JPS57121360A - Two-wire interphone - Google Patents

Two-wire interphone

Info

Publication number
JPS57121360A
JPS57121360A JP665181A JP665181A JPS57121360A JP S57121360 A JPS57121360 A JP S57121360A JP 665181 A JP665181 A JP 665181A JP 665181 A JP665181 A JP 665181A JP S57121360 A JPS57121360 A JP S57121360A
Authority
JP
Japan
Prior art keywords
switch
equipment
diode
terminal
switched
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.)
Granted
Application number
JP665181A
Other languages
Japanese (ja)
Other versions
JPS6147023B2 (en
Inventor
Michiyoshi Tomoe
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.)
Maspro Denkoh Corp
Original Assignee
Maspro Denkoh Corp
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 Maspro Denkoh Corp filed Critical Maspro Denkoh Corp
Priority to JP665181A priority Critical patent/JPS57121360A/en
Publication of JPS57121360A publication Critical patent/JPS57121360A/en
Publication of JPS6147023B2 publication Critical patent/JPS6147023B2/ja
Granted 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE:To neutralize interphones to facilitate the connection of each interphone, by connecting interphones, which speak with each other, through a diode bridge. CONSTITUTION:At a waiting time, a call switch 10 of the first equipment 1 is switched to the waiting side. Then, though a low voltage of a terminal 8 is applied to a Zener diode 32 of a switch circuit 31, this diode 32 is not conductive because the voltage is low. Next, in case that the first equipment 1 calls the second equipment 2, the switch 10 is switched to the call side. Then, a high voltage from a terminal 8 is applied to the diode 32, and the diode 32 becomes conductive to sound a ringer 37, and the switch 10 is switched to the waiting side, and the first and the second equipments 1 and 2 speak with each other. In case that the second equipment 2 calls the first equipment 1, a call switch 30 of the second equipment 2 is closed. Then, the low voltage from the terminal 8 is applied to a coil 17 through a terminal 29a, the switch 30, and terminals 29b and 28a, and a switch 16 is closed to sound a ringer 22.
JP665181A 1981-01-20 1981-01-20 Two-wire interphone Granted JPS57121360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP665181A JPS57121360A (en) 1981-01-20 1981-01-20 Two-wire interphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP665181A JPS57121360A (en) 1981-01-20 1981-01-20 Two-wire interphone

Publications (2)

Publication Number Publication Date
JPS57121360A true JPS57121360A (en) 1982-07-28
JPS6147023B2 JPS6147023B2 (en) 1986-10-17

Family

ID=11644277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP665181A Granted JPS57121360A (en) 1981-01-20 1981-01-20 Two-wire interphone

Country Status (1)

Country Link
JP (1) JPS57121360A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8720299B2 (en) 2010-06-29 2014-05-13 Kubota Corporation Tiltable steering wheel apparatus for work vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8720299B2 (en) 2010-06-29 2014-05-13 Kubota Corporation Tiltable steering wheel apparatus for work vehicle

Also Published As

Publication number Publication date
JPS6147023B2 (en) 1986-10-17

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