1975-06-10
1976-12-21
Envall, Jr., R. N.
317DIG8, H01H 4700
Patent
active
039991067
ABSTRACT:
An electrical switch device comprising a bi-stable double-throw switching relay having magnetic or mechanical means for contact holding, and at least one capacitive and/or inductive energy storing component to supply the switching relay with trailing edge trigger. The energy storing component is connected to a first contact of the relay, receives energy while the first contact is selected or reset and while the common contact of the relay is connected to a direct-current power source, and it discharges energy upon disconnecting the common contact from the power source so as to drive the relay, resulting in a second contact being selected. Such a switch device permits only the first pulse to reach the first relay contact after reset. A sequential switch apparatus for a two-wire line, connecting spread loads in either chain or tree wise fashion throughout a given system, may be realized by making use of the present switch devices wherein, for example, an operational sequence of turning on and off of power to the loads at the power source side according to a desired time schedule is required.
REFERENCES:
patent: 3365625 (1968-01-01), Pearse
patent: 3398330 (1968-08-01), Poole
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