US3777387A - Firearm and cartridge therefor - Google Patents
Firearm and cartridge therefor Download PDFInfo
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- US3777387A US3777387A US00086361A US3777387DA US3777387A US 3777387 A US3777387 A US 3777387A US 00086361 A US00086361 A US 00086361A US 3777387D A US3777387D A US 3777387DA US 3777387 A US3777387 A US 3777387A
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- propellant
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- firearm
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Links
- 239000002245 particle Substances 0.000 claims abstract description 36
- 239000002904 solvent Substances 0.000 claims abstract description 31
- 239000000523 sample Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000003380 propellant Substances 0.000 claims description 33
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 claims description 14
- 229920001220 nitrocellulos Polymers 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229940079938 nitrocellulose Drugs 0.000 claims description 8
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N Methyl ethyl ketone Natural products CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 7
- 239000000020 Nitrocellulose Substances 0.000 claims description 7
- 230000000977 initiatory effect Effects 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000004451 Ballistite Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical group COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical class FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000003595 mist Substances 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- DMYOHQBLOZMDLP-UHFFFAOYSA-N 1-[2-(2-hydroxy-3-piperidin-1-ylpropoxy)phenyl]-3-phenylpropan-1-one Chemical compound C1CCCCN1CC(O)COC1=CC=CC=C1C(=O)CCC1=CC=CC=C1 DMYOHQBLOZMDLP-UHFFFAOYSA-N 0.000 description 1
- SNIOPGDIGTZGOP-UHFFFAOYSA-N Nitroglycerin Chemical compound [O-][N+](=O)OCC(O[N+]([O-])=O)CO[N+]([O-])=O SNIOPGDIGTZGOP-UHFFFAOYSA-N 0.000 description 1
- 229920001079 Thiokol (polymer) Polymers 0.000 description 1
- MUBKMWFYVHYZAI-UHFFFAOYSA-N [Al].[Cu].[Zn] Chemical compound [Al].[Cu].[Zn] MUBKMWFYVHYZAI-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 101150047356 dec-1 gene Proteins 0.000 description 1
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 1
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- -1 etyl Chemical class 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229960003711 glyceryl trinitrate Drugs 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
- F41A19/58—Electric firing mechanisms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
- F42B5/02—Cartridges, i.e. cases with charge and missile
- F42B5/18—Caseless ammunition; Cartridges having combustible cases
Definitions
- ABSTRACT A combination of a reciprocating bolt, closed breech- 'type of firearm and an ammunition round comprising a caseless charge and projectile which is adapted to be fired by means of an electrical discharge between the end of an ignition probe mounted in the firearm and the projectile attached to the charge.
- the charge is of the caseless type and is porous, being made from comminuted, or particulated combustible materials having the surface of each particle softened with a solvent and gently consolidated in a combustible tube or cover.
- This invention relates to ammunition and firearms. More particularly this invention relates to caseless charges or ammunition useful for firing projectiles or the like from firearms or other ballistic launching devices.
- Caseless ammunition has in the past proved feasible in caliber sizes ranging from 22 caliber through large artillery rounds.
- caseless charges as ammunition in small arms has not been entirely successful, particularly in rapid fire applications.
- Reasons for this lack of success stem from many factors, the chief one being improper, incomplete or otherwise faulty burning of the propellant charge material and resulting lack of sufficient gas generation to adequately propel the projectile.
- Prior art caseless ammunition has been prepared by molding granules, powder or the like, of combustible oxygen bearing substance mixed with a binder of nitrocellulose and dissolved in a solution of ethanol or ethyl ether.
- the mixture is formulated to a semi-solid constituency and thereafter subjected to a pressure of 3,000-9,000 psi for short periods of about seconds and dried at about 50 C.
- a non-porous substance results having relatively poor burning characteristics because of unsatisfactory flame propogation.
- Other workers in the art sought to overcome this problem by preparing the charge by foaming the mixture to induce porosity or by mechanically manipulating the charge by machining cavities and channels therein to create larger burning surfaces.
- Ignition means encompassed all known means including; hot electrical resistance wire, exploding bridge wire, hot air blast, auxiliary charges and spark gap electrical discharge. While success of varying degree has been achieved, a completely satisfactory ammunition round performing at least as well as metal cartridge type rounds has eluded those concerned.
- FIG. 1 is a longitudinal section of a portion of a firearm illustrating the position of the caseless ammunition round of the invention therein at the time of initiation of combustion;
- FIG. 2 is a magnified view of a portion of the charge of the invention along Section 2--2 of FIG. 1;
- FIG. 3 is a sectional view similar to FIG. 1 of another embodiment of the invention.
- FIG. 4 is a view of the invention taken along Section 44 of FIG. 3;
- FIG. 5 is a view similar to FIGS. 1 and 3 of still another embodiment of the invention.
- Round 11 includes a projectile 12 at tached to a hollow caseless charge 13 or propellant by an adhesive 14 (heavy black line in this Figure).
- Projectile 12 has a rearwardly projecting portion 15 which is provided to increase the adhesive surface and for ignition purposes as will be hereafter more fully explained.
