Abstract: A drive unit for driving an open-and-close body and a method for attaching the drive unit to the open-and-close body. The drive unit includes a cable, a drum, a pulley, a fix member, an elastic member, and a limiting member. The cable has a portion connected to the open-and-close body and another portion wound on the drum. The pulley is movable between a first position, where the pulley does not tension the cable, and a second position, where the pulley engages the cable and applies tension to the cable. The fix member is capable of fixing the pulley in the first position. The elastic member urges the pulley towards the second position. The limiting member is provided between the drum and the fix member, and the limiting member allows or limits rotation of the drum in accordance with the position of the pulley.

Abstract: This invention is a container or folder that can be used to hold a series of CDs, DVDs, or any number of similar objects. It is unique in that its components are made of a single kind of material and can be joined together without adhesives or other connectors. This makes it easy to add as many spaces for additional storage as is desired. Its simple construction makes it an inexpensive, expandable, and recyclable solution that is convenient for both the consumer and the manufacturer.