Breakaway plug ultrasonically bored from first thermoplastic part & ultrasonically bonded to surface of second thermoplastic part
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United States of America Patent
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May 24, 1994
Grant Date -
N/A
app pub date -
Dec 17, 1992
filing date -
Dec 17, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of providing an assembly of thermoplastic parts, which are separable upon the application of a predetermined force, includes assembling at least two thermoplastic parts in an overlapping relation and using an ultrasonically resonant horn for cutting a plug from the wall thickness of the first part and welding the plug to the underlying second part, whereby the upper portion of the plug remains surrounded by the wall of the aperture produced responsive to the cutting of the plug. Responsive to the application of a predetermined breakaway force effective on the plug, the plug breaks away from its attachment to the second part, causing the parts to become separable. The cross-sectional area of the plug is selected to meet a predetermined breakaway force requirement.
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