Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Patent
1988-09-22
1990-05-29
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
411 55, 411 60, F16B 1304, F16B 1306
Patent
active
049291343
ABSTRACT:
An expansion dowel assembly is made up of an anchor bolt and an expansion sleeve laterally enclosing the bolt. The sleeve is expanded by driving it in the axial direction relative to the bolt so that the leading end of the sleeve widens as it moves axially over a conically shaped expanding member at the leading end of the bolt. Cutting teeth are formed on the outer surface of the sleeve at its leading end and provide a saw-tooth section. The teeth cut into the surface of a borehole in a receiving material and form an undercut in the borehole surface as the sleeve is expanded. To facilitate expansion, an annular groove is located in the inside surface of and adjoining the cutting teeth. The annular groove is spaced on the opposite side of the cutting teeth from the leading end of the expansion sleeve.
REFERENCES:
patent: 688756 (1901-12-01), Tripp
patent: 2470924 (1949-05-01), Flogaus
patent: 4560311 (1985-12-01), Herb
patent: 4636123 (1987-01-01), Herb
patent: 4797044 (1989-01-01), Velasco
Peterson, Scott A., "Blind Fastener is Easy to Install", NASA Tech Briefs, Spring 1981, pp. 80-81.
Hilti Aktiengesellschaft
Wilson Neill R.
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