| 摘要 |
A structural lock for connecting a horizontal arm to a vertical column designed to positively prevent inadvertent disengagement. Two separate connections are made at opposite sides of the column to lock the end of the horizontal arm to the column. The first connection is pivotal about a vertical axis, and it is then required that the arm be pivoted into position to subsequently make the second connection on the opposite side of the column. Loading of the arm causes firmness of the lock to increase.
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