Elderly often encounter difficulty in rising themselves from or lowering themselves into a  chair; annually 1200 independently living elderly in The Netherlands end up in hospital  after a fall from a chair. In cases where no personal assistance is available, mechanical,  hydraulic or pneumatic sit/stand devices have been developed. Still elderly complain  about difficulties standing up. Existing devices require a greater muscle force than any  force rising from a normal chair, they throw the user forward, cause instability and are  often big and heavy. The StanGo is a portable sit to stand device, that assist the user  during the whole movement in a radual way using spring energy.                                  In cooperation with T.Mandersloot