- Round 11 is positioned in the bore 16 of firearm 10 with the forward edges of charge 13 abutting the annular wall 17 of a recess 18 in bore 16.
- a reciprocating bolt 21 Situated aftwardly of charge 13 in breech 20 is a reciprocating bolt 21 of the type found in most firearms.
- bolt 21 is modified to include within its structure an electrical conductor 22 together with its associated insulation 23.
- Conductor 22 is a two piece high tension line, one piece being within bolt 21, the other piece leading from a power source 25. The two pieces are electrically joined at a terminal head 22-a when bolt 21 is in the position shown in FIG. 1.
- Insulation 23 (not shown on the piece of conductor 22 leading from power source 25) is selected to provide full insulation of electrical energy therein from the surrounding metal of bolt 21.
- Conductor 22 terminates in electrical contact with an ignition probe 24 which is transported by the moves with bolt 21 in its reciprocating motion. As shown in FIG. 1, bolt 21 and probe 24 are in their extreme forward positions and in firing (breech 20 closed) mode.
- Conductor 22 is connected to high tension electrical power source 25 by means of a switch 26 activated by a firearm trigger 27, shown in schematic form in the various figures
- Charge 13 is a cylindrically shaped combustible mass composed of any of the usual substances well known in the art of ammunition propellants but of modified form for the purpose of this invention, being a porous combustible body made from gun propellant, preferably a homogeneous, solvent type, which is uniquely treated to induce and control porosity and to insure reproducible burning surface and particle web thickness.
- This treatment involves contacting the particles forming the charge mass with a solvent, preferably acetone, to soften the surface thereof, and thereafter consolidating them under a light load of a few ounces to a few pounds, e.g., 2 ounces to about 25 pounds.
- the sizes, i.e., diameters, thicknesses and the like are selected in accordance with the desired end use and burning rate required.
- spherical particles from to about 100 mills diameter are preferred.
- Other particle shapes also usable in this invention are rods, both hollow and solid, flat plates and mixtures of all of these. Since burning time is related to the so-called web thickness or web, which in spherical particles is the diameter thereof, contact time of the solvent and subsequent consolidation load determines web thickness in the completed charge.
- web thickness is one half the distance from the outer surface to the inner surface.
- solid rod particles it is one half the diameter, and in flat plate particles it is one half the distance from one side to the other.
- FIG. 2 illustrates in a magnified view, a portion of charge 13, in this instance the particles being selected from ball propellant and therefore spherical.
- the particles or spheres 28 have been softened by, for example, passing them through a solvent for a short period of a few seconds depending on the temperature thereof and on the type of solvent.
- charge 13 is contained (and consolidated) in protective cylinder 32 cut from thin wall tubing of proxylin (low nitorgen content cellulose nitrate with plasticizer) which is itself consummable in the burning of charge 13.
- Charge 13 when consolidated after softening in tube 32 can be in a hollow form having a central perforation 33 of substantially the same diameter as rearwardly projecting projectile portion and can be attached thereto by adhesive 14.
- An end cover 34 also of pyroxylin can be adhesively attached to the rearward end of charge 13 to seal it against moisture and damage due to handling.
- charge 13 can be made separately in a mold or the like, and protective tube 32 and end cover 34 formed on its outer surface by spraying or dipping to obtain a skin like covering thereon.
- protective tube 32 and end cover 34 formed on its outer surface by spraying or dipping to obtain a skin like covering thereon.
- Other means for containing and protecting charge 13 will no doubt occur to skilled artisans.
- methyl ethyl ketone e.g., methyl ethyl ketone and many of the halogenated hydrocarbons such as methylene chloride, fluorotrichloromethane,'difluorodichloromethane and the like.
- acetone a single pass through the vapor, recovering the particles through a metering valve at the bottom will result in a contact time of at most a few seconds.
- Temperature conditions during the softening period range from about 50 C. to about although, depending on the solvent used, may range from lower to higher temperatures. Warm passing through the softened propellant is used to dry the mass and remove excess solvent to prevent over softening.
- the solvent can be passed through the loose propellant in tube 32 either under pressure or under a vacuum for periods from a few seconds to several minutes depending on the desired degree of surface softening (and therefore porosity of the charge) desired.
- the softened powder is then subjected to warm air for drying and to prevent over softening, and consolidated with any suitable apparatus well known to the art such as a piston and the like under a light compressing load ranging from several ounces to about 25 pounds to obtain the result indicated in FIG. 2 and above described.
- Softening of the particles can also be achieved by spraying the solvent on the moving material or by flowing the solvent over particles which remain stationary.
- While this invention has been described with reference to cellulose nitrate based propellant, other propellant materials are also suitable for application herein.
- the material known as Ballistite" or cellulose nitrate mixed with nitroglycerine also can be used.
- Guanadine nitrate propellants and even black powder are also acceptable candidates in achieving a reproducible charge 13 with the desired predictable porosity.
- FIGS. 3 and '4 illustrate an additional embodiment wherein the electrical ignition circuit is modified in that conductor 22 connects to and' terminates in a round headed terminal 22-a, passing through the lower part of an insulator collar 35 in breech '20.
