US3143074A - Projectile for a mortar having a nonrifled bore - Google Patents

Projectile for a mortar having a nonrifled bore Download PDF

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Publication number
US3143074A
US3143074A US120429A US12042961A US3143074A US 3143074 A US3143074 A US 3143074A US 120429 A US120429 A US 120429A US 12042961 A US12042961 A US 12042961A US 3143074 A US3143074 A US 3143074A
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US
United States
Prior art keywords
ring
projectile
launching
tube
recesses
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
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US120429A
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English (en)
Inventor
Jasse Joseph Raymond
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.)
Hotchkiss Brandt SA
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Hotchkiss Brandt SA
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Filing date
Publication date
Application filed by Hotchkiss Brandt SA filed Critical Hotchkiss Brandt SA
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Publication of US3143074A publication Critical patent/US3143074A/en
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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
    • F42B14/02—Driving bands; Rotating bands
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B30/00—Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
    • F42B30/08—Ordnance projectiles or missiles, e.g. shells
    • F42B30/10—Mortar projectiles

Definitions

  • the present invention relates to projectiles for mortars, which have a non-rifled bore and are loaded through the muzzle and more particularly to finned projectiles.
  • this ring must become detached from the projectile when the latter leaves the motar but it sometimes remains on the body of the projectile or even travels along the latter and becomes hooked on the projectile fins which in either case exerts a drag on the projectile on its trajectory and results in the projectile falling short of the target and may also considerably increase the dispersion in direction.
  • the object of the invention is to provide a projectile of the aforementioned known type having a sealing ring of plastic material disposed in a groove in the body of 3,143,974 Patented Aug. 4,1964
  • this groove is arranged to have a conical bottom having the aforementioned slope and two rounded end faces or fillets.
  • FiG. 1 is a diagrammatic longitudinal. and diametral sectional view of a projectile according to the invention
  • FIG. 2 is a partial longitudinal sectional view on an enlarged scale of the guide and sealing portion of the projectile and of the adjacent gun tube;
  • PEG. 3 is a front elevational view of the sealing ring in the free state
  • FIG. 4 is a front elevational view of another embodiment of the sealing ring for the projectile according to the invention.
  • FIG. 5 is a partial view of the ring shown in FIG. 4 on an enlarged scale.
  • the invention is applied to a projectile P whose body 1 of conventional shape is provided at its forward end with a screw-threaded aperture 2 for receiving a fuze and at its rear end with a wall 3 having on its outer face a blind hole 4 provided for the attachment of a projectile fin arrangement (not shown in the drawings).
  • the body 1 comprises on its outer face 5 a portion ab which corresponds to the maximum diameter of the body and is, for example, cylindrical and is provided for the guiding of the projectile against the smooth inner face S of the gun tube T.
  • the longitudinal section bc of the groove 6 in a radial axial plane intersecting the longitudinal axis X--X of the projectile comprises:
  • a forward fillet having a part-circular section be, a centre 0 and a radius r;
  • a rear part-circular fillet de composed approximately of a quarter of a circle and having a radius r equal to that of the forward fillet, its centre 0 being located at a distance from the axis X-X of the projectile which is roughly equal to that of the corner or edge e constituting the rear end of the groove 6.
  • the elastic ring '7 is composed of a plastic material.
  • a plastic material for this there could be used, for example, the material known under the trade name Rilsan which is a superpolyamide produced by the French Company Organico or the material known under the trade name Nylon and in a general way the various polyamides and superpolyamides, their copolymers, the polyethylenes and any other substances having similar physical properties.
  • the ring 7 has in its free state 7 (FIG. 3) a circular circumference less than that of the groove 6 at the deepest point d of the latter and a cross-sectional shape having a radius r so that when this ring is disposed in the groove it is put under peripheral stress and its cross-section has a radius approximately equal to the radius r of the fillets of the groove.
  • D is the diameter of the smooth inner face S of the gun tube T
  • D is the diameter of the cylindrical portion ab corresponding to the calibre of the projectile P
  • D is the diameter corresponding to the deepest point d of the groove
  • D is the diameter corresponding to the point e of the rear end of the groove
  • the ring provides in this position relative to the face S a clearance substantially equal to the clearance i.
  • the ring in its free state (FIG. 3) the ring includes a number of rupture-initiating notches 8 provided on the outer and/or inner face of the ring.
  • the number of these notches is not critical, there being provided preferably three or four notches.
  • the projectile according to the invention operates in the following manner:
  • FIGS. 4 and 5 show another embodiment of the sealing ring 7 which is in the form of a tore and has a cir cular cross-sectional shape and a number of large recesses 8 and 3 disposed facing each other in pairs.
  • the sealing ring 7 which is in the form of a tore and has a cir cular cross-sectional shape and a number of large recesses 8 and 3 disposed facing each other in pairs.
  • four pairs of recesses are provided, the pairs being at to each other.
  • These recesses have a concave bottom and, when viewed in side elevation, a part-circular or an approximately partcircular shape. Being placed facing each other in pairs, these recesses sufliciently reduce at y the radial thickness of the ring to facilitate the rupture of the latter as soon as the projectile leaves the gun tube without rendering the ring fragile in the course of handling.
