Modular storage

An adjustable refrigeration rack system, comprising:

• a pair of parallel shafts arranged on a rear interior cabinet side of a refrigerator;
• a plurality of attachment mechanisms, each attachment mechanism having one attachment mechanism to selectively engage a respective one of the parallel shafts and configured to hold a shelf and selectively engage the respective shafts,
• wherein each attachment mechanism includes a clamping mechanism having two halves, each defining half of a shaft opening and configured to engage the shaft when the halves are in an engaged state, and disengage when the halves are in a disengaged state,
• wherein each of the halves of the clamping mechanism define a wall opposite the wall of the other of the halves, the clamping mechanism including a rotatable cam arranged between the walls on a side of the halves and having a lever portion configured to selectively apply pressure to at least one of the walls to push the halves apart, creating a gap between the halves to create the disengaged state;
• and
• a drive mechanism having a central gear arranged on a central shaft extending between the pair of parallel shafts and a worm gear arranged at each parallel shaft and fixed to the central shaft such that rotation of the central shaft activates each worm gear to rotate the parallel shafts, the drive mechanism configured to drive the shafts vertically when the clamping mechanism is in the disengaged state, wherein movement of the shafts causes movement of the shelf arranged on the attachment mechanisms selectively engaged with the shafts.