Constant contact pressure PIM interface

Details Constant contact pressure PIM interface Constant contact pressure PIM interface

2004-12-31

2008-10-21

Jones, Stephen E (Department: 2817)

Wave transmission lines and networks

Resonators

Temperature compensated

C333S232000, C333S229000

Reexamination Certificate

active

07439830

ABSTRACT:
An interface that provides minimum changes in contact pressure over a thermal range is disclosed. The interface is a mated joint of given material, typically metallic, joined by a mechanical fastener or fasteners. The fastener(s) create contact pressure at the joint surface wherein the contact pressure variation over a temperature range is minimized by the use of a thermal compensator having a predetermined length. The thermal compensator's length is chosen by setting the thermally induced expansion delta to offset an equal delta created by the fastener and interface configuration. The difference in expansion of the mated joint and fastener is canceled by the equal, but negative, difference between compensator and fastener. This cancellation of expansion minimizes the change in contact pressure at the joint interface. Maintaining a constant pressure provides PIM reliability during temperature changes.

REFERENCES:
patent: 4321557 (1982-03-01), McNair
patent: 4450616 (1984-05-01), Morita
patent: 03224301 (1991-10-01), None

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