US3899978A - Fin-stabilized subcaliber projectile - Google Patents

Fin-stabilized subcaliber projectile Download PDF

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Publication number
US3899978A
US3899978A US379970A US37997073A US3899978A US 3899978 A US3899978 A US 3899978A US 379970 A US379970 A US 379970A US 37997073 A US37997073 A US 37997073A US 3899978 A US3899978 A US 3899978A
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United States
Prior art keywords
segments
disk
cage
projectile
fin
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Expired - Lifetime
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US379970A
Inventor
Hans Werner Luther
Rudolf Romer
Jurgen Winkelmann
Winfried Rossmann
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Rheinmetall Industrie AG
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Rheinmetall GmbH
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Priority claimed from DE19722236142 external-priority patent/DE2236142C3/en
Application filed by Rheinmetall GmbH filed Critical Rheinmetall GmbH
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Publication of US3899978A publication Critical patent/US3899978A/en
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/06—Sub-calibre projectiles having sabots; Sabots therefor
    • F42B14/061—Sabots for long rod fin stabilised kinetic energy projectiles, i.e. multisegment sabots attached midway on the projectile

Definitions

  • ABSTRACT A fin-stabilized subcaliber projectile, which comprises a projectile body including a central portion.
  • a drive cage surrounds the central portion of the projectile body.
  • the drive cage includes a plurality of segments held together by suitable means and covered by a common sealing disc on its rear side.
  • the sealing disc lies in front of a guide or fin assembly arranged at the rear.
  • the rear of the drive cage is formed as a frustocone, and the sealing disc on the rear side is shaped such that as a result of gas pressure developed upon firing, the drive-cage segments are pushed with radial force against the projectile body.
  • the present invention relates to a fin-stabilized subcaliber projectile having a drive cage, surrounding the body of the projectile in its center region, said cage consisting of a plurality of segments which are held together by suitable means and are covered by a common sealing disk at the rear, the disk in its turn lying in front of the guide or fin assembly arranged at the rear (see U.S. Pat. No. 3,620,167).
  • the drive cage is of such a nature that the drive-cage segments, after the emergence of the projectile from the barrel, can loosen and detach themselves from the body of the projectile, so that they are positively cast out of the path of the fin mechanism which extends far beyond the diameter of the projectile body.
  • the drive cage in accordance with the present invention represents an optimum solution to problems which may arise.
  • the projectile includes a drive cage which is suitable to receive and transmit high gas pressures to the body of the projectile.
  • FIG. 1 is a section through the drive cage in accordance with the present invention.
  • FIG. 2 is an elevational view, partly broken away.
  • the drive cage 1 is divided into several segments so that the cage as long as the projectile body 2 provided with the guide or fin assembly 2' is in the barrel is firmly connected with the body of the projectile by transmission means 4, which are force-locked in the axial direction, in the form of a thread or of grooves.
  • the segments are held together on the outside by at least one ring-shaped band 5.
  • the rear of the drive cage 1 is designed substantially as a cone 1d (i.e. is frusto-conically forwardly divergent) and is so stepped in direction towards the body of the projectile 2 and also the circumferential surface, as to give rise to two perpendicular annular surfaces 1e and l f.
  • the sealing disk 7a is now placed over the cone 1d, as well as the annular surfaces 1e and If and fastened by screws 10 to the drive cage 1.
  • the sealing disk 7a can be connected with the drive cage also additionally or solely by an adhesive. In the case of screw fastening, it is advisable to increase the application force of the screw 10 by interposing a washer 11.
  • the sealing disk 7a and the ring-shaped band 5 to consist of a single piece.
  • the gas pressure developed upon firing can be resolved into an axial force and a radial force.
  • the radial force causes the drive cage 1 to be pressed firmly against the projectile body 2, whereby a dependable transmission to the projectile body is assured.
  • a drive cage surrounding said central portion and formed with a plurality of segments configured with internal threads to engage said formations and adapted to spread apart from said body in flight;
  • a ring surrounding said segments at an end of said cage turned toward said fins for retaining said segments temporarily together and against said body, said cage being formed at said end turned toward said fins and adjacent said ring with a frustoconical portion tapered toward said fins,
  • a frustoconical sealing disk overlying said frustoconical portion and adapted to apply radially inward force to said segments to retain them against said body upon the application of gas pressure to said disk;
  • means for securing said disk to said segments and including screws threaded into said segments through said disk and having heads outwardly of said disk and respective washers interposed between said screw head and said disk.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Of Engines (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Toys (AREA)

Abstract

A fin-stabilized subcaliber projectile, which comprises a projectile body including a central portion. A drive cage surrounds the central portion of the projectile body. The drive cage includes a plurality of segments held together by suitable means and covered by a common sealing disc on its rear side. The sealing disc lies in front of a guide or fin assembly arranged at the rear. The rear of the drive cage is formed as a frustocone, and the sealing disc on the rear side is shaped such that as a result of gas pressure developed upon firing, the drive-cage segments are pushed with radial force against the projectile body.

