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Mercury Magnetic Commutator

IP.com Disclosure Number: IPCOM000097593D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Bourne, DA: AUTHOR

Abstract

In sampling a number of low level circuits in sequence, a low noise commutator having low contact resistance is desirable. A pool of mercury receiving individual projectable contacts provides the required low noise and contact resistance without excessive force. If the contacts are made movable by a magnetic force, such a commutator is smooth acting and wear resistant.

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Mercury Magnetic Commutator

In sampling a number of low level circuits in sequence, a low noise commutator having low contact resistance is desirable. A pool of mercury receiving individual projectable contacts provides the required low noise and contact resistance without excessive force. If the contacts are made movable by a magnetic force, such a commutator is smooth acting and wear resistant.

A common pool 1 of mercury is held in a casing 2 which has a number of openings 3 small enough to retain the mercury against leakage. A contact and wire 4 electrically connect to pool 1. A plunger 5 is slidable in each opening 3 to contact the mercury and complete a circuit from the apparatus connected to a plunger 5 by the lead 6. The plungers 5 are connected together by a non- conductive band 7 which passes over projections 8 formed on the casing 2 between plungers 5. Band 7 has sufficient slack to enable only one of the plungers 5 to enter into pool 1. Movement of one plunger into the pool withdraws any other plunger 5.

The plungers 5 are preferentially brought into the mercury pool 1 by a rotating magnet 9 which acts on the plunger 5 or on a magnetic part attached to the plunger.

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