US3427972A - Electrically ignited primer element - Google Patents

Electrically ignited primer element Download PDF

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Publication number
US3427972A
US3427972A US583153A US3427972DA US3427972A US 3427972 A US3427972 A US 3427972A US 583153 A US583153 A US 583153A US 3427972D A US3427972D A US 3427972DA US 3427972 A US3427972 A US 3427972A
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US
United States
Prior art keywords
recess
primer composition
shaped
gap
cup
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
US583153A
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English (en)
Inventor
Hans Stadler
Heinz Gawlick
Hans Umbach
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 US3427972A publication Critical patent/US3427972A/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
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/11—Initiators therefor characterised by the material used, e.g. for initiator case or electric leads
    • 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
    • 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
    • F42C19/14—Primers; Detonators electric operable also in the percussion mode

Definitions

  • the present invention proposes to make the primer composition carrier from the thermoplastic material, for example, polyethylene, polycarbonate, polyamide, or polystyrene.
  • the conductors of the present invention are formed from a U-shaped staple-like member having leg portions driven from the inside outwardly through the bottom of the primer composition cup-shaped carrier and bent to the same or opposite side. Thereafter, the bridging portion of the U-shaped member is severed to form two L-shaped members having aligned legs forming a gap and encased in the primer composition.
  • thermoplastic or other insulating primer composition carrier eliminates the usual insulation problems and allows the simple inexpensive attachment of the conductors in a manner analogous to the impact driving of a staple by a gun or other machine.
  • the leg portions emerging from the bottom of the cup-shaped carrier are bent to one side by appropriate ly shaped recesses in an anvil type back-up plate supporting the bottom of the cup-shaped carrier.
  • the separation of the bridging portion may be accomplished by a mill or other appropriate cutting tool, or a knife-like element, which may, press the separated ends into the bottom of the cup-shaped primer composition carrier to firmly anchor the conductors.
  • the gap may be in the center or outside area of the cup-shaped carrier; however, the gap must be arranged so that the igniting current will flow through the electrically conductive primer composition, which is forced into the gap after the separation, from one conductor to the other. It is contemplated that only the gap or gap area may be filled with electrically conducted primer compositions so that the majority of the primer composition may be nonconductive.
  • the primer composition may be coated with a lacquer or other similar material.
  • the interior of the cup-shaped member may be formed with a downwardly and outwardly extending wall portion to securely hold the primer composition within the cup-shaped member.
  • the interior of the cup-shaped carrier may be formed with a quadrangular, star-shaped, or other noncircular primer composition containing recess.
  • FIGURE 1 is an axial cross-sectional view through a primer element according to the present invention, Wherein the outside ends of the conductors are bent toward one side and there is a centrally arranged gap between the conductors;
  • FIGURE 2 is a top plan view of the primer element according to FIGURE 1, with the primer composition removed for purposes of illustration to show the circular shape of the primer composition recess;
  • FIGURE 3 is a top plan view similar to FIGURE 2, of another embodiment of the present invention having a quadrangular primer composition recess;
  • FIGURE 4 is an axial cross-sectional view through another embodiment of the present invention secured in the lower portion of a cartridge case, with portions of the cartridge case omitted for purposes of illustration;
  • FIGURE 5 is a top plan view of the primer element according to FIGURE 4, showing the circular primer composition recess;
  • FIGURE 6 is a top plan view similar to FIGURE 5, of another embodiment of the present invention having a star-shaped primer composition recess;
  • FIGURE 7 is an axial cross-sectional view of an additional embodiment of the present invention.
  • FIGURE 8 is an axial cross-sectional view of a further embodiment of the primer element according to the present invention.
  • the cupshaped primer composition carrier or bottom piece 1 has a bottom portion 2 receiving the legs 5 and 5" of the U-shaped staple-like member, which has been severed at its bridging portion to form a gap 3 between the two conductors or leg portions 5' and 5".
  • the end portions of the thus formed aligned legs of the L-shaped members adjacent the gap 3 are bent over into the bottom 2 of the cup-shaped carrier 1.
  • the gap 3 is centrally located within the primer composition recess 4, which communicates with radially extending oppositely disposed slots 7 and a widened upper portion 4a; the gap 3, recess 4, slots 7, and widened upper portion 4a are filled with the electrically conductive primer composition 6.
  • the widened upper portion- 4a may be filled with a non-conductive primer composition.
  • the cupshaped carrier 1 is formed with an annular flange 8, which will abut with the rear end of the cartridge case or, additionally, the cartridge chamber wall.
