| 摘要 |
A low profile knee-tilt chair control for controlling biased tilting between a chair seat plate and a chair base plate of a pedestal base chair wherein the chair base plate is supported by a single vertical spindle at the rear of the base plate, and the chair seat plate pivots about a horizontal axis at the front of the base plate. The chair seat is biased to an at-rest position by a low profile, conical helical compression spring operable between the base plate and chair seat and located between the spindle and the horizontal pivot axis of the base plate. The low profile, conical helical compression spring is so mounted relative to the base plate and chair seat plate that the small coils of the compression spring may pass through the large coils during compression of the spring. The control is further characterized by a lockout for securing the chair seat plate against tilting relative to the base plate in either of two different, selectable, at-rest positions. |
