JPS5530272A - Interphone unit - Google Patents
Interphone unitInfo
- Publication number
- JPS5530272A JPS5530272A JP10405978A JP10405978A JPS5530272A JP S5530272 A JPS5530272 A JP S5530272A JP 10405978 A JP10405978 A JP 10405978A JP 10405978 A JP10405978 A JP 10405978A JP S5530272 A JPS5530272 A JP S5530272A
- Authority
- JP
- Japan
- Prior art keywords
- master unit
- calling
- unit
- call
- terminal
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
PURPOSE:To make an automatic connection between a master unit and a terminal by forming a calling channel to the master unit via a latching relay by selectively driving two switching circuits driven by two terminals. CONSTITUTION:When calling switch S2 of 1st subordinate unit 3 is closed, switching transistor T4 of channel selector circuit 2 held in an ON state by a base current from power supply E turns OFF. As a result, a current is flowed through latching relay RRY to change contact RS over to the (r2) side. Further, calling circuit SW1 of the master unit in a stand-by state operates to inform the terminal of the call. Then, the master unit answers via its handset to change switch S1 over to the contact-(b) side, and consequently subordinate unit 3 forms a calling loop to the master unit, so that the call will be possible.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10405978A JPS5952862B2 (en) | 1978-08-25 | 1978-08-25 | intercom device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10405978A JPS5952862B2 (en) | 1978-08-25 | 1978-08-25 | intercom device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5530272A true JPS5530272A (en) | 1980-03-04 |
JPS5952862B2 JPS5952862B2 (en) | 1984-12-21 |
Family
ID=14370605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10405978A Expired JPS5952862B2 (en) | 1978-08-25 | 1978-08-25 | intercom device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5952862B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57178463A (en) * | 1981-04-27 | 1982-11-02 | Shinsei Denki Kogyo Kk | Nurse call system |
JPH0531429U (en) * | 1991-09-25 | 1993-04-23 | アイホン株式会社 | Intercom connection channel selection device |
JP2007055642A (en) * | 2005-08-23 | 2007-03-08 | Sekisui Plastics Co Ltd | Chinese yam transporting and storing container, and chinese yam transporting and storing package using the same |
-
1978
- 1978-08-25 JP JP10405978A patent/JPS5952862B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57178463A (en) * | 1981-04-27 | 1982-11-02 | Shinsei Denki Kogyo Kk | Nurse call system |
JPH0531429U (en) * | 1991-09-25 | 1993-04-23 | アイホン株式会社 | Intercom connection channel selection device |
JP2007055642A (en) * | 2005-08-23 | 2007-03-08 | Sekisui Plastics Co Ltd | Chinese yam transporting and storing container, and chinese yam transporting and storing package using the same |
Also Published As
Publication number | Publication date |
---|---|
JPS5952862B2 (en) | 1984-12-21 |
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