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Switching Through Mercury Deposits Disclosure Number: IPCOM000087276D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 52K

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Related People

Marchant, JW: AUTHOR


Described is a switch which maintains a constant contact resistance.

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Switching Through Mercury Deposits

Described is a switch which maintains a constant contact resistance.

As shown in Fig. 1C, the rotary type selector switch includes a selector knob attached to a main shaft. A stationary doughnut-shaped outer drum with mercury deposits (Fig. 1A) is positioned symmetrical to the main shaft. An inner rotating drum (Fig. 1B), having a plurality of coils or circuits to be switched, is positioned internal to the outer drum and symmetrical to the main shaft.

Each circuit of the inner drum is associated with a pair of contacts positioned on the periphery of the rotating inner drum. Signal disk or slip rings are used for externally coupling to the contacts of the inner drum. By rotating the selector knob, different pairs of contacts on the inner drum come in contact with the mercury deposit at the bottom, i.e., the lower portion, of the outer drum, thereby effectuating electrical conductivity.


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