US2558134A - Commercial detonator - Google Patents

Commercial detonator Download PDF

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Publication number
US2558134A
US2558134A US762A US76248A US2558134A US 2558134 A US2558134 A US 2558134A US 762 A US762 A US 762A US 76248 A US76248 A US 76248A US 2558134 A US2558134 A US 2558134A
Authority
US
United States
Prior art keywords
detonator
commercial
diameter
inch
fuze
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
US762A
Other languages
English (en)
Inventor
Cecil R L Hall
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 US2558134A publication Critical patent/US2558134A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C7/00—Non-electric detonators; Blasting caps; Primers
    • 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
    • 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
    • F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
    • F42B3/107—Sealing-plugs characterised by the material used
    • 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
    • F42B3/195—Manufacture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition

Definitions

  • the present invention relates to commercial detonators adapted to be initiated by means of a fuze.
  • the invention relates particularly to commercial detonators having a metal casing of internal diameter lying between 0.2 inch and 0.35 inch.
  • the diameter of the fuze normally used with commercial detonators is only slightly less than the internal diameter of the detonator tube. Consequently the fuze can be inserted into the detonator and retained in position by a com paratively slight deformation of the tube produced by means of a crimper. Typical values for internal diameter of tube and external diameter of fuze are 0.227 inch and 0.191 inch respectively, leaving a clearance of approximately 0.018 inch.
  • the object of the present invention is to provide a commercial detonator having a metal casing of internal diameter lying between 0.2 inch and 0.35 inch in which the space in the casing unoccupied by the explosive charge is so modified as particularly to permit the detonator to be used efliciently and conveniently with the said fuze of reduced diameter.
  • a commercial detonator comprises a metal casing closed at one end and open at the other and having an internal diameter not less than 0.2 inch, wherein the closed end portion is provided with explosive material, and wherein the rest of the casing is provided with an internal sleeve having an internal diameter lying between 0.075 inch and 0.140 inch.
  • the internal sleeve is of comparatively soft material as for example paper, soft vulcanised rubber, synthetic rubber. This is to avoid any undue frictional effect on the explosive composition and to permit transmission of the crimp pressure to the fuze inserted into the detonator of the invention.
  • the internal sleeve has an ex ternal diameter only slightly less than the internal diameter of the detonator tube and an internal diameter slightly greater than the external diameter of the fuze of reduced diameter the detonator of the invention is adapted to accommodate.
  • the length of the sleeve is slightly less than the unturned and unnicked length of that part of the metal casing which is free from in the metal casing so as to be in contact with the surface of the explosive charge and is held in position by a very short length of the detonator tube which is turned over or nicked.
  • fuze of reduced diameter corresponding to the particular internal diameter of the sleeve can be inserted and retained in position by applying a crimp to the detonator tube in the normal manner. A very satisfactory waterproof joint may thus be obtained.
  • Fig. 1 is a longitudinal section of a detonator according to the invention and Fig. 2 is a longitudinal section through a detonator according to the invention shewing fuze of reduced diameter accommodated and crimped therein.
  • I is a detonator metal casing
  • 2 is the explosive charge
  • 3 is an internal sleeve of paper
  • 4 is the turned over short metal portion of the casing I
  • 5 is a fuze of reduced diameter inserted into the internal sleeve 3 and held in position by the deformations l in the sleeve 3 produced by the crimp 6 given to the metal casing I.
  • a commercial detonator comprising a metal casing tube closed at one end and opened at the other end, the closed end portion of said casin tube having an explosive material packed therein, the major portion of the remainder of said casing having an internal cylindrical sleeve of relatively soft material positioned wholly within the same in contact with the surface of the explosive charge and held in position by an upset portion at the opened end of said tube, said sleeve being adapted for receiving a reduced diameter explosive.
  • the internal sleeve is positioned withas safety fuse.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Air Bags (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
US762A 1947-03-05 1948-01-06 Commercial detonator Expired - Lifetime US2558134A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6213/47A GB624134A (en) 1947-03-05 1947-03-05 Improvements in or relating to blasting detonators

Publications (1)

Publication Number Publication Date
US2558134A true US2558134A (en) 1951-06-26

Family

ID=9810474

Family Applications (1)

Application Number Title Priority Date Filing Date
US762A Expired - Lifetime US2558134A (en) 1947-03-05 1948-01-06 Commercial detonator

Country Status (5)

Country Link
US (1) US2558134A (fr)
BE (1) BE480958A (fr)
DE (1) DE851920C (fr)
FR (1) FR960022A (fr)
GB (1) GB624134A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122097A (en) * 1961-10-10 1964-02-25 Du Pont Non-electric initiating assembly
US3241489A (en) * 1963-05-06 1966-03-22 Ensign Bickford Co Composite explosive signal transmission cord and method of making same
US3640222A (en) * 1968-12-27 1972-02-08 Hercules Inc Booster-cap assembly
US4671178A (en) * 1984-07-10 1987-06-09 Aeci Limited Low energy fuses
EP1390324A2 (fr) * 2001-04-24 2004-02-25 The Ensign-Bickford Company Detonateur non electrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707437A (en) * 1949-08-25 1955-05-03 Du Pont Blasting explosive assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122097A (en) * 1961-10-10 1964-02-25 Du Pont Non-electric initiating assembly
US3241489A (en) * 1963-05-06 1966-03-22 Ensign Bickford Co Composite explosive signal transmission cord and method of making same
US3640222A (en) * 1968-12-27 1972-02-08 Hercules Inc Booster-cap assembly
US4671178A (en) * 1984-07-10 1987-06-09 Aeci Limited Low energy fuses
AU581667B2 (en) * 1984-07-10 1989-03-02 Aeci Limited Low energy fuses
EP1390324A2 (fr) * 2001-04-24 2004-02-25 The Ensign-Bickford Company Detonateur non electrique
US20040200372A1 (en) * 2001-04-24 2004-10-14 Gladden Ernest L. Non-electric detonator
EP1390324A4 (fr) * 2001-04-24 2005-09-07 Detonateur non electrique
US7188566B2 (en) 2001-04-24 2007-03-13 Dyno Nobel Inc. Non-electric detonator

Also Published As

Publication number Publication date
BE480958A (fr)
DE851920C (de) 1952-10-09
FR960022A (fr) 1950-04-12
GB624134A (en) 1949-05-27

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