Patent 7475996 was granted and assigned to Coretronic on January, 2009 by the United States Patent and Trademark Office.
An elevating device includes first and second rack members interconnecting each other in such a manner to protrude downwardly from a lower opening of an outer casing in a double-step manner so as to be supported on a support surface. The elevating device adjusts an inclination angle of the outer casing relative to the support surface.