sentences:  A "cage gear", also called a "lantern gear" or "lantern pinion", has cylindrical rods for teeth, parallel to the axle and arranged in a circle around it, much as the bars on a round bird cage or lantern.The assembly is held together by disks at each end, into which the tooth rods and axle are set.Cage gears are more efficient than solid pinions, and dirt can fall through the rods rather than becoming trapped and increasing wear.