US2245835A - Telephone instrument - Google Patents

Telephone instrument Download PDF

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Publication number
US2245835A
US2245835A US272951A US27295139A US2245835A US 2245835 A US2245835 A US 2245835A US 272951 A US272951 A US 272951A US 27295139 A US27295139 A US 27295139A US 2245835 A US2245835 A US 2245835A
Authority
US
United States
Prior art keywords
laryngaphone
transmitter
microphone
handset
socket
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 - Lifetime
Application number
US272951A
Other languages
English (en)
Inventor
Stehlik Rudolph Frank
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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 Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Application granted granted Critical
Publication of US2245835A publication Critical patent/US2245835A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • a throat transmitter or so-called laryngaphone in addition to the normal telephone instrument.
  • This has usually been provided as a separate unit which can be strapped around the neck and connected by a cord to the terminals of the instrument which incorporates a switching device permitting the cutting out of the handset transmitter and the switching-in of the laryngaphone.
  • This arrangement has certain disadvantages as if it is necessary to listen as well as to speak, the receiver of the handset must still be held to the ear.
  • the separate unit with straps and cord is awkward to handle and store and under certain conditions the cord and strap are liable to become tangled and .furthermore a switch has to be provided on the instrument and an extra operation is necessary to render the laryngaphone effective.
  • the chief object of the present invention is to provide a neat and compact combined telephone and laryngaphone unit whereby the above difiiculties are avoided.
  • a unit including a receiver and microphone of ordinary type is provided with a socket for the plugging in of a throatoperated microphone.
  • a unit including a receiver and microphone of ordinary type is provided with facilities for plugging in a throat-operated microphone in substitution for the ordinary microphone.
  • Fig. 1 shows the normal handset
  • Fig. 2 shows the plug-in portion comprising the laryngaphone
  • Fig. 3 is a fragmentary view showing the laryngaphoue in plugged-in position and indicating the contact operation produced thereby, while Fig. 4 represents a suitable circuit diagram.
  • the handset comprises the usual receiver I and microphone transmitter 2 Joined by the handle 3 which is split longitudinally and provided with the switching key 4 for connecting up the talking battery.
  • the handle also includes the socket 5 adapted to receive the laryngaphone of Fig. 2. This comprises essentially the member 0 which is pressed against the throat to receive the speech vibrations and the plug portion I which fits into the socket 5 and makes the necessary electrical connections.
  • Fig. 2 comprises the usual receiver I and microphone transmitter 2 Joined by the handle 3 which is split longitudinally and provided with the switching key 4 for connecting up the talking battery.
  • the handle also includes the socket 5 adapted to receive the laryngaphone of Fig. 2. This comprises essentially the member 0 which is pressed against the throat to receive the speech vibrations and the plug portion I which fits into the socket 5 and makes the necessary electrical connections.
  • the plug spring I engages the spring 8 and moves it out of contact with the spring 8 thereby breaking the connection to the ordinary microphone and connecting up the laryngaphone in its place.
  • the complete instrument includes a magneto It with the usual switching springs II and control contacts II, a bell I3, induction coil I4, buzzer l5, signalling key l1, and battery It.
  • the laryngaphone element is conveniently housed in a casing of moulded material but metal or rubber may also be used if found more convenient. Moreover though in the system shown the plugging-in of the unit disconnects the ordinary microphone this is not essential and it might be thought desirable in some cases for both to remain connected up. It will be seen that the pin connections are sufiiciently long and robust for the laryngaphone to be held firmly in position after it has been plugged in. Its rigidity is increased by the fact that it secures a bearing against the projection 2
  • a telephone handset unit having a handle carrying the usual transmitter and receiver thereon, a throat operated microphone having a transmitter on one end and a receiver on the 10 other end, a laryngaphone having a plug extension rigid therewith, a socket in the handle between the transmitter and receiver and adjacent the transmitter, a built out projection on the transmitter adjacent the socket, said projection and said socket cooperating to hold the larynga'phone rigidly supported on the handle above the transmitter when the plug is inserted in the socket.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
US272951A 1938-05-18 1939-05-11 Telephone instrument Expired - Lifetime US2245835A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB219316X 1938-05-18

Publications (1)

Publication Number Publication Date
US2245835A true US2245835A (en) 1941-06-17

Family

ID=10171212

Family Applications (1)

Application Number Title Priority Date Filing Date
US272951A Expired - Lifetime US2245835A (en) 1938-05-18 1939-05-11 Telephone instrument

Country Status (5)

Country Link
US (1) US2245835A (en))
BE (1) BE434077A (en))
CH (1) CH219316A (en))
FR (1) FR854285A (en))
GB (1) GB514905A (en))

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624808A (en) * 1949-03-30 1953-01-06 Nat Pneumatic Co Inc Signaling switch device
US3277243A (en) * 1962-12-19 1966-10-04 Burroughs Corp Telephone adapter
USD282363S (en) 1983-08-12 1986-01-28 International Business Machines Corporation Telephone handset
USD285197S (en) 1983-09-23 1986-08-19 Peter Bressler Handset telephone unit
USD285200S (en) 1983-09-23 1986-08-19 Peter Bressler Handset telephone unit
US4700383A (en) * 1984-07-24 1987-10-13 Fujitsu Limited Lock-releasing mechanism for telephone set with muting function
US20090190781A1 (en) * 2004-02-20 2009-07-30 Mikio Fukuda Bone-conduction handset

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624808A (en) * 1949-03-30 1953-01-06 Nat Pneumatic Co Inc Signaling switch device
US3277243A (en) * 1962-12-19 1966-10-04 Burroughs Corp Telephone adapter
USD282363S (en) 1983-08-12 1986-01-28 International Business Machines Corporation Telephone handset
USD285197S (en) 1983-09-23 1986-08-19 Peter Bressler Handset telephone unit
USD285200S (en) 1983-09-23 1986-08-19 Peter Bressler Handset telephone unit
US4700383A (en) * 1984-07-24 1987-10-13 Fujitsu Limited Lock-releasing mechanism for telephone set with muting function
US20090190781A1 (en) * 2004-02-20 2009-07-30 Mikio Fukuda Bone-conduction handset
US7639825B2 (en) * 2004-02-20 2009-12-29 Temco Japan Co., Ltd. Bone-conduction handset

Also Published As

Publication number Publication date
GB514905A (en) 1939-11-21
FR854285A (fr) 1940-04-09
BE434077A (en))
CH219316A (fr) 1942-01-31

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