Expansion dowel assembly with a spherically shaped spreader

Details Expansion dowel assembly with a spherically shaped spreader Expansion dowel assembly with a spherically shaped spreader

1984-09-28

1986-08-26

Holko, Thomas J.

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

Having separate expander means

Including sleeve and distinct tapered expander

411 55, 411 57, 411537, F16B 1306

Patent

active

046079920

ABSTRACT:
An expansion dowel assembly includes an axially elongated expansion sleeve with an axially extending expansion region, a spreader positioned within the sleeves in the expansion region, and a bolt in threaded engagement within a tapped bore in the spreader so that the spreader can be displaced axially through the expansion region for widening it in the radial direction. The surface of the spreader in surface contact with the interior of the sleeve is spherically shaped. In the assembled state, before expansion, the spreader is held in the expansion sleeve against axial displacement. Accordingly, the parts of the assembly can be preassembled as a unit.

REFERENCES:
patent: 2403541 (1946-07-01), Molat
patent: 3760802 (1973-09-01), Fischer et al.
patent: 4315393 (1982-02-01), Schack et al.
patent: 4403894 (1983-09-01), Clark

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