Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
March 31, 2015
Patent Application Number
14116992
Date Filed
May 11, 2011
Patent Citations Received
Patent Primary Examiner
Patent abstract
A backrest mechanism for a chair includes a pair of left and right side rods, each having a folded portion in a laid-V shape in a side view at a portion for supporting a sitting person around his or her lumbar, and a back plate that connects opposing surfaces of the side rods. An upper portion of the back plate above the folded portions serves as a flexible portion that is elastically deformable in a backward direction and that has smaller rigidity than the left and right side rods, and a lower portion of the back plate below the flexible portion serves as an inflexible portion that has greater rigidity than the flexible portion.
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