| 摘要 |
<p>PURPOSE:To seat always in a suitable attitude regardless of the height of a seat surface by changing the front and rear angle of the seat surface with by means of rocking to make the gravity of a human to seat into a center accompanied with the change of the seat surface height of the chair. CONSTITUTION:A leg 2 is provided at the lower edge of a column 1 of the chair having a height adjustable function, and an arc surface is formed on an upper surface 3a of a seat surface supporting body 3 at the upper edge of the column 1 in seeing from a side surface. From the rear edge of the upper surface 3a, a seat back part 3b is risen. A seat surface 4 mounted slidably forward and backward to the upper surface 3a of the supporting body 3 is divided into a front half side 41 and a rear half side 42. The lower surface of the seat surface is formed to a curvature matched to the curvature of the upper surface of the seat surface supporting body 3. The seat surface 4 of the chair is set by being rocked forward and backward in making the gravity of the person to seat into an approximate center while the front and rear angle of the seat surface 4 accompanies the lift of the seat surface when the height is lifted.</p> |
