| 摘要 |
A construction-use plumb bob structure comprised of a blunt top, pointed bottom conical body having a thread-fastened sharp tip and a cord conjoining component respectively installed at its upper and lower extremities, wherein a recessed cavity formed in the internal section of the body ensconces a filler material of similar shape, the external threads died along its lower extent of a dish-shaped attachment unit are fastened to the internal threads tapped along the upper extent of the recessed cavity, and a threaded section at the bottom end of a narrow gauge cord is fastened into the internal threads in the attachment unit. As such, since a filler material of different composition is ensconced inside the body, the present invention weighs the same as an originally solid plumb bob such that there are no differences during utilization. Furthermore, the invention herein achieves the objective of reducing production cost.
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