  • the primer composition recess 4 is substantially cylindrical.
  • FIGURE 3 The embodiment of the present invention according to FIGURE 3 is identical to the embodiment of FIGURE 1, except that the recess 4 is quadrangular to increase the adherence between the primer composition and the cupshaped member 1. Also, it is contemplated that the widened upper portion 4a in either FIGURE 1 or FIG- URE 3 may have a non-circular shape.
  • the cup-shaped carrier has an outer recessed area 10 for receiving the bent over ends of the conductors 5' and 5, which have been inserted in the same manner as FIGURE 1; the outer end of the conductors are flush with the rear end face 11 of the cupshaped carrier 1.
  • the primer composition recess 4 is frusto-conical in shape to securely hold the primer composition 6 within the cupshaped carrier 1.
  • the forward end of the cup-shaped member 1 has an annular reinforcement 14 for snapengagement with a correspondingly shaped annular groove 15 within a cartridge case 13, which is filled with a propellant charge 12 to form a propellant cartridge for use in a bolt-setting device, for example.
  • the cup-shaped carrier 1 is provided with a flange 8 to support the cupshaped carrier 1 against the rear end face 16 of the cartridge case 13 and to support the cartridge within a cartridge chamber. It is contemplated that the flange could be formed on the outer end portion of the cartridge case 13.
  • the cup-shaped member 1 is provided with a bottom portion 2 and slots 7, similar to the correspondingly numbered parts in FIGURE 1.
  • the flange 8 may be flattened at 17 to provide locating surfaces for aligning the conductors in a cartridge chamber.
  • FIGURE 6 is identical to the embodiment of FIGURES 4 and 5, except that the recess 4 is star-shaped. As shown by the dotted lines, the recess 4 is tapered toward the forward end, in a manner similar to the recess 4 of FIGURE 4.
  • the primer element of FIGURE 7 is constructed similar to the primer element of FIGURE 1, with correspondingly'numbered elements.
  • the recess 4 is constructed eccentrically with respect to the cup-shaped carrier 1 and the gap 3 formed by the conductors 5 and 5" is eccentrically located within the recess 4.
  • the innermost ends of the conductors 5 and 5" are bent toward bottom portion 2 to form a secure attachment, but do not engage the bottom portion 2.
  • FIGURE 8 is similar to the preceding embodiments with correspondingly numbered elements.
  • the conductors 5 and 5 are forced into the bottom portion 2, as in the previously described embodiment of FIGURE 1.
  • the transition portions between the bridging portion and the leg portions freely project into the primer composition 6.
  • the outermost ends of the conductors 5' and 5" are bent over to project radially outwardly toward opposite sides; with this construction it may not be necessary to have a specific orientation within the cartridge chamber.
  • the recess 4 is forwardly tapered and extends to the forwardmost portion of the cup-shaped carrier 1.
  • a gap-type electrically ignited primer element comprising: a bottom piece constructed of an insulating material, two electrically conductive substantially L-shaped members with two legs; each of said members having one leg substantially aligned with and the other leg substantially parallel with corresponding legs of the other member; said aligned legs having inner free ends displaced transversely from alignment with respect to each other forming a gap adjacent to the inner portion of said bottom piece; said one leg having a total length substantially equal to the spacing between said other legs at their ends adjacent said one leg.
  • said bottom piece has opposed substantially radially extending slots communicating with said recess and containing the radially outer portions of said aligned legs, said slots are eccentric with respect to the axis of said bottom piece, and said recess is substantially cylindrical and centrally located with respect to said axis.
  • said recess includes a rearward gap-containing portion, a widened forward portion, and a shoulder portion connecting said rearward and forward portions; and said bottom portion having an outwardly radially extending flange at its rearward end; said parallel legs having free outer ends bent back toward said bottom piece and said free outer ends being bent in the same direction.
  • said bottom piece is a synthetic plastic substantially cup-shaped member having a primer composition recess, and the gap is located within said recess.
  • the device of claim 5 including an electrically conductive primer composition within said recess and filling said gap.
  • said bottom piece has a centrally located projection forwardly extending into said recess; the inner free ends of said members that formed the gap being bent toward and embedded in said projection; the parallel legs of said members being radially spaced a substantial distance from said projection to form a substantial space between the bottom piece and the junction of the legs for each member.
  • said bottom piece has an annular reinforcing rib portion at its forward end, and including a substantially tubular cartridge case having a correspondingly shaped inner annular groove forming a snap connection with said reinforcing rib portion, and said bottom portion having an outwardly radially extending flange at its rearward end.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Air Bags (AREA)
US583153A 1965-06-04 1966-06-06 Electrically ignited primer element Expired - Lifetime US3427972A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED47434A DE1280094B (de) 1965-06-04 1965-06-04 Zuendelement fuer elektrische Zuendung

