Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Patent
1993-04-08
1994-07-26
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
411 54, 411107, F16B 1304, F16B 1306
Patent
active
053323467
ABSTRACT:
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.
REFERENCES:
patent: 1762349 (1930-06-01), Phillips
patent: 2963935 (1960-12-01), Shields
patent: 3889570 (1975-06-01), Polos
patent: 4818163 (1989-04-01), Bereiter et al.
Wilson Neill R.
Yugenkaisha Shinjo Seisakusho
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