US2788744A - Projectile for mortar - Google Patents

Projectile for mortar Download PDF

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Publication number
US2788744A
US2788744A US360559A US36055953A US2788744A US 2788744 A US2788744 A US 2788744A US 360559 A US360559 A US 360559A US 36055953 A US36055953 A US 36055953A US 2788744 A US2788744 A US 2788744A
Authority
US
United States
Prior art keywords
projectile
barrel
mortar
centering
tube
Prior art date
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
Application number
US360559A
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English (en)
Inventor
Donner Hans Otto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SOLTAM Ltd
Original Assignee
SOLTAM Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SOLTAM Ltd filed Critical SOLTAM Ltd
Application granted granted Critical
Publication of US2788744A publication Critical patent/US2788744A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/02—Stabilising arrangements
    • F42B10/14—Stabilising arrangements using fins spread or deployed after launch, e.g. after leaving the barrel

Definitions

  • This invention relates. tonew andvery practicable improvementsrin projectiles forinfantry mortars, with a view to increase their-initial velocity and to lengthen their range.
  • the infantry mortar is a weapon provided with a smooth-bored barrel for ejecting fin-stabilized projectiles atanangle of elevation usuallyexceeding 30 degrees, with the breech end of the barrel being supported during ejection by means ofa ball or cardan. type joint on a base plate and with the muzzleportion of the barrel attached by means of a springconnectorto a cradle suitably supported by a bipod or tripod.
  • a primary object of the present inventiou is to produce for existing mortars alight weight projectile that, while allowing a high initial velocity, has a good ballistic co efiicient and thus results in long range and good target accuracy.
  • the invention is characterizein-that the projectile is ejected through an unrifled barrel by using a combined thrust and centering device on the projectile.
  • a thrust and centering device on the projectile.
  • Fig. 1 shows a mortar projectile, constructed in accordance with the invention and provided with a thrust and centering device, inserted in a mortar barrel and viewed from one side, with the upper part of the'projectile shown in longitudinal section.
  • Fig. 2 shows the sameprojectile and its retainer device viewed fromthe front end.
  • Fig. 3 shows a mortar projectile in accordance with a modification of the present invention and provided with.
  • Fig. 4 shows armortar projectile in. accordance with a further modification of the present invention inserted into Patented Apr. 16, 1957 the barrel of a mortanwith part shown in longitudinal ICE ' section.
  • the mortar projectile according to the first form of thepresent inventionzshown' in Figs. 1 and 2 is shown in position in the barrel 1 of a mortar.
  • the projectile comprises a body 3. provided at its front end with a detonatplosiongases from'escapingxbetween the inner'periphery of the barrell and thethrustplate.
  • the body 3 of theprojectile rests against the thrust plate-6 by means of the projecting rear-end 5 and with the fore end of the-projectile againstthefore part of a centering device 9and more particularly against thering surface 8 thereof.
  • the centering device consists of atube '17 substantially as long as the projectile, the diameter ofits fore:part fitting with a sliding fitinto the barrel l'of the mortar and the diameter of the rearpart beingslightly smaller.
  • the centeringdevice is attached by means of threads to the thrust plate 6.
  • the rear part of the thrust device is;provided with circumferentially extended slots 10 and i1 and extended from the front end up to the slots 10 and 11, a number of longitudinal-extended slots: inthe modification shown'in Figs. 1 and 2, there are four slots 12, 13, Hand 15.
  • the tube like' centering device is divided by the longitudinalislots into foursegments.
  • the fore part of the centering-device is also provided with a shallow, circumferential groove 16' inwhich there is during transport a belt and a safety wire for preventing the segments from opening. Thisis removed before inserting the projectile into the barrel.
  • a projectile constructed in accordance with Figs. 1 and 2 is used as follows: The projectile is inserted from the rear into the tube 17 in such a way that the fore end of the projectile body rests against the ring-like inner surface 8 of the tube. The fins of the projectile tail 4 are now freely within'the rear end of the tube.
  • the thrust-plate dis screwed into the rear end of the centering tube and'into engagement with the projecting rear end 5 of the tail to center'the projectile exactly on the center line of the tube.
  • the safety ring is first removed from the groove 16 and the projectile'is dropped in the usual way into the mortar barrel.
  • firing occurs either when the projectile hits the bottom of the barrel or by means of a firing mechanism at the moment required.
  • the stability of the projectile can be made good. This is entirely possible on account of the pressure of the basic charge powder gas not being able to aifect in any way the fin group at'the firing moment.
  • Fig. 3 shows a mortar projectile consistent with this invention and having unfolding fins and separate centering components at the fore end of the projectile.
  • the reference numeral 1 designates the 'muzzle part of a mortar barrel 1, 2' the fuse of the mortar projectile and 3 the body of the projectile, 4 the tail tube with fins 6' capable of pivoting outward around pins 5.
  • a centering ring 7' of light metal encircles the rear end of the projectile and rests against the rear surface of the body and at the same time func tioning as thrust component.
