US3308758A - Ignition device - Google Patents

Ignition device Download PDF

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Publication number
US3308758A
US3308758A US469261A US46926165A US3308758A US 3308758 A US3308758 A US 3308758A US 469261 A US469261 A US 469261A US 46926165 A US46926165 A US 46926165A US 3308758 A US3308758 A US 3308758A
Authority
US
United States
Prior art keywords
casing
ignition
contact
pole piece
pole
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
US469261A
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English (en)
Inventor
Stadler Hans
Gawlick Heinz
Bendler Helmut
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.)
Dynamit Nobel AG
Original Assignee
Dynamit Nobel AG
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 Dynamit Nobel AG filed Critical Dynamit Nobel AG
Application granted granted Critical
Publication of US3308758A publication Critical patent/US3308758A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42CAMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00Details of fuzes
    • F42C19/08Primers; Detonators
    • F42C19/12Primers; Detonators electric

Definitions

  • the primer is pressed into a mechanically rigid casing of electrically conductive material which is provided with an exhaust aperture in extension of the primer composion and is adapted to be connected with the ground preferably directly and permanently or mechanically detachably, for example, by means of a threaded connection or the like, and in that the pole piece of the primer is held in resiliently yielding contact ing pressure connection with a mechanically rigid contact element of electrically conductive material which is adapted to be connected directly or indirectly mechanically with the current source and is held in a cap of thermoplastic material, preferably of polyethylene or polypropylene that is under mechanical stress and is secured to the casing by means of a threaded connection or the like at the end opposite the exhaust aperture.
  • the present invention proposes to arrange the primer in a casing of thermoplastic material, especially or" polyethylene or polypropylene provided with an exhaust aperture in the extension of theprimer composition which is under mechanical pre-stress when assembled, and to hold the primer by means of the casing in resiliently yielding contact pressure connection by way of its two poles with contact elements embedded into the casing and connected by insulated connecting wires led out of the casing through the mechanical securing means.
  • the latter may be provided with a mechanically rigid metallic cover.
  • a further object of the present invention resides in the provision of a primer device in which a permanent contact is assured between the various electrical connections and pole pieces thereof without danger of premature ignition or decomposition of the ignition composition.
  • Still another object of the present invention resides in the provision of a primer device which is reliable in operation over long periods of time notwithstanding temperature fluctuations and/or vibrations to which it may be exposed.
  • Still a further object of the present invention resides in the provision of an ignition device which is simple in construction and relatively inexpensive in manufacture and assembly without detriment to the reliability of operation over long periods of time.
  • FIGURE 1 is a longitudinal cross-sectional view through a first embodiment of an ignition element adapted to be threadably secured in accordance with the present invention.
  • FIGURE 2 is a longitudinal cross-sectional view through a modified embodiment of an ignition element in accordance with the present invention having current supply wires.
  • the electrical primer illustrated therein essentially consists of the cap 4, of the pole piece 6 separated from the cap 4 by the insulation 5 as well as of the electrically conductive ignition composition 8 electrically connecting the pole piece 6 by way of the reinforcement 7 with the cap 4 and having a cover 9.
  • This primer is so pressed into the casing 1 provided with the exhaust aperture 2 as well as with the threaded extension 3 that the exhaust aperture 2 1s disposed in extension of the ignition composition 8.
  • the cap 10 is arranged on the end of the casing 1 opposite the exhaust aperture 2 and is secured by means of mutually engaging annular projections 11 and grooves 12.
  • the contact element 13 is held in the cap 16 by means of an extension.
  • the cap 10 made of thermoplastic material, especially of polyethylene and propylene, is subjected to such mechanical stress when assembled that the contact pin 13 together with its conical point are held in permanent resiliently yielding contacting pressure connec tion with the pole piece 6.
  • an electric current is supplied by way of an ignition means, battery, or the like, or also by way of a current network connected directly or also indirectly by way of a lead-in wire connection to the rear end 14 of the contact pin 13, then the current flows by way of the contact element 13, the pole piece 6, the ignition composition 8, the reinforcement 7, and the cap 4 to the casing 1 connected by means of the threaded extension 3 with the ground of, the installation (not shown) whereby the ignition composition 8 is ignited and thus the intended operation is released.
  • the primer is surrounded on all sides by the casing 1 which is made of thermoplastic material, especially of polyethylene and which is under mechanical stress, leaving the exhaust aperture 2 in extension of the ignition composition 8; the contact element 17 with its feed wire 18 as well as the contact element 19 with its feed wire 24 are also held in resiliently yielding contacting pressure connection with the pole piece 6 and the cap 4, respectively, by means of this mechanically stressed casing 1.
  • the insulation 23 of the wire 18 is established separated.
  • the insulation of wire 18 could also be made in one piece with the casing 1.
  • the casing 1 i provided with a mechanically rigid metallic cover 21 for the protection of the casing 1, especially during insertion into an accommodating device (not illustrated) of an installation, also not illustrated.
