Chairs and seats – Bottom or back
Reexamination Certificate
1999-09-29
2001-07-03
Nelson, Jr., Milton (Department: 3624)
Chairs and seats
Bottom or back
C297S440110
Reexamination Certificate
active
06254190
ABSTRACT:
TECHNICAL FIELD
Chair designs have been continually refined in order to insure that the occupant is seated with the correct posture to minimize and hopefully eliminate back pain. While the perfect chair has yet to be invented substantial strides have been made and continue to be made.
BACKGROUND ART
Various attempts have been made to design a chair that will insure correct posture and one such chair has been invented by the subject inventor as disclosed in U.S. Pat. No. 4,889,387. The chair in question while very satisfactory is somewhat complex and sufficiently costly that it does not lend itself to being used in a chair that is priced sufficiently low to reach a mass market and thus provide the desired benefit to a very large number of consumers. In essence there has long been a need to provide a relatively low cost chair that will maintain a sitter in the desired correct posture while resisting forward movement of the sitter from the seat.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a novel chair construction that is capable of having all the desired movements including seat height and tilt adjustment, synchronized back and seat angle adjustment and incorporates a novel seat construction that will provide the desired posture support. The seat is composed of a single sheet of fabric or mesh material having a front portion that is more resistant to deformation than its rear portion. The front portion is composed of high resilient elastic fibers that is tighter in construction than the rear softer portion that comprises less resilient elastic fibers. The sheet of fabric or mesh having the desired dual density resilience is formed of separate sections of fiber that are woven or sealed together to form a single fabric. Prior to installation in the seat frame the fabric is prestretched and while in its stretched condition is inserted into recesses in the seat frame and maintained in the stretched condition by suitable locking inserts.
The novel aspects of the applicant's invention will be apparent from the drawings and attached description.
REFERENCES:
patent: 5318348 (1994-06-01), Hess
patent: 5662383 (1997-09-01), Hand
patent: 5762403 (1998-06-01), Robinson
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