- Terminal 22-a electrically contacts an outer conductive ring cover 36 which is insulated from the surrounding firearm 10 members by collar 35.
- Conductive ring 36 includes a radially extending central portion 36-a which generally extends from cover 36 to the central area of charge cover 34 over the end of perforation or core 33.
- Probe 24 (in FIG. 3 and also FIG. 5) is electrically isolated from power source 25 when in the position shown in FIG. 3, and from bolt 21 by insulator bushing 24-a.
- FIG. 5 illustrates still another embodiment of this invention wherein charge 13 and cover 34 includes an outer sheath 37 of conductive material.
- Material selected for sheath 37 (and ring 36) include any conductive material, preferably metal foil or the like which is thin enough to be easily pierced by probe 24 and, as will be later indicated, conductive of electric current and combustible.
- conductive material preferably metal foil or the like which is thin enough to be easily pierced by probe 24 and, as will be later indicated, conductive of electric current and combustible.
- Candidate materials are magnesium, aluminum, copper, zinc, iron and titanium and the like.
- Ring 36 and sheath37 can also be integral with cover 34 by forming cover 34 with carbon or metal particles within the pyroxylin whereby current will be conducted from power source 25.
- charge 13 is prepared by softening particles of commercial propellant with a solvent in vapor form by passing the vapor through the loose powder 28 contained in cylinder 18, dropping the propellant particles into the solvent, or any of the other methods above described.
- a mandrel (not shown) can be used to form core 33, whichflcan be hollow and integral with cylinder 18 and of combustible pyroxylin, or removable. After a time sufficient to soften the surfaces of particles 28, the solvent vapor is removed and the particles dried and consolidated under light pressure until charge 13 is of the desired porosity and 'length.
- End cover 34 is preferably preattached to cylinder 18 and the final length of charge 13 is determined by trimming the opposite end.
- a projectile 12 is positioned on charge 13 with projecting portion 15 in core 33 and adhesively attached thereto.
- Round 11 thus prepared is inserted in bore 16 with bolt 21 retracted as shown in FIGS. 3 and 5.
- Bolt 21 is then moved forwardly causing probe 24 to pierce end cover 24 in FIG. 1, coming to rest at position shown in FIG. 1 to provide an electrical discharge gap A between the ends of probe 24 and projectile portion 15.
- Firearm is now armed and ready for firing.
- To ignite charge 13 and fire projectile 12 trigger 27 is pulled closing switch 26.
- Current from power source 25 flows through .lead 22 to ignition probe 24 and discharges across gap A with high energy to ignite charge and fire projectile 12 by the pressurized gas generated thereby.
- FIGS. 3 and 5 bolt 21 is shown in its retracted position, probe 24 being physically and electrically separated from power source 25 and electrically from bolt 21 by bushing 24-a.
- probe 24 pireces end cover 34 and conductive central portion 360a of ring 36, coming to rest in the position shown by the dotted lines in FIGS. 3 and 5, so as to again provide discharge gap A.
- probe 24 becomes'electrically connected to power source 25 and activation of trigger 27 supplies energy thereto, and an electrical discharge across gap A occurs igniting charge l3.
- probe 24 in piercing shield 37 becomes electrically connected to energy source 25 and activation of trigger 27 causes a discharge across gap A to ignite charge 13.
- a porous charge is provided in a, combustible protective cylinder.
- a protective cylinder being similarly made from combustible, low nitrogen content cellulose nitrate, wherein the nitrogen content is in the 7 to 10 percent range and well known to the art also burns completely and contains the porous charge.
- the means for ignition of the propellant is a high tension electrical discharge system which, in the preferred embodiment, is a part of the reciprocating bolt common to most firearms. Arming of the projectile occurs when the bolt is-inits forward position, and though not shown, the circuitry can easily be provided with safety switching means to prevent premature firing, for example, conductor lead 22 can be provided with a switch mounted at the power source or on the firearm itself.
- a propellant charge having a central core and being adhesively attached to said projectile, said charge comprising a combustible mass formed from propellant particles having their outer surfaces softened by contact with a solvent for a period of time of up to sixty seconds and thereafter being consolidated by a force from two ounces to about 25 pounds whereby said mass is sufficiently compacted to cause said particles to become mutually impregnated and form a unitary mass;
- electrical discharge means for initiating combustion of said charge.
- the means for initiating combustion of said charge comprises an ignition probe fixed to said bolt in said breech and positioned with respect to said charge such that the forwardly directed portion of said bolt reciprocating motion causes said probe to penetrate said charge a distance terminating at a point proximate the rear of said projectile, a high voltage power source connected to said probe for generating an electrical discharge between said probe and said projectile to ignite said charge, and means on said firearm connected to said power source and said probe for initiating said electrical discharge.
- said propellant material for said charge is selected from the group consisting of cellulose nitrate, ballistite, guanadine nitrate and black powder.
- the propellant material is a mixture of spherical, rod-like and flat plate particles.
