US2038772A - Blasting charge - Google Patents

Blasting charge Download PDF

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Publication number
US2038772A
US2038772A US712050A US71205034A US2038772A US 2038772 A US2038772 A US 2038772A US 712050 A US712050 A US 712050A US 71205034 A US71205034 A US 71205034A US 2038772 A US2038772 A US 2038772A
Authority
US
United States
Prior art keywords
blasting charge
blasting
cap
charge
gas
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 - Lifetime
Application number
US712050A
Other languages
English (en)
Inventor
Taylor James
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries 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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US2038772A publication Critical patent/US2038772A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure
    • F42B3/06—Blasting cartridges, i.e. case and explosive for producing gas under pressure with re-utilisable case

Definitions

  • Explosives of the non-detonating type such as I blackpowder, cordite, and the like, undergo exotherinic decomposition on the application of flame or on exposure to high temperature.
  • This 5 decomposition results in the formation of products at high temperatures such as arev capable of igniting methane-air and coal dust-air mixtures, and such explosives are not safe for use in fiery mines.
  • ammonium nitrate for example ammonium nitrate or a mixture of ammonium nitrate and ammonium chloride or tities of gas, so that a comparatively large amount of heat is required and a correspondingly large amount of explosive or heating composition such as blackpowder.
  • mixtures of sodium nitrite or potassium nitrite with ammonium chloride or ammonium sulphate in a range of widely varying proportions, provide self-sustaining gas producing mixtures which when conned in a rigid ⁇ vessel of the type having a member adapted to permit emission of the gases at a predetermined and considerable pressure are capable of eiect- 49 ing blasting with safety in ery or dusty mines.
  • the mixtures used according to my invention when initiated under ordinary pressure, do not exhibit explosive properties, but sustain their own decomposition. A small proportion of moisture of the o rder of 0.5% is desirable for the reaction mixtureto be easily initiated by the application of heat.
  • -It is far from necessary that the two materials ⁇ should be present in stoichiometrlcal proportions.
  • 'I'he mixtures maybe used in powder form or may /be granular or compressed into cartridges and it is desirable that they be wrapped up in reproofed paper. They may, if desired, be loaded into the 5 container in the mine itself.
  • the invention is not limited to the case of coal mining, but it is of particularly g eat Value in that art since it not only provides a reliable method of blasting but 1o also facilitates the production of round coal.
  • the firing head (2) is pro- 20 vided with electrodes (1) and (8) of which one (8) is in metallic connection with the ring head (2) while the other (l) is insulated from the ring head.
  • the mounting of the insulated electrode (1) is such as-to allow no gas leakage at 25 pressures up to about. 25 tons per sq. in.
  • Terminais (I0) and (I I) are provided for the electrodes, which are used in initiating the cartridge elec-- trically.
  • a protective steel cap (3) having an aperture (I4) for the leads to the terminals from 3Q the cable of the exploder or other suitable source -of electrical energy is screwed on the ring head (2)
  • the blasting charge (I3) is introduced loqsely into the tube in therequisite amount.
  • the container remote from the 35 iiring head (2) there is placed afibre or. like sealing washer (6), the'steel bursting disc (5) adapted, to be ruptured at a predetermined pressure being held in position between the said washei ⁇ and the hollow screwed-in cap (4) which 40 is pierced with suitable channels for the venting of the gases and the direction and distribution of the blast.
  • An electric powder fuse or safety igniter (I2) containing for example 30 grains biackpowder is used.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Cosmetics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US712050A 1933-12-15 1934-02-19 Blasting charge Expired - Lifetime US2038772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35400/33A GB430258A (en) 1933-12-15 1933-12-15 Improved blasting cartridge

Publications (1)

Publication Number Publication Date
US2038772A true US2038772A (en) 1936-04-28

Family

ID=10377301

Family Applications (1)

Application Number Title Priority Date Filing Date
US712050A Expired - Lifetime US2038772A (en) 1933-12-15 1934-02-19 Blasting charge

Country Status (4)

Country Link
US (1) US2038772A (fr)
BE (1) BE406598A (fr)
FR (1) FR782220A (fr)
GB (1) GB430258A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563491A (en) * 1946-07-26 1951-08-07 Blasting assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE504789A (fr) * 1950-07-20
BE528505A (fr) * 1953-04-30
CN111174654A (zh) * 2020-03-25 2020-05-19 田永和 安全环保气体混合热能膨胀装置及施工方法
CN112979395B (zh) * 2021-04-12 2022-08-26 中北大学 一种气体发生剂及其制备方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563491A (en) * 1946-07-26 1951-08-07 Blasting assembly

Also Published As

Publication number Publication date
GB430258A (en) 1935-06-17
BE406598A (fr)
FR782220A (fr) 1935-05-31

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