US3415192A - Percussion cap and fuse and ordnance piece - Google Patents

Percussion cap and fuse and ordnance piece Download PDF

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Publication number
US3415192A
US3415192A US608225A US60822567A US3415192A US 3415192 A US3415192 A US 3415192A US 608225 A US608225 A US 608225A US 60822567 A US60822567 A US 60822567A US 3415192 A US3415192 A US 3415192A
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United States
Prior art keywords
striker
charge
bore
cap
percussion
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
US608225A
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English (en)
Inventor
Stadler Hans
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
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Dynamit Nobel AG
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Filing date
Publication date
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
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Publication of US3415192A publication Critical patent/US3415192A/en
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Classifications

    • 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
    • F42C19/10—Percussion caps

Definitions

  • INVENTORS HANS STADLER HEINZ GAWLICK HELLMUT BENDLER BY My ATTORNEYS- FIG 4 H B .I ⁇ k ⁇ V F IG; 3.
  • An ordnance piece such as a mortar shell is provided with a percussion cap having a bore characterized by including a length of large diameter, a length of small diameter and a ledged bore connecting said lengths. A charge is compacted in the bore and extends into the length of large diameter.
  • percussion caps of the prior art comprise a thin walled drawn metal capsule filled with the priming charge, having a floor with or without a striker hole that is covered by 'a thin foil.
  • the discharge opening is generally covered by a thin disk held on by crimping the edge of the capsule. Due to its slight wall thickness, the percussion cap is sensitive to mechanical stresses which are unavoidable during installation.
  • the operation of applying the cover disk by crimping is also a delicate one. This delicate character is only one of the disadvantages of the percussion caps of the prior art. Another important disadvantage lies in the fact that the priming charge is unsupported.
  • the principal object of the invention is the provision of a fuse in which the above-mentioned disadvantages are avoided.
  • a thick walled, turned or pressed cylindrical metal body serves to receive the priming charge, and has a ledged bore that narrows towards the discharge side, the ledge of the said bore serving as a supporting surface for the priming charge that is pressed into the said bore.
  • the new construction furthermore permits a design in which any eccentricity between the striker and the percussion cap that may develop in practice becomes harmless, in that the diameter of the bore on the striker side can be made approximately 2-5 times as great as the diameter of the striker. Even in the event of considerable axial deviation, proper firing is assured. Such proportioning provides suitable clearance.
  • the depth of the charge in the strike hole is to be such that the striker produces good ignition with the least possible energy.
  • a charge depth of 0.5 to 1.5 mm. is recommended.
  • a heavier priming charge may be required.
  • This requirement can be met in the case of percussion caps not subject to shock (used for example in land mines) if, according to the invention, the narrowed discharge bore leads on into an expanded bore, which can then receive a correspondingly larger priming charge.
  • the percussion cap can in this case be constructed symmetrically, i.e., with two relatively large bores at both ends and a restricted connecting passage. In this design the percussion cap can be installed with either end up.
  • the percussion cap of the invention is suitable for use in ordnance pieces including shells, bombs, fuses, and the like.
  • the invention provides an ordnance piece comprising a casin, a charge in the casing, and a percussion cap mounted for ignition of the charge.
  • the piece can include a striker for operation of the percussion cap.
  • the percussion cap comprises an elongated casing having a bore extending therethrough, and this bore includes a length of relatively large cross-sectional area, a length of relatively small cross-sectional area, and a ledge intermediate the bore lengths.
  • a percussion cap charge as is, known in the art, can be contained within the cap.
  • FIG. 1 and FIG. 2 are cross-section, elevation views of two percussion caps according to the invention
  • FIG. 3 is a cross-section, elevation view of a percussion cap according to the invention and showing a further modification of the construction;
  • FIG. 4 is a view corresponding to the showing in FIG. 3 but indicating the condition of the percussion cap during the striking thereof;
  • FIG. 5 is a view of a portion of an ordnance piece outfitted with a percussion cap according to the invention, the showing being in elevation and in cross-section.
  • FIG. 1, 1 designates the body of the percussion cap, which is made thick walled according to the invention by turning or pressing.
  • 4 is the striker, 2 the priming charge, and 3 a thin foil covering it.
  • bore 5 on the striker side is of relatively large cross-sectional area providing the enlarged portion 5a, and on the discharge side is of relatively small cross-sectional area providing the reduced portion 7.
