GB191501119A - Improvements in or relating to Electrical Alarm Apparatus for Mines and like places. - Google Patents

Improvements in or relating to Electrical Alarm Apparatus for Mines and like places.

Info

Publication number
GB191501119A
GB191501119A GB191501119DA GB191501119A GB 191501119 A GB191501119 A GB 191501119A GB 191501119D A GB191501119D A GB 191501119DA GB 191501119 A GB191501119 A GB 191501119A
Authority
GB
United Kingdom
Prior art keywords
casing
mines
places
tubes
grooves
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
Inventor
John Patrick O'donnell
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
Application granted granted Critical
Publication of GB191501119A publication Critical patent/GB191501119A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21F17/185—Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence

Abstract

1119. O'Donnell, J. P., [Hodges, G. D.,and Smith, D.]. Jan. 23. Automatic alarm signals. - Relates to alarm apparatus for mines and like places, in which a telescopic rod, as described in Specification 11,916/14, is employed to indicate or signal movement of the roof, walls, &c. In the construction shown in Figs. 1 and 2, the telescopic rod, which is formed of two tubular elements 1, 2, passes through the casing 10 containing the battery and bell magnet 22. An electric lamp 28 is provided to give a visual signal. When the tubes are compressed, a contact 30 is forced against another contact 31 by a ring 32 clamped on one of the tubes, and so closes the alarm circuit. The battery is provided with contacts adapted to engage fixed contacts on the interior of the casing, so that it may be readily removed or replaced, and the circuit wires are placed in grooves in the casing, the grooves being subsequently filled with paraffin wax or like insulating-material.
GB191501119D 1915-01-23 1915-01-23 Improvements in or relating to Electrical Alarm Apparatus for Mines and like places. Expired GB191501119A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191501119T 1915-01-23

Publications (1)

Publication Number Publication Date
GB191501119A true GB191501119A (en) 1915-09-23

Family

ID=32648832

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191501119D Expired GB191501119A (en) 1915-01-23 1915-01-23 Improvements in or relating to Electrical Alarm Apparatus for Mines and like places.

Country Status (1)

Country Link
GB (1) GB191501119A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692924A (en) * 1950-07-17 1954-10-26 Williams Charlie Warning device for miners

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692924A (en) * 1950-07-17 1954-10-26 Williams Charlie Warning device for miners

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