Mercury displacement relay

Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Utilizing conductive liquid

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Details

335 47, H01H 2916

Patent

active

043664580

ABSTRACT:
The disclosure relates to a mercury displacement relay and a method of making the same which utilizes a spring totally submerged within the mercury to support a movable displacement plunger. A cylindrical electrode contains the mercury, and the spring is uniquely connected to the bottom portion of the electrode. The spring opposite end is attached to a bottom portion of the displacement relay, which is received within the cylindrical electrode so that its bottom portion is submerged in the mercury. A pin electrode is also received within the cylindrical electrode and insulated therefrom. Adapted to the cylindrical electrode is a coil device, which, upon being energized, moves the plunger upwardly to cause the mercury to recede and break contact with the portion of the pin electrode in contact with the mercury. Upon deenergizing the coil device, the spring draws downwardly on the plunger to cause the mercury to rise and make contact again with the pin electrode.

REFERENCES:
patent: 1930094 (1933-10-01), Hatay
patent: 1967954 (1934-07-01), Warnke
patent: 1971934 (1934-08-01), Hatay
patent: 2067235 (1937-01-01), Hedin
patent: 2070741 (1937-02-01), Larson
patent: 2247493 (1941-07-01), Harrison et al.
patent: 2303371 (1942-12-01), Larson
patent: 2401767 (1946-06-01), Larson
patent: 2474000 (1949-06-01), Keating
patent: 2980778 (1961-04-01), Hunciker
patent: 3187142 (1965-06-01), Elenbaas

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