US2446187A - Lined igniter-charge tube - Google Patents

Lined igniter-charge tube Download PDF

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Publication number
US2446187A
US2446187A US697617A US69761746A US2446187A US 2446187 A US2446187 A US 2446187A US 697617 A US697617 A US 697617A US 69761746 A US69761746 A US 69761746A US 2446187 A US2446187 A US 2446187A
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Prior art keywords
igniter
tube
thimble
charge
charge tube
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Expired - Lifetime
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US697617A
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Leo T Meister
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    • 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
    • F42C19/0823—Primers or igniters for the initiation or the propellant charge in a cartridged ammunition
    • F42C19/0826—Primers or igniters for the initiation or the propellant charge in a cartridged ammunition comprising an elongated perforated tube, i.e. flame tube, for the transmission of the initial energy to the propellant charge, e.g. used for artillery shells and kinetic energy penetrators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/4994—Radially expanding internal tube

Definitions

  • An object of the invention is to provide an ammunition primer in which the igniter-charge, contained within the igniter-charge tube or body of the primer, is effectively sealed therein against the harmful influencesof air, gases or liquids.
  • Another object of the invention is to provide an ammunition primer in which the interior liner for the igniter-charge tube is formed of a fusible thin-walled metallic seamless tube closed at one end.
  • a further object of the invention is the provision of a primer in which the liner, at or near its open end, is attached to the interior wall of the igniting-charge tube by an air-tight connection.
  • a still further object is to provide the liner of a fusible material such that it will intimately bond itself to the primer upon the application of heat.
  • a method of manufacturing the primer is disclosed in application Serial No. 592,433, filed May 7, 1945, of which the present application is a division.
  • Figure 1 is a side view of a primer according to the present invention.
  • Figure 2 is a longitudinal central section of the primer taken on line 2-2 of Figure 1;
  • Figure 4 is a cross section taken through line 4-4 of Figure 1.
  • An igniter-charge tube 5 has at its firing end a head 6 which contains the usual percussion elements, not shown, and is threadedly attached to the igniter-charge tube 5 through screw threads 1 within the igniter tube 5. The threaded engagement between the tube 5 and the head 6 is sufficient to effect an air-tight connection.
  • the igniter-charge tube 5 is provided with a number of vents or flame holes 8 for the passage of flame arising from the igniter-charge within the tube 5 when the primer is fired.
  • the igniter-charge tube 5 is advantageously made of brass and has located therein a thinwalled lead-tin alloy liner ID.
  • This tube or liner Ill may be formed from a disk or slug of metal by drawing operations involving the use of a punch and die, more or less in the same manner as cartridge cases are drawn from disks or cups of brass.
  • the tube or liner I0 is seamless and has a closed and. an open end. As it resembles an elongated sewing thimble having cylindricalwalls, the tube or liner I0 is referred to herein and in the appended claims as thimbles.
  • thimbles may be made of any easily fusible suitable metal which is subject to plastic flow in drawing and which may be cemented or soldered within the igniter-charge tube, as hereinafter more fully appears.
  • These thimbles are advantageously formed of tin or lead, or-alloys of tin or lead, such as for example, an alloy consisting of 50% lead and 50% tin, or lead and 40% tin.
  • thimbles are considered as being made of or drawn from an alloy consisting of 60% lead and 40% tin; it being understood, however, that the invention is not confined to the use of this particular metal or alloy, as will be understood by the person skilled in the art. In practice, thimbles formed of alloys of lead and tin have proved to be very satisfactory.
  • the thimble l0 fits closely within the interior of the igniter-charge tube 5, covering all of the flame holes 8 thereof, with the closed end portions of the thimble l0 and the tube end ll positioned adjacent each other and the open end of thimble l0 adjacent the imperforate portion of the igniter tube 5 located between the screw threads 1 and the openings nearest the said screw threads.
  • Thimble I0 is inserted within the igniter-charge tube 5, as shown in Figure 2, and firmly pressed against the interior wall and closed end ll of the igniter-charge tube 5 in any suitable manner, or as described in'thc forementioned parent application Serial No. 592,433.
  • soldering flux Prior to inserting the thimble 10 into the igniter tube 5, soldering flux is applied around the thimble ill at the open end thereof.
  • This flux which is preferably a non-acid flux, extends around the thimble and along the length thereof for a short distance, for example a quarter or a half inch, from the open end of the thimble toward its closed end as diagrammatically indicated by S in Figure 3.
  • the soldering flux lies between the wall of the thimble near its open end and the interior imperforate portion of the igniter-charge tube 5.
  • the soldering action extends completely around the thimble at or near the open end thereof, forming a gas-tight connection between the walls of the thimble near its 'open end and the adjacent imperforate portions-of the igniter-charge tube 5 and the remainder of the walls of the thimble remain unattached to, but pressed against, the interior wallsofthe igniter-charge tube 5.
  • a powder charge is inserted into the thimble I0, after it has been soldered into position, and theheadfi-containing the percussion elements, not shown, is screwed into tight engagement with the screw threads 1.
  • the primer is :now ready for use in connection with fixed, semi-fixed or separate loading ammunition and upon the percussion elements in the headfi being struck aflame is produced whichignites the powder charge within the fusible srthimble Ill. The burning of this igniter charge produces aflame which melts the fusible thimble l0 andissues forth from the openings flitoignite theexplosive or propellent charge with which the primer herein-described is-used.
  • the thimble lfl -maybe formed of any metal that isreadily-fusibleby the heat or flame produced by the burning of the ig'niter charge and which can be soldered to the igniter .charge'tube 5.
  • the exterior walls of the thimble near its open .end are tinned, in a manner well known to the art, with an appropriate solder and the tinned .portioncoated with a soldering flux prior to inserting the-thimble within the igniter-charge tube Band then applying heatas explained above.
  • thimbles formed .wholly or in part of tin, or comprising tin as a component of the metal thereof is that theprodnote from the destruction of the thimble bythe burning of the igniter charge promotes or causes .de-coppering of the bore or cannon.
  • Thimbles made of softmetals such as tin or lead, oralloys thereof, are particularly advantageous in that ,end-of the thimble begins to melt.
  • they may be made slightly smaller than the interior of the igniter-charge tube 5 and stretched or expanded into position to snugly fit against the interior wall of the igniter-charge tube 5.
  • a primer comprising a tube having an open and a closed end with the walls of said primer having a portion of the length thereof imperforate and the remainder of the length perforated,a thin-walled thimble of solder alloy in said tubehaving an open and a closed end adjacent corresponding ends of said tube, said thimble being secured to said tube'at theimperforate portion thereof by said solder alloy and unattached to but against, the perforated portions of said tube.
  • a primer comprising'a tube closed at one end'and having flame openingsiin its wall, a thinwalled metallic thimble within the tube with the closed end of the thimble adjacent the closed end 'ofv said tube, and the said thimble at lts open end being soldered to the interior Wall *of said tube.
  • a primer comprising-anigniter-charge tube closed at one end and having flame openings in its wall, a'thin-walledlead-tin alloy thimble within the said tube with the'closed end-of the thimble adjacent the closed end of said tube, and the said thimble at its open --end being soldered to said tube.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Description