  • the fore end of the projectile is provided with slightly rearward slanting borings 8 in end of which a spiral spring and a pin 9 are inserted.
  • the pin in the projcctile is provided with a safety ring that prevents the springs from pressing the pins 9 out of the borings 8'.
  • the mortar projectile is provided with a basic charge tube and fixed fins as well as with a centering device and a thrust plate, mortar with the upper part of the projectile shown in longitudinal section up to the centre line.
  • the numeral la indicates the mortar barrel in longitudinal section
  • the numeral 2a indicates the fuse of the projectile
  • the numeral 4a the basic charge tube with its radially located borings
  • the numeral 5a the tail with its fixed fins.
  • the tail and rear end of the projectile is encircled by a ring-like part 6a the fore part of which forms the thrust plate 7a bearing on the internal surface of the barrel 1a.
  • the inside of the ring-like part 6a is provided with the grooves 8a in which the fins are capable of moving in the longitudinal direction of the barrel.
  • the front edge of the ring-like part 6a and so also the inner edge of the thrust plate 7:: are supported along the ring-like surface 9a against the body of the projectile.
  • the fore part of the projectile is provided with slots 10a parallel to the longitudinal axis, and towards the rear end of each slot there is a pin 11a.
  • a movable centering lug 12a On each pin Illa there is hinged a movable centering lug 12a which is fitted with a spiral spring in such a way that if the external end of centering device is released from the position shown in the figure, the device turns forward to the position 12 indicated by dash-lines.
  • the device described herein functions, when firing, as follows: When the projectile is inserted into the barrel and firing occurs, the powder gases thrust the ring-like 'part 611, made of light metal, and its thrust plate 7a,
  • the centering lugs 12a center the fore part of the projectile on the center line of the barrel. As the projectile leaves the barrel, the centering lugs 12a are turned forward and in spite of air resistance are folded into the slots 10a thus making the tip of the projectile completely streamlined. Simultaneously the resistance of air frees the thrust plate 7a from the projectile body and the plate is left behind as the fins of the projectile tail move forwards along the grooves 8a of the tube-like part. The projectile now continues its flight alone.
  • the invention comprises a number of various applications for centering a mortar projectile in the barrel and at the same time, by using a thrust plate, very high initial velocities and long ranges with good target accuracy are obtainable with constructions consistent with the invention.
  • a motor projectile with thrust plate and centering device and consistent with the invention can also otherwise be produced within the limits of the invention.
  • the projectiles described above are only some structural principles. In the above description it has been stated that the centering device or devices fall apart under the effect of air resistance or spring force. Of course, it is also possible to design constructions in which the residual gases compressed in the centering device at the moment of discharge open or disassemble the centering device by means of the expansion of the residual powder gases as the projectile leaves the mortar barrel.
  • Projectiles provided with a centering and thrust device similar to and consistent with the invention are capable of initial velocities of 400 to 500 metres per second and, correspondingly ranges exceeding 20,0000 metres when used in standard weapons having a calibre of 4 to 8 inches.
  • a fin-stabilized under-caliber projectile for discharge from a smooth-bored mortar barrel comprising an elongated forwardly and rearwardly tapering body having radially extended fins at its rear end, and a centering tube enclosing at least the rear end portion and fins of said body, said centering tube having a rearwardly facing thrust surface to be exposed to the explosive pressures in the barrel for propelling the projectile body and centering tube out of the barrel and being rearwardly reenclosing said body from its rear end to a point slightly rearward of the point of greatest diameter on said body, said fins being pivotally mounted within slots defined in the rear end portion of the body and held in collapsed position within said slots by said tube, the forward part of said tube being formed with rearwardly inclined, ra-
  • a fin-stabilized under-caliber projectile for discharge from a smooth-bored mortar barrel comprising an elongated forwardly and rearwardly tapering body having radially extended fins at its rear end, and a centering tube enclosing at least the rear end portion and fins of said body, said centering tube having a rearwardly facing thrust surface to be.
  • said tube enclosing said body from its rear end to a point slightly rearward of the point of greatest diameter on said body, said tube having an external diameter throughout most of its length which is smaller than the internal diameter of the barrel and having a front end portion enlarged to the 5 internal diameter of said barrel to provide said thrust surface, said body having radially opening slots forward of said tube, and centering lugs pivotally mounted in said slots and resiliently urged to inoperative position within said slots upon discharge of said projectile from the barrel.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Toys (AREA)
US360559A 1953-04-27 1953-06-09 Projectile for mortar Expired - Lifetime US2788744A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI320789X 1953-04-27