Description

United States Patent 1 Luther et al.
[ 1 Aug. 19, 1975 l FIN-STABILIZED SUBCALIBER PROJECTILE [73] Assignee: Rheinmetall GmbH, Dusseldorf,
Germany 22 Filed: July 17,1973
21 Appl. No.: 379,970
[30] Foreign Application Priority Data July 22, 1972 Germany 2236142 [52] U.S. Cl. 102/93 [51] Int. Cl. F42b 31/00; F42b 13/16 {58] Field of Search 102/93 [56] References Cited UNITED STATES PATENTS 3,000,316 9/1961 Dunlap et a]. 102/93 3,125,957 3/1964 Lipinski 102/93 3,430,571 3/1969 Barr [02/93 3,620,167 11/1971 Romer et a1. 102/93 FOREIGN PATENTS OR APPLICATIONS 143,675 1/1954 Sweden 102/93 Primary Examiner-Benjamin A. Borchelt Assistant ExaminerC. T. Jordan Attorney, Agent, or FirmErnest G. Montague; Karl F. Ross; Herbert Dubno [57] ABSTRACT A fin-stabilized subcaliber projectile, which comprises a projectile body including a central portion. A drive cage surrounds the central portion of the projectile body. The drive cage includes a plurality of segments held together by suitable means and covered by a common sealing disc on its rear side. The sealing disc lies in front of a guide or fin assembly arranged at the rear. The rear of the drive cage is formed as a frustocone, and the sealing disc on the rear side is shaped such that as a result of gas pressure developed upon firing, the drive-cage segments are pushed with radial force against the projectile body.
1 Claim, 2 Drawing Figures Illlllllll llllllllllllllllllll PATENTEU AUG! 9 ms II/I/I/I/I/I7IL/ III FIG.
FIN-STABILIZED SUBCALIBER PROJECTILE The present invention relates to a fin-stabilized subcaliber projectile having a drive cage, surrounding the body of the projectile in its center region, said cage consisting of a plurality of segments which are held together by suitable means and are covered by a common sealing disk at the rear, the disk in its turn lying in front of the guide or fin assembly arranged at the rear (see U.S. Pat. No. 3,620,167).
The drive cage is of such a nature that the drive-cage segments, after the emergence of the projectile from the barrel, can loosen and detach themselves from the body of the projectile, so that they are positively cast out of the path of the fin mechanism which extends far beyond the diameter of the projectile body.
In the previously employed weapons, which operate with an operational gas pressure of, for instance, max. 4500 atm. with a caliber of 105 mm, the drive cage in accordance with the present invention represents an optimum solution to problems which may arise.
Since in future weapons, inter alia, there is the requirement of higher operational gas pressures, subcaliber projectiles with the proven drive cages have been shot with a gas pressure substantially exceeding the maximum pressure.
In this connection it has now been found that the gas penetrates into the joints of the drive-cage segments and presses them although only slightly outward against the wall of the barrel. Thus the gas effects erosion between the drive-cage segments and particularly on the thread of the projectile body, so that an exact transmission of power from the drive cage to the body of the projectile can no longer be assured. The result is that the projectile does not reach its predicted target.
It is an object of the present invention to provide a fin-stabilized subcaliber projectile, while avoiding the mentioned disadvantages, the projectile includes a drive cage which is suitable to receive and transmit high gas pressures to the body of the projectile.
It is another object of the present invention to provide a fin-stabilized subcaliber projectile, i.e. of the type of U.S. Pat. No. 3,620,167, which in the rear of the drive cage is constructed as a cone and the sealing disk on the rear side is provided with a corresponding development in such a manner that as a result of the gas pressure, which is developed upon firing, the drivecage segments are acted on with a radial pressing pressure against the body of the projectile.
These and other objects will become more readily apparent from the following detailed description of the present invention, reference being made to the accompanying drawing, in which: FIG. 1 is a section through the drive cage in accordance with the present invention; and
FIG. 2 is an elevational view, partly broken away.
Referring now to the drawing, the drive cage 1 is divided into several segments so that the cage as long as the projectile body 2 provided with the guide or fin assembly 2' is in the barrel is firmly connected with the body of the projectile by transmission means 4, which are force-locked in the axial direction, in the form of a thread or of grooves. The segments are held together on the outside by at least one ring-shaped band 5.
The rear of the drive cage 1 is designed substantially as a cone 1d (i.e. is frusto-conically forwardly divergent) and is so stepped in direction towards the body of the projectile 2 and also the circumferential surface, as to give rise to two perpendicular annular surfaces 1e and l f. The sealing disk 7a is now placed over the cone 1d, as well as the annular surfaces 1e and If and fastened by screws 10 to the drive cage 1. The sealing disk 7a can be connected with the drive cage also additionally or solely by an adhesive. In the case of screw fastening, it is advisable to increase the application force of the screw 10 by interposing a washer 11. Of course it is possible within the scope of the present invention for the sealing disk 7a and the ring-shaped band 5 to consist of a single piece.
The manner of operation is as follows:
The gas pressure developed upon firing can be resolved into an axial force and a radial force. The radial force causes the drive cage 1 to be pressed firmly against the projectile body 2, whereby a dependable transmission to the projectile body is assured.
We claim:
1. In combination with a fin-stabilized subcaliber projectile having a projectile body with a central portion provided with a multiplicity of formations in the configuration of a screw thread and an end portion provided with stabilizing fins, the improvement which comprises:
a drive cage surrounding said central portion and formed with a plurality of segments configured with internal threads to engage said formations and adapted to spread apart from said body in flight;
a ring surrounding said segments at an end of said cage turned toward said fins for retaining said segments temporarily together and against said body, said cage being formed at said end turned toward said fins and adjacent said ring with a frustoconical portion tapered toward said fins,
a frustoconical sealing disk overlying said frustoconical portion and adapted to apply radially inward force to said segments to retain them against said body upon the application of gas pressure to said disk; and
means for securing said disk to said segments, and including screws threaded into said segments through said disk and having heads outwardly of said disk and respective washers interposed between said screw head and said disk.

