Patent ID: 7249800

Claim:
A chair comprising: a saddle shaped seat part comprising: a first curved thigh trough comprising: a bottom section; and a first inner side section and a first outer side section each extending along opposing sides of a first length extending between a first front section and a first back section of said first curved thigh trough; a second curved thigh trough comprising: a bottom section; and a second inner side section and a first outer side section each extending along opposing sides of a second length extending between a second front section and a second back section of said second curved thigh trough; a leg part adapted to steadily support the chair on a flat surface, wherein the leg part comprises an upper part; an attaching device in said upper part for attaching the leg part with the first curved thigh trough and with the second curved thigh trough; a first adjusting device coupled to said leg part for adjusting a height of the seat part; and a second adjusting device for adjusting an angle between the first and second lengths, wherein the second adjusting device is adapted to provide a continuous angular range of adjustments between the lengths, wherein a first central ridge longitudinal to the seat part is formed of an edge of said first inner side section rising from said first front section towards said second curved thigh trough and a second central ridge longitudinal to the seat part is formed of an edge of said second inner side section rising from said second front section towards said first curved thigh trough, and wherein each of said first and second lengths extend away from said first back section and said second back section, respectively, downwards, and away from one another, and wherein each of said first curved thigh trough and said second curved thigh trough is separate from the other by a central opening generally parallel with said first central ridge and said second central ridge.