| 摘要 |
A universal bearing includes a metal piece, a plastic housing and a spherical wheel. The metal piece includes a first insertion portion. The plastic housing wraps around the metal piece and includes a second insertion portion in communication with the first insertion portion. The spherical wheel is pivotally restricted in the first and second insertion portions. The plastic housing reduces the weight of the universal bearing. The plastic housing is formed by injection molding by injection plastic directly around the support portion, therefore, the assembly of the universal bearing will be completed automatically once the plastic housing is formed. |