'Aug. 3, 1948. T, MEISTER 2,446,187
LINED IGNITER- CHARGE TUBE Original Filed May 7, 1945 grwwwtm LEEIT Mela-FER,
Patented Aug. 3, 1948 LINED IGNITER-CHARGE TUBE Leo T. Meister, Hillside, N. J.
Original application May 7, 1945, Serial No.
592,433. Divided and this application September .18, 1945, Serial No. 697,617
3 Claims. (or. 102-865) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.
The present invention relates to ammunition primers, particularly to the igniter tubes thereof.
An object of the invention is to provide an ammunition primer in which the igniter-charge, contained within the igniter-charge tube or body of the primer, is effectively sealed therein against the harmful influencesof air, gases or liquids.
Another object of the invention is to provide an ammunition primer in which the interior liner for the igniter-charge tube is formed of a fusible thin-walled metallic seamless tube closed at one end.
A further object of the invention is the provision of a primer in which the liner, at or near its open end, is attached to the interior wall of the igniting-charge tube by an air-tight connection.
A still further object is to provide the liner of a fusible material such that it will intimately bond itself to the primer upon the application of heat.
A method of manufacturing the primer is disclosed in application Serial No. 592,433, filed May 7, 1945, of which the present application is a division.
Reference is made to the following description and accompanying drawing in which:
Figure 1 is a side view of a primer according to the present invention;
Figure 2 is a longitudinal central section of the primer taken on line 2-2 of Figure 1;
Figure 3 is an enlarged=fragmentary central longitudinal sectional view of the primer illustrating the joint between the liner and the igniter charge tube; and
Figure 4 is a cross section taken through line 4-4 of Figure 1.
An igniter-charge tube 5 has at its firing end a head 6 which contains the usual percussion elements, not shown, and is threadedly attached to the igniter-charge tube 5 through screw threads 1 within the igniter tube 5. The threaded engagement between the tube 5 and the head 6 is sufficient to effect an air-tight connection. The igniter-charge tube 5 is provided with a number of vents or flame holes 8 for the passage of flame arising from the igniter-charge within the tube 5 when the primer is fired.
The igniter-charge tube 5 is advantageously made of brass and has located therein a thinwalled lead-tin alloy liner ID. This tube or liner Ill may be formed from a disk or slug of metal by drawing operations involving the use of a punch and die, more or less in the same manner as cartridge cases are drawn from disks or cups of brass. The tube or liner I0 is seamless and has a closed and. an open end. As it resembles an elongated sewing thimble having cylindricalwalls, the tube or liner I0 is referred to herein and in the appended claims as thimbles.
These thimbles may be made of any easily fusible suitable metal which is subject to plastic flow in drawing and which may be cemented or soldered within the igniter-charge tube, as hereinafter more fully appears. These thimbles are advantageously formed of tin or lead, or-alloys of tin or lead, such as for example, an alloy consisting of 50% lead and 50% tin, or lead and 40% tin.
In the further description which follows, the thimbles are considered as being made of or drawn from an alloy consisting of 60% lead and 40% tin; it being understood, however, that the invention is not confined to the use of this particular metal or alloy, as will be understood by the person skilled in the art. In practice, thimbles formed of alloys of lead and tin have proved to be very satisfactory.
The thimble l0 fits closely within the interior of the igniter-charge tube 5, covering all of the flame holes 8 thereof, with the closed end portions of the thimble l0 and the tube end ll positioned adjacent each other and the open end of thimble l0 adjacent the imperforate portion of the igniter tube 5 located between the screw threads 1 and the openings nearest the said screw threads. Thimble I0 is inserted within the igniter-charge tube 5, as shown in Figure 2, and firmly pressed against the interior wall and closed end ll of the igniter-charge tube 5 in any suitable manner, or as described in'thc forementioned parent application Serial No. 592,433.
Prior to inserting the thimble 10 into the igniter tube 5, soldering flux is applied around the thimble ill at the open end thereof. This flux, which is preferably a non-acid flux, extends around the thimble and along the length thereof for a short distance, for example a quarter or a half inch, from the open end of the thimble toward its closed end as diagrammatically indicated by S in Figure 3. Thus, the soldering flux lies between the wall of the thimble near its open end and the interior imperforate portion of the igniter-charge tube 5.
