US3566792A - Ammunition - Google Patents

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Publication number
US3566792A
US3566792A US3566792DA US3566792A US 3566792 A US3566792 A US 3566792A US 3566792D A US3566792D A US 3566792DA US 3566792 A US3566792 A US 3566792A
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United States
Prior art keywords
fingers
skeleton
hub
ammunition
cartridge case
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Expired - Lifetime
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Andrew J Grandy
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Andrew J Grandy
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Priority to US74014168A priority Critical
Priority to US8085070A priority
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/26Cartridge cases
    • F42B5/30Cartridge cases of plastics, i.e. the cartridge-case tube is of plastics
    • F42B5/307Cartridge cases of plastics, i.e. the cartridge-case tube is of plastics formed by assembling several elements

Abstract

A built-up cartridge case in which a blanked and formed steel metal skeleton is provided having longitudinal finger elements that are laminated with reinforced plastic material.

Description

United States Patent Inventor Andrew J. Grandy 2707 Grant Ave, North Hills, Pa. 19038 Appl. No. 740,141

Filed June 26, 1968 Patented Mar. 2, 1971 AMMUNITION 3 Claims, 5 Drawing Figs.

U.S. Cl 102/38, 102/43 Int. Cl F42b 5/26 Field of Search 102/38, 39,

[ 56] References Cited UNITED STATES PATENTS 702,208 6/1902 Hayner 102/49. 1X

991,945 5/ l9l l Burnett 102/43 1,024,373 4/1912 Sowards 102/43 2,837,456 6/1958 Parilla 102/43X 3,095,813 7/1963 Lipinski I 102/43 3,209,689 10/1965 McLennan 102/38 Primary Examiner-Robert F. Stahl Attorneys l-larry M. Saragovitz, Edward J. Kelly, Herbert Berl and S. Dubroff ABSTRACT: A built-up cartridge case in which a blanked and formed steel metal skeleton is provided having longitudinal finger elements that are laminated with reinforced plastic material.

Patented March 2, 1971 2 Sheets-Sheet l INVENTOR. ANDREW J. GRANDY BY-' I W N Z V- XQM ATTORNEYS- Patentd March 2,1971

2 Sheets-Sheet 2 INVENTOR. ANDREW J. GRANDY 5 mJ Mia! v M24 ATTORNEYS.

AMMUNITION The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to me of any royalty thereon.

This invention relates to ammunition and, more particularly, to cartridge cases and the method of making same for small arms ammunition.

Envisioning the possible criticality of future supply availability of certain metals such as copper or alloys thereof, there is recognized an urgent requirement to find a substitute construction for small arms brass cartridge cases.

One of the objects of the invention is to provide a cartridge case in which there is eliminated the need for copper or alloys thereof in which the supply may be critical.

Another object of the invention is to produce such a cartridge case with a minimum number of operations.

These and other objects, features and advantages will become more apparent from the following description and accompanying drawings in which:

FIG. 1 is a top plan view of a blanked or stamped metal skeleton from which the improved cartridge case is built up.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1.

FIG. 3 is an elevational view, partially broken away, of a cartridge case embodying the principles of the invention.

FIG. 4 is an. elevational sectional view of a cartridge case necked down for assembling a round of ammunition.

FIG. 5 is a similar view of an assembled round with a modified cartridge case. n

The steel metal skeleton, shown generally at (FIGS. I, 2) is blanked or stamped into the forms shown with a central annular hub 11 having a central aperture 12 for securely locating a suitable primer upon assembly of the ammunition round. The hub has a rearwardly offset annulus 13 from which a plurality of finger elements 14 extend in a radial direction, prior to their being formed to extend in a direction substantially normal to the hub and in a substantially peripherally spaced relationship to each other as viewed in FIG 3, with the fingers 14 each having their rearward ends offset inwardly as shown at 14 in phantom. Preferably, the skeleton is formed of low carbon steel sheet material. In order to provide the appropriate skeleton contour, tooling requirements include flat blanking and forming punches and dies.

On either or both sides of the skeleton, a high tensile strength roving such as a glass rnonofilament 16 and/or 17 (FIGS. 3, 4, 5) 3,4,5) or other high tensile, high yield steel or metallic wire are wound in spiral fashion 16A and/or 17A or other suitable pattern around the formed group of fingers 14. Preferably, when both inner and outer windings 17A, 16A are used, they are spirally wound in relatively opposite directions such that areas of voids are kept to a minimum for obtaining a case of maximum strength. The wires are coated with a thermosetting resin material 19 which may be accomplished by either precoating the wires, dipping the wires in the thermosetting material, or by dipping the skeleton and its wound I rovings in uncured resin, with the final polymerization taking place during a subsequent molding operation by which the voids or interstices are completely filled, and the blanked and formed skeleton is thus provided with a lamination of reinforced plastic material. The laminating material for the case skeleton may be any thermosetting material such as epoxy, phenal-formaldehyde, melamine or fluoroplastics, so long as it possesses good molding qualities, high impact strength, is resistive to heat and moisture, and has the capacity to withstand the effects of acids, solvents, alkalies and sunlight. in the FIG. 5 embodiment, the inner lamination 19A is formed by use of an expanding mandrel to obtain outward radial molding pressure. Y

The cartridge case, after being neciked down to predetermined dimensions for securement such as by crimping upon a grooved projectile or bullet 21, is provided with a conventional primer 20 prior to propellant loading and bullet sealing operations.

