| 摘要 |
A retrofit height adjustable seat for a chair having a support frame having a base for connection to the support frame and a top seat frame include a displacement mechanism movably interconnecting the base, a rack operably connected to one of the base and top seat frame and pinion operably connected to the rack. The displacement mechanism includes a pair of interconnected scissor arms which in a retracted mode are in a generally parallel position relative to one another rendering the top seat frame seat adjacent the base and when in an extended mode are in a generally nonparallel position relative to one another rendering the top seat frame seat displaced away from the base.
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