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US3712172A - Link-seal unit for caseless ammunition - Google Patents

Link-seal unit for caseless ammunition Download PDF

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Publication number
US3712172A
US3712172A US00057604A US3712172DA US3712172A US 3712172 A US3712172 A US 3712172A US 00057604 A US00057604 A US 00057604A US 3712172D A US3712172D A US 3712172DA US 3712172 A US3712172 A US 3712172A
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United States
Prior art keywords
ring
round
channel
link
straps
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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
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US00057604A
Inventor
H Wiese
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United States Department of the Army
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United States Department of the Army
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
    • F42B39/08—Cartridge belts
    • F42B39/082—Cartridge belts for caseless ammunition
    • 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
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S102/00—Ammunition and explosives
    • Y10S102/70—Combustilbe cartridge

Definitions

  • ABSTRACT [52] U.S. Cl. ..89/17, 42/15, 89/26,
  • Extending diametri- UNITED STATES PATENTS cally from the O ring is a female strap and a male strap for interconnecting one unit to another to form 3,009,394 11/1961 Kamp et al. ..89/35 A an ammunition belt 3,626,620 12/1971 Rocha 3,429,220 2/1969 Goode ..89/35 R 4 Claims, 4 Drawing Figures PATENTEDJAHZB I975 3,712,172
  • ATTORNEYS LINK-SEAL UNIT FOR CASELESS 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 seals for obturating split chambers in a gun and to interconnecting links for feeding rounds to the gun and pertains more particularly to a unit which performs both functions and is adapted for use with caseless ammunition.
  • caseless ammunition which will result in a much simpler and therefore lighter gun, will reduce considerably the weight of the ammunition required for the gun, and will eliminate the problem pertaining to the disposal of the expended cartridge cases, problems have arisen as to finding other means for performing these functions performed in conventional guns by the metallic cartridge case.
  • problem of feeding caseless rounds to the gun because the rather fragile nature of caseless rounds eliminates the conventional type of links which require that the cartridges be stripped therefrom.
  • the present invention successfully overcomes some of these problems by including in an ammunition belt link an O ring which acts as the round retainer means so that besides providing soft contact between the link and the caseless round to prevent damage thereto it also acts as a seal for obturating the junction formed between the relatively moving breech sections when the round is used in a split-chamber gun and the sections are closed.
  • FIG. 1 is a longitudinally cross-sectioned view of the split chamber portion of a gun and shows the chamber sections in their open positions and a caseless round located therebetween;
  • FIG. 2 is a view similar to FIG. 1 but shows the chamber sections in their closed positions with a round located in the completed chamber;
  • FIG. 3 is a cross-sectional view taken along line 33 of FIG. 1;
  • FIG. 4 is a perspective view of the seal and link combination unit.
  • a firearm breech 12 comprising a chamber 14 to receive for discharge a caseless round 16 of telescopic configuration wherein projectile 18 is initially located within an axial bore I9 through body 20 composed of a molded propellant material.
  • Breech I2 is divided, approximately equally, into a front section 22 with an open rear end 24 and a rear section 26 with an open front end 28.
  • Sections 22 and 26 are axially displaceable relative to each other, by firearm structure not shown, between an open position, wherein ends 24 and 28 are spaced apart sufficiently to permit longitudinal location of round 16 therebetween, by a firearm firing mechanism not shown, and a closed position wherein the ends are in contact and chamber 14 is fully completed to enclose for discharge the round located therein.
  • ends 24 and 28 meet approximately midway the length of round 16 in chamber 14.
  • Unit 30 Installed on each round 16 is a link and seal unit 30 through which, as hereinafter described, the junction of ends 24 and 28 is sealed gas tight and a plurality of the rounds are interconnectable to form a linked belt, as shown in FIG. 3.
  • Unit 30, as shown in FIG. 4 comprises an O ring 34 and a pair of straps, including a female strap 38 and a male strap 40, extending diametrically therefrom.
  • O ring 34 is partially received by an annular channel 42 located around body 20 approximately midway the length thereof so as to coincident with the junction of ends 24 and 28 when sections 22 and 26 are in their closed positions, as shown in FIG. 2.
  • Channel 42 is formed so as to receive less than one-half of the cross-sectional area of O ring 34 so that more than onehalf the cross-sectional area thereof, noted at 36, protrudes from body 20.
  • annular groove 46 Formed around the junctions of each end 24 and 28 with the respective portions of chamber 14 is an annular groove 46 having a cross-section which conforms with one-half that of protruding portion 36 of O ring 34 so that when sections 22 and 26 are in closed positions, as shown in FIG. 2, the protruding portion is snugly received between the grooves.
  • Diametrical recesses 43 in end 24 cooperate with similar recesses 45 in end 26 to provide clearances for female strap 38 and male strap 40 when sections 24 and 26 are in closed positions.
  • the free end of female strap 38 is increased in width to permit formation therein of a slot 44 which is elongated normal to the longitudinal axis of the strap so that the length of the slot is equal to the width of male strap 40.
  • a pair of tabs 48 extend oppositely from the free end of male strap 40 and such tabs when deformed and slot 44 is cooperatively deformed] therewith permit the insertion of the male strap on one unit 30 through the slot in the female strap of another unit thereby to interconnect two units together.
  • Unit 30 is preferably molded in one piece from glass fiber filled thermoplastic material such as acrylonitrile so that O ring 34 has just enough elongation, about 5-8 percent, to allow it to be forced over body 20 into channel 42 and with sufficient compressive strength to resist the high obturation pressure of chamber 14, and so that straps 38 and 40 have sufficient tensile strength to withstand belt pull.
  • thermoplastic material such as acrylonitrile
  • the combination comprising a caseless round of ammunition provided with an annular channel therearound, gun structure including a split chamber formed by two breech sections axially displaceable relative to each other from an open position for receiving said round therebetween and a closed position wherein said round is inclosed for discharge, and an ammunition belt link comprising an O ring receivable by said annular channel, and means integral with said O ring for joining said O ring with another thereof to form an ammunition belt, said channel and said O ring being so disposed in cooperation that said O ring extends radially from said channel between said breech sections when in their closed positions to seal the junction therebetween and retains said round in said link during movement to said gun structure and between said breech sections, said joining means comprising a pair of straps extending diametrically from said O ring, one of said straps comprising a pair of tabs extending oppositely from the free end thereof and the other of said straps comprising an elongated slot disposed adjacent the free end thereof for receiving the tabs of an adjacent
  • thermoplastic material consists of acrylonitrile.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