Localized heat of suflicient intensity is applied, as suggested by the forementioned parent application Serial No. 592,433, to that area of the igniter-charge tube 5 near the open end of the thimble ID. The cylindrical wall of the thimble melts during the heating, for an approximate length corresponding to the distance S of Figure 3, and owing to the fact that the thimble is made of a material which is a solder, it becomes soldered --to "15118 interior wall of the ignitercharge tube 5 upon cooling after the removal of the=described heating. The soldering action extends completely around the thimble at or near the open end thereof, forming a gas-tight connection between the walls of the thimble near its 'open end and the adjacent imperforate portions-of the igniter-charge tube 5 and the remainder of the walls of the thimble remain unattached to, but pressed against, the interior wallsofthe igniter-charge tube 5.
In loading the primer, a powder charge is inserted into the thimble I0, after it has been soldered into position, and theheadfi-containing the percussion elements, not shown, is screwed into tight engagement with the screw threads 1. The primer is :now ready for use in connection with fixed, semi-fixed or separate loading ammunition and upon the percussion elements in the headfi being struck aflame is produced whichignites the powder charge within the fusible srthimble Ill. The burning of this igniter charge produces aflame which melts the fusible thimble l0 andissues forth from the openings flitoignite theexplosive or propellent charge with which the primer herein-described is-used.
:Asis'clear to those skilled in the art, the thimble lfl,-maybe formed of any metal that isreadily-fusibleby the heat or flame produced by the burning of the ig'niter charge and which can be soldered to the igniter .charge'tube 5. Arfeature contained in the embodiment of the present :in Mention resides in the useof a materialfor-the thim'be Ill -which provides its own solder for soldering the thimble at its upper end to the igniter-charge tube 5. In the event that the thimble lu is formed of a metal which .does not function as a solder, or when it is-desirable to .form a soldered joint in the customary manner, the exterior walls of the thimble near its open .end are tinned, in a manner well known to the art, with an appropriate solder and the tinned .portioncoated with a soldering flux prior to inserting the-thimble within the igniter-charge tube Band then applying heatas explained above.
.A furtheriadvantagein using thimbles formed .wholly or in part of tin, or comprising tin as a component of the metal thereof, is that theprodnote from the destruction of the thimble bythe burning of the igniter charge promotes or causes .de-coppering of the bore or cannon. Thimbles made of softmetals such as tin or lead, oralloys thereof, are particularly advantageous in that ,end-of the thimble begins to melt.
they may be made slightly smaller than the interior of the igniter-charge tube 5 and stretched or expanded into position to snugly fit against the interior wall of the igniter-charge tube 5.
This, of :course .facilitates .and insures efiective soldering fin thatuponapplication of .heat, and due to the walls of the thimble near its open end being in such close relation with the interior walls of the igniter-charge tube 5, soldering takes place practically at the instant that the open The solder from the melting end of the thimble immediately wets the adjacent interior walls of the ignitercharge tube 5 and upon removal of the heat, a gas-tight joint'is formed.
I claim:
1. A primer comprising a tube having an open and a closed end with the walls of said primer having a portion of the length thereof imperforate and the remainder of the length perforated,a thin-walled thimble of solder alloy in said tubehaving an open and a closed end adjacent corresponding ends of said tube, said thimble being secured to said tube'at theimperforate portion thereof by said solder alloy and unattached to but against, the perforated portions of said tube.
2. A primer comprising'a tube closed at one end'and having flame openingsiin its wall, a thinwalled metallic thimble within the tube with the closed end of the thimble adjacent the closed end 'ofv said tube, and the said thimble at lts open end being soldered to the interior Wall *of said tube.
3. A primer comprising-anigniter-charge tube closed at one end and having flame openings in its wall, a'thin-walledlead-tin alloy thimble within the said tube with the'closed end-of the thimble adjacent the closed end of said tube, and the said thimble at its open --end being soldered to said tube.
LEO T. MEISTER.
REFERENCES CITED Piccard Mar. 14, 1933 Meister -Aug. 5, 1947 FOREIGN PATENTS Country Date Great Britain 1884 Number Number
US697617A 1945-05-07 1946-09-18 Lined igniter-charge tube Expired - Lifetime US2446187A (en)

