Tilt mechanism for pedestal chair.

摘要

The seat (11) and pedestal (16) of a chair (10) are joined by a knee-tilt mechanism (18) comprising a first support (22) fixed to the underside of the seat (11) adjacent its front edge, and a second support (21) fixed to the pedestal (16). The first support (22) has bearing hubs (35) rotatably engaged with a support tube (43) to define a horizontal tilt axis (19). A restoring mechanism disposed within the second support (21) for exerting a restoring torque about the tilt axis (19) for developing a substantially linearly increasing restoring torque as the seat (14) tilts away from the horizontal position, and second spring arrangement (51) for generating a second restoring torque which is additive with the first torque to effectively cause a torque dwell to facilitate tilting beyond an intermediate position, one pivot (55) of the second spring arrangement (51) being fixed to the second support (21) and another pivot (59) thereof being guided by a fixed cam slot (61) and coupled to the first support (22) by a lever (63).