- said solvent is selected from'the group consisting of acetone, alcohol, ether, methyl ethyl ketone and mixtures thereof, methylene chloride and halogenated fluorocarbon solvents.
Abstract
A combination of a reciprocating bolt, closed breech-type of firearm and an ammunition round comprising a caseless charge and projectile which is adapted to be fired by means of an electrical discharge between the end of an ignition probe mounted in the firearm and the projectile attached to the charge. The charge is of the caseless type and is porous, being made from comminuted, or particulated combustible materials having the surface of each particle softened with a solvent and gently consolidated in a combustible tube or cover.
Description
United States Patent [1 1 Ritchey FIREARM AND CARTRIDGE THEREFOR Harold W. Ritchey, Langhorne, Pa.
[73] Assignee: Thiokol Chemical Corporation,
Bristol, Pa.
221 Filed: Nov. 2, 1970 21 App]. No.: 86,361
Related US. Application Data [62] Division of Ser. No. 737,128, June 14,1968, Pat. No.
[75] Inventor:
[52] US. Cl. 42/84 [51] Int. Cl. F41c 19/12 [58] Field of Search 42/84; 102/38 [56] References Cited UNITED STATES PATENTS 3,505,927 4/1970 Driscoll 42/84 3,255,547 6/1966 Gregory.... 42/84 3,311,057 3/1967 Quinlan 102/38 Dec. 11, 1973 Hayner 102/38 Cook 102/104 Primary Examiner-Benjamin A. Borchelt Assistant E.raminerC. T. Jordan Attorney-Thomas W. Brennan [57] ABSTRACT A combination of a reciprocating bolt, closed breech- 'type of firearm and an ammunition round comprising a caseless charge and projectile which is adapted to be fired by means of an electrical discharge between the end of an ignition probe mounted in the firearm and the projectile attached to the charge. The charge is of the caseless type and is porous, being made from comminuted, or particulated combustible materials having the surface of each particle softened with a solvent and gently consolidated in a combustible tube or cover.
16 Claims, 5 Drawing Figures TMENIEU DEC 1 1 I975 SHEET 2 BF 5 I NVEN TOR. Harold W Rife/7e BY 77S.
Pmmeumn 1m 3.7773387 KAI f 36 g 23 d FIG.4
INVENTOR. Haro/dW. R/fchey 1 FIREARM AND CARTRIDGE THEREFOR This application is a division of Application Ser. No. 737,128, filed June 14, 1968 by Harold W. Ritchey now US. Pat. No. 3,563,177.
This invention relates to ammunition and firearms. More particularly this invention relates to caseless charges or ammunition useful for firing projectiles or the like from firearms or other ballistic launching devices.
Caseless ammunition has in the past proved feasible in caliber sizes ranging from 22 caliber through large artillery rounds. However, the use of caseless charges as ammunition in small arms has not been entirely successful, particularly in rapid fire applications. Reasons for this lack of success stem from many factors, the chief one being improper, incomplete or otherwise faulty burning of the propellant charge material and resulting lack of sufficient gas generation to adequately propel the projectile.
Prior art caseless ammunition has been prepared by molding granules, powder or the like, of combustible oxygen bearing substance mixed with a binder of nitrocellulose and dissolved in a solution of ethanol or ethyl ether. The mixture is formulated to a semi-solid constituency and thereafter subjected to a pressure of 3,000-9,000 psi for short periods of about seconds and dried at about 50 C. A non-porous substance results having relatively poor burning characteristics because of unsatisfactory flame propogation. Other workers in the art sought to overcome this problem by preparing the charge by foaming the mixture to induce porosity or by mechanically manipulating the charge by machining cavities and channels therein to create larger burning surfaces. These solutions while improving the burning quality of small arms ammunition, still did not provide a full satisfactory round because, though porosity helped, the degree thereof and its control to form a reproducible propellant surface and web thickness of the particles were inadequate.
Another problem with prior art caseless ammunition wasignition, which either was too time consuming for small arms ammunition or relatively ineffective in accomplishing combustion. Ignition means encompassed all known means including; hot electrical resistance wire, exploding bridge wire, hot air blast, auxiliary charges and spark gap electrical discharge. While success of varying degree has been achieved, a completely satisfactory ammunition round performing at least as well as metal cartridge type rounds has eluded those concerned.
Accordingly it is an important object of this invention to provide an improved round of caseless ammunition which performs at least as well as ordinary ammunition and is capable of being reproduced in large quantities with no appreciable performance deviations from round to round.
Itis still another object of this invention to provide animproved round of caseless ammunition having a porous propellant wherein the degree of porosity thereof is controlled reproducibly from round to round to bring about improved burning characteristics.
ltis still another object of this invention to provide a round of caseless ammunition of the character above referred to wherein an electrical ignition system is used to significantly enhance the overall performance of the round.
It is a still further object of this invention to provide an improved closed breech type firearm which accommodates the improved propellant charge of this invention and also serves as an important part of the ignition system therefor.