Claims (1)

1. In combination with a fin-stabilized subcaliber projectile having a projectile body with a central portion provided with a multiplicity of formations in the configuration of a screw thread and an end portion provided with stabilizing fins, the improvement which comprises: a drive cage surrounding said central portion and formed with a plurality of segments configured with internal threads to engage said formations and adapted to spread apart from said body in flight; a ring surrounding said segments at an end of said cage turned toward said fins for retaining said segments temporarily together and against said body, said cage being formed at said end turned toward said fins and adjacent said ring with a frustoconical portion tapered toward said fins, a frustoconical sealing disk overlying said frustoconical portion and adapted to apply radially inward force to said segments to retain them against said body upon the application of gas pressure to said disk; and means for securing said disk to said segments, and including screws threaded into said segments through said disk and having heads outwardly of said disk and respective washers interposed between said screw head and said disk.
US379970A 1972-07-22 1973-07-17 Fin-stabilized subcaliber projectile Expired - Lifetime US3899978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722236142 DE2236142C3 (en) 1972-07-22 Wing-stabilized sub-caliber bullet

Publications (1)

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US3899978A true US3899978A (en) 1975-08-19

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JP (1) JPS5824720B2 (en)
BE (1) BE802463R (en)
CH (1) CH552190A (en)
FR (1) FR2193964B2 (en)
GB (1) GB1369420A (en)
IT (1) IT1045367B (en)
NL (1) NL174873C (en)
SE (1) SE406807B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284008A (en) * 1979-04-12 1981-08-18 The United States Of America As Represented By The Secretary Of The Army Double ramp discarding sabot
US4450770A (en) * 1980-09-22 1984-05-29 The United States Of America As Represented By The Secretary Of The Army Pivot ring for a discarding sabot
US4527483A (en) * 1982-12-09 1985-07-09 Precitronic Gesellschaft Fur Feinmechanik Und Electronic M.B.H. Sabot projectile guide
US4598644A (en) * 1981-12-05 1986-07-08 Rheinmetall Gmbh Use of a portion of a propellant charge as a seal
US4724770A (en) * 1980-06-26 1988-02-16 Rheinmetall Gmbh Subcaliber projectile with pivotally separable drive cage
US4901645A (en) * 1980-08-23 1990-02-20 Rheinmetall, Gmbh Inertial projectile having a breakable pre-penetrator
WO1998058227A1 (en) * 1996-05-17 1998-12-23 Primex Technologies, Inc. Pre-molded aft seal for discarding sabot projectiles
US5962807A (en) * 1996-05-17 1999-10-05 Primex Technologies, Inc. Pre-molded AFT seal for discarding sabot projectiles

