Time delay switching device

Details Time delay switching device Time delay switching device

1983-02-16

1984-10-30

Scott, J. R.

Electricity: circuit makers and breakers

Retarded

Dashpot

335 61, H01H 703, H01H 4300

Patent

active

044801580

ABSTRACT:
A time-delay switching device which includes a pneumatic timer adapted to be triggered by an electromagnet. The switching device includes at least two switches, with each switch including a movable switching element for controlling switching operations in, for example, a wye-delta control circuit. The time delay switching device is constructed in such a fashion that a specified switching pause occurs between an actuation of the two switches and/or an actuation of a second group of switches. One of the switches includes a movable switch element which is influenced immediately after the expiration of a time delay period by the pneumatic timer. A movable switching element of the other switch is coupled with the first switching element by a buffer which is adapted to transmit a switching movement on a delayed basis. The buffer may take the form of a mechanical or pneumatic compression spring.

REFERENCES:
patent: 4179676 (1979-12-01), Selas

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