructing and utilizing same

A chair adapted to support a user's body so as to eliminate undesirable pressure to parts of the user's body including the spine, comprising:

• a frame including means for supporting the chair on a horizontal surface;
• a seat portion supported on said frame;
• said seat portion including first means for independently supporting right and left buttock portions of the user's body;
• said seat portion further including second means, spaced from said first means, for supporting back portions of the user's thighs;
• a back support portion mounted on said frame substantially rearwardly of said seat portion;
• said back support portion including third means for independently supporting two separate portions of a user's back, on either side of the spine, in the posterior pelvic area;
• said back support portion further including fourth means for independently supporting two separate portions of a user's back, on either side of the spine, in the thoracic area;
• and
• said back support portion cooperating with said seat portion so as to control sitting posture.

A portable seat apparatus adapted to support a user's body so as to eliminate undesirable pressure to parts of the user's body including the spine, said seat apparatus being adapted to be disposed on a conventional chair or seat, comprising:

• a support frame adapted to rest on a conventional chair or seat;
• a seat portion mounted to an upper side of said support frame;
• said seat portion including a pair of spaced-apart buttocks support members for independently supporting right and left buttock portions of the user's body, without any body-contacting portion therebetween;
• said seat portion further including an elongated thigh support member adapted to support back portions of each of the user's thighs;
• said elongated thigh support member having the longitudinal axis thereof extending across the width of said seat portion so as to define a front part of said seat portion;
• said spaced-apart buttocks support members being rearwardly spaced from said thigh support member so as to define a separate and independent back part of said seat portion;
• each of said buttocks support members and said thigh support member being separately and independently supported on separate support portions of said frame, without any body-contacting portions therebetween;
• and
• the combined width dimensions of said buttocks support members being substantially less than the width of said front part of said seat portion defined by said thigh support member.