GB749111A - Improvements in or relating to telephone handsets - Google Patents

Improvements in or relating to telephone handsets

Info

Publication number
GB749111A
GB749111A GB2334952A GB2334952A GB749111A GB 749111 A GB749111 A GB 749111A GB 2334952 A GB2334952 A GB 2334952A GB 2334952 A GB2334952 A GB 2334952A GB 749111 A GB749111 A GB 749111A
Authority
GB
United Kingdom
Prior art keywords
mouthpiece
microphone
sound
telephone
diaphragm
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
GB2334952A
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.)
Individual
Original Assignee
Individual
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
Priority to FR65760D priority Critical patent/FR65760E/fr
Priority to NL86709D priority patent/NL86709C/xx
Priority to NLAANVRAGE7804515,B priority patent/NL172527B/en
Priority to DEJ858A priority patent/DE888115C/en
Priority to DEI4626A priority patent/DE910064C/en
Priority to DEI4625A priority patent/DE910063C/en
Priority to US309848A priority patent/US2754377A/en
Application filed by Individual filed Critical Individual
Priority to FR1063396D priority patent/FR1063396A/en
Priority to GB2334952A priority patent/GB749111A/en
Priority to DEJ6708A priority patent/DE930268C/en
Priority to GB16167/53A priority patent/GB751009A/en
Publication of GB749111A publication Critical patent/GB749111A/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
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • 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
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Landscapes

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

Abstract

749,111. Mouthpieces. JUNGHANS, H. Sept. 17, 1952, No. 23349/52. Class 40 (4). A telephone mouthpiece which encloses the mouth in a sound-tight manner to prevent overhearing by persons in the vicinity of the speaker is provided with respiration valves. An attachment for a telephone handset, Fig. 1, comprises a cylindrical casing 2, coupled to the telephone transmitter 1b by a rubber sleeve 3 on a knee-piece 2a. The cylindrical body 4 of the mouthpiece is held in the casing 2 by felt rings 5 and 6 and plate valves 8 and 14 permit expiration and inhalation. Sound from the speaker is directed by an inclined surface 4b to the microphone of the handset through a hole 4e and a diaphragm 7 of sound-permeable but moisture-tight material, and sound passing through the exhalation valve is absorbed in a labyrinth 4i surrounding a glass wool sound filter 10. A replaceable pulp insert 12, Fig. 2, is provided for hygienic purposes. In Fig. 3, a casing 106 containing a microphone 115 and incorporating a belled mouthpiece and respiration valves is coupled to the handle of a receiver by a crank-handled lever arrangement 104 for adjusting the relative positions of the mouthpiece and earpiece. The microphone is protected by a moisture-proof diaphragm 117 which is connected by a stud 119 to the diaphragm of the microphone and air is led from the expiration valve 110 through a channel 111 to a filter chamber of the kind used in the previous embodiment. Alternative lever and ratchet arrangements for adjusting the mouthpiece relative to the earpiece are described with reference to Figs. 6-8 and 11-14 (not shown), and earpieces adjustable relative to the handle are described with reference to Figs. 7, 9 and 10 (not shown). An alternative filter chamber arrangement comprising a stack of plates bored with holes out of correspondence is also described with reference to Figs. 15 and 16 (not .shown). The use of a microphone enclosed as described and having a mouthpiece according to the invention as an addition to the normal handset on a telephone set is referred to.
GB2334952A 1950-05-03 1952-09-17 Improvements in or relating to telephone handsets Expired GB749111A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
FR65760D FR65760E (en) 1952-09-17
NL86709D NL86709C (en) 1952-09-17
NLAANVRAGE7804515,B NL172527B (en) 1952-09-17 AIR TIRE, PARTICULARLY INTENDED FOR HEAVY VEHICLES WHICH RUN BOTH ON AND OUTSIDE Paved Roads.
DEJ858A DE888115C (en) 1950-05-03 1950-05-03 Device for the voice-over of telephone sets to prevent eavesdropping
DEI4625A DE910063C (en) 1951-09-18 1951-09-18 Device for the voice-over of telephone sets to prevent eavesdropping
DEI4626A DE910064C (en) 1951-09-18 1951-09-18 Device for the voice-over of telephone sets to prevent eavesdropping
US309848A US2754377A (en) 1952-09-17 1952-09-16 Device for prevention of overhearing of telephone conversations
FR1063396D FR1063396A (en) 1952-09-17 1952-09-17 Device for preventing a third party from hearing a telephone conversation
GB2334952A GB749111A (en) 1952-09-17 1952-09-17 Improvements in or relating to telephone handsets
DEJ6708A DE930268C (en) 1952-09-17 1952-12-14 Device for the voice-over of telephone sets to prevent eavesdropping
GB16167/53A GB751009A (en) 1952-09-17 1953-06-11 Improvements in or relating to telephone handsets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2334952A GB749111A (en) 1952-09-17 1952-09-17 Improvements in or relating to telephone handsets

Publications (1)

Publication Number Publication Date
GB749111A true GB749111A (en) 1956-05-16

Family

ID=10194218

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2334952A Expired GB749111A (en) 1950-05-03 1952-09-17 Improvements in or relating to telephone handsets

Country Status (1)

Country Link
GB (1) GB749111A (en)

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