  • the cover 21, like the casing 1, is, of course, provided with an exhaust aperture.
  • a polyethylene foil 16 is inserted for the better protection of the ignition composition 8 at the exhaust side of the cap 4 between the cap and the casing 1.
  • a particular advantage of the arrangement and of the construction in accordance with the present invention of the first'described element is its re-usability in that it may be charged repeatedly through the exhaust aperture 2 with an electric primer which may also contain a therrnic mixture.
  • a further advantage of both ignition devices is the fact that they can be tested at all times as to their operability whereby the electrical resistance thereof is measured by mean of a measuring voltage, of for example, 1.5 volts, connected to the ignition element. If this resistance lies within the prescribed range, then the desired operating safety and reliability is given.
  • the obtainable small ignition times of, for example, 0.2 to 0.3 ms. with an ignition energy of about 2 mw. are advantageous as they permit utilizing the ignition element according to the present invention also for technological measurements.
  • An ignition element for an electrical ignition device comprising:
  • said mechanically rigid casing means being provided with exhaust aperture means in the extension of the ignition composition and being adapted to be cOnnected with ground, and a primer assembly arranged at least in part in said casing means including electrically conductive means forming a second pole piece, insulation means between said first and second pole pieces, ignition composition means electrically connected in series between said second pole piece and said casing means,
  • An ignition element for an electrical ignition device is provided.
  • primer means pressed into said casing means including pole means, ignition composition means electrically connected in series between said pole means and said casing means, contact means of electrically conductive material directly engaging said pole means on the side opposite said ignition composition means, said pole piece being electrically connected in series between said contact means and said ignition composition means, and means for normally holding said contact means in resiliently yielding contact pressure connection with said pole means including cap means of thermoplastic material secured onto said casing means and mechanically stressed in the assembled unfired normal condition.
  • An ignition element for an electrical ignition device comprising:
  • a primer assembly including mechanically rigid first pole means of electrically conductive material, second pole means, ignition composition means electrically in series 'between said first pole means and said second pole means, a contact means of electrically conductive material for each of said pole means,
  • each of said pole means in resiliently yielding contact pressure connection with their corresponding contact means
  • casing means accommodating therein said primer assembly and essentially consisting of thermoplastic material, said casing means being mechanically stressed in the assembled position
  • An ignition element according to claim 4, wherein said first pole means is provided with exhaust aperture means in the extension of the ignition composition, said casing means is provided with exhaust aperture means in extension of said ignition composition, said insulated line means is mechanically connected with said contact means, and including insulation means between said first and second pole means.
  • thermoplastic casing means is provided with a mechanically rigid metallic cover means.
  • thermoplastic casing means is provided with a mechanically rigid metallic cover means.
  • An ignition element comprising: a primer cap including a first pole piece, a second pole piece, insulation means for electrically insulating said first pole piece from said second pole piece, ignition means including an ignition composition and being electrically connected in series between said first pole piece and said second pole piece, and a substantially rigid first casing enclosing and securely holding in assembled relationship said pole pieces, said insulation means and said ignition means as a single unit; a second substantially rigid casing for securely receiving said primer cap; an electrical contact engaging and in series circuit connection with one of said pole pieces; and mounting means resiliently mechanically connecting said contact with said second casing and resiliently urging said contact into secure tight engagement with said one of said pole pieces in the normal unfired condition of said ignition element.
  • said electrical contact has one conically formed terminal end engaging said one of said pole pieces, an intermediate annular portion of reduced diameter and opposite threaded terminal end portion for mechanically receiving an electrical lead.
  • said mounting means is a cup-shaped thermoplastic closure cap having a substantially central aperture wit-h walls securely engaged within said contact annular portion of reduced diameter; said second casing including a substantially tubular portion; said closure cap being telescopically engaged with one end of said tubular portion.
  • the other of said pole pieces has a portion extending outwardly of said first casing; a second electrical contact having a substantially cup shape receiving said other pole piece extension telescopically; said mounting means resiliently urging said second contact into secure electrical engagement with said other pole piece extension; a second feed Wire extending through said mounting means and being electrically connected with said second contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Air Bags (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Lift Valve (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Fuses (AREA)
US469261A 1964-07-02 1965-07-02 Ignition device Expired - Lifetime US3308758A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED0044823 1964-07-02

Publications (1)

Publication Number Publication Date
US3308758A true US3308758A (en) 1967-03-14

Family

ID=7048578

Family Applications (1)

