| 摘要 |
An elastic waist support is installed between a back frame and a mesh member of a chair, and can be adjusted in height; the back frame consists of a front frame part, and a rear frame part, which are firmly joined together; the mesh member covers a front side of the front frame part with a periphery thereof being sandwiched between the front and the rear frame parts; the back frame has two opposite supporting extensions protruding from inward sides of two longitudinal portions thereof; each of the supporting extensions has a guiding groove thereon; the waist support has two joining protrusions thereon, and it is joined on the back frame with the joining protrusions being respectively embedded in the guiding grooves.
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