TILTING MECHANISM FOR A CHAIR

摘要

A tilting mechanism for a chair of the typists type comprises a channel shaped first part (10) for attachment to the underside of the chair seat. A backrest carrying second part (11) and a pivot block (20) to be carried on a base of the chair are each pivotally connected to the first part (10) by respective horizontal pivots (12, 23). The second and third parts are connected by respective links (37, 44) to quadrants (34, 35) having recesses (36) in their upper edges for engagements with respective pins (52) of links (49). The links are releasable from the quadrants by a lever (61) pivotally mounted between the side flanges (13, 14) of the first part. The lever carries a cam (69) having shaped portions (72, 73) to engage the links (49) with different ones of the shaped portions engaging the links depending on the rotational position of the lever, whereby both links or only a selected one thereof are dis-engaged. By this means the angle of tilt of both the chair seat and the backrest can be adjusted together or independently as required.