초록 ▼

At a seat carrier 4 of a chair, a backrest 5 is pivotally connected. A seat which rests on the seat carrier 4 and the backrest can be interdependently adjusted in their inclination. For return into the resting position and to fix in any desired position, a gas pressure spring 10 and, if necessary, a

At a seat carrier 4 of a chair, a backrest 5 is pivotally connected. A seat which rests on the seat carrier 4 and the backrest can be interdependently adjusted in their inclination. For return into the resting position and to fix in any desired position, a gas pressure spring 10 and, if necessary, additional springs 11 are provided. The one end of the gas pressure spring 10 engages at the free end of a thrust lever 15 which is pivotally held at the backrest 5, wherein this pivot axis 7 is arranged at a distance from the pivot axis 6 between the backrest 5 and the seat carrier 4. A lever arm 16 which is pivotally attached at the seat carrier 4 also engages at this thrust lever 15 at a distance from its pivot axis 7. The thrust lever 15 can perform a relative motion with respect to the backrest 5 by means of the arrangement of the lever arm 16. Therefore a relatively small movement of the backrest 5 results in a correspondingly larger movement of the gas pressure spring 10.

대표청구항 ▼

Work chair including a seat and a backrest and comprising a seat carrier (4) arranged to support the seat of the chair and a backrest support (5) arranged to support the backrest of the chair, said seat carrier and said backrest support being pivotally connected at a first horizontal axis (6), at le

Work chair including a seat and a backrest and comprising a seat carrier (4) arranged to support the seat of the chair and a backrest support (5) arranged to support the backrest of the chair, said seat carrier and said backrest support being pivotally connected at a first horizontal axis (6), at least one bearing surface (8) for the seat pivotally connected to said backrest support (5) about a second horizontal axis (7), a pedestal (1) secured to and depending downwardly from said seat carrier (4), a gas pressure spring (10) and a screw compression spring (11) are connected between said seat carrier and said backrest support for adjusting the seat and the backrest, a thrust lever (15) pivotally connected to said backrest support, each of said gas pressure spring (10) and screw compression spring (11) has a first end and a second end with the first end of each of said springs pivotally connected to said seat carrier and with the second of each said spring pivotally connected to said thrust lever (15), wherein the improvement comprises that said thrust lever (15) is connected at one end at the second horizontal axis to said backrest and at the other end to the second ends of said springs, said second horizontal axis is parallel to and spaced from said first horizontal axis, and an elongated lever arm (16) having a pair of ends spaced apart in the elongated direction, said lever arm is pivotally secured to said seat carrier adjacent one end thereof and is pivotally connected to said thrust lever adjacent the other end thereof and the location of the pivotal connection of said lever arm (16) and said thrust lever (15) is spaced from the pivotal connection of said thrust lever to said backrest support (5).