| 摘要 |
An open frame has a base. The base has horizontal parallel legs. The base has first free ends and second ends. An integral horizontal connecting leg is between the legs. The open frame has a pivotable support. The open frame has angled legs. The angled legs have lower ends and upper ends. A connecting plate is provided between the ends. The open frame also has a pair of pivot brackets. Each bracket has a lower pin pivotably extending through the first end of a horizontal leg. Each bracket has an upper pin pivotably extending through the lower end of an angled leg. A cylindrical lower hoop is coupled to the connecting plate. A cylindrical upper hoop has an operative position such that it is centered over the first hoop. Secured to the upper hoop is a plate. The second hoop may be rotated from the first hoop.
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