Chairs and seats – Bottom or back – Contoured back
Reexamination Certificate
2000-06-09
2002-06-25
Stephan, Beth A. (Department: 3636)
Chairs and seats
Bottom or back
Contoured back
C297S452320, C297S284400, C297S452150
Reexamination Certificate
active
06409268
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a chair back, and in particular to a one piece chair back which bends to a curvature that approximates the curvature of the back when it bends to provide lumbar and upper back support.
BACKGROUND OF THE INVENTION
It is well known that when a person leans back, as for example when sitting, the spine curves to accommodate the bending. Further, it is known that the spine does not bend in a smooth arc starting at the waist. Rather, the amount of curvature varies along its length. Thus, in the lumbar region the radius of bending is relatively small. As one moves up the spine the radius of bending increases until at the upper part of the spine there is virtually no bending.
Therefore, it would be desirable to have a chair back that would offer a high degree of support to the lumbar and upper back which bends to approximate the curvature of the back.
Further, it would be especially advantageous if such a chair were capable of being connected to a wide variety of chair bases and seats.
In addition, it would be advantageous if the chair back could support the spine when the person is twisting in the chair such as when leaning to the left or right such as when reaching across a desk.
SUMMARY OF THE INVENTION
Accordingly, with the foregoing in mind, the invention relates to an ergonomic chair back which includes an upwardly extending tab in the lumbar supporting part of the chair back and a plurality of downwardly directed generally curvilinear tabs that are disposed adjacent each other in an upwardly extending array from the lumbar supporting part of the chair back.
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Beck Stuart E.
Stephan Beth A.
Stylex, Inc.
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