| 摘要 |
A tilting mechamism for supporting a seat portion and a backrest of chair in integral fashion. This mechanism comprising an upright support; a pedestal block mounted on an upper end of the upright support for swivel movement; an arm member pivotally engaged at the rear side thereof by a first horizontal shaft mounted on the pedestal block toward the front of the upright support; a seat plate pivotally engaged at a front portion thereof with the end of this arm member by a second horizontal shaft; an elastic body such as a spring lying between this plate and the block; a backrest supporting member on which a backrest can be mounted, the supporting member being elongated and carried in part on the lower face of the seat plate and pivotally engaged with a long hole formed at the rear end of the seat plate by a third horizontal shaft; the forward part of this supporting member mounted on the pedestal block by the first shaft pivotally engaging the arm member with the block; and a gas spring connecting between a fourth shaft mounted on the front end of this supporting member and the second shaft positioned at the front end of the arm member. |
