Expanded – threaded – driven – headed – tool-deformed – or locked-thr – With means to indicate application of predetermined... – Including gauge means
Patent
1999-02-05
2000-05-09
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
With means to indicate application of predetermined...
Including gauge means
411 8, 411263, 411307, F16B 3102, F16B 3930
Patent
active
060595000
ABSTRACT:
An arrangement for detecting a fatigue fracture caused by overstressing of a bolted connection including a bolt and an internal-thread-bearing hollow section which is alternately stressed by an axial flux of force between zero and different maximal values. A transverse crack forms at a predetermined breaking point of the bolted connection, at which the hollow section breaks due to fatigue. The spacing of the predetermined breaking point from the connection ends, and the interaction of the bolt and the hollow section, are designed such that, after the breakage, the bolt forms in the hollow section a residual joining connection which can be alternatingly stressed. In order to signal the occurrence of a crack on the hollow section of the bolted connection in the event of a fracture caused by fatigue in a simple and always noticeable manner, the arrangement has an additional signaling device. The signaling device is arranged at least on the section of the residual joining connection formed by the area with play of the bolted connection such that the crack causes its destruction, whereby the device causes at least one signal which can be noticed visually or acoustically. The signaling device may be microcapsules containing dye arranged in the threads, a hollow space adjacent the bolt filled with pressurized gas, or a ripping wire attached to the hollow section.
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Long-Lok, Schraubensicherungen GmbH brochure, 6 pages.
Dirmeier Georg
Emmann Siegfried
Haller Manfred
Daimler-Chrysler AG
Wilson Neill
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