Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1984-05-18
1985-12-17
Scott, J. R.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 65, 307 86, 307115, 307142, 200 5B, 200 18, 200 52R, 30DIG1, H02J 906
Patent
active
045594562
ABSTRACT:
A portable type electric appliance powered by incorporated main and reserve batteries. The batteries are connected to an electric load selectively by means of a switching device including a main switch for connecting the main battery to the load and a subsidiary switch for connecting the reserve battery to the load. A lock locks the subsidiary switch in a disconnected position until the main switch is closed. Namely, the subsidiary switch can be closed only after the main switch is closed. Therefore, the main battery is always used prior to the reserve battery, and when the main battery is exhausted, the reserve battery remaining unexhausted is capable of taking over to operate the appliance without requiring immediate replacement of the main battery. Accordingly, the accidental interruption of the operation of the appliance can be avoided.
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Shirakawa Kenzo
Tanimizu Makoto
Wataya Hideji
Yamamoto Shigeo
Jennings Derek S.
Matsushita Electric & Works Ltd.
Scott J. R.
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