A combination link and seal unit for caseless rounds when used with a split chamber gun with relatively displaceable chamber sections, such unit comprising an O ring which retains the caseless round when the unit functions as a link and which acts also to seal the junction of the chamber sections when the retained round is located therein for discharge. Extending diametrically from the O ring is a female strap and a male strap for interconnecting one unit to another to form an ammunition belt.

Description

United States Patent Wiese 1 Jan. 23, 1973 541 LINK-SEAL UNIT FOR CASELESS 3,170,401 2/1965 Johnson et al. "102/43 P AMMUNITION 3,313,245 5/1967 Ferri et al. ..89/35 R 3,424,089 l/l969 Humpherson ..lO2/43 P [75] Inventor: Harold H. Wiese, Davenport, Iowa [73] Assignee: The United States of America as FOREIGN PATENTS OR APPLICATIONS represented by the Secretary of the 93,842 3/1922 Switzerland ..89/26 Army Primary ExaminerStephen C. Bently [22] Filed: July 1970 Attorney-Harry M. Saragovitz, Edward J. Kelly, Her- [21] Appl. N0.: 57,604 bert Berl and Albert E. Arnold, Jr.
[57] ABSTRACT [52] U.S. Cl. ..89/17, 42/15, 89/26,
89/35 A lO2/D|G 1 A combination link and seal unit for caseless rounds [5 Int. Cl. when used with a Split chamber gun With relatively (11S- [58] Field of SearChNmS9/26, 17, 35 R, 35 A; 42/15, placeable chamber sections, such unit comprising an 42/39.? 102/43 P DIG 1 O ring which retains the caseless round when the unit functions as a link and which acts also to seal the junc- References Cited tion of the chamber sections when the retained round is located therein for discharge. Extending diametri- UNITED STATES PATENTS cally from the O ring is a female strap and a male strap for interconnecting one unit to another to form 3,009,394 11/1961 Kamp et al. ..89/35 A an ammunition belt 3,626,620 12/1971 Rocha 3,429,220 2/1969 Goode ..89/35 R 4 Claims, 4 Drawing Figures PATENTEDJAHZB I975 3,712,172
SHEET 2 OF 2 INVENTOR Hutu ii H Wi ESE.
ATTORNEYS LINK-SEAL UNIT FOR CASELESS 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.
BACKGROUND OF THE INVENTION This invention relates to seals for obturating split chambers in a gun and to interconnecting links for feeding rounds to the gun and pertains more particularly to a unit which performs both functions and is adapted for use with caseless ammunition.
In the development of caseless ammunition, which will result in a much simpler and therefore lighter gun, will reduce considerably the weight of the ammunition required for the gun, and will eliminate the problem pertaining to the disposal of the expended cartridge cases, problems have arisen as to finding other means for performing these functions performed in conventional guns by the metallic cartridge case. There is also the problem of feeding caseless rounds to the gun because the rather fragile nature of caseless rounds eliminates the conventional type of links which require that the cartridges be stripped therefrom.
SUMMARY OF THE INVENTION The present invention successfully overcomes some of these problems by including in an ammunition belt link an O ring which acts as the round retainer means so that besides providing soft contact between the link and the caseless round to prevent damage thereto it also acts as a seal for obturating the junction formed between the relatively moving breech sections when the round is used in a split-chamber gun and the sections are closed.
It is therefore a principal object of this invention to provide for caseless ammunition, when used with a split-chamber gun, a unit which combines the seal for obturating the junction formed by the relatively moving chamber sections when closed with the ammunition belt link for feeding the round to the gun.
It is a further object of this invention to include in such a unit an O ring which acts as a round retainer when the unit functions as a link and as a seal for obturating the junction between the chamber sections when closed over the round.
It is another object of this invention to provide such a unit which may be molded as a single unit from suitable plastic material.
Further objects and advantages of the invention will be apparent from the following specification and the accompanying drawings which are for the purpose of illustration only.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinally cross-sectioned view of the split chamber portion of a gun and shows the chamber sections in their open positions and a caseless round located therebetween;
FIG. 2 is a view similar to FIG. 1 but shows the chamber sections in their closed positions with a round located in the completed chamber;
FIG. 3 is a cross-sectional view taken along line 33 of FIG. 1; and
FIG. 4 is a perspective view of the seal and link combination unit.
