US2586838A - Testing circuits for group selectors in automatic systems - Google Patents

Testing circuits for group selectors in automatic systems Download PDF

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Publication number
US2586838A
US2586838A US742574A US74257447A US2586838A US 2586838 A US2586838 A US 2586838A US 742574 A US742574 A US 742574A US 74257447 A US74257447 A US 74257447A US 2586838 A US2586838 A US 2586838A
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United States
Prior art keywords
test
brush
interrupter
relay
terminal
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
US742574A
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English (en)
Inventor
Mamor Armand
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2586838A publication Critical patent/US2586838A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Definitions

  • the present invention relates to a test circuit for automatic telephone selectors or similar systems for establishing connections, in which the testing of contacts takes place over a separate test brush.
  • Such a failure may result in the loss of a call and/or in a hang-up of the circuits involved.
  • the present invention overcomes these disadvantages because the operating circuit of the test relay includes an interrupter segment, the contact making portions of which are grounded for at least part of the time when the test terminals are engaged by the test brush.
  • FIG. 1 is a circuit diagram of an embodiment
  • Fig. 2 is a chart of the engagement times of the interrupter segment and the test terminals.
  • the operating circuit of test relay l is controlled via an interrupter segment 2 arranged so that at the beginning of the time during which a test terminal 3 of a trunk line engages testing brush 4 wiper 5 grounds interrupter segment 2.
  • the amount of time during which wiper 5 and terminal 3 are simultaneously engaged may vary but is preferably slightly less than half the total engagement time between terminal 3 and brush 4.
  • Test relay I may, therefore, operate only during period A (battery, terminal 3, brush 4, high resistance winding relay l, interrupter 2, wiper 5, ground).
  • a late test is not only avoided, but the number of double tests is also considerably reduced. The majority of such double tests are due to the fact that two or more brushes pass over an outlet just becoming free.
  • This kind of double test can at present happen during the full length of the closure of the test brush. By reducing the testing period itself, the number of double tests is reduced in the same proportion.
  • a test relay in which a plurality of test terminals are engaged selectively by a test brush, and in which the selector is also provided with an interrupter operated thereby, the combination comprising a test relay, an operating circuit for said relay jointly controlled by said test brush and said interrupter and effective to initiate the operation of said test relay only while said test brush engages a selected terminal and the interrupter is closed, a locking circuit for said test relay including said test brush and selected terminal, said locking circuit having less resistance than said operating circuit and being in shunt with said interrupter, means controlled by said test relay for closing said locking circuit, whereby the current through said test brush and selected terminal is increased when said locking circuit is closed, and means also controlled by said test relay for stopping the operation of said selector.
  • test relay has a high resistance winding and a low resistance winding connected together and a grounded armature with a front contact
  • the operating circuit jointly controlled by the test brush and the interrupter including said high resistance winding
  • the locking circuit including the low resistance winding and said front contact

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US742574A 1946-01-30 1947-04-19 Testing circuits for group selectors in automatic systems Expired - Lifetime US2586838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL270407X 1946-01-30

Publications (1)

Publication Number Publication Date
US2586838A true US2586838A (en) 1952-02-26

Family

ID=19781905

Family Applications (1)

Application Number Title Priority Date Filing Date
US742574A Expired - Lifetime US2586838A (en) 1946-01-30 1947-04-19 Testing circuits for group selectors in automatic systems

Country Status (5)

Country Link
US (1) US2586838A (en(2012))
BE (1) BE480589A (en(2012))
CH (1) CH270407A (en(2012))
FR (1) FR951247A (en(2012))
NL (1) NL67643C (en(2012))

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1123340A (en) * 1913-08-21 1915-01-05 Western Electric Co Telephone-exchange system.
US1617405A (en) * 1923-12-08 1927-02-15 Western Electric Co Testing system for automatic telephone switches

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1123340A (en) * 1913-08-21 1915-01-05 Western Electric Co Telephone-exchange system.
US1617405A (en) * 1923-12-08 1927-02-15 Western Electric Co Testing system for automatic telephone switches

Also Published As

Publication number Publication date
BE480589A (en(2012))
NL67643C (en(2012))
CH270407A (fr) 1950-08-31
FR951247A (fr) 1949-10-19

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