Backrest of chair
OwnerEiichirou Tanakainventor
Life of this patent
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Abstract
Provided with a backrest of a chair capable of reducing lumbago and fatigue by supporting a spinal column (2) straightly. A backrest (1) of a chair to support a back of erector spinae muscles (6, 6) with a planar rigid body in a region from both shoulder blades (3, 3) to both iliac bones (4, 4) for straightly supporting a spinal column (2) while avoiding an influence of both shoulder blades (3, 3) and both iliac bones (4a, 4a), wherein a width of the planar rigid body is broadened to right and left within a range where the planar rigid body is not in contact with a lower part of the ribs and both iliac crests (4a, 4a).
Claims2
A backrest of a chair, wherein
- a width of the backrest is broadened to right and left at an intermediate portion in a vertical direction,
- the width of the intermediate portion is 30 cm,
- the width of a lower portion located below the intermediate portion is 8 cm at a bottom end of the lower portion and 10 cm at a top end of the lower portion,
- the width of an upper portion located above the intermediate portion is 13 cm at a bottom end of the upper portion and 8 cm at a top end of the upper portion,
- the height from the bottom end of the lower portion to the top end of the upper portion is 33 cm,
- the height of the lower portion is 6 cm,
- the height of the intermediate portion is 13 cm, and
- the backrest is formed by a planar rigid body.
A backrest of a chair, wherein
- a width of the backrest is broadened to right and left at an intermediate portion in a vertical direction,
- the width of the intermediate portion is 30 cm,
- the width of a lower portion located below the intermediate portion is 8 cm at a bottom end of the lower portion and 10 cm at a top end of the lower portion,
- the width of an upper portion located above the intermediate portion is 13 cm at a bottom end of the upper portion and 8 cm at a top end of the upper portion,
- the height from the bottom end of the lower portion to the top end of the upper portion is 33 cm,
- the height of the lower portion is 6 cm,
- the height of the intermediate portion is 13 cm,
- the backrest is formed by an elastic material having flexibility, and
- a rigid board is arranged behind the backrest to maintain a planar shape of the backrest.
Dependencies are inferred from the claim text.