GB577258A - Improvements in telephone alarm call systems - Google Patents
Improvements in telephone alarm call systemsInfo
- Publication number
- GB577258A GB577258A GB8960/44A GB896044A GB577258A GB 577258 A GB577258 A GB 577258A GB 8960/44 A GB8960/44 A GB 8960/44A GB 896044 A GB896044 A GB 896044A GB 577258 A GB577258 A GB 577258A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- line
- relays
- common
- group
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/432—Arrangements for calling a subscriber at a specific time, e.g. morning call service
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Alarm Systems (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
577,258. Time alarm signals. MERCER, R. (Automatic Electric Laboratories, Inc.) May 11, 1944, No. 8360. [Class 118 (ii)] [Also in Group XXXIX] A telephone exchange is provided with apparatus for automatically ringing certain subscribers at pre-determined times of day. A common timecontrolled step-by-step switch G which makes one rotation in 24 hours and may for example rest for 7¢ minutes on each contact and also between adjacent contacts connects up in turn a series of relays D, each of which is common to the group of subscribers to be called at the corresponding time. Relays A, B, C are individual to each subscriber's line and a common relay E which energizes momentarily over cam F once per minute connects up relay B of each line associated with the operated relay D, provided the line is not busy. Relay B locks and applies ringing current to the line through ring-trip relay A which responds upon reply and lights lamp L1 individual to the subscriber. The ringing may be continuous or coded to distinguish the alarm call from an ordinary call. If the line is busy, relay C is operative and relay B is disconnected, and further tests are made when relay E energizes again. A pair of relays H, J which operate in succession over time-controlled cams K after relay D has energized and lock up as long as any relay A of the group remains unoperated serve to connect up an alarm bell AB and lamp AL a certain time after the calls are initiated, so that an attendant may check which lamps L1, L2 ... remain unlighted and take any necessary action. Relay D falls back when the switch G steps on and unlocks all relays A, B. In a modification, relay E and cam F are eliminated and a common group of lamps L1, L2 .... serves successively for the different groups of subscribers. Also, relay B is released by the operation of relay A so that the line is rendered free as soon as the alarm call is answered.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8960/44A GB577258A (en) | 1944-05-11 | 1944-05-11 | Improvements in telephone alarm call systems |
US588623A US2483214A (en) | 1944-05-11 | 1945-04-16 | Telephone alarm call system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8960/44A GB577258A (en) | 1944-05-11 | 1944-05-11 | Improvements in telephone alarm call systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB577258A true GB577258A (en) | 1946-05-10 |
Family
ID=9862630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8960/44A Expired GB577258A (en) | 1944-05-11 | 1944-05-11 | Improvements in telephone alarm call systems |
Country Status (2)
Country | Link |
---|---|
US (1) | US2483214A (en) |
GB (1) | GB577258A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2901542A (en) * | 1956-10-12 | 1959-08-25 | American Telephone & Telegraph | "wake up" or "morning call" system for automatically signaling private branch exchange extension stations |
FR2126093A1 (en) * | 1971-02-24 | 1972-10-06 | Intertelephonie |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3046339A (en) * | 1959-07-07 | 1962-07-24 | Bell Telephone Labor Inc | Morning call system |
US3218391A (en) * | 1960-11-07 | 1965-11-16 | Hashimoto Kazuo | Automatic reporting apparatus |
DE1287652B (en) * | 1965-06-03 | 1969-01-23 | ||
US3393272A (en) * | 1965-11-19 | 1968-07-16 | Hanson Oliver Wendell | Automatic telephone guest call system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US549346A (en) * | 1895-11-05 | Transmitting time-signals | ||
US481483A (en) * | 1892-08-23 | Telephone system | ||
US940692A (en) * | 1906-01-27 | 1909-11-23 | Hilbert W Howard | Time-controlled alarm mechanism. |
US1358720A (en) * | 1915-11-23 | 1920-11-16 | Herbert M Friendly | Signal system and apparatus |
US1369146A (en) * | 1920-06-28 | 1921-02-22 | Samuel M Thomas | Signaling system |
FR759518A (en) * | 1932-10-29 | 1934-02-05 | Materiel Telephonique | Improvements to systems for transmitting news, information, concerts and more |
US2298489A (en) * | 1941-09-10 | 1942-10-13 | Kellogg Switchboard & Supply | Group-call telephone system |
-
1944
- 1944-05-11 GB GB8960/44A patent/GB577258A/en not_active Expired
-
1945
- 1945-04-16 US US588623A patent/US2483214A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2901542A (en) * | 1956-10-12 | 1959-08-25 | American Telephone & Telegraph | "wake up" or "morning call" system for automatically signaling private branch exchange extension stations |
FR2126093A1 (en) * | 1971-02-24 | 1972-10-06 | Intertelephonie |
Also Published As
Publication number | Publication date |
---|---|
US2483214A (en) | 1949-09-27 |
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