| 摘要 |
A pair of first and second elongated arms are provided and the arms include corresponding base and free ends. Pivot structure is provided and pivotally connects the base ends of the arms together for relative 360 DEG angular displacement and the pivot structure and second arm include coacting structure whereby the axis of relative pivoting of the first and second arms may be adjustably shifted along the second arm. Also, the first and second arms include coacting latch structure whereby the arms, in at least one predetermined position of the pivot structure along the second arm, may be releasably secured in a plurality of relatively angularly displaced positions.
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