Patent attributes
A multiple steps rail arranged in the two opposite sides of a frame includes a retainer, a first sliding unit, and a second sliding unit in each side. The retainer is approximately a concave body and a plurality of stopping units are formed on proper positions thereof. The first sliding unit is approximately a bow body and can be sliding arranged into the retainer. The first sliding unit further has a dip switch and a double-side stopping unit on a side facing the retainer. The second sliding unit is sliding arranged into the first sliding unit and can be fixed to a case body with a side thereof. When the case body is drawing out, the second sliding unit will slide out from the first sliding unit and the first sliding unit will slide out from the retainer in order.