  • y could be about 0.8 mm.
  • R radius of the recesses 8 could be about 8.1 mm.
  • a projectile adapted to be fired by a launching charge from a launching gun tube and provided with a sealing ring of expandable material and having an outside diameter smaller than the inside diameter of the launching tube and combined with an annular recess in the projectile for sealing radial clearance between the projectile and the launching tube, the ring being ordinarily located at the rear end of the recess and the recess having a forwardly divergent annular face which closely engages the ring so as to expand the ring as the ring is urged forwardly relative to the projectile by the launching charge, the provision of small recesses on a periphery of the ring, said recesses forming throughway passages between the ring and one of two elements consisting of the launching tube and the divergent face, whereby when the projectile is launched the hot gases of the launching charge urge the ring forwardly in sealing engagement with the launching tube and the destructive effect of a small proportion of said gases passing through said passages reduces the tensile strength of the launching
  • a projectile adapted to be fired by a launching charge from a launching gun tube and provided with a sealing ring of expandable material and having an outside diameter smaller than the inside diameter of the launching tube and combined with an annular recess in the projectile for sealing radial clearance between the projectile and the launching tube, the ring being ordinarily located at the rear end of the recess and the recess having a forwardly divergent annular face which closely engages the ring so as to expand the ring as the ring is urged forwardly relative to the projectile by the launching charge, the provision of small recesses on the inner and outer peripheries of the ring, said recesses forming pairs of throughway passages in different radial planes of the projectile between the ring and the launching tube and the divergent face, whereby when the projectile is launched the hot gases of the launching charge urge the ring forwardly in sealing engagement with the launching tube and the destructive effect of a small proportion of said gases passing through said passages reduces the
  • a projectile adapted to be fired by a launching charge from a launching gun tube and provided with a sealing ring of expanded material and having an outside diameter smaller than the inside diameter of the launching tube and combined with an annular recess in the projectile for sealing radial clearance between the projectile and the launching tube, the ring being ordinarily located at the rear end of the recess and under circumferential tension at said rear end, the combination of small recesses on a periphery of the ring, said recesses forming throughway passages between the ring and one of two elements consisting of the launching tube and the divergent face, and a cross-sectional shape of the ring in radial planes of the projectile which has a curved contour providing a point contact between the ring and the launching tube and between the ring and the divergent face in said radial planes, whereby when the projectile is launched the hot gases of the launching charge urge the ring forwardly in sealing engagement with the launching tube and the destructive effect of
  • a projectile adapted to be fired by a launching charge from a launching gun tube and provided with a sealing ring of expandable synthetic plastics material and having an outside diameter smaller than the inside diameter of the launching tube and combined with an annular recess in the projectile for sealing radial clearance between the projectile and the launching tube, the ring being ordinarily located at the rear end of the recess and the recess having a forwardly divergent annular face which closely engages the ring so as to expand the ring as the ring is urged forwardly relative to the projectile by the launching charge, the combination of small recesses on a periphery of the ring, said recesses forming throughway passages between the ring and one of two elements consisting of the launching tube and the divergent face and a round cross-sectional shape of the ring in radial planes of the projectile, whereby when the projectile is launched the hot gases of the launching charge urge the ring forwardly in sealing engagement with the launching tube and the
  • a projectile adapted to be fired by a launching charge from a launching gun tube and provided with a round-sectional sealing ring of expandable synthetic plastics material and having an outside diameter smaller than the inside diameter of the launching tube and combined with an annular recess in the projectile for sealing radial clearance between the projectile and the launching tube, the ring being ordinarily located at the rear end of the recess and the recess having a forwardly divergent annular face which closely engages the ring so as to expand the ring as the ring is urged forwardly relative to the projectile by the launching charge, the provision of small recesses on the inner and outer peripheries of the ring, said recesses forming pairs of throughway passages in diiferent radial planes of the projectile between the ring and the launching tube and the divergent: face, the radius of the round section of the ring being about 1.5 times the radial thickness of the ring between each pair of recesses, each of said recesses having in

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
US120429A 1960-06-29 1961-06-28 Projectile for a mortar having a nonrifled bore Expired - Lifetime US3143074A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR831545A FR1270551A (fr) 1960-06-29 1960-06-29 Projectile perfectionné pour mortier à âme lisse
FR862012A FR79793E (fr) 1960-06-29 1961-05-16 Projectile perfectionné pour mortier à âme lisse

Publications (1)

Publication Number Publication Date
US3143074A true US3143074A (en) 1964-08-04

Family

ID=39274407

Family Applications (1)

Application Number Title Priority Date Filing Date
US120429A Expired - Lifetime US3143074A (en) 1960-06-29 1961-06-28 Projectile for a mortar having a nonrifled bore