Publications (1)

Publication Number Publication Date
US3427972A true US3427972A (en) 1969-02-18

Family

ID=7050427

Family Applications (1)

Application Number Title Priority Date Filing Date
US583153A Expired - Lifetime US3427972A (en) 1965-06-04 1966-06-06 Electrically ignited primer element

Country Status (4)

Country Link
US (1) US3427972A (enrdf_load_stackoverflow)
BE (1) BE682037A (enrdf_load_stackoverflow)
DE (1) DE1280094B (enrdf_load_stackoverflow)
GB (1) GB1131877A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828677A (en) * 1973-06-11 1974-08-13 Us Army Electric ignition element with secondary ignition capability
US5044278A (en) * 1989-07-03 1991-09-03 James E. Meagher Electrically ignitible cartridge system
CN108317918A (zh) * 2018-03-29 2018-07-24 贵州盘江民爆有限公司 全自动电子雷管卡口、检测、赋码、激光编码生产线

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2551473C2 (de) * 1975-11-15 1983-10-20 Diehl GmbH & Co, 8500 Nürnberg Zündelement für Munition

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US112859A (en) * 1871-03-21 Improvement in electric fuses
US128945A (en) * 1872-07-16 Improvement in electric fuses
US319628A (en) * 1885-06-09 samuel eussell
US323974A (en) * 1885-08-11 thompson
US426971A (en) * 1890-04-29 Hugo tirmann
US815490A (en) * 1905-11-01 1906-03-20 Frank Fishel Electrical gun.
DE1029266B (de) * 1956-02-27 1958-04-30 Dynamit Nobel Ag Elektrisches Zuendhuetchen fuer Patronen
US3059576A (en) * 1958-09-26 1962-10-23 Conax Corp Electrically fired detonator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL295876A (enrdf_load_stackoverflow) * 1962-08-01

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US112859A (en) * 1871-03-21 Improvement in electric fuses
US128945A (en) * 1872-07-16 Improvement in electric fuses
US319628A (en) * 1885-06-09 samuel eussell
US323974A (en) * 1885-08-11 thompson
US426971A (en) * 1890-04-29 Hugo tirmann
US815490A (en) * 1905-11-01 1906-03-20 Frank Fishel Electrical gun.
DE1029266B (de) * 1956-02-27 1958-04-30 Dynamit Nobel Ag Elektrisches Zuendhuetchen fuer Patronen
US3059576A (en) * 1958-09-26 1962-10-23 Conax Corp Electrically fired detonator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828677A (en) * 1973-06-11 1974-08-13 Us Army Electric ignition element with secondary ignition capability
US5044278A (en) * 1989-07-03 1991-09-03 James E. Meagher Electrically ignitible cartridge system
CN108317918A (zh) * 2018-03-29 2018-07-24 贵州盘江民爆有限公司 全自动电子雷管卡口、检测、赋码、激光编码生产线
CN108317918B (zh) * 2018-03-29 2024-03-22 贵州盘江民爆有限公司 全自动电子雷管卡口、检测、赋码、激光编码生产线

Also Published As

Publication number Publication date
BE682037A (enrdf_load_stackoverflow) 1966-11-14
GB1131877A (en) 1968-10-30
DE1280094B (de) 1968-10-10

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