Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 11, 2008
Patent Application Number
11168687
Date Filed
June 28, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
A backrest adjustment device includes a bottom board, a support board movable relative to the bottom board, and two opposite linkages pivotally mounted between the support board and the bottom board to drive the support board to move relative to the bottom board to change the distance between the support board and the bottom board. Thus, the two linkages are pivoted to drive the support board to move relative to the bottom board to change the distance between the support board and the bottom board so as to adjust the position of the backrest relative to the seat.
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