Publications (1)

Publication Number Publication Date
US2788744A true US2788744A (en) 1957-04-16

Family

ID=8556070

Family Applications (1)

Application Number Title Priority Date Filing Date
US360559A Expired - Lifetime US2788744A (en) 1953-04-27 1953-06-09 Projectile for mortar

Country Status (5)

Country Link
US (1) US2788744A (de)
BE (1) BE524168A (de)
CH (1) CH320789A (de)
DE (1) DE1103813B (de)
FR (1) FR1090057A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015991A (en) * 1958-10-29 1962-01-09 Jr Ernest E Forbes Projectile launching device
US3038382A (en) * 1958-09-26 1962-06-12 William R Noyes Bore riders for launching of projectiles
US3084599A (en) * 1961-02-01 1963-04-09 Atlantic Res Corp Rocket launchers
US3089388A (en) * 1959-11-27 1963-05-14 Atlantic Res Corp Rocket launchers
US3135161A (en) * 1961-08-08 1964-06-02 Frederick A Oyhus Expendable-piston tube missile launcher
US4693434A (en) * 1984-09-22 1987-09-15 Rheinmetall Gmbh Self-deploying stabilizing-vane assembly for projectile
EP0264546A2 (de) * 1986-10-21 1988-04-27 Rheinmetall GmbH Treibkäfig-Fluggeschoss-Anordnung
US4860661A (en) * 1987-11-06 1989-08-29 Diehl Gmbh & Co. Saboted projectile with propellant cage
US4920889A (en) * 1987-07-23 1990-05-01 Rheinmetall Gmbh Fin stabilized, subcaliber propelling cage sobot projectile
US5339743A (en) * 1993-07-12 1994-08-23 Remington Arms Company, Inc. Ammunition system comprising slug holding sabot and slug type shot shell
US5481981A (en) * 1993-09-08 1996-01-09 Rheinmetall Gmbh Sabot for a subcaliber projectile
US5493974A (en) * 1991-07-17 1996-02-27 Steyr-Daimler-Puch Ag Saboted projectile with sub-caliber core projectile and discarding cage
US5644100A (en) * 1996-08-19 1997-07-01 The United States Of America As Represented By The Secretary Of The Army Sabot for high-dispersion shot shell
US5773751A (en) * 1994-05-10 1998-06-30 Bofors Liab Ab Shell for gun with smooth-bore barrel
US20100101444A1 (en) * 2008-10-27 2010-04-29 Schluckebier David K Wad with ignition chamber
US20100192794A1 (en) * 2009-02-02 2010-08-05 R.A. Brands, L.L.C. Shotshell wad with shot confinement feature
US8800449B2 (en) 2008-10-27 2014-08-12 Ra Brands, L.L.C. Wad with ignition chamber
WO2020141290A1 (en) * 2019-01-04 2020-07-09 The Secretary Of State For Defence Captive piston projectile and method of manufacture