DESCRIPTION OF A PREFERRED EMBODIMENT Shown in the drawings is a firearm breech 12 comprising a chamber 14 to receive for discharge a caseless round 16 of telescopic configuration wherein projectile 18 is initially located within an axial bore I9 through body 20 composed of a molded propellant material. Breech I2 is divided, approximately equally, into a front section 22 with an open rear end 24 and a rear section 26 with an open front end 28. Sections 22 and 26 are axially displaceable relative to each other, by firearm structure not shown, between an open position, wherein ends 24 and 28 are spaced apart sufficiently to permit longitudinal location of round 16 therebetween, by a firearm firing mechanism not shown, and a closed position wherein the ends are in contact and chamber 14 is fully completed to enclose for discharge the round located therein. When sections 2.2 and 26 are in their closed positions, ends 24 and 28 meet approximately midway the length of round 16 in chamber 14.
Installed on each round 16 is a link and seal unit 30 through which, as hereinafter described, the junction of ends 24 and 28 is sealed gas tight and a plurality of the rounds are interconnectable to form a linked belt, as shown in FIG. 3. Unit 30, as shown in FIG. 4, comprises an O ring 34 and a pair of straps, including a female strap 38 and a male strap 40, extending diametrically therefrom. O ring 34 is partially received by an annular channel 42 located around body 20 approximately midway the length thereof so as to coincident with the junction of ends 24 and 28 when sections 22 and 26 are in their closed positions, as shown in FIG. 2. Channel 42 is formed so as to receive less than one-half of the cross-sectional area of O ring 34 so that more than onehalf the cross-sectional area thereof, noted at 36, protrudes from body 20. Formed around the junctions of each end 24 and 28 with the respective portions of chamber 14 is an annular groove 46 having a cross-section which conforms with one-half that of protruding portion 36 of O ring 34 so that when sections 22 and 26 are in closed positions, as shown in FIG. 2, the protruding portion is snugly received between the grooves. Diametrical recesses 43 in end 24 cooperate with similar recesses 45 in end 26 to provide clearances for female strap 38 and male strap 40 when sections 24 and 26 are in closed positions.
The free end of female strap 38 is increased in width to permit formation therein of a slot 44 which is elongated normal to the longitudinal axis of the strap so that the length of the slot is equal to the width of male strap 40. A pair of tabs 48 extend oppositely from the free end of male strap 40 and such tabs when deformed and slot 44 is cooperatively deformed] therewith permit the insertion of the male strap on one unit 30 through the slot in the female strap of another unit thereby to interconnect two units together.
Unit 30 is preferably molded in one piece from glass fiber filled thermoplastic material such as acrylonitrile so that O ring 34 has just enough elongation, about 5-8 percent, to allow it to be forced over body 20 into channel 42 and with sufficient compressive strength to resist the high obturation pressure of chamber 14, and so that straps 38 and 40 have sufficient tensile strength to withstand belt pull.
I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.
1 claim:
1. The combination comprising a caseless round of ammunition provided with an annular channel therearound, gun structure including a split chamber formed by two breech sections axially displaceable relative to each other from an open position for receiving said round therebetween and a closed position wherein said round is inclosed for discharge, and an ammunition belt link comprising an O ring receivable by said annular channel, and means integral with said O ring for joining said O ring with another thereof to form an ammunition belt, said channel and said O ring being so disposed in cooperation that said O ring extends radially from said channel between said breech sections when in their closed positions to seal the junction therebetween and retains said round in said link during movement to said gun structure and between said breech sections, said joining means comprising a pair of straps extending diametrically from said O ring, one of said straps comprising a pair of tabs extending oppositely from the free end thereof and the other of said straps comprising an elongated slot disposed adjacent the free end thereof for receiving the tabs of an adjacent link inserted therein.
2. The invention as defined in claim 1 wherein said O ring is formed from a suitable flexible material to facilitate installation of said O ring into said channel and provide soft contact of said O ring with said round when installed in said channel.
3. The invention as defined in claim 1 wherein said O ring and said straps are formed from glass fiber thermoplastic material.
4. The invention as defined in claim 1 wherein said thermoplastic material consists of acrylonitrile.

