US3286631A - Electrical primer - Google Patents

Electrical primer Download PDF

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Publication number
US3286631A
US3286631A US395469A US39546964A US3286631A US 3286631 A US3286631 A US 3286631A US 395469 A US395469 A US 395469A US 39546964 A US39546964 A US 39546964A US 3286631 A US3286631 A US 3286631A
Authority
US
United States
Prior art keywords
insulating
case
flange
annular groove
tubular
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
US395469A
Other languages
English (en)
Inventor
Gawlick Heinz
Bendler Hellmut
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 US3286631A publication Critical patent/US3286631A/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
    • F42B3/14—Spark initiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/12—Primers; Detonators electric

Definitions

  • the present invention relates to an electrical primer, and more particularly to a considerably simplified construction of an electrical fuse or primer operable according to the gap-ignition-principle for the ignition of cartridges, shells, propelling charge containers or the like.
  • Thepresent invention essentially consists in that the primer is composed, without the primer composition, at the most of three parts, namely of the case, the insulation of the pole piece and the pole piece.
  • Electrical primers that are constructed according to the gap-principle consists of a larger number of individual parts. In most cases five parts are required, namely a casing, a pole piece, an insulating cup, an insulating disk which determines the gap and a metallic ring piece or cup which receives the primer composition and serves for the increase of the rigidity.
  • the manufacture of electrical primers according to this principle is therefore relatively costly and expensive because the dimensions of the individual parts have to be maintained with small tolerances.
  • the present invention now essentially consists in that the primer, without the primer composition, consists at the most of three parts, namely of the casing, the insulation of the pole piece and the pole piece.
  • an object of the present invention to provide an electrical primer which is simple in construction, relatively inexpensive in manufacture and consists of relatively fewer parts than necessary heretofore.
  • a further object of the present invention resides in the provision of an electrical primer assembly obviating the need for a relatively large number of individual parts that have to be manufactured with small tolerances.
  • Another object of the present invention resides in the provision of an electrical primer which reduces in a farreaching manner the several individual parts necessitated in the prior art devices by combining the same into internal structures.
  • reference numeral 1 designates therein the case made of any suitable material which is provided on one side thereof with a larger inner diameter than the bore serving for the accommodation of the primer composition 4.
  • An offset or ledge 5 is produced thereby on which rests the insulating disk portion 2a.
  • the insulating cup portion 2b is constructed in one piere with the insulating disk portion 2a and forms as a whole the insulation generally designated by reference numeral 2.
  • the insulation 2 contains the pole piece 3 of conventional construction.
  • the flanged portion 6 serves for securing the pole piece 3 together with the insulation 2 in the case 1.
  • the assembly of the primer in accordance with the present invention takes place in the following manner:
  • the pole piece 3 is inserted into the insulation 2.
  • the insulating cup 2b is at that time still of cylindrical shape.
  • the flanging or beading operation producing the flange 6 only takes place after the installation of the insulation 2 together with the pole piece 3 into the case 1.
  • the primer composition 4 is subsequently pressed into the assembled completed primer.
  • An electrical primer operable according to the gapignition principle for igniting cartridges, shells, propellant charge containers and the like consisting essentially of: a tubular case haveing an internally extending annular case flange at one end, an internal ledge facing said case flange, and a portion of enlarged internal diameter between said case flange and said ledge; said flange, ledge and portion of reduced internal diameter defining an internally opening first annular groove within said case; an insulation member within said first annular groove; said insulation member having an insulating disc portion abutting said ledge, an integral insulating tubular portion abutting said portion of reduced internal diameter, and an integral insulating flange portion abutting said case flange; said insulating disc portion, insulating tubular portion and insulating flange portion defining an internally opening second annular groove within said insulating member; a disc shaped electrically conductive pole piece having an outer portion securely mounted within said second annular groove; said pole piece and said insulation member closing the said one
  • said frusto-conical tubular portion is an integral extension of said insulating flange portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Paints Or Removers (AREA)
  • Insulating Bodies (AREA)
US395469A 1963-09-12 1964-09-10 Electrical primer Expired - Lifetime US3286631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED42464A DE1280093B (de) 1963-09-12 1963-09-12 Elektrisches Zuendhuetchen

Publications (1)

Publication Number Publication Date
US3286631A true US3286631A (en) 1966-11-22

Family

ID=7046869

Family Applications (1)

Application Number Title Priority Date Filing Date
US395469A Expired - Lifetime US3286631A (en) 1963-09-12 1964-09-10 Electrical primer

Country Status (7)

Country Link
US (1) US3286631A (de)
AT (1) AT258171B (de)
BE (1) BE652843A (de)
CH (1) CH412678A (de)
DE (1) DE1280093B (de)
GB (1) GB1073518A (de)
NL (1) NL6410609A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644863A (en) * 1983-11-09 1987-02-24 Dynamit Nobel Aktiengesellschaft Electric detonator
US6487972B1 (en) 1997-12-11 2002-12-03 Ra Brands, Llc Electric primer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677803A (en) * 1950-09-12 1954-05-04 Wallace G Rork Proving process for primers of electrically fired ammunition
US2921520A (en) * 1953-06-18 1960-01-19 Donald M Stonestrom Detonator plug
US2974591A (en) * 1957-04-04 1961-03-14 Wasag Chemie Ag Fa Electric fuses for detonators and the like
US2986090A (en) * 1954-08-23 1961-05-30 Ernst H Doerpinghaus Electric fuses for igniting explosive charges
US3018732A (en) * 1954-09-30 1962-01-30 Bendix Corp Ignition means for ammunition primer or the like
US3090310A (en) * 1960-05-04 1963-05-21 George W Peet Conductive explosive primer mixture and device
US3125954A (en) * 1958-07-28 1964-03-24 Vilbajo

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1029266B (de) * 1956-02-27 1958-04-30 Dynamit Nobel Ag Elektrisches Zuendhuetchen fuer Patronen
CH379964A (de) * 1960-09-16 1964-07-15 Oerlikon Buehrle Ag Patronenzündelement mit Zündhütchen für elektrische Zündung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677803A (en) * 1950-09-12 1954-05-04 Wallace G Rork Proving process for primers of electrically fired ammunition
US2921520A (en) * 1953-06-18 1960-01-19 Donald M Stonestrom Detonator plug
US2986090A (en) * 1954-08-23 1961-05-30 Ernst H Doerpinghaus Electric fuses for igniting explosive charges
US3018732A (en) * 1954-09-30 1962-01-30 Bendix Corp Ignition means for ammunition primer or the like
US2974591A (en) * 1957-04-04 1961-03-14 Wasag Chemie Ag Fa Electric fuses for detonators and the like
US3125954A (en) * 1958-07-28 1964-03-24 Vilbajo
US3090310A (en) * 1960-05-04 1963-05-21 George W Peet Conductive explosive primer mixture and device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644863A (en) * 1983-11-09 1987-02-24 Dynamit Nobel Aktiengesellschaft Electric detonator
US6487972B1 (en) 1997-12-11 2002-12-03 Ra Brands, Llc Electric primer

Also Published As

Publication number Publication date
NL6410609A (de) 1965-03-15
BE652843A (de) 1964-12-31
GB1073518A (en) 1967-06-28
CH412678A (de) 1966-04-30
AT258171B (de) 1967-11-10
DE1280093B (de) 1968-10-10

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