Other objects and advantages of this invention will be readily apparent upon perusal and consideration of the following description and the drawings annexed wherein;
FIG. 1 is a longitudinal section of a portion of a firearm illustrating the position of the caseless ammunition round of the invention therein at the time of initiation of combustion;
FIG. 2 is a magnified view of a portion of the charge of the invention along Section 2--2 of FIG. 1;
FIG. 3 is a sectional view similar to FIG. 1 of another embodiment of the invention;
FIG. 4 is a view of the invention taken along Section 44 of FIG. 3; and
FIG. 5 is a view similar to FIGS. 1 and 3 of still another embodiment of the invention.
Referring now to the drawings, and in particular to FIG. 1 thereof, there is shown the interior breech portion of a firearm 10 with a round 11 in a preferred form of the invention, Round 11 includes a projectile 12 at tached to a hollow caseless charge 13 or propellant by an adhesive 14 (heavy black line in this Figure). Projectile 12 has a rearwardly projecting portion 15 which is provided to increase the adhesive surface and for ignition purposes as will be hereafter more fully explained. Round 11 is positioned in the bore 16 of firearm 10 with the forward edges of charge 13 abutting the annular wall 17 of a recess 18 in bore 16.
Situated aftwardly of charge 13 in breech 20 is a reciprocating bolt 21 of the type found in most firearms. However in this instance bolt 21 is modified to include within its structure an electrical conductor 22 together with its associated insulation 23. Conductor 22 is a two piece high tension line, one piece being within bolt 21, the other piece leading from a power source 25. The two pieces are electrically joined at a terminal head 22-a when bolt 21 is in the position shown in FIG. 1. Insulation 23 (not shown on the piece of conductor 22 leading from power source 25) is selected to provide full insulation of electrical energy therein from the surrounding metal of bolt 21. Conductor 22 terminates in electrical contact with an ignition probe 24 which is transported by the moves with bolt 21 in its reciprocating motion. As shown in FIG. 1, bolt 21 and probe 24 are in their extreme forward positions and in firing (breech 20 closed) mode. Conductor 22 is connected to high tension electrical power source 25 by means of a switch 26 activated by a firearm trigger 27, shown in schematic form in the various figures.
FIG. 2 illustrates in a magnified view, a portion of charge 13, in this instance the particles being selected from ball propellant and therefore spherical. However, any particle shape above-mentioned can be used. Referring to FIG. 2 the particles or spheres 28 have been softened by, for example, passing them through a solvent for a short period of a few seconds depending on the temperature thereof and on the type of solvent. The particles are then collected in a protective-cylinder 18 and consolidated while still softened, consolidation pressure on the order above referred to being sufficient to result in the formation of mutual impregnations or penetrations 29, in the consolidating step, excess material 30 flows into the interconnecting channels of interstices 31 between particles 28, and by careful control thereof a mass having a predictable and reproducible degree of porosity, and therefore consistant burning characteristics, results. It should also be evident that similar results can be obtained regardless, within the above stated limitations, of the particle shape selected.
In practice charge 13 is contained (and consolidated) in protective cylinder 32 cut from thin wall tubing of proxylin (low nitorgen content cellulose nitrate with plasticizer) which is itself consummable in the burning of charge 13. Charge 13 when consolidated after softening in tube 32 can be in a hollow form having a central perforation 33 of substantially the same diameter as rearwardly projecting projectile portion and can be attached thereto by adhesive 14. An end cover 34 also of pyroxylin can be adhesively attached to the rearward end of charge 13 to seal it against moisture and damage due to handling.
Alternatively, charge 13 can be made separately in a mold or the like, and protective tube 32 and end cover 34 formed on its outer surface by spraying or dipping to obtain a skin like covering thereon. Other means for containing and protecting charge 13 will no doubt occur to skilled artisans.
While the preparation of charge 13 has been disclosed as a porous mold of propellant or powder treated by contact therewith of acetone, it should be understood that other solvents can be used for applicants purpose. For example, various alcohols, e.g., etyl, methyl, propyl and butyl alcohol, ether, mixtures thereof and of acetone therewith will also accomplish this end. Other solvents include many of the ketones,
e.g., methyl ethyl ketone and many of the halogenated hydrocarbons such as methylene chloride, fluorotrichloromethane,'difluorodichloromethane and the like. It is preferred to pass the propellant particles through the solvent which is in the vapor form, or in a mist, for sufficient time to obtain the desired surface softening, this being determined by choice of solvent. In the case of acetone, a single pass through the vapor, recovering the particles through a metering valve at the bottom will result in a contact time of at most a few seconds. Temperature conditions during the softening period range from about 50 C. to about although, depending on the solvent used, may range from lower to higher temperatures. Warm passing through the softened propellant is used to dry the mass and remove excess solvent to prevent over softening.
In other instances the solvent can be passed through the loose propellant in tube 32 either under pressure or under a vacuum for periods from a few seconds to several minutes depending on the desired degree of surface softening (and therefore porosity of the charge) desired. The softened powder is then subjected to warm air for drying and to prevent over softening, and consolidated with any suitable apparatus well known to the art such as a piston and the like under a light compressing load ranging from several ounces to about 25 pounds to obtain the result indicated in FIG. 2 and above described. Softening of the particles can also be achieved by spraying the solvent on the moving material or by flowing the solvent over particles which remain stationary.
