| 摘要 |
A frame includes a plurality of L-shaped elbow members and tubes. Each elbow member includes two extension tubes and each extension tube has an open end and a hole is defined through a wall proximate to the open end. Each tube includes two open ends so as to be inserted into the open ends of the extension tubes of the elbow members. Each open end of each of the tubes has a hole defined through a wall proximate to the open ends. A C-shaped connection member is biased in the open end of each tube and has a protrusion which is inserted in the aligned holes of the tubes and the extension tubes.
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