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1180277B (de) * 1958-03-11 1964-10-22 Hans Wimmer Abschussvorrichtung fuer Weltraum- und Fernraketen
DE1163193B (de) * 1960-03-26 1964-02-13 Aircraft Armaments Inc Treibspiegel fuer Geschosse mit hoher Geschwindigkeit
FR2445509A1 (fr) * 1978-12-28 1980-07-25 Thomson Brandt Mecanisme de lancement d'un projectile sous-calibre
DE3309533A1 (de) * 1983-03-17 1984-09-20 Diehl GmbH & Co, 8500 Nürnberg Fluegelstabilisiertes geschoss mit treibkaefig
DE3314749A1 (de) * 1983-04-23 1984-10-25 L'Etat Français représenté par le Délégué Général pour l'Armement, Paris Segmentierter treibkaefig
US4735148A (en) * 1986-03-18 1988-04-05 United Technologies Corporation Plastic composite sabot

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US195040A (en) * 1877-09-11 Improvement in projectiles for smooth-bore cannon
FR496879A (fr) * 1918-03-21 1919-11-19 John William Rooney Perfectionnements apportés aux obus utilisés à la guerre
US2465401A (en) * 1943-09-23 1949-03-29 Leslie A Skinner Rocket fin assembly
US2616372A (en) * 1945-08-02 1952-11-04 Rudolph O Frantik Projectile

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB131034A (en) * 1918-03-28 1919-08-21 Leonard Godfrey Pinney Thring Improvements in or relating to Subcalibre Projectiles.
FR496991A (fr) * 1919-01-02 1919-11-21 Humbert Bourdiol Forme rationnelle à donner aux projectiles de tous calibres et aux véhicules maritimes et aériens, pour une récupération d'énergie dépensée
DE344998C (de) * 1920-10-03 1921-12-03 Harry Moeller Doppelt verjuengtes Geschoss
BE379532A (de) * 1930-05-22
FR715385A (fr) * 1931-08-10 1931-12-02 Empennage repliable pour bombes d'aviation
FR804237A (fr) * 1935-03-04 1936-10-19 Anciens Ets Skoda Dispositif destiné à augmenter la vitesse des projectiles
DE704406C (de) * 1937-01-20 1941-03-29 Waffen Und Munitionsfabriken A Unterkalibergeschoss
GB585794A (en) * 1942-07-30 1947-02-25 Charles Dennistoun Burney Improvements in or relating to gun fired projectiles
GB560931A (en) * 1942-08-24 1944-04-27 Gordon Alexander Allan King Improvements in or relating to projectiles
GB576217A (en) * 1943-03-08 1946-03-25 Ladislas Permutter Improvements in projectiles
FR990154A (fr) * 1944-03-08 1951-09-18 Projectile de forme aérodynamique ou hydrodynamique à ailettes avec embase détachable
FR1016766A (fr) * 1950-04-27 1952-11-21 Perfectionnements aux projectiles sous-calibrés

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US195040A (en) * 1877-09-11 Improvement in projectiles for smooth-bore cannon
FR496879A (fr) * 1918-03-21 1919-11-19 John William Rooney Perfectionnements apportés aux obus utilisés à la guerre
US2465401A (en) * 1943-09-23 1949-03-29 Leslie A Skinner Rocket fin assembly
US2616372A (en) * 1945-08-02 1952-11-04 Rudolph O Frantik Projectile

