CHAIR BACKREST DEVICE
1 Assignment
0 Petitions
Accused Products
Abstract
A backrest device for a chair, capable of, without a reduction in its strength and rigidity, effectively bending backward so as to follow the shape of the back of a person seated on the chair, providing the person with excellent sitting comfort. In the backrest device, a back board is supported by a backrest frame, and the back board has a flexible back stopper on the inner side of a back frame. The thickness of a vertical intermediate section of the back stopper is gradually increased from both left and right sections of the intermediate section toward the center such that the thickness is less in both left and right sections and is maximum at the center.
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Citations
22 Claims
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1-11. -11. (canceled)
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12. A chair backrest device comprising:
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a backrest frame; and a backrest shell supported by the backrest frame, the backrest shell comprising a back frame and a flexible back support within the back frame, the back support being the thickest in the middle of width and gradually getting thinner horizontally from the middle toward each side. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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13. A chair backrest device comprising:
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a backrest frame; and a backrest shell supported by the backrest frame, the backrest shell comprising a back frame and a flexible back support within the back frame, the back support being the thickest in the middle of length and gradually getting thinner vertically from the middle toward upper and lower ends.
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14. A chair backrest device comprising:
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a backrest frame; and a backrest shell supported by the backrest frame, the backrest shell comprising a back frame and a flexible back support within the back frame, the back support being the thickest in the middle and gradually getting thinner from the middle toward sides horizontally and toward upper and lower ends vertically.
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Specification