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US592433A US2455380A (en) 1945-05-07 1945-05-07 Method of manufacturing primers
US697617A US2446187A (en) 1945-05-07 1946-09-18 Lined igniter-charge tube

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US592433A US2455380A (en) 1945-05-07 1945-05-07 Method of manufacturing primers
US697617A US2446187A (en) 1945-05-07 1946-09-18 Lined igniter-charge tube

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592623A (en) * 1948-02-16 1952-04-15 Norman K Turnbull Primer assembly for artillery ammunition
US3003419A (en) * 1960-06-06 1961-10-10 Mimx Corp Rod-type pyrogenic igniter
FR2325900A1 (en) * 1975-09-27 1977-04-22 Rheinmetall Gmbh PRIMING CHAIN
US4495866A (en) * 1981-12-28 1985-01-29 Dynamit Nobel Aktiengesellschaft Flash guide tube arrangement for propellant charge igniters
EP0364833A1 (en) * 1988-10-15 1990-04-25 DIEHL GMBH & CO. Projectile comprising an ejecting charge
EP0822385A1 (en) * 1996-08-02 1998-02-04 Rheinmetall Industrie Aktiengesellschaft Primer for propulsive charge
US6302008B1 (en) * 1997-09-03 2001-10-16 Rheinmetall W&M Gmbh Process of producing a propellant charge igniter
US6857370B1 (en) * 2002-04-10 2005-02-22 General Dynamics Ordnance And Tactical Systems, Inc. Primer body
EP1577634A1 (en) * 2004-03-17 2005-09-21 Rheinmetall Waffe Munition GmbH Igniter for propulsive charge
DE102009052660A1 (en) 2008-11-13 2010-05-20 Ruag Ammotec Gmbh Pyrotechnic igniter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2583316A (en) * 1947-12-09 1952-01-22 Clyde E Bannister Method and apparatus for setting a casing structure in a well hole or the like

