Electricity: circuit makers and breakers – Liquid contact – Particular conductive liquid
Patent
1977-05-03
1978-09-12
Stearns, Richard R.
Electricity: circuit makers and breakers
Liquid contact
Particular conductive liquid
200236, 335 58, H01H 108, H01H 126
Patent
active
041140060
ABSTRACT:
The possibility of contact bounce in an electrical switch is minimized by transferring energy from an armature of the switch to a damping liquid. An arrangement for damping the armature by such a transfer is particularly suited for use with a mercury-wetted sealed contact switch. The switch includes first and second spaced terminals embedded at opposite ends of a cylindrical envelope. The armature is located in the space between the two terminals. It is hinged by a thin leaf spring at the first terminal and is normally positioned to form a gap with the second terminal. Operation of the switch to close and reopen the gap results from an application and a removal, respectively, of a magnetic field through the terminals and the armature. Mercury wets the contact points between the second terminal and the armature. The mercury is supplied from a pool located at the first terminal. To dampen the motion of the armature, a damping member is rigidly coupled to the armature and extends from the armature into the pool of mercury.
REFERENCES:
patent: 2406036 (1946-08-01), Pollard, Jr.
patent: 2445406 (1948-07-01), Pollard, Jr.
patent: 2732459 (1956-01-01), Pollard, Jr.
patent: 2914634 (1959-11-01), Koda
Schellin W. O.
Stearns Richard R.
Western Electric Co. Inc.
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