| 摘要 |
PCT No. PCT/GB84/00272 Sec. 371 Date Apr. 3, 1985 Sec. 102(e) Date Apr. 3, 1985 PCT Filed Aug. 8, 1984 PCT Pub. No. WO85/00734 PCT Pub. Date Feb. 28, 1985.A tilting mechanism for a chair includes a stationary support frame member for connection to an upright chair column, a seat frame member for mounting a seat portion of the chair, and a backrest frame member for mounting a backrest portion of the chair. The seat frame member defines a downwardly directed channel and respective horizontal pivots between parallel sides of the channel to pivotally mount the seat frame member to the support frame member, and the backrest frame member to the seat frame member, allowing the tilt of the seat and the backrest to be adjusted. The support frame member and the backrest member are connected by links to respective toothed quadrant members pivotally mounted in the channel. Locking levers in the channel are biased normally to lock the quadrants in position, but a control lever with a cam device thereon is operable to release either or both locking levers from the quadrants when adjustment of the tilt of the seat or backrest is required, the cam device lifting one or both locking levers against their bias depending on the position of the control lever. |
