Pneumatically operating delay switches

Details Pneumatically operating delay switches Pneumatically operating delay switches

1978-12-26

1981-10-27

Truhe, J. V.

Electricity: circuit makers and breakers

Retarded

Dashpot

200 82R, 267114, H01H 703

Patent

active

042975441

ABSTRACT:
A delay switch working pneumatically includes a piston and cylinder arrangement with the cylinder compartment being in communication with the outside air through a non-return valve and a throttle bore connected in parallel. The switch contacts include a contact spring connected to the piston and a portion of the inner cylinder wall which is made at least partially conducting. The piston is connected to an axially directed actuating pin through a first compression spring and is supported in the cylinder by a second compression spring which is weaker than the first compression spring. The cylinder may include a metallic sleeve which forms one switch connection and which has an insulating insert which the compact arrangement of a contact spring engages in the off state. In this arrangement, a second switch connection is electrically connected with the contact spring by way of the second compression spring.

REFERENCES:
patent: 1059013 (1913-04-01), Urquhart
patent: 2794868 (1957-06-01), McMorran
patent: 3375335 (1968-03-01), Schultz

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