Prestress-monitoring element for screw-type anchors

Details Prestress-monitoring element for screw-type anchors Prestress-monitoring element for screw-type anchors

1995-05-19

1996-12-24

Wilson, Neill R.

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

With means to indicate application of predetermined...

Axially deformable member or portion

411 14, 116212, 116DIG34, F16B 3102, G01L 500

Patent

active

055868517

ABSTRACT:
A prestress-monitoring element for screw-type anchors is arranged to be inserted like a washer between a nut and an article to be fixed and includes a pressure ring and an expansion ring. If the nut provided for fixing is tightened, then the resultant axial prestress causes the pressure ring to expand the expansion ring until the nut lies against the expansion ring. In this end position, a prestress required by the construction of the prestress-monitoring element is achieved. The position of the nut on the pressure ring can be monitored visually, as a result of which the prestress can be indirectly monitored.

REFERENCES:
patent: 3087371 (1963-04-01), Orner
patent: 3216303 (1965-11-01), Melzer
patent: 3405597 (1968-10-01), Elsner et al.
patent: 3948141 (1976-04-01), Shinjo

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