ZA823601B - Sound operated start circuit - Google Patents

Sound operated start circuit

Info

Publication number
ZA823601B
ZA823601B ZA823601A ZA823601A ZA823601B ZA 823601 B ZA823601 B ZA 823601B ZA 823601 A ZA823601 A ZA 823601A ZA 823601 A ZA823601 A ZA 823601A ZA 823601 B ZA823601 B ZA 823601B
Authority
ZA
South Africa
Prior art keywords
start circuit
operated start
sound operated
sound
circuit
Prior art date
Application number
ZA823601A
Inventor
C Rowe
Original Assignee
Bhr Electronic Systems 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 Bhr Electronic Systems Ltd filed Critical Bhr Electronic Systems Ltd
Publication of ZA823601B publication Critical patent/ZA823601B/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/24—Remote control specially adapted for machines for slitting or completely freeing the mineral
    • 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
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
    • G08C23/02—Non-electrical signal transmission systems, e.g. optical systems using infrasonic, sonic or ultrasonic waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Water Turbines (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
ZA823601A 1981-05-28 1982-05-25 Sound operated start circuit ZA823601B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8116359 1981-05-28

Publications (1)

Publication Number Publication Date
ZA823601B true ZA823601B (en) 1983-04-27

Family

ID=10522111

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA823601A ZA823601B (en) 1981-05-28 1982-05-25 Sound operated start circuit

Country Status (3)

Country Link
EP (1) EP0066418A3 (en)
AU (1) AU8408682A (en)
ZA (1) ZA823601B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3941290A1 (en) * 1989-12-14 1991-06-20 Bochumer Eisen Heintzmann METHOD FOR MONITORING AND CONTROLLING OPERATING PROCEDURES IN A MINING UNDERGROUND OPERATION AND MONITORING AND CONTROL DEVICE THEREFOR
CN103527248B (en) * 2013-10-25 2015-07-29 中国矿业大学 Based on coal mine roof plate water barrier Stability Monitoring System and the method for fiber grating
CN109356655B (en) * 2018-12-06 2020-11-17 西安科技大学 Composite coal rock dynamic disaster prediction and early warning method based on gas concentration and acoustic emission extraction indexes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1387828A (en) * 1971-07-30 1975-03-19 Anderson Mavor Ltd Circuit for a prestart warning system
FR2250453A5 (en) * 1973-11-02 1975-05-30 France Etat Underwater acoustical remote control device - detects the absence of signals on the different frequencies
US4110742A (en) * 1977-07-11 1978-08-29 Hawkins J C Alarm circuit
DE2755633C2 (en) * 1977-12-14 1982-04-01 Siegfried R. Dipl.-Math. 7000 Stuttgart Ruppertsberg Remote control for controlling, switching on and switching between variable and fixed device functions and function variables in communications technology. devices
GB1586036A (en) * 1978-04-12 1981-03-11 Dresser Europe Sa Pre-start warning device for a machine

Also Published As

Publication number Publication date
AU8408682A (en) 1982-12-02
EP0066418A2 (en) 1982-12-08
EP0066418A3 (en) 1983-10-12

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