Patent ID: 7717513
Filing Date: 2010-05-18
Classification: A47C

Abstract:
1. A chair, comprising: a leg body, a base supported by the leg body, and a back frame supported by the base, said back frame including a pair of reactive force frame elements, each of which elastically biases the corresponding one of said pair of upper frame elements from said rear end position to said normal position, wherein each of said pair of reactive force frame elements changes the elastically biasing force on the corresponding one of said pair of upper frame elements in accordance with rocking movement of the corresponding one of said pair of lower frame elements and is attached at a lower end thereof to said base, wherein said pair of upper frame elements are rockable independently of each other, wherein said pair of upper frame elements extend to the top of said back frame, and wherein each of said pair of lower frame elements is arranged on a right and left side of said chair and forms a substantially L-shape bent upward at a rear end, in a side view.