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US1583922A - Protecting device for electric detonators - Google Patents

Protecting device for electric detonators Download PDF

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Publication number
US1583922A
US1583922A US748214A US74821424A US1583922A US 1583922 A US1583922 A US 1583922A US 748214 A US748214 A US 748214A US 74821424 A US74821424 A US 74821424A US 1583922 A US1583922 A US 1583922A
Authority
US
United States
Prior art keywords
wires
detonator
lead
insulation
contact
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
US748214A
Other languages
English (en)
Inventor
Harry L Grant
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.)
Atlas Powder Co
Original Assignee
Atlas Powder Co
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
Priority to US16544D priority Critical patent/USRE16544E/en
Application filed by Atlas Powder Co filed Critical Atlas Powder Co
Priority to US748214A priority patent/US1583922A/en
Priority to GB8415/25A priority patent/GB241796A/en
Priority to FR603249D priority patent/FR603249A/fr
Priority to DEA44851D priority patent/DE441795C/de
Application granted granted Critical
Publication of US1583922A publication Critical patent/US1583922A/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
    • F42B3/10—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
    • 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

Definitions

  • This invention relates to a protecting device for electric detonators.
  • the primary object of the invention is to provide a device of a simple and inexpensive nature adapted o to be applied tothe lead in wires of electric detonators and which will serve, while it is in place, to guard against the possibility of the detonator being prematurely exploded by its lead in wires accidentally coming in contact with a source of E. M. F.
  • Figure l is an elevation of an electric detonator and its lead in wires, having the device of the present invention applied thereto, and
  • Figure 2 is an enlarged sectional view through the safety device or shunt, illustrating its application to the lead in wires.
  • FIG. 5 designates the casing of an electric detonator and 6 and 7, the usual lead in wires which extend from said casing.
  • the flow of current of sufficient strength past point 8 explodes the detonator or blasting 80 cap.
  • the lead in wires are insulated for some distance from the detonator, as indicated at 6, 7 and the ends of the lead in wires are left bare beyond the point where the insulation terminates, for ready application to the firing cable leading from a blasting machine.
  • the wires 6 and 7 are crossed so that they touch each other at a point adjacent the termination of the insulation 6, 7 and at this oint of contact of the Wires the safety evice is applied.
  • This device consists of a soft metal body 9,such as lead for example, which may be pressed into firm contact with the wire, and in turn, hold the crossed portions of the wires in intimate contact with each other. ⁇ Vhen this is done the detonator will be effectually safeguarded against explosion if the exposed ends of the lead in wires should accidentally come in contact with a. source of electrical energy. This is due to the fact that the crossing of the wires and the securing of said wires in intimate contact with each other creates a short circuit at that po nt. If the exposed ends of the wires he accidentally, or otherwise, brought into contact with a source of E. M.
  • the safety device When it is desired to use the detonator the safety device may be stripped therefrom by pulling it longitudinally off the lead in Wires 05 and toward the free ends thereof. This action not only removes the safety device but 'it scrapes and cleans the exposed ends of the wires, leaving them ready for instant attachment to the blasting cable.
  • the insulation 6, 7 extends the entire distance from the safety device to the body 5 of the detonator itfollows that contact of a source of E. M. F. with that portion of the lead in wires lying between the safety device and the detonator will not result in the explosion of the detonator.
  • the device of the present invention is of utility at all times between the time of manufacture of the detonator and until the same is actually exploded on the job but it is of particular utility when the detonator is be ing transported and while itis being handled about the work preliminary to the actual firing of a charge.
  • the complete structure of Fig. 1 constitutes a unit as shipped to the trade.
  • the structure to be protected prior to its attachment to a main firing cable comprises a detonator and the two lead wires, the inner portions of which are covered with insulation and the outer portions of which are left bare so that the user does not have to expend time in scraping them free of insulation at the time of use. Therefore, the term lead in wires as used in the claims, is intended to mean the wires which are combined with the individual detonators so that the whole constitutes a unit to be shipped to the trade.
  • the lead in wires are 1 in bifilar form which prevents flow of induced currents. This, in conjunction with the safeguard afforded by the creation of the short circuit described, renders it certain that the detonator will not be exploded by stray currents from any source.
  • the invention is not limited to any particular material for the body 9. It is manifest that any material which will hold the crossed per tions of the wires in intimate contact with each other will carry out the essential object of the invention, viz, to create an electrical contact atthe point of crossing of said wires.
  • the shunt may be pressed firmly around -the wires without injuring them in any manner and also make a more perfect electrical joint i. e. a joint with little or no contact resistance.
  • a soft metal the shunt may be pressed on the wires firmly enough to cause it to conform to the shape of the wires where they pass through it, forming a joint similar to a. soldered joint. This procedure is made possible by the use of a metal which is softer than the metal of which the detonator wires are made.
  • Another advantage of the soft metal shunt is that the user may readily remove it by simply holding the wire with one hand and pulling it ofl' with the other when ready to fire the shot.
  • An electrical detonator in which a shunt made of a metal softer than that from which the terminal wires of the detonator are made, is placed squarely against the insulation of the terminal wires of the said electrical detonator.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Air Bags (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
US748214A 1924-11-06 1924-11-06 Protecting device for electric detonators Expired - Lifetime US1583922A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US16544D USRE16544E (en) 1924-11-06 Harry l
US748214A US1583922A (en) 1924-11-06 1924-11-06 Protecting device for electric detonators
GB8415/25A GB241796A (en) 1924-11-06 1925-03-30 Improvements in or relating to protecting devices for electric detonators
FR603249D FR603249A (fr) 1924-11-06 1925-04-14 Dispositif de protection pour détonateurs électriques
DEA44851D DE441795C (de) 1924-11-06 1925-04-30 Sicherheitsvorrichtung fuer elektrische Zuender

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US748214A US1583922A (en) 1924-11-06 1924-11-06 Protecting device for electric detonators

Publications (1)

Publication Number Publication Date
US1583922A true US1583922A (en) 1926-05-11

Family

ID=25008491

Family Applications (2)

Application Number Title Priority Date Filing Date
US16544D Expired USRE16544E (en) 1924-11-06 Harry l
US748214A Expired - Lifetime US1583922A (en) 1924-11-06 1924-11-06 Protecting device for electric detonators

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US16544D Expired USRE16544E (en) 1924-11-06 Harry l

Country Status (4)

Country Link
US (2) US1583922A (fr)
DE (1) DE441795C (fr)
FR (1) FR603249A (fr)
GB (1) GB241796A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2555636A (en) * 2016-11-07 2018-05-09 Martin Haddon Timothy Initiator unit

Also Published As

Publication number Publication date
GB241796A (en) 1925-10-29
FR603249A (fr) 1926-04-12
USRE16544E (en) 1927-02-08
DE441795C (de) 1927-03-11

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