Detachable cord

Details Detachable cord Detachable cord

1981-04-27

1982-08-17

Shepperd, John W.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

H01H 920

Patent

active

043451225

ABSTRACT:
There is disclosed an electric cord mechanical interlock system which prevents the user from removing or inserting the cord of an electric appliance when the appliance is switched on thus preventing arcing across the contacts. Arcing is prevented by providing an extension as part of the on-off switch control which, when the switch is off, engages and raises a flexible arm containing a pin, allowing the plug to be inserted or removed.

REFERENCES:
patent: 621860 (1899-03-01), Shork
patent: 1612711 (1926-12-01), Erikson
patent: 1924691 (1933-08-01), Lofgren
patent: 2015543 (1935-09-01), Bissell

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