GB925745A - Improved portable telephone instrument - Google Patents

Improved portable telephone instrument

Info

Publication number
GB925745A
GB925745A GB2971760A GB2971760A GB925745A GB 925745 A GB925745 A GB 925745A GB 2971760 A GB2971760 A GB 2971760A GB 2971760 A GB2971760 A GB 2971760A GB 925745 A GB925745 A GB 925745A
Authority
GB
United Kingdom
Prior art keywords
casing
instrument
cover
portable telephone
transmitter
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
GB2971760A
Inventor
Arne Huse
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
Priority to GB2971760A priority Critical patent/GB925745A/en
Publication of GB925745A publication Critical patent/GB925745A/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
    • H04M1/02—Constructional features of telephone sets
    • H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment

Landscapes

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

Abstract

925,745. Sets. TELEFONAKTIEBOLAGET L. M. ERICSSON. Aug. 29, 1960, No. 29717/60. Class 40 (4). In a portable telephone instrument in which V.F. signals fed to the transmitter or receiver act as the ringing signal, a resonant cavity is formed between the transmitter or receiver and the associated part of the instrument casing and another resonant circuit is formed by arranging that the volume enclosed by a cover for the instrument is matched to a slot formed between the cover and the casing. The instrument also contains means (unspecified) for converting normal ringing current into a V.F. signal. The overall amplification using these resonant circuits is stated to be 17 db. In Fig. 1, the resonant cavity is shown at 3, sound outlet from the cavity being through gaps 21 between spacing pillars 22 (only two shown). A hook switch arm 6 passing through watertight bellows 10 serves to restrain the handset on its stand. The cover 11 (Fig. 2) may be spaced from the casing 12 so as to provide a resonating slot 14 or by hooking button 20 through a second higher hole in metal plate 17, a watertight joint between cover and casing can be made (Fig. 3, not shown).
GB2971760A 1960-08-29 1960-08-29 Improved portable telephone instrument Expired GB925745A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2971760A GB925745A (en) 1960-08-29 1960-08-29 Improved portable telephone instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2971760A GB925745A (en) 1960-08-29 1960-08-29 Improved portable telephone instrument

Publications (1)

Publication Number Publication Date
GB925745A true GB925745A (en) 1963-05-08

Family

ID=10295995

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2971760A Expired GB925745A (en) 1960-08-29 1960-08-29 Improved portable telephone instrument

Country Status (1)

Country Link
GB (1) GB925745A (en)

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