While this invention has been described with reference to cellulose nitrate based propellant, other propellant materials are also suitable for application herein. For example, the material known as Ballistite" or cellulose nitrate mixed with nitroglycerine also can be used. Guanadine nitrate propellants and even black powder are also acceptable candidates in achieving a reproducible charge 13 with the desired predictable porosity.
FIGS. 3 and '4 illustrate an additional embodiment wherein the electrical ignition circuit is modified in that conductor 22 connects to and' terminates in a round headed terminal 22-a, passing through the lower part of an insulator collar 35 in breech '20. Terminal 22-a electrically contacts an outer conductive ring cover 36 which is insulated from the surrounding firearm 10 members by collar 35. Conductive ring 36 includes a radially extending central portion 36-a which generally extends from cover 36 to the central area of charge cover 34 over the end of perforation or core 33. Probe 24 (in FIG. 3 and also FIG. 5) is electrically isolated from power source 25 when in the position shown in FIG. 3, and from bolt 21 by insulator bushing 24-a. FIG. 4 shows the relative position of cover 36 and center portion-36-a when viewed from breech 20. It should be noted that regardless of the orientation of round 11 in bore 16, electrical contact will be maintained between ring 36 and conductor 22, and central portion 36-a will always extend over perforation 33.
FIG. 5 illustrates still another embodiment of this invention wherein charge 13 and cover 34 includes an outer sheath 37 of conductive material. Material selected for sheath 37 (and ring 36) include any conductive material, preferably metal foil or the like which is thin enough to be easily pierced by probe 24 and, as will be later indicated, conductive of electric current and combustible. Candidate materials are magnesium, aluminum, copper, zinc, iron and titanium and the like. Ring 36 and sheath37 can also be integral with cover 34 by forming cover 34 with carbon or metal particles within the pyroxylin whereby current will be conducted from power source 25.
In operation of the invention charge 13 is prepared by softening particles of commercial propellant with a solvent in vapor form by passing the vapor through the loose powder 28 contained in cylinder 18, dropping the propellant particles into the solvent, or any of the other methods above described. A mandrel (not shown) can be used to form core 33, whichflcan be hollow and integral with cylinder 18 and of combustible pyroxylin, or removable. After a time sufficient to soften the surfaces of particles 28, the solvent vapor is removed and the particles dried and consolidated under light pressure until charge 13 is of the desired porosity and 'length. End cover 34 is preferably preattached to cylinder 18 and the final length of charge 13 is determined by trimming the opposite end. A projectile 12 is positioned on charge 13 with projecting portion 15 in core 33 and adhesively attached thereto. Round 11 thus prepared is inserted in bore 16 with bolt 21 retracted as shown in FIGS. 3 and 5. Bolt 21 is then moved forwardly causing probe 24 to pierce end cover 24 in FIG. 1, coming to rest at position shown in FIG. 1 to provide an electrical discharge gap A between the ends of probe 24 and projectile portion 15. Firearm is now armed and ready for firing. To ignite charge 13 and fire projectile 12 trigger 27 is pulled closing switch 26. Current from power source 25 flows through .lead 22 to ignition probe 24 and discharges across gap A with high energy to ignite charge and fire projectile 12 by the pressurized gas generated thereby.
In FIGS. 3 and 5, bolt 21 is shown in its retracted position, probe 24 being physically and electrically separated from power source 25 and electrically from bolt 21 by bushing 24-a. As bolt 21 is moved forwardly probe 24 pireces end cover 34 and conductive central portion 360a of ring 36, coming to rest in the position shown by the dotted lines in FIGS. 3 and 5, so as to again provide discharge gap A. In piercing central portion 36-a, probe 24 becomes'electrically connected to power source 25 and activation of trigger 27 supplies energy thereto, and an electrical discharge across gap A occurs igniting charge l3.Similarly in FIG. 5 probe 24 in piercing shield 37 becomes electrically connected to energy source 25 and activation of trigger 27 causes a discharge across gap A to ignite charge 13.
Thus what has been described and illustrated is a new form of caseless ammunition wherein a porous charge is provided in a, combustible protective cylinder. By treating a commercially obtainable propellant by the methods above described, controlled and. predictable porosity is obtained, and upon ignition, complete combustion occurs, smoothly and with little or no residue. A protective cylinder being similarly made from combustible, low nitrogen content cellulose nitrate, wherein the nitrogen content is in the 7 to 10 percent range and well known to the art also burns completely and contains the porous charge. The means for ignition of the propellant is a high tension electrical discharge system which, in the preferred embodiment, is a part of the reciprocating bolt common to most firearms. Arming of the projectile occurs when the bolt is-inits forward position, and though not shown, the circuitry can easily be provided with safety switching means to prevent premature firing, for example, conductor lead 22 can be provided with a switch mounted at the power source or on the firearm itself.
While only a preferred and several additional embodiments have been presented, it should be understood that other variations and modifications will become apparent to skilled artisans after perusal hereof. Therefore no limitations should be placed upon the scope of this invention except as indicated by the appended claims.
