Expansion dowel assembly with an expansion cone displaceable int

Details Expansion dowel assembly with an expansion cone displaceable int Expansion dowel assembly with an expansion cone displaceable int

1988-11-18

1990-02-06

Smith, Gary L.

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

Having separate expander means

Including sleeve and distinct tapered expander

411 57, 411 72, F16B 1306

Patent

active

048985058

ABSTRACT:
An expansion dowel assembly includes an axially extending anchor bolt and an expansion sleeve laterally enclosing the bolt. At its leading end, the anchor bolt has an expansion cone displaceable opposite to the insertion direction of the dowel assembly relative to a conically shaped expansion region at the leading end of the sleeve. Initially, the cone angle of the expansion cone is larger than the cone angle of the expansion section of the sleeve. A circumferentially extending annular bead is located on the outer circumferential periphery of the expansion region. The expansion region is slotted in the axial direction and its wall thickness decreases in the circumferential direction toward the slots. At the outset of the sleeve expansion, it is greatly widened and the annular bead is pressed into the surface of the borehole in which the dowel assembly is inserted. As a result, a positive locking engagement is provided between the expansion sleeve and the receiving material in which the borehole is formed, so that the dowel assembly can be utilized in a cracked-prone tensile zone of the receiving material.

REFERENCES:
patent: 612316 (1898-10-01), Downes
patent: 1035277 (1912-08-01), Veres
patent: 2661649 (1953-12-01), Skinner
patent: 3091991 (1963-06-01), Baker
patent: 4094223 (1978-06-01), Fischer
patent: 4137816 (1979-02-01), Gartner
patent: 4403894 (1983-09-01), Clark

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