Patent ID: 7334841
Filing Date: 2008-02-26
Classification: A47C

Abstract:
1. A chair lumbar support adjustment mechanism, comprising an angle adjustable lumbar support which is combined with a backrest of a chair, with the lumbar support having a lower projection including a pair of cylindrical protrusions at both sides with metal gaskets put thereon, an outer gear formed around one of the pair of cylindrical protrusions, and a through hole through the said pair of cylindrical protrusions, a shaft assembly having inner teeth inserted into the through hole and secured by a washer and an elastic element, with the lumbar support being disposed on and secured to a plate of the chair; with the lumbar support being adjustable when the inner teeth are disengaged from the gear and being positioned when the gear and the inner teeth are engaged together while the shaft assembly is retrieved due to the expansion of the elastic element.