Chairs and seats – Back movement resiliently opposed in operating position
Reexamination Certificate
2006-04-04
2006-04-04
Brown, Peter R. (Department: 3636)
Chairs and seats
Back movement resiliently opposed in operating position
C297S297000, C297S301100
Reexamination Certificate
active
07021712
ABSTRACT:
A chair with a flexible resilient back support structure includes a hollow tubular seat frame, a hollow tubular backrest frame pivotally connected to the seat frame, and a limit stop affixed to the backrest frame or the seat frame adjacent to the pivot points. The limit stop is configured to limit a degree of rotation of the backrest frame between an upright position and a maximum backwardly rotated position. An elongate spring element extends from within the backrest frame into the seat frame, and is configured to bias the backrest frame in the upright position, and to resiliently resist backward rotation. In various embodiments, a cam surface is associated with the spring element, providing an effective fulcrum point which moves rearwardly as the backrest frame reclines, thereby increasing the effective flexural resistance of the spring element during reclining.
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Hardy Louis N.
Spendlove Dale
Brown Peter R.
Mity-Lite, Inc.
Thorpe North & Western
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