Claims (4)

1. The combination comprising a caseless round of ammunition provided with an annular channel therearound, gun structure including a split chamber formed by two breEch sections axially displaceable relative to each other from an open position for receiving said round therebetween and a closed position wherein said round is inclosed for discharge, and an ammunition belt link comprising an O ring receivable by said annular channel, and means integral with said O ring for joining said O ring with another thereof to form an ammunition belt, said channel and said O ring being so disposed in cooperation that said O ring extends radially from said channel between said breech sections when in their closed positions to seal the junction therebetween and retains said round in said link during movement to said gun structure and between said breech sections, said joining means comprising a pair of straps extending diametrically from said O ring, one of said straps comprising a pair of tabs extending oppositely from the free end thereof and the other of said straps comprising an elongated slot disposed adjacent the free end thereof for receiving the tabs of an adjacent link inserted therein.
2. The invention as defined in claim 1 wherein said O ring is formed from a suitable flexible material to facilitate installation of said O ring into said channel and provide soft contact of said O ring with said round when installed in said channel.
3. The invention as defined in claim 1 wherein said O ring and said straps are formed from glass fiber thermoplastic material.
4. The invention as defined in claim 1 wherein said thermoplastic material consists of acrylonitrile.
US00057604A 1970-07-23 1970-07-23 Link-seal unit for caseless ammunition Expired - Lifetime US3712172A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024144A1 (en) * 1979-08-01 1981-02-25 Junker Systems, Inc. Caseless ammunition projectile having separate propellant charge and hand firearm for firing same
FR2511499A1 (en) * 1981-08-17 1983-02-18 Diehl Gmbh & Co DEVICE FOR FEEDING AND COLLECTING AMMUNITION WITHOUT SOCKETS
EP0612970A1 (en) * 1993-02-24 1994-08-31 Mauser-Werke Oberndorf GmbH Cartridge belt made of flexible material
US20040069173A1 (en) * 2002-10-15 2004-04-15 Mark Key Projectile for rapid fire gun
US20150285605A1 (en) * 2011-01-14 2015-10-08 Pcp Tactical, Llc Polymer-based machine gun belt links and cartridge casings and manufacturing method
US9599443B2 (en) 2010-07-30 2017-03-21 Pcp Tactical, Llc Base insert for polymer ammunition cartridges
US10794671B2 (en) 2011-01-14 2020-10-06 Pcp Tactical, Llc Polymer-based cartridge casing for subsonic ammunition
US11448491B2 (en) 2018-07-30 2022-09-20 Pcp Tactical, Llc Polymer cartridge with enhanced snapfit metal insert and thickness ratios
US12247818B2 (en) 2018-07-30 2025-03-11 Pcp Tactical, Llc Polymer ammunition article designed for use across a wide temperature range
US12247819B2 (en) 2010-07-30 2025-03-11 Pcp Tactical, Llc Two-piece insert and/or flash tube for polymer ammunition cartridges

