| 摘要 |
A weight adjustment device for a seat suspension to be provided in a seat for a vehicle such as an automobile is disclosed in which an upper frame and a lower frame are connected to each other by means of links, a rotary shaft is journalled between the two side portions of the lower frame and is provided at the two ends thereof with pinion gears integrally therewith, the pinion gears are intermeshed with sector gears freely rotatable in a vertical direction, and there are tension springs respectively extending between the respective first ends of the pinions gears and arms rotatable integrally with the links, whereby the sector gears are rotated by means of operation of an operation lever fixed to the rotary shaft to change the tensile forces of the tension springs so as to be able to adjust the height of the upper frame relative to the lower frame.
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