Electrical transmission or interconnection systems – Miscellaneous systems – Power packs
Patent
1993-12-02
1995-03-14
Logan, Sharon D.
Electrical transmission or interconnection systems
Miscellaneous systems
Power packs
307140, 3071414, 200 38R, 200 38B, 200 38D, 315360, H02J 700, H05B 3702, H01H 708
Patent
active
053979303
ABSTRACT:
A plug-in timer has a set of input terminals and a set of output terminals as well as a contactor operable to make and/or break electrical connection between these sets of terminals in accordance with a pre-setable 24 hour program. The timer is powered from a small built-in battery, and comprises its own quartz clock and programming-and-control means. The contactor is actuated by a miniature DC motor through a gear and cam arrangement. The operation of the DC motor is controlled by the programming-and-control means, which provides power from the battery to the motor in accordance with a pre-set program; which pre-set program may be modified at any time by way of a keyboard and a numeric display means.
The contactor operates by way of hard metal contacts and very little power dissipation occurs within the timer. The timer can be plugged into a special wall switch receptacle and then operates to programmably control the flow of power to the load controlled by this wall switch.
Since the timer has its own built-in source of energy and clock, its operation is totally independent of the power line, and it will therefore not be affected by a power failure. With a usage rate of two CONNECT-actuations and two DISCONNECT-actuations per day, plus occasional over-rides, the battery will last for years before needing replacement.
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patent: 3889132 (1975-06-01), Vreeland
patent: 3925629 (1975-12-01), Albinger, Jr.
patent: 3973251 (1976-08-01), Stephas
patent: 4001527 (1977-01-01), Hulshizer
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patent: 4259618 (1981-03-01), Nilssen
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patent: 4360739 (1982-11-01), Goldstein
patent: 4484040 (1984-11-01), Wasle
patent: 4570216 (1986-02-01), Chan
Auger et al (Auger), "Latching Relays", The Relay Guide, Reinhold Publishing Corp., 1960, pp. 209-211.
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