An inclination adjusting linkage arrangement is disclosed for an open care bed or infant warmer having a mattress supported on a mattress base cantilevered from a columnar or vertically disposed "back bone". The mattress base includes a box like frame over which a sheet is stretched to provide tensioned...http://www.google.ca/patents/US6082693?utm_source=gb-gplus-sharePatent US6082693 - Inclination adjusting linkage arrangement for a supporting surface
