GB995102A - Improvements in or relating to electric impulse transmitters and to telephone station apparatus incorporating electric impulse transmitters - Google Patents

Improvements in or relating to electric impulse transmitters and to telephone station apparatus incorporating electric impulse transmitters

Info

Publication number
GB995102A
GB995102A GB3995462A GB3995462A GB995102A GB 995102 A GB995102 A GB 995102A GB 3995462 A GB3995462 A GB 3995462A GB 3995462 A GB3995462 A GB 3995462A GB 995102 A GB995102 A GB 995102A
Authority
GB
United Kingdom
Prior art keywords
cam
digit
dialled
springs
normal
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
GB3995462A
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.)
General Electric Co PLC
Associated Automation Ltd
Original Assignee
General Electric Co PLC
Associated Automation 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 General Electric Co PLC, Associated Automation Ltd filed Critical General Electric Co PLC
Priority to GB3995462A priority Critical patent/GB995102A/en
Publication of GB995102A publication Critical patent/GB995102A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

995,102. Telephone dials. ASSOCIATED AUTOMATION Ltd., GENERAL ELECTRIC CO. Ltd., A. YOUNG, and J. H. LEWORTHY. Jan. 15, 1964 [Oct. 22, 1962], No. 39954/62. Heading H4K. In a dial preferably of the kind described in Specification 518,721, auxiliary springs 6 which are normally closed are controlled by cams 14, 15 loose on the shaft 2 of the finger plate 3 in such a way that they open when the digit 0 is dialled provided it does not follow a digit other than 0. When 0 is dialled, an arm 26 on the shaft 2 rotates sufficiently to engage a pin 25 on the cam 14 and move it off-normal, in which position it remains until the arm 26 again strikes the pin 25 at the end of the return movement. A cam follower 27 allows the springs 6 to open. The cam 15 has two off-normal positions to which it is moved by successive settings of the finger plate 3 through a cranked lever 34 and pawl 32, there being a retaining detent 30. If the first digit dialled is 0, however, the movement of the cam 14 withdraws the detent 30 and allows the cam 15 to return to normal. But if the digit 0 follows another digit, the cam 15 goes to the second off-normal position, and it is no longer released by the cam 14. In this position it prevents the control of the cam follower 17 by the cam 14. A further cam 16 has a projection 40 coupled to the cradle switch so that the cam moves through a small angle when the handset is removed or replaced, and thus releases both the pawl 32 and detent 30, allowing the cam 15 to restore. By giving the cam 14 a second pin it may be arranged to control the springs 6 when either 9 and 0 is dialled. The circuit shown in Fig. 6 is intended for a system in which the first digit 0 indicates a trunk call, while the number 000 is used for emergency calls. When O is dialled as the first digit springs 6 open as described above and relay A energizes. On the return of springs 6 the impulse springs 1 are short-circuited unless 0 is again dialled or unless contacts 41 forming part of a keyoperated lock are opened.
GB3995462A 1962-10-22 1962-10-22 Improvements in or relating to electric impulse transmitters and to telephone station apparatus incorporating electric impulse transmitters Expired GB995102A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3995462A GB995102A (en) 1962-10-22 1962-10-22 Improvements in or relating to electric impulse transmitters and to telephone station apparatus incorporating electric impulse transmitters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3995462A GB995102A (en) 1962-10-22 1962-10-22 Improvements in or relating to electric impulse transmitters and to telephone station apparatus incorporating electric impulse transmitters

Publications (1)

Publication Number Publication Date
GB995102A true GB995102A (en) 1965-06-16

Family

ID=10412406

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3995462A Expired GB995102A (en) 1962-10-22 1962-10-22 Improvements in or relating to electric impulse transmitters and to telephone station apparatus incorporating electric impulse transmitters

Country Status (1)

Country Link
GB (1) GB995102A (en)

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