I claim:
1. A firearm of the reciprocating bolt, closed breech type in combination with a caseless ammunition round, said round adapted to be electrically ignited and fired from said firearm and comprising:
a projectile;
a propellant charge having a central core and being adhesively attached to said projectile, said charge comprising a combustible mass formed from propellant particles having their outer surfaces softened by contact with a solvent for a period of time of up to sixty seconds and thereafter being consolidated by a force from two ounces to about 25 pounds whereby said mass is sufficiently compacted to cause said particles to become mutually impregnated and form a unitary mass;
a combustible pyroxylin protective tube containing said mass;
a combustible, pierceable end cover attached to said tube; and,
electrical discharge means for initiating combustion of said charge.
2. The invention of claim 1, wherein said mass in said charge is porous.
3. The invention of claim 1, wherein the means for initiating combustion of said charge comprises an ignition probe fixed to said bolt in said breech and positioned with respect to said charge such that the forwardly directed portion of said bolt reciprocating motion causes said probe to penetrate said charge a distance terminating at a point proximate the rear of said projectile, a high voltage power source connected to said probe for generating an electrical discharge between said probe and said projectile to ignite said charge, and means on said firearm connected to said power source and said probe for initiating said electrical discharge.
4. The invention of claim 1 wherein said propellant material for said charge is selected from the group consisting of cellulose nitrate, ballistite, guanadine nitrate and black powder.
5. The invention of claim 1 wherein the propellant particles are spherical.
6. The invention of claim 1, wherein the propellant particles are rod like.
7. The invention of claim 1 wherein the propellant particles are flat plates.
8. The invention of claim 1, wherein the propellant material is a mixture of spherical, rod-like and flat plate particles.
9. The invention of claim 1, wherein said solvent is selected from'the group consisting of acetone, alcohol, ether, methyl ethyl ketone and mixtures thereof, methylene chloride and halogenated fluorocarbon solvents.
10. The invention of claim 1, wherein the solvent is a vapor.
ll. The invention of claim 1, wherein the solvent is 15. The invention of claim 14, wherein said conducthe form of mlsltive portion of said cover is a metal selected from the 12. The invention of claim 1, wherein the solvent is l d group consisting of aluminu, magnesium, copper, zinc, a iqui 13. The invention of claim 1, wherein the material of 5 and l l' Said end cover is pyroxylin 16. The invention of claim 14, wherein said conduc- 14. The invention of claim 1, wherein a portion of live Portion of Said cover is Carbon said end cover is electrically conductive.
Claims (16)
1. A firearm of the reciprocating bolt, closed breech type in combination with a caseless ammunition round, said round adapted to be electrically ignited and fired from said firearm and comprising: a projectile; a propellant charge having a central core and being adhesively attached to said projectile, said charge comprising a combustible mass formed from propellant particles having their outer surfaces softened by contact with a solvent for a period of time of up to sixty seconds and thereafter being consolidated by a force from two ounces to about 25 pounds whereby said mass is sufficiently compacted to cause said particles to become mutually impregnated and form a unitary mass; a combustible pyroxylin protective tube containing said mass; a combustible, pierceablE end cover attached to said tube; and, electrical discharge means for initiating combustion of said charge.
2. The invention of claim 1, wherein said mass in said charge is porous.
3. The invention of claim 1, wherein the means for initiating combustion of said charge comprises an ignition probe fixed to said bolt in said breech and positioned with respect to said charge such that the forwardly directed portion of said bolt reciprocating motion causes said probe to penetrate said charge a distance terminating at a point proximate the rear of said projectile, a high voltage power source connected to said probe for generating an electrical discharge between said probe and said projectile to ignite said charge, and means on said firearm connected to said power source and said probe for initiating said electrical discharge.
4. The invention of claim 1 wherein said propellant material for said charge is selected from the group consisting of cellulose nitrate, ballistite, guanadine nitrate and black powder.
5. The invention of claim 1 wherein the propellant particles are spherical.
6. The invention of claim 1, wherein the propellant particles are rod like.
7. The invention of claim 1 wherein the propellant particles are flat plates.
8. The invention of claim 1, wherein the propellant material is a mixture of spherical, rod-like and flat plate particles.
9. The invention of claim 1, wherein said solvent is selected from the group consisting of acetone, alcohol, ether, methyl ethyl ketone and mixtures thereof, methylene chloride and halogenated fluorocarbon solvents.
10. The invention of claim 1, wherein the solvent is a vapor.
11. The invention of claim 1, wherein the solvent is in the form of a mist.
12. The invention of claim 1, wherein the solvent is a liquid.
13. The invention of claim 1, wherein the material of said end cover is pyroxylin.
14. The invention of claim 1, wherein a portion of said end cover is electrically conductive.
15. The invention of claim 14, wherein said conductive portion of said cover is a metal selected from the group consisting of aluminu, magnesium, copper, zinc, iron and titanium.
