| 摘要 |
A control for a spring biased tilting chair such as an office swivel chair or a platform rocker has a slotted spring ring means which is either a set of aligned slotted spring rings or a single long slotted spring ring or sleeve. A tension adjusting member on the base or head piece has a finger which projects into the slot, and there is a tension member on the tilting member which also has a finger projecting into the slot. The tension adjusting member is operatively connected to an adjusting hand wheel to vary prestress in the ring means, which resiliently resists tilting movement of the tilting member. The structure is equally applicable to an executive chair a secretarial posture chair, an executive posture chair or a platform rocker. |
