| 摘要 |
A chair has a pair of spaced-apart back support mounting members (20r, 20l), a lower back support (40) adapted to support the lower portion of the back of a person seated on the chair and mounted on the back support mounting members for pivotal movement about a pivot axis (LA) located at substantially the vertical centerline of the lower back support, and an upper back support (42) adapted to support the upper portion of the back of a person seated on the chair and mounted on the back support mounting members for pivotal movement about a pivot axis (UA) located at substantially the vertical centerline of the upper back support.
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