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038382A (en) * 1958-09-26 1962-06-12 William R Noyes Bore riders for launching of projectiles
US3015991A (en) * 1958-10-29 1962-01-09 Jr Ernest E Forbes Projectile launching device
US3089388A (en) * 1959-11-27 1963-05-14 Atlantic Res Corp Rocket launchers
US3084599A (en) * 1961-02-01 1963-04-09 Atlantic Res Corp Rocket launchers
US3135161A (en) * 1961-08-08 1964-06-02 Frederick A Oyhus Expendable-piston tube missile launcher
US4693434A (en) * 1984-09-22 1987-09-15 Rheinmetall Gmbh Self-deploying stabilizing-vane assembly for projectile
EP0264546A2 (de) * 1986-10-21 1988-04-27 Rheinmetall GmbH Treibkäfig-Fluggeschoss-Anordnung
EP0265369A2 (de) * 1986-10-21 1988-04-27 Rheinmetall GmbH Treibkäfig geringer Eigenmasse für ein unterkalibriges Hochgeschwindigkeits-Fluggeschoss
EP0264546A3 (de) * 1986-10-21 1989-01-11 Rheinmetall GmbH Treibkäfig-Fluggeschoss-Anordnung
EP0265369A3 (en) * 1986-10-21 1989-01-25 Rheinmetall Gmbh Small weight sabot for a high-velocity subcalibre projectile
US4850280A (en) * 1986-10-21 1989-07-25 Rheinmetall Gmbh Propelling cage projectile arrangement
US4920889A (en) * 1987-07-23 1990-05-01 Rheinmetall Gmbh Fin stabilized, subcaliber propelling cage sobot projectile
US4860661A (en) * 1987-11-06 1989-08-29 Diehl Gmbh & Co. Saboted projectile with propellant cage
US5493974A (en) * 1991-07-17 1996-02-27 Steyr-Daimler-Puch Ag Saboted projectile with sub-caliber core projectile and discarding cage
US5339743A (en) * 1993-07-12 1994-08-23 Remington Arms Company, Inc. Ammunition system comprising slug holding sabot and slug type shot shell
US5481981A (en) * 1993-09-08 1996-01-09 Rheinmetall Gmbh Sabot for a subcaliber projectile
US5773751A (en) * 1994-05-10 1998-06-30 Bofors Liab Ab Shell for gun with smooth-bore barrel
US5644100A (en) * 1996-08-19 1997-07-01 The United States Of America As Represented By The Secretary Of The Army Sabot for high-dispersion shot shell
US20100101444A1 (en) * 2008-10-27 2010-04-29 Schluckebier David K Wad with ignition chamber
US8220393B2 (en) 2008-10-27 2012-07-17 Ra Brands, L.L.C. Wad with ignition chamber
US8800449B2 (en) 2008-10-27 2014-08-12 Ra Brands, L.L.C. Wad with ignition chamber
US9500453B2 (en) 2008-10-27 2016-11-22 Ra Brands, L.L.C. Wad with ignition chamber
US20100192794A1 (en) * 2009-02-02 2010-08-05 R.A. Brands, L.L.C. Shotshell wad with shot confinement feature
US8555785B2 (en) 2009-02-02 2013-10-15 Ra Brands, L.L.C. Shotshell wad with shot confinement feature
WO2020141290A1 (en) * 2019-01-04 2020-07-09 The Secretary Of State For Defence Captive piston projectile and method of manufacture
US11662186B2 (en) 2019-01-04 2023-05-30 The Secretary Of State For Defence Captive piston projectile and method of manufacture

Also Published As

Publication number Publication date
FR1090057A (fr) 1955-03-28
CH320789A (de) 1957-04-15
DE1103813B (de) 1961-03-30
BE524168A (de)

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