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH93842A (en) * 1921-02-17 1922-03-16 Ludorf Ernst Lock on firearms for caseless bullet cartridges.
US3009394A (en) * 1960-07-12 1961-11-21 Ewald A Kamp Ammunition link
US3170401A (en) * 1962-09-11 1965-02-23 Walter T Johnson Cartridge case
US3318245A (en) * 1964-08-21 1967-05-09 Ferri Giampiero Ammunition for toy guns
US3424089A (en) * 1965-07-08 1969-01-28 Imp Metal Ind Kynoch Ltd Cartridge cases
US3429220A (en) * 1965-10-11 1969-02-25 Basil Wanless Kelley Goode Small arms ammunition belt
US3626620A (en) * 1969-01-15 1971-12-14 Maremont Corp Gun having a floating firing chamber

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH93842A (en) * 1921-02-17 1922-03-16 Ludorf Ernst Lock on firearms for caseless bullet cartridges.
US3009394A (en) * 1960-07-12 1961-11-21 Ewald A Kamp Ammunition link
US3170401A (en) * 1962-09-11 1965-02-23 Walter T Johnson Cartridge case
US3318245A (en) * 1964-08-21 1967-05-09 Ferri Giampiero Ammunition for toy guns
US3424089A (en) * 1965-07-08 1969-01-28 Imp Metal Ind Kynoch Ltd Cartridge cases
US3429220A (en) * 1965-10-11 1969-02-25 Basil Wanless Kelley Goode Small arms ammunition belt
US3626620A (en) * 1969-01-15 1971-12-14 Maremont Corp Gun having a floating firing chamber

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024144A1 (en) * 1979-08-01 1981-02-25 Junker Systems, Inc. Caseless ammunition projectile having separate propellant charge and hand firearm for firing same
FR2511499A1 (en) * 1981-08-17 1983-02-18 Diehl Gmbh & Co DEVICE FOR FEEDING AND COLLECTING AMMUNITION WITHOUT SOCKETS
EP0612970A1 (en) * 1993-02-24 1994-08-31 Mauser-Werke Oberndorf GmbH Cartridge belt made of flexible material
US20040069173A1 (en) * 2002-10-15 2004-04-15 Mark Key Projectile for rapid fire gun
US6862996B2 (en) 2002-10-15 2005-03-08 Mark Key Projectile for rapid fire gun
US20060011088A1 (en) * 2002-10-15 2006-01-19 Key Mark B Projectile for rapid fire gun
US7395762B2 (en) 2002-10-15 2008-07-08 Key Mark B Projectile for rapid fire gun
US9599443B2 (en) 2010-07-30 2017-03-21 Pcp Tactical, Llc Base insert for polymer ammunition cartridges
US12247819B2 (en) 2010-07-30 2025-03-11 Pcp Tactical, Llc Two-piece insert and/or flash tube for polymer ammunition cartridges
US9194680B2 (en) * 2011-01-14 2015-11-24 Pcp Tactical, Llc Polymer-based machine gun belt links and cartridge casings and manufacturing method
US10794671B2 (en) 2011-01-14 2020-10-06 Pcp Tactical, Llc Polymer-based cartridge casing for subsonic ammunition
US11353299B2 (en) 2011-01-14 2022-06-07 Pcp Tactical, Llc Polymer-based cartridge casing for subsonic ammunition
US11976911B2 (en) 2011-01-14 2024-05-07 Pcp Tactical, Llc Polymer-based cartridge casing for subsonic ammunition
US20150285605A1 (en) * 2011-01-14 2015-10-08 Pcp Tactical, Llc Polymer-based machine gun belt links and cartridge casings and manufacturing method
US12410994B2 (en) 2011-01-14 2025-09-09 Pcp Tactical, Llc Polymer-based cartridge casing for subsonic ammunition
US11448491B2 (en) 2018-07-30 2022-09-20 Pcp Tactical, Llc Polymer cartridge with enhanced snapfit metal insert and thickness ratios
US12163770B2 (en) 2018-07-30 2024-12-10 Pcp Tactical, Llc Polymer cartridge with enhanced snapfit metal insert and thickness ratios
US12247818B2 (en) 2018-07-30 2025-03-11 Pcp Tactical, Llc Polymer ammunition article designed for use across a wide temperature range

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