Method of making mercury containing reed switches

Details Method of making mercury containing reed switches Method of making mercury containing reed switches

1985-05-24

1986-12-23

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29622, 200263, 200266, 335 58, 335154, 427 11, 427123, 427242, H01H 1102

Patent

active

046303596

ABSTRACT:
The present disclosure relates to mercury containing reed switches and to methods of preparing switch blades for use in such switches. Heretofore such reed switches have been doped with mercury after the reed switch blades have been mounted in the envelope, the mercury migrating to the contact area of the switch blades, made of a mercury-wettable material, after sealing. The present invention avoids the expense and complexity of this procedure by improving the control of mercury dosing to enable improved performance of such reed switches in low power applications, for example in automatic test equipment, process control equipment and data processing terminals. This is achieved by doubly plating the switch blade tips with mercury-wettable metal, forming a mercury amalgam on the contact area of the switch blades prior to insertion of the blades in the glass envelope, by a process which employs a minimum amount of mercury sufficient for good switch function, subsequently sealing the switch blades into the glass envelope, and conditioning the switch blades in the finished switch.

REFERENCES:
patent: 3576415 (1971-04-01), Gywn, Jr.
patent: 4066859 (1978-01-01), Steinmetz

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