Arrangement of automatically restoring normal operation of latch

Details Arrangement of automatically restoring normal operation of latch Arrangement of automatically restoring normal operation of latch

1990-07-30

1993-03-23

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Switching systems

Repetitive make and break

361153, 361186, H01H 4700

Patent

active

051967308

ABSTRACT:
In order to automatically restore a normal switching position of a relay armature from an accidental OFF switching induced by external impact or the like, the output of the relay is monitored and is applied to a differentiating circuit. A comparator is provided to reflect on and off operations of a main switch. In the event that the output of the relay falls suddenly, the differentiating circuit outputs a pulse to a wave-shaping circuit (e.g., Schmitt trigger). A gate circuit is supplied with the outputs of the wave-shaping circuit and the comparator. The output of the gate circuit momentarily allows a relay driver to actuate the relay in response to the undesired change in relay status, and hence the relay armature resumes ON switching position.

REFERENCES:
patent: 4455587 (1984-06-01), Pothof et al.
patent: 4661766 (1987-04-01), Hoffman et al.
patent: 4907122 (1990-03-01), Tamura
patent: 4914315 (1990-04-01), Nickolai

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