Patent ID: 7370587

Claim:
A carriage for a mobile storage system, wherein the carriage is adapted for placement over a rail and is configured to support at least one storage unit for movement on the rail in response to a drive arrangement, comprising: a wheel mount structure; a shaft defining a pair of ends; a wheel mounted to the shaft; 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 and wherein each end of the shaft extends outwardly from one of the first and second mounting members; and a cooperating mounting arrangement associated with the wheel mount structure and the first and second mounting members for non-rotatably mounting the first and second mounting members to the wheel mount structure, wherein the cooperating mounting arrangement is configured such that the wheel extends downwardly from the wheel mount structure for engagement with the rail and wherein the ends of the shaft extend outwardly from the wheel mount structure, and wherein one of the ends of the shaft engages a drive arrangement associated with the carriage that imparts rotation to the shaft and thereby imparts rotation to the wheel.