| 摘要 |
The present invention relates to a chair having a seat and back (R) whose inclination can be adjusted and including a foot rest (10) which includes an adjustable height supporting spindle (10a) and a seat support (11) received by the supporting spindle (10a), with a front seat portion (S) being articulated to the seat support by way of a first pivot axis (12), and the seat being adjustable over an angle range which includes the horizontal; the chair further including a pelvis-hip support (B) articulated to the rear of the front seat portion (S) by way of a second pivot axis (17'), with the entrance section (b in Figure 2) of the pelvis-hip support contributing to the formation of the seat surface and extending approximately perpendicularly to its exit section (b' in Figure 2) to which the backrest (R) is articulated by way of a third pivot axis (36); the chair also including an adjustment device for changing the inclination of the seat surface when the chair is moved from a working position to a reclining position, said seat surface, in the reclining position, lying approximately in a plane which is slightly inclined toward the rear (c-c in Figure 3). The front seat portion (S) of the chair has a rocker (14) as its supporting element while the pelvis-hip support (B) has a supporting plate (15) as its supporting element; the adjustment device includes synchronizing levers (25) which, at one end, are articulated at the seat support (11) at such a distance from the pivot axis (12) and, at the other end, are articulated at the support plate (15) at a distance of 15 cm from the pivot axis (17') so that, if the front seat portion (S) is pivoted, an overproportional pivoting of the pelvis-hip support (B) results, with the entrance section (b) of the pivoting movement being longer than its exit section (b') which ends in the hip region of the seat user's spine and the backrest (R) is pivotal toward the rear about its pivot axis (36) by movement of the chair user's body against the force of a spring. |
