US2901973A - Diaphragm means for subcalibre non-spinning projectiles - Google Patents

Diaphragm means for subcalibre non-spinning projectiles Download PDF

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Publication number
US2901973A
US2901973A US470432A US47043254A US2901973A US 2901973 A US2901973 A US 2901973A US 470432 A US470432 A US 470432A US 47043254 A US47043254 A US 47043254A US 2901973 A US2901973 A US 2901973A
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US
United States
Prior art keywords
funnel
projectile
centering
bore
shaped member
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
US470432A
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English (en)
Inventor
Donner Hans Otto
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Individual
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Individual
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Publication date
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Publication of US2901973A publication Critical patent/US2901973A/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
    • F42B14/061—Sabots for long rod fin stabilised kinetic energy projectiles, i.e. multisegment sabots attached midway on the projectile
    • 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
    • F42B10/04—Stabilising arrangements using fixed fins
    • F42B10/06—Tail fins

Definitions

  • the present invention relates to diaphragm means for sub-calibre fin-stabilized projectiles, particularly such as are adapted to be fired from smooth-bored field mortars.
  • the invention is particularly concerned with the stabilizing of projectiles to be fired from barrels of an internal diameter greater than the external diameter of the projectile.
  • the present invention eliminates the above mentioned defects while at the same time attaining a notable improvement over the prior art with consequent economy of production and improved firing range and accuracy.
  • a diaphragm means comprising essentially a funnel-shaped member for the rear end of the projectile and adapted to be inserted in the barrel bore and provided with an open tip end rearwardly directed when in said bore, an internal funnel surface conforming, at least at the mouth end thereof, to the external surface of the corresponding part of the rear end of the projectile for insuring centering of the projectile in the funnel-shaped member while maintaining the friction between the surfaces within desired limits, openings in the Walls of the member located rearwardly of the open end tip for permitting powder gases to issue therethrough, a ring shaped powder gas check packing abutting the bore wall at the funnel mouth end thereof, and centering means concentric with said internal funnel surface and adapted to extend from the outer wall of the funnel-shaped member to the bore wall for centering the internal funnel surface and projectile relative the barrel axis.
  • the means for centering the fore end of the funnelshaped member are advantageously provided at the funnel mouth portion thereof and preferably shaped so the outer surface about the funnel mouth of the said member will function both as centering means and as packing means.
  • the same is provided with, for example, at least three projecting pieces which are spaced apart to form equal angles therebetween and which extend to the bore wall, concentric with the internal funnel surface.
  • the funnel surface and the rear end of the projectile there is provided some suitable matter adapted to promote sliding of the projectile.
  • a structure embodying the present invention is illustrated by way of example in the accompanying drawing which is an elevational view of a projectile in position within a mortar barrel and provided with a diaphragm means in accordance with the present invention and shown partly in longitudinal section.
  • the diaphragm means includes a funnelshaped member B having an internal frusto-conical recess D for the rear end of a projectile E and an open tip end P.
  • the open tip end of the funnel-shaped member has threaded thereto a tubular extension piece H with a bore hole advantageously somewhat greater in diameter than that of the tip end opening F and with holes K made in the walls thereof for passage of gases of combustion.
  • a centrally bored centering member G with radial fins G at least three in number To the other end of the tubular piece H is rigidly secured, by means of a threaded nut I, a centrally bored centering member G with radial fins G at least three in number.
  • the front end of the funnelshaped member B or, at least, the fore end of the internal funnel surface of the member is centered by an outer peripheral surface G positioned about the funnel mouth and provided with a peripheral groove mounting a powder gas check packing C.
  • the diaphragm means according to the present invention is advantageously made of some suitable light metal.
  • Diaphragm means for use with sub-calibre nonspinning projectiles adapted to be fired from a field mortar having a barrel with smooth internal bore comprising a funnel-shaped member independent of and for accommodating the rear end of the projectile and adapted for being inserted into the barrel, said member defining a rear tip opening, said funnel-shaped member having a peripheral configuration at its front end conforming closely with the bore of the barrel and having at its front end a frusto-conical recess conforming at least at the mouth end thereof to the external shape of the rear end of the projectile to insure centering of the projectile in said funnel-shaped member and for releasably supporting the projectile, said funnel-shaped member defining openings located rearwardly of said rear tip opening for the passage of gases of combustion therethrough, spaced centering members extending from the funnel-shaped member to the wall of the barrel bore for centering said recess and the projectile relativethe barrel bore axis, and a powder gas check packing on the front end of the funnel-shaped member
  • Means according to claim 1 including a tubular extension piece secured to the rear end of the funnelshaped member and having a bore hole wider than the rear tip opening of the funnel-shaped member and holes extending radially from the bore hole, one of the centering members being secured to the rear end of said extension and having fins extending radially therefrom to the wall of the barrel bore.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Toys (AREA)
  • Testing Of Engines (AREA)
US470432A 1953-12-10 1954-11-22 Diaphragm means for subcalibre non-spinning projectiles Expired - Lifetime US2901973A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI320790X 1953-12-10

