US Patent 7424893 Dishwasher

A dishwasher is disclosed, by which an installation height of a rack is adjusted inside a washing chamber and in which the installation height is automatically adjusted by a button. The dishwasher includes a washing chamber having tableware washed therein, a rack movably installed in the washing chamber to hold the tableware thereon, a plurality of guide rollers fixed to both confronting sidewalls of the washing chamber, a guide rail provided between the plurality of guide rollers to slide back and forth, and a height adjustment device configured to move the rack upward and downward, the height adjust device being provided to slide on the guide rail.