| 摘要 |
An upper bar and a lower bar are parallel with respect to each other and are separated by a distance. A slanted bar, vertical bar, and side bar form a triangular frame with one end of the slanted bar and one end of the vertical bar connected to one end of the upper bar. The opposing end of the vertical bar is releasably connected to one end of the side bar while the opposing end of the side bar is connected to the lower bar. Another slanted bar, vertical bar, and side bar are similarly connected at the other end of the upper and lower bars. The upper bar, lower bar, and two slanted bars include releasably connected tubular members. And both ends of the slanted bars are connected with rotatable joints. Netting may be woven onto the upper bar, the lower bar, the vertical bars, and the side bars.
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