Publications (1)

Publication Number Publication Date
US2901973A true US2901973A (en) 1959-09-01

Family

ID=8556071

Family Applications (1)

Application Number Title Priority Date Filing Date
US470432A Expired - Lifetime US2901973A (en) 1953-12-10 1954-11-22 Diaphragm means for subcalibre non-spinning projectiles

Country Status (6)

Country Link
US (1) US2901973A (fr)
BE (1) BE526652A (fr)
CH (1) CH320790A (fr)
DE (1) DE1009067B (fr)
FR (1) FR1102985A (fr)
GB (1) GB753630A (fr)

Cited By (5)

* 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
US3157126A (en) * 1962-02-01 1964-11-17 Blondeau Roland Gilber Auguste Missile for sporting guns
US3238875A (en) * 1962-04-27 1966-03-08 Dynamit Nobel Ag Rocket shell construction
US4611540A (en) * 1983-02-09 1986-09-16 Affarsverket Ffv Mortar ammunition
EP0506150A2 (fr) * 1991-01-31 1992-09-30 Bofors AB Dispositif de propulsion pour une grenade de mortier

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371666A1 (fr) * 1976-11-23 1978-06-16 Alsetex Tube empenne pour grenade a fusil
GR65959B (fr) * 1977-10-26 1981-01-09 Rheinmetall Gmbh
FR2490805B1 (fr) * 1980-09-23 1985-10-31 France Etat Projectile empenne du type fleche
DE3932952A1 (de) * 1989-10-03 1991-04-11 Rheinmetall Gmbh Wuchtgeschoss
SE528624C2 (sv) 2005-11-15 2007-01-09 Bae Systems Bofors Ab Underkalibrerad granat med lång räckvidd

Citations (4)

* 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.
FR812680A (fr) * 1936-01-21 1937-05-14 Brev Etudes Soc Nouveaux perfectionnements aux armes à feu ou autres
US2247563A (en) * 1939-10-18 1941-07-01 Robert S Spalding Projectile
US2383053A (en) * 1942-04-18 1945-08-21 Martin C Mogensen Mounting device for projectiles

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE301298C (fr) *
US1209611A (en) * 1916-02-29 1916-12-19 Henry C Mustin Projectile.
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
FR543611A (fr) * 1921-11-16 1922-09-06 Obus perfectionné pour canons se chargeant par la gueule ou par la culasse
FR831022A (fr) * 1937-03-31 1938-08-18 Perfectionnements aux projectiles empennés
GB585794A (en) * 1942-07-30 1947-02-25 Charles Dennistoun Burney Improvements in or relating to gun fired projectiles

Patent Citations (4)

* 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.
FR812680A (fr) * 1936-01-21 1937-05-14 Brev Etudes Soc Nouveaux perfectionnements aux armes à feu ou autres
US2247563A (en) * 1939-10-18 1941-07-01 Robert S Spalding Projectile
US2383053A (en) * 1942-04-18 1945-08-21 Martin C Mogensen Mounting device for projectiles

Cited By (7)

* 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
US3157126A (en) * 1962-02-01 1964-11-17 Blondeau Roland Gilber Auguste Missile for sporting guns
US3238875A (en) * 1962-04-27 1966-03-08 Dynamit Nobel Ag Rocket shell construction
US4611540A (en) * 1983-02-09 1986-09-16 Affarsverket Ffv Mortar ammunition
EP0506150A2 (fr) * 1991-01-31 1992-09-30 Bofors AB Dispositif de propulsion pour une grenade de mortier
US5175393A (en) * 1991-01-31 1992-12-29 Swedish Ordnance - Ffv/Bofors Ab Device in a launch unit for a mortar projectile
EP0506150A3 (en) * 1991-01-31 1993-02-24 Swedish Ordnance - Ffv/Bofors Ab Propelling device for a mortar projectile

Also Published As

Publication number Publication date
GB753630A (en) 1956-07-25
BE526652A (fr)
FR1102985A (fr) 1955-10-27
DE1009067B (de) 1957-05-23
CH320790A (de) 1957-04-15

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