Modular wheel assembly for a carriage in a mobile storage system

A method of mounting a wheel to a carriage in a mobile storage system, wherein the carriage is configured to support one or more storage units for movement on a rail, comprising the acts of:

• providing the carriage with a wheel mount structure having a first sidewall spaced apart from a second sidewall;
• forming an opening in each of the first and second sidewalls of the wheel mount structure;
• providing a wheel assembly including a shaft, a wheel mounted to the shaft, and a first and a second mounting member to which the shaft is rotatably mounted, wherein the wheel is located between the first and second mounting members;
• engaging each of the first and second mounting members within the opening in one of the spaced apart first and second sidewalls of the wheel mount structure;
• and
• securing each of the first and second mounting members to the wheel mount structure sidewalls.

In a mobile storage system including one or more storage units and a carriage adapted to movably support the one or more storage units on one or more rails, the improvement comprising:

• a wheel mount structure associated with the carriage;
• and
• a wheel subassembly engagement with the wheel mount structure, the wheel subassembly including:
• a wheel configured to engage one of the rails;
• a first and a second mounting member between which the wheel is located;
• and
• a shaft that is rotatably supported by the first and second mounting members, wherein the wheel is non-rotatably secured to the shaft, and wherein the wheel mount structure and the first and second mounting members include cooperating engagement structure for non-rotatably engaging the first and second mounting members with the wheel mount structure.