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2323244C3 (en) * 1973-05-09 1979-04-19 Rheinmetall Gmbh, 4000 Duesseldorf Wing-stabilized sub-caliber bullet
GB1517205A (en) * 1975-10-17 1978-07-12 Ici Ltd Thermosetting-thermoplastic polyester composites
FR2597590B1 (en) * 1976-04-29 1988-08-26 Saint Louis Inst LAUNCHING SHOE FOR SUB-CALIBER PROJECTILES
JPS602619U (en) * 1983-06-20 1985-01-10 ハリウツド株式会社 Packaging boxes for cosmetics, etc.
GB2207985A (en) * 1987-08-14 1989-02-15 Secr Defence Sabot projectile
FR2661739A1 (en) * 1990-05-04 1991-11-08 Giat Ind Sa DEVICE FOR SEALING A BOOM PROJECTILE.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000316A (en) * 1944-07-10 1961-09-19 Henry F Dunlap Projectile
US3125957A (en) * 1964-03-24 lipinski
US3430571A (en) * 1967-05-25 1969-03-04 Aai Corp Sabot
US3620167A (en) * 1968-05-31 1971-11-16 Rheinmetall Gmbh Drive cage for wing-stabilized lowcaliber shells

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3430570A (en) * 1967-05-25 1969-03-04 Aai Corp Sabot with internal radial slots

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125957A (en) * 1964-03-24 lipinski
US3000316A (en) * 1944-07-10 1961-09-19 Henry F Dunlap Projectile
US3430571A (en) * 1967-05-25 1969-03-04 Aai Corp Sabot
US3620167A (en) * 1968-05-31 1971-11-16 Rheinmetall Gmbh Drive cage for wing-stabilized lowcaliber shells

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284008A (en) * 1979-04-12 1981-08-18 The United States Of America As Represented By The Secretary Of The Army Double ramp discarding sabot
US4724770A (en) * 1980-06-26 1988-02-16 Rheinmetall Gmbh Subcaliber projectile with pivotally separable drive cage
US4850279A (en) * 1980-06-26 1989-07-25 Firma Rheinmetall Gmbh Subcaliber projectile with pivotally separable drive cage
US4901645A (en) * 1980-08-23 1990-02-20 Rheinmetall, Gmbh Inertial projectile having a breakable pre-penetrator
US4450770A (en) * 1980-09-22 1984-05-29 The United States Of America As Represented By The Secretary Of The Army Pivot ring for a discarding sabot
US4598644A (en) * 1981-12-05 1986-07-08 Rheinmetall Gmbh Use of a portion of a propellant charge as a seal
US4527483A (en) * 1982-12-09 1985-07-09 Precitronic Gesellschaft Fur Feinmechanik Und Electronic M.B.H. Sabot projectile guide
WO1998058227A1 (en) * 1996-05-17 1998-12-23 Primex Technologies, Inc. Pre-molded aft seal for discarding sabot projectiles
US5962807A (en) * 1996-05-17 1999-10-05 Primex Technologies, Inc. Pre-molded AFT seal for discarding sabot projectiles

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Publication number Publication date
DE2236142A1 (en) 1974-02-07
FR2193964B2 (en) 1977-09-09
SE406807B (en) 1979-02-26
NL174873B (en) 1984-03-16
CH552190A (en) 1974-07-31
FR2193964A2 (en) 1974-02-22
DE2236142B2 (en) 1976-02-19
JPS5824720B2 (en) 1983-05-23
BE802463R (en) 1973-11-16
GB1369420A (en) 1974-10-09
NL174873C (en) 1984-08-16
JPS4944600A (en) 1974-04-26
IT1045367B (en) 1980-05-10
NL7307746A (en) 1974-01-24

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