US1819683A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US1819683A
US1819683A US460017A US46001730A US1819683A US 1819683 A US1819683 A US 1819683A US 460017 A US460017 A US 460017A US 46001730 A US46001730 A US 46001730A US 1819683 A US1819683 A US 1819683A
Authority
US
United States
Prior art keywords
relay
line
cut
call
contacts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US460017A
Other languages
English (en)
Inventor
Larsson Knut
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US1819683A publication Critical patent/US1819683A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/62—Co-operating movable contacts operated by separate electrical actuating means

Definitions

  • the subscribers lines are usually provided with so called line and cut-ofli relays to control the call circuit and, in certain cases,
  • the present invention has for its object to reduce the cost of manufacture of the line and cut-ofii relays by a reduction in the number of contact springs of said relay. This is brought about according to the invention by that those contact springs of the cut-off relay, which control the circuit extending over the test wire, are adapted to be actuated by the 29 line relay when the latter is energized.
  • Figure 1 shows a known arrangement of the line and cut-oil. relays and the appertaining circuits whereas Figure 2 shows a corresponding arrangement according to the invention.
  • Figure 3 discloses an example of the constructional features.
  • Figure 1 shows a subscribers line of which the two branches a, I) together with the appertaining test wire 0 are connected to fixed contacts alc, bk, 07a in the contact field of a call finder.
  • the line relay LB To the subscribers line belongs the line relay LB, 2. cut-on relay BR and a call meter SM.
  • the line relay LR Upon a call, the line relay LR is energized in known manner over the subscribers line, a call finder being started through the intermedium of the starting relay SR the circuit of which is closed over the contacts 8, 9 of the line relay.
  • the cut-off relay BB is connected to the test wire 0 over contacts 10, 11 of the line relay besides which the call meter SM is disconnected from the test wire 0 at the contacts 12, 18.
  • the call finder finds the calling line a circuit is closed over the test wire 0 and the contacts 10, 11 through the cut-off relay BR which is energized and disconnects the line relay the central battery LR at the contacts 1, 2, 3, 4c.
  • the line'relay LR- is deenergized and opens the circuit of the relay SR.
  • the cut-oil relay BR remains thereupon energized over the contactsf), 6
  • Call'metering may also be brought about in known manner by connecting the wire 0 to the negative pole of the battery, the cutoff relay BR being short-circuited. When the relay BR for this reason is deenergized the call meter SM is connected into circuit to the test wire over the contacts 6, 7 the call meter being then actuated.
  • the circuit arrangement shown in Figure 1 may according to the invention be simplified in a manner shown in Figure 2.
  • the group of contact springs 5, 6, 7 is here so disposed that it may be actuated by both the cut-0E relay BR and the line relayLR.
  • the contact spring group 10, 11, 12, 13 marked in Figure 1 by a dashed and dotted circle becomes superfluous at the same time as the circuits are simplified.
  • the same contact spring couple 5, 6 over which the cutoff relay is connected to the test wire serves namely also to lock the cut-off relay after theline relay LR is dc-energized.
  • only one contact spring couple 6, 7 is required to control the circuit of the call meter SM.
  • the arrangement is the same as in Figure 1 and the operation is also sub stantially the same.
  • Figure 3 shows an example of the disposition of the contact springs of the relays LR and ER.
  • the contact s )ring group 8, 9 and 1, 2, 8, 1 are so dispose that they are actuated only by the relay armatures LA and BA respectively Whereas the contact spring group 5, 6, 7 is disposed between said groups so that it may be actuated by both armatures.
  • a subscribers line, line and cut-ofi' relays connected to said line.
  • a number of cont'acts appertaining to said cutoff relay means to actuatesaidcontacts' by the line relaywhen the latter relay is energized, means 2q to' c'onnect.
  • the cut-off relay to thei test Wire "over contacts Which are actuatedbythe line relay when it is energized, and means to lock sziidbutpfirelaycyer thesame contacts When it islene rgiz ed'o'ver the test wire.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
US460017A 1929-06-21 1930-06-09 Telephone system Expired - Lifetime US1819683A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE356217X 1929-06-21

Publications (1)

Publication Number Publication Date
US1819683A true US1819683A (en) 1931-08-18

Family

ID=20308795

Family Applications (1)

Application Number Title Priority Date Filing Date
US460017A Expired - Lifetime US1819683A (en) 1929-06-21 1930-06-09 Telephone system

Country Status (4)

Country Link
US (1) US1819683A (fr)
DE (1) DE570868C (fr)
FR (1) FR697224A (fr)
GB (1) GB356217A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1100102A3 (fr) * 1999-11-12 2003-07-02 Taiko Device, Ltd. Relais électromagnétique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1100102A3 (fr) * 1999-11-12 2003-07-02 Taiko Device, Ltd. Relais électromagnétique
US6771154B1 (en) 1999-11-12 2004-08-03 Taiko Device, Ltd. Electromagnetic relay

Also Published As

Publication number Publication date
GB356217A (en) 1931-09-04
DE570868C (de) 1933-02-21
FR697224A (fr) 1931-01-13

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