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GB846895A - An electronic indicator system more particularly for use in mines - Google Patents

An electronic indicator system more particularly for use in mines

Info

Publication number
GB846895A
GB846895A GB3157956A GB3157956A GB846895A GB 846895 A GB846895 A GB 846895A GB 3157956 A GB3157956 A GB 3157956A GB 3157956 A GB3157956 A GB 3157956A GB 846895 A GB846895 A GB 846895A
Authority
GB
United Kingdom
Prior art keywords
cable
disclosed
oscillators
signal
mines
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
GB3157956A
Inventor
Christopher Arthu Henn-Collins
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.)
Sargrove Electronics Ltd
Original Assignee
Sargrove Electronics Ltd
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 Sargrove Electronics Ltd filed Critical Sargrove Electronics Ltd
Priority to GB3157956A priority Critical patent/GB846895A/en
Priority to GB2528259A priority patent/GB888199A/en
Priority to BE587080A priority patent/BE587080R/en
Priority to FR823571A priority patent/FR77450E/en
Publication of GB846895A publication Critical patent/GB846895A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18—Special adaptations of signalling or alarm devices
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • G08C15/02—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

846,895. Multiplex systems. SARGROVE ELECTRONICS Ltd. Jan. 10, 1958 [Oct. 17, 1956], No. 31579/56. Drawings to Specification. Class 40 (4). [Also in Group XXXVIII] An electronic signalling system comprises a number of sources each generating a unique frequency, the source being connected to a common amplifiying means by a cable in which the unique frequencies pass to separate indicator means via a filter circuit. As disclosed, transistorized crystal oscillators are used, the power supply for the oscillators being fed down the signal cable. An oscillator at the end of each cable branch is reserved for indicating line failure. The signal from this monitor is also used to derive A.G.C. for the amplifier. The O.P. from the crystal gates used in the filter unit are used to illuminate indicator lamps. The system is disclosed for mine signalling and full details of conventional circuits are given.
GB3157956A 1956-10-17 1956-10-17 An electronic indicator system more particularly for use in mines Expired GB846895A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB3157956A GB846895A (en) 1956-10-17 1956-10-17 An electronic indicator system more particularly for use in mines
GB2528259A GB888199A (en) 1956-10-17 1959-07-23 Electronic remote indicating and/or controlling apparatus
BE587080A BE587080R (en) 1956-10-17 1960-01-28 Electronic indicating device for use in mines.
FR823571A FR77450E (en) 1956-10-17 1960-04-06 Electronic indicating device for use in mines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3157956A GB846895A (en) 1956-10-17 1956-10-17 An electronic indicator system more particularly for use in mines

Publications (1)

Publication Number Publication Date
GB846895A true GB846895A (en) 1960-08-31

Family

ID=10325236

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3157956A Expired GB846895A (en) 1956-10-17 1956-10-17 An electronic indicator system more particularly for use in mines

Country Status (2)

Country Link
FR (1) FR77450E (en)
GB (1) GB846895A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510283A1 (en) * 1981-07-22 1983-01-28 Bergwerksverband Gmbh MULTI-POSITION CONTROL AND MEASUREMENT INSTALLATION

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510283A1 (en) * 1981-07-22 1983-01-28 Bergwerksverband Gmbh MULTI-POSITION CONTROL AND MEASUREMENT INSTALLATION

Also Published As

Publication number Publication date
FR77450E (en) 1962-03-02

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