| 摘要 |
The present invention relates to a ball transfer capable of moving or rotating a direction of a weight by little force and to a ball transfer providing a coupling tool by a spring washer to robustly and stably couple a balling ball cover to a housing and to easily assemble them wherein the balling ball cover includes a wiper for preventing a rolling ball, for lifting the weight, from being separated from the housing and eliminating abnormal materials from the rolling ball. |
