Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1992-05-15
1993-01-05
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 55, 411 70, 411903, F16B 1306
Patent
active
051764814
ABSTRACT:
An expansion dowel has a friction reducing coating on the contacting surfaces formed by an inside surface an an expansion sleeve and an outside surface of the shank contacting the inside surface of the sleeve. The coating effects a smaller friction value between the expansion sleeve and the expansion part than the friction value between the expansion sleeve and the surface of a borehole into which the dowel is inserted. This difference in friction assures an effective re-expansion of the expansion dowel in a fractured or broken tensile zone of a receiving material containing the borehole. In addition to the coating, protrusions arranged in pairs are formed on the outside surface of the expansion sleeve for maintaining contact with the borehole surface, particularly in the broken tensile zone during large displacement of the expansion dowel.
REFERENCES:
patent: 2518468 (1950-08-01), Harding
patent: 3709089 (1973-01-01), Seetaram
patent: 3750526 (1973-08-01), Lerich
patent: 3766819 (1973-10-01), Giannuzzi
patent: 4688977 (1987-08-01), Seetaram
patent: 4702654 (1987-10-01), Frischmann et al.
Hilti Aktiengesellschaft
Wilson Neill R.
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