| 摘要 |
A backrest elevation adjustment assembly is provided, which is mainly composed of an L-shape member, a sliding member, and a multi-step positioning member. A seat supporting board is attached to the horizontal section of the L-shape member and the sliding member, which is attached to a backrest supporting board, is installed on the vertical section of the L-shape member, surrounding the multi-step positioning member embedded in the vertical section of the L-shape member. The sliding member could be slid up and down along the vertical section of the L-shape member and fixed at a number of pre-determined positions provided by the multi-step positioning member. With the elevation adjustment assembly, a chair's backrest could be adjusted to suit a sitter's specific posture so as to achieve comfortable seating.
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