Push-button switch
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United States of America Patent
Stats
-
Feb 17, 1987
Grant Date -
N/A
app pub date -
Nov 15, 1984
filing date -
Nov 18, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a push-button switch, the switch element is a cantilever (2) of thin silicon strain gauge material with a small magnet (1), e.g. of samarium cobalt alloy at its free end. Adjacent to the free end there is an annular magnet (3), e.g. of plastics material impregnated with samarium cobalt alloy, on the push rod (4) of the switch. The annular magnet (3) is so poled that movement of the rod (4) causes, due to magnetic forces, the deflection of the silicon strain gauge to give an electrical output. The return force, plus collapse action, is provided by a soft iron collar (5) on the switch structure.
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Cited Art Landscape
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