Expansion dowel with an expansion wedge and an annular expansion

Details Expansion dowel with an expansion wedge and an annular expansion Expansion dowel with an expansion wedge and an annular expansion

1985-04-11

1986-09-16

Smith, Gary L.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having separate expander means

Including sleeve and distinct tapered expander

411 75, F16B 1306

Patent

active

046119639

ABSTRACT:
An expansion dowel arranged to be anchored in a borehole includes an axially extending dowel member having a leading end and a trailing end and being partly sleeve-shaped extending from the trailing end. A wedge-shaped recess is formed inwardly from the outside surface of the dowel with the depth of the recess decreasing toward the leading end of the dowel member. A complementary shaped wedge member is located in the recess and is displaceable therein toward the leading end of the dowel member. An annular groove formed in the dowel member from the leading end toward the trailing end. The depth of the annular groove increases for at least a part of the axial length from the leading end of the dowel member. An expansion member is seated in the annular groove and extends around the dowel member. The expansion member has a stop shoulder located in the path of the wedge member as it is displaced toward the leading end. The wedge contacting the stop member moves the expansion member toward the leading end of the dowel member causing the expansion member to spread radially outwardly. Further, an axial loading on the dowel member at its trailing end tending to pull it out of the borehole effects a post expansion action due to the interaction of the expansion member and the wedge member.

REFERENCES:
patent: 3799027 (1974-03-01), Galloway
patent: 4560311 (1985-12-01), Herb

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