Preferably, the cartridge case IS propellant loaded after priming and heat sealing of the bullet to the inner periphery of the cartridge case as illustrated at.23 (FIG. 5). An appropriate annular seal 24 is provided as by. crimping case contact portions at the case mouth or finger tip. area to sealingly engage the bullet groove or cannulure 25. To facilitate propellant loading, holes 26 are drilled through the case and subsequently suitably sealed. In this manner there is minimized the danger or hazard of accidental initiation during the heat sealing operation. Where cold sealing techniques are employed, propellant loading can be accomplished prior tobullet assembly. The sealing materials used in either manner must be compatible with the therniosetting resins and metal bullet jacket.

Various modifications, alterations or changes may be resorted to without departing from the scope of the invention as defined in the appended claims.

Iclaim:

l. A cartridge case for ammunition comprising a steel metal skeleton having a central hub portion and a plurality of substantially peripherally spaced elongated fingers, said fingers having unconnected free ends and extending substantially normal to said hub portion, said skeleton fingers having a lamina tion of reinforced plastic material wrapped around at least exterior surface portions of said fingers.

2. The structure of claim I wherein said hub portion is provided with a primer, said laminated skeleton is loaded with propellant, and a projectile is sealingly and mechanically secured to said laminated fingers.

3. The structure of claim I wherein said lamination includes a high strength monofilament wound around and connecting adjacent ones of the group of peripherally'spaced fingers, said monofilament having a coating of thermosetting resin molded thereon.

Claims (3)

1. A cartridge case for ammunition comprising a steel metal skeleton having a central hub portion and a plurality of substantially peripherally spaced elongated fingers, said fingers having unconnected free ends and extending substantially normal to said hub portion, said skeleton fingers having a lamination of reinforced plastic material wrapped around at least exterior surface portions of said fingers.
2. The structure of claim 1 wherein said hub portion is provided with a primer, said laminated skeleton is loaded with propellant, and a projectile is sealingly and mechanically secured to said laminated fingers.
3. The structure of claim 1 wherein said lamination includes a high strength monofilament wound around and connecting adjacent ones of the group of peripherally spaced fingers, said monofilament having a coating of thermosetting resin molded thereon.
US3566792D 1968-06-26 1968-06-26 Ammunition Expired - Lifetime US3566792A (en)

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US74014168A true 1968-06-26 1968-06-26
US8085070A true 1970-10-15 1970-10-15

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US3706256D Expired - Lifetime US3706256A (en) 1968-06-26 1970-10-15 Method of making ammunition

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060248773A1 (en) * 2002-10-21 2006-11-09 Kightlinger Paul E Firearm and munitions kit
US20100282112A1 (en) * 2009-05-06 2010-11-11 Vin Battaglia Spiral case ammunition
US20150192394A1 (en) * 2014-01-09 2015-07-09 Randy R. Fritz Hollow Slug and Casing
WO2018134718A1 (en) * 2017-01-19 2018-07-26 Global Consulting Expertise Gmbh Ammunition cartridge, system, and method for facilitating recovery of used cartridge casings

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818834A (en) * 1972-02-04 1974-06-25 K Baumgartener Reusable blank cartridge and reloading assemblies
US5165040A (en) * 1991-12-23 1992-11-17 General Dynamics Corp., Air Defense Systems Division Pre-stressed cartridge case

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US702208A (en) * 1902-02-25 1902-06-10 William Everton Hayner Cartridge.
US991945A (en) * 1910-10-04 1911-05-09 William W Burnett Gun-shell attachment.
US1024373A (en) * 1911-12-26 1912-04-23 Henry Mcbride Shell construction.
US2837456A (en) * 1952-02-29 1958-06-03 Kellogg M W Co Filament wound container
US3095813A (en) * 1961-07-05 1963-07-02 Henry S Lipinski Propellant container, plastic impregnated glass
US3209689A (en) * 1956-11-14 1965-10-05 Mclennan Donald Elmore Reduction of gun barrel wear

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172799A (en) * 1965-03-09 Wire spacing jig and method
US2792324A (en) * 1954-11-24 1957-05-14 Specialties Dev Corp Method of manufacturing hollow articles composed of resin impregnated yarn windings
NL296255A (en) * 1960-01-12
DE1232046B (en) * 1964-02-28 1967-01-05 Dynamit Nobel Ag Cartridge for shooting at short distances

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US702208A (en) * 1902-02-25 1902-06-10 William Everton Hayner Cartridge.
US991945A (en) * 1910-10-04 1911-05-09 William W Burnett Gun-shell attachment.
US1024373A (en) * 1911-12-26 1912-04-23 Henry Mcbride Shell construction.
US2837456A (en) * 1952-02-29 1958-06-03 Kellogg M W Co Filament wound container
US3209689A (en) * 1956-11-14 1965-10-05 Mclennan Donald Elmore Reduction of gun barrel wear
US3095813A (en) * 1961-07-05 1963-07-02 Henry S Lipinski Propellant container, plastic impregnated glass

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060248773A1 (en) * 2002-10-21 2006-11-09 Kightlinger Paul E Firearm and munitions kit
US7316093B2 (en) 2002-10-21 2008-01-08 Kightlinger Paul E Firearm and munitions kit
US20100282112A1 (en) * 2009-05-06 2010-11-11 Vin Battaglia Spiral case ammunition
US8408137B2 (en) * 2009-05-06 2013-04-02 Vin Battaglia Spiral case ammunition
US20150192394A1 (en) * 2014-01-09 2015-07-09 Randy R. Fritz Hollow Slug and Casing
US9395163B2 (en) * 2014-01-09 2016-07-19 Randy R. Fritz Hollow slug and casing
WO2018134718A1 (en) * 2017-01-19 2018-07-26 Global Consulting Expertise Gmbh Ammunition cartridge, system, and method for facilitating recovery of used cartridge casings

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US3706256A (en) 1972-12-19

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