Push-button switch

Electrical resistors – Strain gauge type

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Details

338 12, 338198, 7386265, G01L 122

Patent

active

046443150

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.

REFERENCES:
patent: 4021766 (1977-05-01), Aine
patent: 4267725 (1981-05-01), Roth et al.
patent: 4411159 (1983-10-01), Spear et al.

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