GB334257A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB334257A
GB334257A GB1686329A GB1686329A GB334257A GB 334257 A GB334257 A GB 334257A GB 1686329 A GB1686329 A GB 1686329A GB 1686329 A GB1686329 A GB 1686329A GB 334257 A GB334257 A GB 334257A
Authority
GB
United Kingdom
Prior art keywords
relay
magnet
circuit
selector
switch
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
Application number
GB1686329A
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.)
Automatic Telephone Manufacturing Co Ltd
Original Assignee
Automatic Telephone Manufacturing Co Ltd
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 Automatic Telephone Manufacturing Co Ltd filed Critical Automatic Telephone Manufacturing Co Ltd
Priority to GB1686329A priority Critical patent/GB334257A/en
Publication of GB334257A publication Critical patent/GB334257A/en
Expired legal-status Critical Current

Links

Classifications

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

334,257. Automatic Telephone Manufacturing Co., Ltd., Gillings, C., and Paulett, W. H. May 31, 1929. Automatic exchange systems. - In a hunting type switch in which hunting is controlled by the interaction of a magnet and an interrupter relay, the interrupter relay is held operated in series with the test relay when a free circuit has been reached until the test relay has opened another point in the circuit of the stepping magnet. The invention is described as applied to a bi-directional call finder with two sets of wipers, only one set being used at a time, which is directly connected to a selector switch. Specification 334,218 is referred to. When a call is made LR operates replacing the normal earth on the wiper P by battery through CO and operating the start relay A. The calling level is marked in the bank wiped by VW. D operates to connect up the upper wiper set and relays A and B of the selector pull up to guard the line. Magnet V energizes to step the switch one vertical step and relay G pulls up over contacts V. Relay G and magnet V inter-act until the level required is reached when G remains operated in series with T to earth over the test wiper. Relay T locks.up, breaking the circuit of V, releasing G and changing over to the rotary magnet R. Relay G and magnet R then inter-act until the calling line is found when G holds up in series with H. Relay H locks to the test conductor, breads the driving magnet circuit, and switches the speaking circuit through. The first digit train is repeated by A to the vertical magnet of the selector and the switch steps to the required level. When C falls back at the end of the train magnet R operates and relay G and magnet R interact stepping the wipers until a free circuit is reached when G remains operated, in series with switching relay H. to battery over the test wire. If the finder fails to find the calling line, the finder cam springs S operate on the eleventh rotary step locking up G and H. Relay T releases and G and H fall away releasing the switch. If the selector fails to find a free outlet, the selector cam springs S operate and busy tone is returned to the calling line.
GB1686329A 1929-05-31 1929-05-31 Improvements in or relating to telephone systems Expired GB334257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1686329A GB334257A (en) 1929-05-31 1929-05-31 Improvements in or relating to telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1686329A GB334257A (en) 1929-05-31 1929-05-31 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB334257A true GB334257A (en) 1930-09-01

Family

ID=10085044

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1686329A Expired GB334257A (en) 1929-05-31 1929-05-31 Improvements in or relating to telephone systems

Country Status (1)

Country Link
GB (1) GB334257A (en)

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