a. A broad pulley or wheel fixed to the floor, roof, or sides of roadways to prevent a haulage rope running against the ground that would cause excessive friction and wear of rails and sleepers. Nelson
b. A component part of a roller chain in which it may serve only to reduce frictional loss occurring as the chain negotiates sprockets. Rollers may also serve as the rolling support for the chain and the load being conveyed.
c. A heavy vehicle used for compacting soil, earth fill, and top layers of spoil dumps to increase the density and bearing capacity of the material. Nelson
Source: Dictionary of Mining, Mineral, and Related Terms












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