A seat pad adjusting structure of a chair includes a base having a first side formed with an oblique catch extending downward in an inclined manner, and a second side provided with a backrest connecting bracket, a bottom plate mounted on the base and including a base plate secured on the base, an elongated...http://www.google.sh/patents/US6422650?utm_source=gb-gplus-sharePatent US6422650 - Seat pad adjusting structure of a chair
