DIALING CIRCUIT

DIALING CIRCUIT

PURPOSE:To effectively prevent a spark and an arc in case when a dial contact is opened and closed, by intermitting a DC loop current by a contactless switching circuit, intermitting a control current of the contactless switching circuit by a mechanical dial contact, and sending out a dial pulse. CO...

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Hauptverfasser: KURIYAMA MEIKAI, NAKAGAWA MASAKAZU
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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creator KURIYAMA MEIKAI
NAKAGAWA MASAKAZU
description PURPOSE:To effectively prevent a spark and an arc in case when a dial contact is opened and closed, by intermitting a DC loop current by a contactless switching circuit, intermitting a control current of the contactless switching circuit by a mechanical dial contact, and sending out a dial pulse. CONSTITUTION:When a dial is free-moved, a dial impulse contact 1 repeats its opening and closing by the number of the dial numerals, and simultaneously the second switching circuit 8 repeats turn-on and turn-off, therefore, a dial pulse is sent out to a switchboard by intermitting a DC loop current. In this case, a dial short contact 2 is closed in the course of dialing, is opened when dialing ends, turns off the circuit 8, and releases the short circuit of a calling circuit 4. Subsequently, when the contact 2 is opened, a signal current is all supplied to the first switching circuit 7 through the dial impulse contact 1, therefore, the circuit 7 is turned on, and a DC current flows to the circuit 4, by which a call can be executed.
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CONSTITUTION:When a dial is free-moved, a dial impulse contact 1 repeats its opening and closing by the number of the dial numerals, and simultaneously the second switching circuit 8 repeats turn-on and turn-off, therefore, a dial pulse is sent out to a switchboard by intermitting a DC loop current. In this case, a dial short contact 2 is closed in the course of dialing, is opened when dialing ends, turns off the circuit 8, and releases the short circuit of a calling circuit 4. Subsequently, when the contact 2 is opened, a signal current is all supplied to the first switching circuit 7 through the dial impulse contact 1, therefore, the circuit 7 is turned on, and a DC current flows to the circuit 4, by which a call can be executed.</description><language>eng</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; TELEPHONIC COMMUNICATION</subject><creationdate>1983</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19830523&amp;DB=EPODOC&amp;CC=JP&amp;NR=S5885659A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76290</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19830523&amp;DB=EPODOC&amp;CC=JP&amp;NR=S5885659A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>KURIYAMA MEIKAI</creatorcontrib><creatorcontrib>NAKAGAWA MASAKAZU</creatorcontrib><title>DIALING CIRCUIT</title><description>PURPOSE:To effectively prevent a spark and an arc in case when a dial contact is opened and closed, by intermitting a DC loop current by a contactless switching circuit, intermitting a control current of the contactless switching circuit by a mechanical dial contact, and sending out a dial pulse. 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CONSTITUTION:When a dial is free-moved, a dial impulse contact 1 repeats its opening and closing by the number of the dial numerals, and simultaneously the second switching circuit 8 repeats turn-on and turn-off, therefore, a dial pulse is sent out to a switchboard by intermitting a DC loop current. In this case, a dial short contact 2 is closed in the course of dialing, is opened when dialing ends, turns off the circuit 8, and releases the short circuit of a calling circuit 4. Subsequently, when the contact 2 is opened, a signal current is all supplied to the first switching circuit 7 through the dial impulse contact 1, therefore, the circuit 7 is turned on, and a DC current flows to the circuit 4, by which a call can be executed.</abstract><oa>free_for_read</oa></addata></record>
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
title DIALING CIRCUIT
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