Study of the prototype mechanism of height adjustment of the bed in hospital bed Ireneusz Malujda, Dominik Wilczyński, Krzysztof Talaśka, Dominik Wojtkowiak and Maciej Szulc MATEC Web Conf., 157 (2018) 02028 Published online: 14 March 2018 DOI: 10.1051/matecconf/201815702028