GB577258A - Improvements in telephone alarm call systems - Google Patents

Improvements in telephone alarm call systems

Info

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
Application number
GB8960/44A
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
Application filed by Individual filed Critical Individual
Priority to GB8960/44A priority Critical patent/GB577258A/en
Priority to US588623A priority patent/US2483214A/en
Publication of GB577258A publication Critical patent/GB577258A/en
Expired legal-status Critical Current

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.
GB8960/44A 1944-05-11 1944-05-11 Improvements in telephone alarm call systems Expired GB577258A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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