  • the enlarged and reduced portions are joined by a ledge 6.
  • the ledge 6 is not at a right angle to the wall of the bore, but diverges from the reduced portion 7.
  • the priming charge 2 is sup ported against the ledge.
  • the diameter of the striker 4 is somewhat smaller than the diameter of discharge hole 7. It can also be somewhat larger than this diameter. In any case, the flash of the priming charge is largely blocked by striker 4 after the latter has fired it.
  • FIG. 2 is substantially the same as the one in FIG. 1, except that here the diameter of the striker 4 is substantially smaller than the diameter of passage 7.
  • an annular collar 8 is provided on striker 4, which is positioned and proportioned to engage the ledge 6, and to a great extent blocks the discharge passage 7 after firing.
  • the priming charge consists of two partial charges 2 and 9, charge 9 being especially adapted to the circumstances of the priming function.
  • the enlargement of the bore 2 accommodates 01f center position of the striker with respect to the bore.
  • the ratio of the diameter of the discharge hole 7 to the striker 4 can be in the range of about 120.5 to 1:2.
  • the outside diameter of the body part 1 can be 4 mm., or in the range of about 4-8 mm.; the height of the charge of percussion or priming material 2 can be 0.5 2.5 mm., for example 0.5-1.5 mm. for a cap with an outside diameter of 4 mm.
  • the diameter of the discharge hole 7 can be about 11.5 mm. and the wall thickness of this section can be 1.25 1.50 mm.
  • the wall thickness of the enlarged part of the bore can be substantially less but is preferably not less than of the outside diameter of the body part 1. For stronger material, thickness can be reduced provided stability of the ignition means is preserved.
  • the charge 2 is compacted, for example by compression of 2000-3000 kg/cm so that the particles adhere together.
  • FIGURES 3 and 4 show, in two different states, a percussion cap whose passage is enlarged both on the striker side and on the discharge side.
  • two lengths of large area are provided, one on either side of the length of small area.
  • the two large bores are connected to one another by the restricted passage 7, with ledges 6 and 6 on either side.
  • the cross-sections of the enlarged length portions are the same, and the priming charge is symmetrically constructed so that it can be installed with either end up.
  • FIG. 4 shows the primer during the firing.
  • the ledge 6 disposed adjacent the striker 4 diverges from the length 7, which is of relatively small cross-sectional area, to the length a which is of relatively large cross-sectional area, and the striker 4 has a pointed end portion 4a providing a tip for receipt in the small bore 7, and further the end portion has a rear portion for seating on the ledge 6.
  • the composition 2 can be a percussion or primer composition
  • the composition 9 can be a delay or expeller composition.
  • the two compositions can be as follows- Percussion charge: Percent 1-(5tetrazolyl)-4-guanyl-tetrazene-hydrate 7 Lead trinitro resorcinate 30 Potassium chlorate 20 Sulfur antimony Quartz powder 33 Expeller charge: Percent Lead trinitro resorcinate 65 Calcium silicide 1S Barium nitrate A cap as is shown in FIG. 3, containing a single composition has the advantage of being adaptable to insertion 6 either end first.
  • the composition can be as follows:
  • an ordnance piece comprising a casing 11 contains an explosive composition or delay composition 13 housed in inner sleeve 12, and a percussion cap 14, according to the invention, is positioned at the end of the charge 12, in known manner.
  • the ordnance piece also includes a striker 15 for operation of the percussion cap in known manner.
  • Ordnance piece comprising a percussion cap having an elongated casing having a bore extending therethrough, said bore including a length of relatively large crosssectional area, a length of relatively small cross-sectional area and a ledged bore intermediate said lengths diverging from the length of small area to the length of large area, and percussion cap charge composed of particles compacted in said bore so that the particles adhere together, said charge filling the ledge bore and extending therefrom into the length of large cross-sectional area and the length of small cross-sectional area, said piece further comprising a charge for ignition by the cap, the cap being disposed adjacent one end of the charge with the length of relatively large cross-sectional area disposed outwardly from the charge.
  • said bore including a second length of relatively large cross-sectional area, said second length being disposed across the length of small area from the first-mentioned length of relatively large area, the construction of the cap being symmetrical with respect to the length of relatively small cross-sectional area permitting installation of the percussion cap in the ordnance piece either end first.
  • the diameter of hte length of relatively large cross-section being about 25 times the diameter of the striker.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Air Bags (AREA)
US608225A 1962-11-29 1967-01-09 Percussion cap and fuse and ordnance piece Expired - Lifetime US3415192A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED40378A DE1177041B (de) 1962-11-29 1962-11-29 Zuendkapsel fuer Anstichzuendung

