by changing the length or the inclination of the legs

Full Title

Chairs adapted for special purposes (chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs, A61G5/00; operating chairs or dental chairs A61G15/00) > Reclining or easy chairs > having independently-adjustable supporting parts > for changing a straight chair into an easy chair > by changing the length or the inclination of the legs