Country Status (9)

Country Link
US (1) US3143074A (de)
BE (1) BE605184A (de)
CH (1) CH369683A (de)
DE (1) DE1148161B (de)
ES (1) ES269007A1 (de)
FI (1) FI48304C (de)
FR (2) FR1270551A (de)
GB (1) GB933114A (de)
NL (2) NL6709693A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3613596A (en) * 1969-03-04 1971-10-19 Forsvarets Fabriksverk Projectile for a muzzle loading rifle-bore mortar
DE3114080A1 (de) * 1981-04-08 1982-11-11 Rheinmetall GmbH, 4000 Düsseldorf Einrichtung zum fuehren einer geschossanordnung in einem glattrohr
US4385561A (en) * 1981-02-02 1983-05-31 The United States Of America As Represented By The Secretary Of The Army Launch tube bore rider
US4413567A (en) * 1979-09-08 1983-11-08 Etablissement Salgad Fin-stabilized mortar grenade
US4444113A (en) * 1981-04-06 1984-04-24 The United States Of America As Represented By The Secretary Of The Army High-pressure self-sealing obturator in sabot discard projectile
US4552071A (en) * 1982-06-15 1985-11-12 United Technologies Corporation Two-piece despin obturator
US20190323808A1 (en) * 2016-12-16 2019-10-24 Bae Systems Plc Mortar bomb

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242961A (en) * 1978-10-23 1981-01-06 Martin Marietta Corporation Chevron grooved decoupling obturator
DE3033042C2 (de) * 1980-09-03 1985-06-27 L'Etat Français représenté par le Délégué Général pour l'Armement, Paris Mittel zum Forcieren während der Schußentwicklung bei Munition für eine Glattrohrwaffe
DE3443195A1 (de) * 1984-11-27 1986-05-28 Diehl GmbH & Co, 8500 Nürnberg Gefechtskopf eines grosskalibrigen geschosses oder einer rakete
FR2585988B1 (fr) * 1985-08-09 1987-11-20 Thomson Brandt Armements Projectile de mortier notamment a grande portee
ES8706942A1 (es) * 1986-04-16 1987-07-01 Esperanza & Cie Sa Granada para mortero
EP3351891A1 (de) * 2017-01-18 2018-07-25 BAE SYSTEMS plc Mörserbombe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB507107A (en) * 1937-02-26 1939-06-09 Sageb Sa Improvements in or relating to projectiles for rifled arms
US2325560A (en) * 1938-07-30 1943-07-27 Wauters Jean Ordnance
US2616372A (en) * 1945-08-02 1952-11-04 Rudolph O Frantik Projectile
US3023704A (en) * 1957-07-29 1962-03-06 Dawson Philip John Projectiles for mortars and like projectors

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL32909C (de) * 1930-06-16
FR815222A (fr) * 1936-03-16 1937-07-08 Ceinture expansible pour obus empennés

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB507107A (en) * 1937-02-26 1939-06-09 Sageb Sa Improvements in or relating to projectiles for rifled arms
US2325560A (en) * 1938-07-30 1943-07-27 Wauters Jean Ordnance
US2616372A (en) * 1945-08-02 1952-11-04 Rudolph O Frantik Projectile
US3023704A (en) * 1957-07-29 1962-03-06 Dawson Philip John Projectiles for mortars and like projectors

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3613596A (en) * 1969-03-04 1971-10-19 Forsvarets Fabriksverk Projectile for a muzzle loading rifle-bore mortar
US4413567A (en) * 1979-09-08 1983-11-08 Etablissement Salgad Fin-stabilized mortar grenade
US4385561A (en) * 1981-02-02 1983-05-31 The United States Of America As Represented By The Secretary Of The Army Launch tube bore rider
US4444113A (en) * 1981-04-06 1984-04-24 The United States Of America As Represented By The Secretary Of The Army High-pressure self-sealing obturator in sabot discard projectile
DE3114080A1 (de) * 1981-04-08 1982-11-11 Rheinmetall GmbH, 4000 Düsseldorf Einrichtung zum fuehren einer geschossanordnung in einem glattrohr
US4552071A (en) * 1982-06-15 1985-11-12 United Technologies Corporation Two-piece despin obturator
US20190323808A1 (en) * 2016-12-16 2019-10-24 Bae Systems Plc Mortar bomb
US10473442B1 (en) * 2016-12-16 2019-11-12 Bae Systems Plc Mortar bomb

Also Published As

Publication number Publication date
ES269007A1 (es) 1962-01-01
GB933114A (en) 1963-08-08
FR1270551A (fr) 1961-09-01
FR79793E (fr) 1963-01-25
CH369683A (fr) 1963-05-31
FI48304B (de) 1974-04-30
DE1148161B (de) 1963-05-02
NL6709693A (de) 1967-09-25
NL266519A (de)
BE605184A (fr) 1961-10-16
FI48304C (fi) 1974-08-12

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