Publications (1)

Publication Number Publication Date
US3415192A true US3415192A (en) 1968-12-10

Family

ID=7045356

Family Applications (1)

Application Number Title Priority Date Filing Date
US608225A Expired - Lifetime US3415192A (en) 1962-11-29 1967-01-09 Percussion cap and fuse and ordnance piece

Country Status (7)

Country Link
US (1) US3415192A (de)
AT (1) AT265918B (de)
BE (1) BE640476A (de)
CH (1) CH406939A (de)
DE (1) DE1177041B (de)
GB (1) GB1065328A (de)
NL (1) NL300729A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658900A (en) * 1985-06-06 1987-04-21 Baker Oil Tools, Inc. High energy firing head for well perforating guns
US5763816A (en) * 1996-07-26 1998-06-09 Slurry Explosive Corporation Explosive primer
US5799977A (en) * 1994-06-27 1998-09-01 Nippon Koki Co., Ltd. Gas generator for seat belt retracting power generating device
US20030019384A1 (en) * 2001-07-17 2003-01-30 Voreck Wallace E. Detonator
US9322625B1 (en) 2011-10-24 2016-04-26 F. Richard Langner Systems and methods for launching water from a disrupter cannon
US10976144B1 (en) 2018-03-05 2021-04-13 Vista Outdoor Operations Llc High pressure rifle cartridge with primer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189614000A (en) * 1896-06-24 1897-05-29 Alfred Vincent Newton Improvements in War Rockets.
US2973713A (en) * 1957-12-31 1961-03-07 Phillips Petroleum Co Ignition of solid rocket propellants

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR507544A (fr) * 1919-06-09 1920-09-17 Baltasar Fargas De Casanovas Perfectionnements dans les fusées à temps
US2857847A (en) * 1954-10-13 1958-10-28 Olin Mathieson Detonators
NL114022C (de) * 1959-11-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189614000A (en) * 1896-06-24 1897-05-29 Alfred Vincent Newton Improvements in War Rockets.
US2973713A (en) * 1957-12-31 1961-03-07 Phillips Petroleum Co Ignition of solid rocket propellants

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658900A (en) * 1985-06-06 1987-04-21 Baker Oil Tools, Inc. High energy firing head for well perforating guns
US5799977A (en) * 1994-06-27 1998-09-01 Nippon Koki Co., Ltd. Gas generator for seat belt retracting power generating device
US5763816A (en) * 1996-07-26 1998-06-09 Slurry Explosive Corporation Explosive primer
US20030019384A1 (en) * 2001-07-17 2003-01-30 Voreck Wallace E. Detonator
US7546805B2 (en) * 2001-07-17 2009-06-16 Schlumberger Technology Corporation Detonator
US9322625B1 (en) 2011-10-24 2016-04-26 F. Richard Langner Systems and methods for launching water from a disrupter cannon
US10976144B1 (en) 2018-03-05 2021-04-13 Vista Outdoor Operations Llc High pressure rifle cartridge with primer
US11609077B2 (en) 2018-03-05 2023-03-21 Vista Outdoor Operations Llc High pressure rifle cartridge with primer

Also Published As

Publication number Publication date
DE1177041B (de) 1964-08-27
AT265918B (de) 1968-10-25
NL300729A (de)
CH406939A (de) 1966-01-31
GB1065328A (en) 1967-04-12
BE640476A (de) 1964-03-16

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