Application Number Title Priority Date Filing Date
US469261A Expired - Lifetime US3308758A (en) 1964-07-02 1965-07-02 Ignition device

Country Status (9)

Country Link
US (1) US3308758A (ru)
BE (1) BE666307A (ru)
CH (1) CH438125A (ru)
DE (1) DE1446952B1 (ru)
DK (1) DK118062B (ru)
GB (1) GB1113947A (ru)
NL (1) NL6508540A (ru)
NO (1) NO117682B (ru)
SE (1) SE309740B (ru)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710719A (en) * 1971-01-08 1973-01-16 Amp Inc Detonator for an explosively operated connector
US3728967A (en) * 1969-06-13 1973-04-24 Us Navy Tri-pri three contact primer
US3867885A (en) * 1972-09-15 1975-02-25 Dynamit Nobel Ag Electrical primer
US3971320A (en) * 1974-04-05 1976-07-27 Ici United States Inc. Electric initiator
US5144893A (en) * 1991-08-06 1992-09-08 The United States Of America As Represented By The Secretary Of The Army Safe ordnance initiation system
US5404263A (en) * 1992-08-27 1995-04-04 Oea, Inc. All-glass header assembly used in an inflator system
US5423261A (en) * 1992-12-01 1995-06-13 Giat Industries Pyrotechnic trigger
US5709724A (en) * 1994-08-04 1998-01-20 Coors Ceramics Company Process for fabricating a hermetic glass-to-metal seal
US6274252B1 (en) * 1994-08-04 2001-08-14 Coors Ceramics Company Hermetic glass-to-metal seal useful in headers for airbags

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2355255C2 (de) * 1973-11-05 1984-05-10 Gianni Verga Milano Casati Anzündvorrichtung für Artillerietreibladungen
DE2654087C3 (de) * 1976-11-29 1981-07-16 Dynamit Nobel Ag, 5210 Troisdorf Elektrisches Zündmittel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2705308A (en) * 1950-04-13 1955-03-29 United Carr Fastener Corp Lamp socket having means for mounting and sealing it in an apertured support
US2958064A (en) * 1957-11-26 1960-10-25 Amp Inc Circuit board and socket construction
US2957415A (en) * 1955-11-10 1960-10-25 Montedison Spa Safety device for electric primers for mines, to protect against ignition by stray electric currents
US3090310A (en) * 1960-05-04 1963-05-21 George W Peet Conductive explosive primer mixture and device
US3094932A (en) * 1960-07-15 1963-06-25 William D Greenlees Electromagnetic radiation proof igniting device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2705308A (en) * 1950-04-13 1955-03-29 United Carr Fastener Corp Lamp socket having means for mounting and sealing it in an apertured support
US2957415A (en) * 1955-11-10 1960-10-25 Montedison Spa Safety device for electric primers for mines, to protect against ignition by stray electric currents
US2958064A (en) * 1957-11-26 1960-10-25 Amp Inc Circuit board and socket construction
US3090310A (en) * 1960-05-04 1963-05-21 George W Peet Conductive explosive primer mixture and device
US3094932A (en) * 1960-07-15 1963-06-25 William D Greenlees Electromagnetic radiation proof igniting device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728967A (en) * 1969-06-13 1973-04-24 Us Navy Tri-pri three contact primer
US3710719A (en) * 1971-01-08 1973-01-16 Amp Inc Detonator for an explosively operated connector
US3867885A (en) * 1972-09-15 1975-02-25 Dynamit Nobel Ag Electrical primer
US3971320A (en) * 1974-04-05 1976-07-27 Ici United States Inc. Electric initiator
US5144893A (en) * 1991-08-06 1992-09-08 The United States Of America As Represented By The Secretary Of The Army Safe ordnance initiation system
US5404263A (en) * 1992-08-27 1995-04-04 Oea, Inc. All-glass header assembly used in an inflator system
US5423261A (en) * 1992-12-01 1995-06-13 Giat Industries Pyrotechnic trigger
US5709724A (en) * 1994-08-04 1998-01-20 Coors Ceramics Company Process for fabricating a hermetic glass-to-metal seal
US6274252B1 (en) * 1994-08-04 2001-08-14 Coors Ceramics Company Hermetic glass-to-metal seal useful in headers for airbags

Also Published As

Publication number Publication date
SE309740B (ru) 1969-03-31
NL6508540A (ru) 1966-01-03
BE666307A (ru) 1965-11-03
NO117682B (ru) 1969-09-08
DK118062B (da) 1970-06-29
DE1446952B1 (de) 1970-07-09
GB1113947A (en) 1968-05-15
CH438125A (de) 1967-06-15

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