| 摘要 |
A roller unit for use as a caster for luggage, for example, has a sturdy one-piece roller housing formed of sheet metal, the housing comprising a rectangular base with raised pads at opposite ends thereof and a roller-receiving shell defined by a pair of opposed U-shaped walls bent from opposite longitudinal edge regions of the base between the pads. Roller units are manufactured seriatim by metal forming operations that do not require deep-drawing. |
