| 摘要 |
A chair seat mounting mechanism includes a stationary base member (1) adapted to be mounted on a chair base, a seat-mounting member (9) that is adapted to be attached to a chair seat and is rotatably attached to the base member (1) by a pivot shaft (7) and springs acting between the base member (1) and the seat-mounting member (9) and biasing the seat to a neutral position intermediate of a forward tilted position and a rearward tilted position. An intermediate member (12) is pivotally attached to the pivot shaft (7), and at least one first spring (13) is engaged between the intermediate member (12) and the seat-mounting member (9) such as to bias the seat-mounting member relative to the intermediate member toward the neutral position and to permit the seat to tilt forward against the bias. At least one second spring (17) is engaged between the base member (1) and the intermediate member (12) such as to bias the intermediate member relative to the base member toward the neutral position and to permit the seat to tilt rearward against the bias. The pivot shaft (7) is spaced apart a substantial distance from the center of the chair seat in the direction of the front edge of the seat botton (10) so as to limit the amount of vertical motion of the front edge when the seat tilts forward and backward from the neutral position. <IMAGE> |