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US399879A (en) * 1889-03-19 James weir graydon
US895412A (en) * 1906-01-02 1908-08-11 Arthur C Badger Method of forming compound receptacles.
US1901469A (en) * 1932-05-12 1933-03-14 Hercules Powder Co Ltd Blasting cap
US2424993A (en) * 1944-04-19 1947-08-05 Meister Leo Sealing flash holes of primers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1313801A (en) * 1919-08-19 James a
US714903A (en) * 1898-02-17 1902-12-02 Robert Lewis Process of lining pipes.
US776952A (en) * 1902-02-27 1904-12-06 Richard Victor Skowronek Process of securing metal coverings upon pipes.
US1755416A (en) * 1927-03-10 1930-04-22 Wacho Mfg Company Method of forming tanks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US399879A (en) * 1889-03-19 James weir graydon
US895412A (en) * 1906-01-02 1908-08-11 Arthur C Badger Method of forming compound receptacles.
US1901469A (en) * 1932-05-12 1933-03-14 Hercules Powder Co Ltd Blasting cap
US2424993A (en) * 1944-04-19 1947-08-05 Meister Leo Sealing flash holes of primers

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592623A (en) * 1948-02-16 1952-04-15 Norman K Turnbull Primer assembly for artillery ammunition
US3003419A (en) * 1960-06-06 1961-10-10 Mimx Corp Rod-type pyrogenic igniter
FR2325900A1 (en) * 1975-09-27 1977-04-22 Rheinmetall Gmbh PRIMING CHAIN
US4495866A (en) * 1981-12-28 1985-01-29 Dynamit Nobel Aktiengesellschaft Flash guide tube arrangement for propellant charge igniters
EP0364833A1 (en) * 1988-10-15 1990-04-25 DIEHL GMBH & CO. Projectile comprising an ejecting charge
US5000095A (en) * 1988-10-15 1991-03-19 Diehl Gmbh & Co. Projectile with an ejecting charge
EP0822385A1 (en) * 1996-08-02 1998-02-04 Rheinmetall Industrie Aktiengesellschaft Primer for propulsive charge
US5895881A (en) * 1996-08-02 1999-04-20 Rheinmetall Industrie Ag Propellant charge igniter
EP1039260A2 (en) 1996-08-02 2000-09-27 Rheinmetall W & M GmbH Primer for propulsive charge
EP1039260A3 (en) * 1996-08-02 2000-11-15 Rheinmetall W & M GmbH Primer for propulsive charge
EP1067358A2 (en) 1996-08-02 2001-01-10 Rheinmetall W & M GmbH Igniter for a propulsive charge
EP1067358A3 (en) * 1996-08-02 2001-01-24 Rheinmetall W & M GmbH Igniter for a propulsive charge
US6302008B1 (en) * 1997-09-03 2001-10-16 Rheinmetall W&M Gmbh Process of producing a propellant charge igniter
US6857370B1 (en) * 2002-04-10 2005-02-22 General Dynamics Ordnance And Tactical Systems, Inc. Primer body
EP1577634A1 (en) * 2004-03-17 2005-09-21 Rheinmetall Waffe Munition GmbH Igniter for propulsive charge
DE102009052660A1 (en) 2008-11-13 2010-05-20 Ruag Ammotec Gmbh Pyrotechnic igniter
DE102009052753A1 (en) 2008-11-13 2010-05-27 Ruag Ammotec Gmbh Pyrotechnic igniter
DE102009052578A1 (en) 2008-11-13 2011-05-26 Ruag Ammotec Gmbh Pyrotechnic igniter
DE102009052578B4 (en) 2008-11-13 2021-09-30 Ruag Ammotec Gmbh Pyrotechnic lighter
DE102009052753B4 (en) 2008-11-13 2022-01-20 Ruag Ammotec Gmbh Pyrotechnic igniter
DE102009052660B4 (en) 2008-11-13 2022-10-20 Ruag Ammotec Gmbh Pyrotechnic igniter

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