Patent ID: 8414075
Filing Date: 2013-04-09
Classification: A47C

Abstract:
1. A chair adjustment structure comprising: a base member; a top cover disposed at a top side relative to said base member and having a middle part thereof pivotally connected to said base member; a spring member mounted to said base member and having a top end stopped against said top cover; a back bracket having two sidewalls, each of which has a first extension portion disposed at one lateral side of said base member, a second extension portion obliquely upwardly extending from said first extension portion, a first pivot portion located on one end of said first extension portion and pivotally connected to said base member, and a second pivot portion located on said first extension portion adjacent to said second extension portion and pivotally connected to said top cover; a seat frame assembly, wherein said seat frame assembly comprises: two axles respectively pivotally connected to said top cover; four links each having a bottom end pivotally connected to one of two ends of one of said axles; four torsion springs respectively mounted to one of two ends of each of two axles, each said torsion spring having two ends respectively stopped against said top cover and said links; and a seat frame pivotally connected to top ends of said links.