Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1986-12-12
1988-09-27
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 60, 411 80, F16B 1306
Patent
active
047738030
ABSTRACT:
An expansion dowel assembly is made up of an axially extending dowel body and an expansion member in contacting engagement with the dowel body. The expansion member extends in the axial direction of the dowel body and is formed by a main part and an extension part projecting axially from the main part in the insertion direction of the assembly into a borehole. The cross-sectional area of the extension part transverse to the axial direction is smaller than the adjacent corresponding cross-sectional area of the main part. The extension part is shaped relative to the main part to increase the contact area of the expansion member with the dowel body and to prevent the development of excessively high surface pressures at the front end of the expansion member.
REFERENCES:
patent: 3107570 (1963-10-01), Zifferer
patent: 4560311 (1985-12-01), Herb et al.
patent: 4640654 (1987-02-01), Fischer et al.
patent: 4659270 (1987-04-01), Herb
Herb Armin
Huegel Robert
Hilti Aktiengesellschaft
Wilson Neill
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