Chairs and seats – Back movement resiliently opposed in operating position – Constantly oriented during up-and-down movement
Patent
1989-07-25
1991-08-27
Brown, Peter R.
Chairs and seats
Back movement resiliently opposed in operating position
Constantly oriented during up-and-down movement
297300, 297320, 297342, A47C 302
Patent
active
050428764
ABSTRACT:
A controller is provided for seating, and the like, such as chairs of the type that have a stationary base or support, and a back which tilts about a generally horizontal axis with respect to the support. The controller includes an adjustable tension device, which readily adapts the chair for different users and various applications. The adjustable tension device comprises a spring, having one end operably connected with a support, and the other end operably engaging the back at selected locations spaced apart from the tilt axis, such that rearward tilting of the chair back deflects the spring, and thereby generates a torque or back tension which resists further tilting. A shifter moves the other end of the spring between the selected back locations to vary the lever arm at which the spring acts, and thereby adjusts back tension.
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Brown Peter R.
Steelcase Inc.
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