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This article describes a springless contact for providing probe contact forces and displacements in electrical testing and for other purposes such as electrical switches and controls.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
90% of the total text.
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This article describes a springless contact for providing probe contact forces
and displacements in electrical testing and for other purposes such as electrical
switches and controls.
The springless contact comprises permanent magnets 2 and 4, housing 1,
probe or contact tip 3, flexible conductor 5, and insulated cable wire 6. Probe tip
3 is attached to permanent magnet 2 which is free to slide up and down in
housing 1. Permanent magnet 4 is attached to the walls of housing 1 and is not
free to move. The like magnetic poles of magnets 2 and 4 face each other
causing magnet 2 and probe tip 3 to be repelled downward. Probe tip 3 is
connected to cable wire 6 by means of flexible conductor 5 which passes through
holes 8 and 7 in magnets 2 and 4.
In another embodiment shown in Fig. 2, the flexible conductor 5 is attached
to magnets 2 and 4, with cable wire 6, in turn, being attached to magnet 4.
In operation, the entire contact assembly is displaced downward, with the
probe tip being brought into contact with a test pad on a substrate or printed-
Some advantages of this contact are as follows: 1. It eliminates contact problems associated with springs,
e.g., springs sticking or jamming, spring failure due to
fatigue, and spring failure due to corrosion. 2. It can be used in environments where extremely high and low
temperature conditions prohibit the use of springs and other
force-producing means. 3. It can be used in switches and cont...