| 摘要 |
A concrete anchor has an anchor body 21, which is a rod-shaped member 22 having a male thread 23 and a striking head 24, both formed at one end of the member. This rod-shaped member 22 further has at its another end a cylindrical portion 25 so that slots 26 extend axially from an open end of the portion so as to provide expandible feet 27. Saw-toothed scratching tips 28 are formed to be acute ends of the expandible feet. A tapered plug 31 which is inserted in the cylindrical portion 25 has an annular recess 34 and a retaining shoulder 36, both formed between a large diameter portion and a root 35 of the tapered plug, with the annular recess providing a cavity to receive concrete scrapings, so that an impact applied to the striking head can provide a strong and effective retention force for the concrete anchor, and any cracks which may be produced around a hole holding the fixed anchor does not impair the retention force.
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