Expansion dowel with anchored state indicator

Details Expansion dowel with anchored state indicator Expansion dowel with anchored state indicator

1986-02-26

1987-09-08

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 9, F16B 1306

Patent

active

046920765

ABSTRACT:
An expansion dowel includes an axially elongated expansion sleeve, an expansion body and a threaded bolt secured to the expansion body. The expansion sleeve has a leading end arranged to be inserted first into a borehole in a receiving material and a trailing end. The expansion sleeve is slotted in the axial direction from the leading end so that the sleeve expands radially as the threaded bolt draws the expansion body into the leading end of the sleeve. Further, the sleeve has an axially deformable region between the leading and trailing ends. A shoulder extends radially outwardly from the sleeve adjacent the trailing end. A disc is held on the outside of the sleeve spaced axially from the shoulder toward the leading end of the sleeve. During the placement of the dowel, as the expansion body is drawn into the leading end of the sleeve, a minimum anchoring value is reached. After reaching the minimum anchoring value, the sleeve is axially deformed. At the same time, the disc overcomes the holding action maintaining it spaced from the shoulder and it moves axially toward the trailing end into contact with the shoulder affording a visible indication of the anchored state of the dowel.

REFERENCES:
patent: 1394925 (1921-10-01), Marshall
patent: 3285120 (1968-11-01), Kartiala
patent: 3735665 (1973-05-01), Mordensen
patent: 4088054 (1978-05-01), Lippacher et al.
patent: 4112813 (1978-09-01), Kuhlmann
patent: 4330230 (1982-05-01), Giannuzzi

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