Lumbar support
First Claim
1. A back portion for a chair, the back portion comprising:
- a peripheral frame with an opening therein and at least a top member and two spaced apart sides members; and
a resiliently flexible material attached to the frame and drawn taut across the opening, wherein each of the sides members of the peripheral frame is resiliently flexible in a forward and rearward direction at least at an intermediate region corresponding to the lumbar region of an adult occupant of the chair to allow the back portion of the chair above the intermediate region of the peripheral frame to bend rearwardly about the intermediate region of the peripheral frame relative to the back portion of the chair below the intermediate region of the peripheral frame, and the side members are substantially inflexible towards one another to inhibit loss of tautness of the flexible material across the opening during said bending of said back portion of the chair about the lumbar region, and moreover the sides members being of such a construction that the neutral axis of bending of the peripheral frame is closet to a front surface of the peripheral frame than to a rear surface of the peripheral frame to minimise stretching of the resiliently flexible material during said bending of said back portion of the chair about the lumbar region.
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Accused Products
Abstract
A back portion for a chair includes a peripheral frame defining an opening therein. A lumbar support portion is disposed in the opening. The lumbar support portion comprises a substantially rigid panel. Two hinge devices are hingedly mounted on opposite sides of the peripheral frame. The lumbar support portion is mounted on the peripheral frame by the two hinge devices. Each hinge device has a biasing device associated with it to bias the hinge devices forwardly relative to the peripheral frame. A cushion may be mounted atop the lumbar support portion. The cushion has a first substantially planar sheet of resiliently flexible material and a second substantially planar sheet of resiliently flexible material. The first and second sheets are separated by a plurality of spaced webs of resiliently flexible material.
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Citations
12 Claims
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1. A back portion for a chair, the back portion comprising:
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a peripheral frame with an opening therein and at least a top member and two spaced apart sides members; and
a resiliently flexible material attached to the frame and drawn taut across the opening, wherein each of the sides members of the peripheral frame is resiliently flexible in a forward and rearward direction at least at an intermediate region corresponding to the lumbar region of an adult occupant of the chair to allow the back portion of the chair above the intermediate region of the peripheral frame to bend rearwardly about the intermediate region of the peripheral frame relative to the back portion of the chair below the intermediate region of the peripheral frame, and the side members are substantially inflexible towards one another to inhibit loss of tautness of the flexible material across the opening during said bending of said back portion of the chair about the lumbar region, and moreover the sides members being of such a construction that the neutral axis of bending of the peripheral frame is closet to a front surface of the peripheral frame than to a rear surface of the peripheral frame to minimise stretching of the resiliently flexible material during said bending of said back portion of the chair about the lumbar region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification