GB842043A - Safety electric primers for mines, protected against lgnition by extraneous electric currents - Google Patents

Safety electric primers for mines, protected against lgnition by extraneous electric currents

Info

Publication number
GB842043A
GB842043A GB34150/56A GB3415056A GB842043A GB 842043 A GB842043 A GB 842043A GB 34150/56 A GB34150/56 A GB 34150/56A GB 3415056 A GB3415056 A GB 3415056A GB 842043 A GB842043 A GB 842043A
Authority
GB
United Kingdom
Prior art keywords
circuit
short
primer
leads
core
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
GB34150/56A
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.)
Montedison SpA
Original Assignee
Montedison SpA
Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA
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 Montedison SpA, Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA filed Critical Montedison SpA
Publication of GB842043A publication Critical patent/GB842043A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C23/00—Compounds containing at least one halogen atom bound to a ring other than a six-membered aromatic ring
    • C07C23/02—Monocyclic halogenated hydrocarbons
    • C07C23/10—Monocyclic halogenated hydrocarbons with a six-membered ring
    • C07C23/12—Hexachlorocyclohexanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/24—Obtaining flakes by scraping a solid layer from a surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F42B3/182—Safety initiators resistant to premature firing by static electricity or stray currents having shunting means

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Air Bags (AREA)
  • Fuses (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

842,043. Electric blasting fuzes. MONTECATINI SOC. GENERALE PER L'INDUSTRIA MINERARIA E CHIMICA. Nov. 8, 1956 [Nov. 10, 1955], No. 34150/56. Class 9(1). An electric primer 1 for blasting charges is provided with a safety device to prevent accidental ignition by stray currents, which device when set forms a short circuit for the primer leads and can be operated by remote control to break the short-circuit. The leads 8 and a conductor 9 electrically connected to the primer casing are connected to contact blades 4 mounted on a carrier 5 surrounding a slidable core 2 held in position by a spring 10. The core has a flared head contacting the blades 4 to form a shortcircuit between the leads and the primer casing. Immediately before firing the primer an electro-magnet 3 is energized through a circuit independent of the firing circuit and moves the core 2 so that the short-circuit is destroyed. The carrier 5 together with the core 2 and electro-magnet 3 are sealed in a casing 7 by plugs 6 through which extend the leads. In a modification the blades 4 are electrically connected by the head of a pin which is urged out of contact by a spring but maintained in the short-circuiting position by fuzible insulating material, e.g. sulphur, in which a heating coil is embedded. The coil is in a circuit independent of the firing circuit and on passage of a current fuses the insulating material, whereupon the pin moves to destroy the shortcircuit. In a third form, the short-circuit pin is moved by pneumatic means which may be a tube led through a closure plug 6 to a compressed air supply or a vacuum chamber.
GB34150/56A 1955-11-10 1956-11-08 Safety electric primers for mines, protected against lgnition by extraneous electric currents Expired GB842043A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT339851X 1955-11-10

Publications (1)

Publication Number Publication Date
GB842043A true GB842043A (en) 1960-07-20

Family

ID=11238478

Family Applications (2)

Application Number Title Priority Date Filing Date
GB34150/56A Expired GB842043A (en) 1955-11-10 1956-11-08 Safety electric primers for mines, protected against lgnition by extraneous electric currents
GB20666/58A Expired GB874332A (en) 1955-11-10 1958-06-27 Improvements in safety electric primers for mines

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB20666/58A Expired GB874332A (en) 1955-11-10 1958-06-27 Improvements in safety electric primers for mines

Country Status (6)

Country Link
US (1) US2957415A (en)
BE (1) BE552499A (en)
CH (2) CH339851A (en)
DE (1) DE1022140B (en)
FR (2) FR1166112A (en)
GB (2) GB842043A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2178830A (en) * 1985-06-28 1987-02-18 Moorhouse D J Detonators

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3094932A (en) * 1960-07-15 1963-06-25 William D Greenlees Electromagnetic radiation proof igniting device
US3075461A (en) * 1960-10-28 1963-01-29 Bilker & Moyerman Method and apparatus for detonating radio frequency sensitive blasting caps
DE1446952B1 (en) * 1964-07-02 1970-07-09 Dynamit Nobel Ag Electric ignition device
US3414292A (en) * 1966-07-01 1968-12-03 Eaton Yale & Towne Inflatable safety device
US3457431A (en) * 1968-02-20 1969-07-22 Dow Chemical Co Time-delayed control device
US3585933A (en) * 1969-05-02 1971-06-22 Us Army Detonator safety device
IL74188A0 (en) * 1985-01-29 1985-04-30 State Of Israel Ministriy Of D Pyrotechnic grenade
US5129322A (en) * 1990-05-14 1992-07-14 Jet Research Center, Inc. Explosive tubing cutter and method of assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726053A (en) * 1927-10-10 1929-08-27 Brown Ladura Alexander Safety coupler
FR718686A (en) * 1930-07-23 1932-01-27 Lignoza Spolka Akcyjna Electrical assembly for igniters
US2026962A (en) * 1934-03-01 1936-01-07 George D Brown Safety switch
US2494256A (en) * 1945-09-11 1950-01-10 Gulf Research Development Co Apparatus for perforating well casings and well walls
NL198656A (en) * 1949-01-22
US2632389A (en) * 1949-09-13 1953-03-24 Atlas Powder Co Electric explosion initiator
US2704032A (en) * 1951-01-30 1955-03-15 Maruschak Nick Safety mine shooting devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2178830A (en) * 1985-06-28 1987-02-18 Moorhouse D J Detonators
US4869171A (en) * 1985-06-28 1989-09-26 D J Moorhouse And S T Deeley Detonator

Also Published As

Publication number Publication date
US2957415A (en) 1960-10-25
FR74069E (en) 1960-11-07
FR1166112A (en) 1958-11-03
CH350234A (en) 1960-11-15
BE552499A (en) 1956-11-30
DE1022140B (en) 1958-01-02
CH339851A (en) 1959-07-15
GB874332A (en) 1961-08-02

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