16. The invention of claim 14, wherein said conductive portion of said cover is carbon.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US73712868A | 1968-06-14 | 1968-06-14 | |
US8636170A | 1970-11-02 | 1970-11-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3777387A true US3777387A (en) | 1973-12-11 |
Family
ID=26774664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00086361A Expired - Lifetime US3777387A (en) | 1968-06-14 | 1970-11-02 | Firearm and cartridge therefor |
Country Status (1)
Country | Link |
---|---|
US (1) | US3777387A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2508570A1 (en) * | 1981-06-26 | 1982-12-31 | Toska Co Ltd | ONE PIECE SYNTHETIC RESIN STAPLE, FOR FIXING LABELS TO GOODS OR FOR ATTACHING ARTICLES BETWEEN THEM |
US5608982A (en) * | 1994-12-12 | 1997-03-11 | Giat Industries | Method and apparatus for an electric arc firing system for caseless ammunition |
US6186040B1 (en) * | 1997-12-23 | 2001-02-13 | Tzn Forschungs- Und Entwicklungszentrum | Plasma burning device for electrothermal and electrothermal/chemical gun systems |
US6374525B1 (en) * | 1999-04-14 | 2002-04-23 | Nils Thomas | Firearm having an electrically switched ignition system |
US6431070B1 (en) * | 2001-07-12 | 2002-08-13 | Joanell Laboratories, Inc. | Electrical connector for use with pyrotechnic ignition apparatus |
US6543330B2 (en) * | 2000-10-20 | 2003-04-08 | Rheinmetall W & M Gmbh | Gun for firing electrically-ignitable cartridges containing electronic components |
US20050188872A1 (en) * | 2004-02-25 | 2005-09-01 | Oertwig Terrance D. | Electronic ignition system for personal black powder firearms |
US20070137470A1 (en) * | 2004-02-25 | 2007-06-21 | Oertwig Terrance D | Sequential discharge electronic ignition system for blackpowder firearms |
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US702208A (en) * | 1902-02-25 | 1902-06-10 | William Everton Hayner | Cartridge. |
US3092525A (en) * | 1960-09-30 | 1963-06-04 | Olin Mathieson | Method of producing unitary nitrocellulose grains capable of fragmentation under primer blast to original granules |
US3255547A (en) * | 1965-01-28 | 1966-06-14 | Grego Inc | Firearm bolt mechanism for firing electric filament primed cartridges |
US3311057A (en) * | 1965-08-03 | 1967-03-28 | Joseph B Quinlan | Combustible caseless ammunition |
US3505927A (en) * | 1967-11-06 | 1970-04-14 | Allied Res Ass Inc | Automatic firearm having electrical ignition of cartridges in a rotating and reciprocating cylinder |
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1970
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US702208A (en) * | 1902-02-25 | 1902-06-10 | William Everton Hayner | Cartridge. |
US3092525A (en) * | 1960-09-30 | 1963-06-04 | Olin Mathieson | Method of producing unitary nitrocellulose grains capable of fragmentation under primer blast to original granules |
US3255547A (en) * | 1965-01-28 | 1966-06-14 | Grego Inc | Firearm bolt mechanism for firing electric filament primed cartridges |
US3311057A (en) * | 1965-08-03 | 1967-03-28 | Joseph B Quinlan | Combustible caseless ammunition |
US3505927A (en) * | 1967-11-06 | 1970-04-14 | Allied Res Ass Inc | Automatic firearm having electrical ignition of cartridges in a rotating and reciprocating cylinder |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2508570A1 (en) * | 1981-06-26 | 1982-12-31 | Toska Co Ltd | ONE PIECE SYNTHETIC RESIN STAPLE, FOR FIXING LABELS TO GOODS OR FOR ATTACHING ARTICLES BETWEEN THEM |
US5608982A (en) * | 1994-12-12 | 1997-03-11 | Giat Industries | Method and apparatus for an electric arc firing system for caseless ammunition |
US6186040B1 (en) * | 1997-12-23 | 2001-02-13 | Tzn Forschungs- Und Entwicklungszentrum | Plasma burning device for electrothermal and electrothermal/chemical gun systems |
US6374525B1 (en) * | 1999-04-14 | 2002-04-23 | Nils Thomas | Firearm having an electrically switched ignition system |
US6543330B2 (en) * | 2000-10-20 | 2003-04-08 | Rheinmetall W & M Gmbh | Gun for firing electrically-ignitable cartridges containing electronic components |
US6431070B1 (en) * | 2001-07-12 | 2002-08-13 | Joanell Laboratories, Inc. | Electrical connector for use with pyrotechnic ignition apparatus |
US20050188872A1 (en) * | 2004-02-25 | 2005-09-01 | Oertwig Terrance D. | Electronic ignition system for personal black powder firearms |
US7197843B2 (en) * | 2004-02-25 | 2007-04-03 | Opg Gun Ventures, Llc | Electronic ignition system for a firearm |
US20070107591A1 (en) * | 2004-02-25 | 2007-05-17 | Oertwig Terrance D | Electronic Ignition system for a Firearm |
US20070137470A1 (en) * | 2004-02-25 | 2007-06-21 | Oertwig Terrance D | Sequential discharge electronic ignition system for blackpowder firearms |
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