| 摘要 |
A height adjustment mechanism for chair backrest or arm comprises a tube-like brace having a transverse elongate groove and transverse apertures; a sliding member in the brace with an upper end secured to backrest or arm; a guide member coupled to a lower end of the sliding member; a hook flexibly coupled to the guide member having an upper bent free end; a first half-cylindrical member in the brace for receiving a portion of the sliding member and the hook, an internal notched member having curved members and a longitudinal channel; a second half-cylindrical member in the brace matingly secured to the first half-cylindrical member, an upper hole, a lower hole, and a spring-depressible detent in the lower hole; and a lock pin inserted through the groove and the upper hole to secure the brace and the second half-cylindrical member together. Backrest or arm may be pushed down to cause the bent end to move through the channel and pulled up to lock in one of the curved members. An adjustment of arm toward left or right is also possible.
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