Electrical transmission or interconnection systems – Switching systems – Plural switches
Patent
1975-11-06
1977-02-08
Hohauser, Herman
Electrical transmission or interconnection systems
Switching systems
Plural switches
192131R, H01H 4704
Patent
active
040073793
ABSTRACT:
A circuit is provided for apparatus of the type in which a member is reciprocated through a work stroke relative to a support on which work is placed and from which it is removed by the operator. Typical operations are cutting and forming. The circuit includes two parallel leads and a pair of switches in control of both leads, one switch for each hand of the operator. The switches are normally closed with reference to the first lead. The second, normally open lead includes a device which, when energized, initiates the work stroke and the first lead includes means enabling the second lead to be closed relative to the device if the operator actuates both switches but the means of the first lead cannot again be operated unless and until both switches are in their normal position.
REFERENCES:
patent: 2789437 (1957-04-01), Longfield
patent: 3578123 (1971-05-01), Freeland
patent: 3748541 (1972-02-01), Ginsberg
Hohauser Herman
Safety Engineering, Inc.
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