GB867342A - Improvements in or relating to telephone instruments - Google Patents

Improvements in or relating to telephone instruments

Info

Publication number
GB867342A
GB867342A GB63459A GB63459A GB867342A GB 867342 A GB867342 A GB 867342A GB 63459 A GB63459 A GB 63459A GB 63459 A GB63459 A GB 63459A GB 867342 A GB867342 A GB 867342A
Authority
GB
United Kingdom
Prior art keywords
loud
microphone
speaker
plunger
contact
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
GB63459A
Inventor
Albert Edward Judson
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
Original Assignee
General Electric Co PLC
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 filed Critical General Electric Co PLC
Priority to GB63459A priority Critical patent/GB867342A/en
Publication of GB867342A publication Critical patent/GB867342A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets

Landscapes

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

Abstract

867,342. Loud-speaker sets. GENERAL ELECTRIC CO. Ltd. Jan. 5, 1960 [Jan. 7, 1959], No. 634/59. Class 40 (4). In a one-to-one telephone intercommunication system using at one station a conventional cradle-type telephone set and at the other station a telephone instrument which comprises a carbon granule microphone and a loudspeaker mounted behind two apertures in the instrument housing, a spring restored plunger supported by the housing, has two electrical contacts connected to it for operating a calling circuit, and itself supports the microphone so that the carbon granules within the microphone are agitated upon operating the plunger. The housing 3 (Fig. 2), in the form of a short hollow cylinder is closed at the bottom by a plate 8 magnetically attached by a metal clip 10 to the permanent magnet 11 of the loud-speaker 2. The plunger button 6, mounted above and so as to cover the loud-speaker aperture 9 has a conical portion 16 which serves to deflect sound waves from the loud-speaker and is supported on a hollow cylindrical member 19 by three pillars 20. Lips 25, 26 on member 19 rest on a partly compressed coiled spring 24, which serves as the restoring device for plunger button 6, lip 26 also carrying a contact 4 and supporting a microphone 1. Another contact 5 is fixed to an insulated annular plate 22 which also carries electric terminals 27 (Fig. 3), for connecting two pairs of leads to the microphone and the loud-speaker, one of the wires in each pair going to a common terminal and to contact 4 and another wire going to fixed contact 5. The microphone and the loud-speaker are connected over separate two-wire circuits to the receiver and transmitter of the conventional set. A battery has one terminal connected to the common wire and the other terminal connected directly to the calling device and also to the transmitter and receiver of the conventional set by way of its cradle switch contacts. It is thus arranged that the calling device operates when contacts 4, 5 are brought together by plunger button 6 and that both two wire circuits are completed when the handset is raised, this operation also lighting a lamp 28 in the telephone instrument through a further calling circuit.
GB63459A 1959-01-07 1959-01-07 Improvements in or relating to telephone instruments Expired GB867342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB63459A GB867342A (en) 1959-01-07 1959-01-07 Improvements in or relating to telephone instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB63459A GB867342A (en) 1959-01-07 1959-01-07 Improvements in or relating to telephone instruments

Publications (1)

Publication Number Publication Date
GB867342A true GB867342A (en) 1961-05-03

Family

ID=9707792

Family Applications (1)

Application Number Title Priority Date Filing Date
GB63459A Expired GB867342A (en) 1959-01-07 1959-01-07 Improvements in or relating to telephone instruments

Country Status (1)

Country Link
GB (1) GB867342A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8860573B2 (en) 2006-03-06 2014-10-14 Fireangel Limited Alarm system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8860573B2 (en) 2006-03-06 2014-10-14 Fireangel Limited Alarm system
EP1991969B1 (en) * 2006-03-06 2015-01-21 Fireangel Limited Alarm system

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