| 摘要 |
A swing frame includes a pair of support frame units, a hollow horizontal bar, and two primary locking devices. Each of the support frame units includes upper, lower, and intermediate portions. The upper portion is formed with a horizontal hollow tube at the top end thereof. The horizontal bar has opposite end portions inserted respectively into the hollow tubes of the support frame units. The primary locking devices are disposed respectively on the end portions of the horizontal bar, thereby locking the end portions of the horizontal bar relative to the hollow tubes.
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