Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1990-01-22
1994-05-03
Logan, Sharon D.
Electrical transmission or interconnection systems
Switching systems
Switch actuation
307141, 3071414, 200 38R, 200 38B, H01H 326, H01H 334, H01H 700, H01H 708
Patent
active
053090322
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.
REFERENCES:
patent: 3555214 (1971-01-01), Lee et al.
patent: 3740680 (1973-06-01), Schneidinger
patent: 3973251 (1976-08-01), Stephas
patent: 4001527 (1977-01-01), Hulshizer
patent: 4171471 (1979-10-01), Boyles
patent: 4259618 (1981-03-01), Nilssen
patent: 4302639 (1981-11-01), Lewis et al.
LandOfFree
Wall switch timer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wall switch timer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wall switch timer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2116771