| 摘要 |
A b s t r a c t The invention relates to a device in a chair, especially an adjustable chair (1aa) having an articulation means (7) between a seat member (3) a back rest member (8a), so as to allow an alteration of the angular position therebetween, the alteration taking place by pivoting said back rest member (8a) around a pivoting point (8) whilst said seat member (3) is displaced along a predetermined sliding path. The invention is characterized in that the device comprises one or more curved sliding means (1), the radius of curvature (R) of said sliding means (1) or the center (4) thereof being arranged in accordance with given functional properties of said chair (1aa), it being observed that a smaller radius of curvature (R) or a corresponding sharper curve of the sliding means (1) involves a larger varyation from a minimum value to maximum value of the tangential angle (.alpha.),i.e. the angle between a horizontal plane (H) and a tangent to the curved sliding means (1), and it also being observed that a displacement of the center (4) of said sliding means (1) involves an overall change of the tangential angle (.alpha.) of the sliding means (1) in all positions thereof, which in turn means that for example an increase of the tangential angle (.alpha.) of the sliding means (1) may compensate for the increased weight from a person on the back rest member (8a) as the latter is taking a more reclined position, for thereby providing a chair which is in balance in all positions and rendering smaller friction than compared with prior art models. Figure 2 |
