EP0640205A1 - Etui pour munition de type telescopee. - Google Patents
Etui pour munition de type telescopee.Info
- Publication number
- EP0640205A1 EP0640205A1 EP94909162A EP94909162A EP0640205A1 EP 0640205 A1 EP0640205 A1 EP 0640205A1 EP 94909162 A EP94909162 A EP 94909162A EP 94909162 A EP94909162 A EP 94909162A EP 0640205 A1 EP0640205 A1 EP 0640205A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plug
- envelope
- case
- annular
- case according
- 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.)
- Granted
Links
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 23
- 230000002093 peripheral effect Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 19
- 230000002787 reinforcement Effects 0.000 claims description 18
- 238000010304 firing Methods 0.000 claims description 16
- 239000011324 bead Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 239000003380 propellant Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Classifications
-
- 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
- F42B5/045—Cartridges, i.e. cases with charge and missile of telescopic type
Definitions
- the field of the present invention is that of cases for telescoped type ammunition.
- An ammunition type 5 telescoped known by patent FR2679991 which comprises a case constituted by a '•% plastic casing, closed at each end by a cap, also made of material plastically
- a plastic material to manufacture the case makes it easier to extract the latter 10 out of the weapon after firing.
- the plastic case does not exhibit residual radial expansion.
- the patent FR2679991 proposes to have metal reinforcing means at the level of the part of the plugs which is located outside the casing of the case. These reinforcing means consist of a ring which can be optionally supplemented at the base with a plate.
- the subject of the invention is a case for ammunition of the telescoped type and consisting of a cylindrical plastic casing carrying at each end a plastic cap fitted of a metallic reinforcing means which comprises a peripheral cylindrical part and an external rim or a bottom, reinforcing means which completely covers one end of the plug extending out of the envelope, case characterized in that it comprises at least an annular space, arranged on the plug in the vicinity of one end of the envelope in contact with the reinforcing means, space intended to absorb the deformation of the plug during firing and making it possible to avoid the formation of a bead.
- the reinforcing means will be constituted for the front plug by a metal ring comprising a peripheral cylindrical part and an external rim and for the rear plug by a metal plate comprising a bottom and a peripheral cylindrical part.
- the cylindrical part and the external rim prevent the formation when an annular bead is pulled from the front part of the case.
- the annular space makes it possible to absorb the expansion of the plastic material of the stopper and thus prevents the formation of a bead between the case and the means of reinforcement of the stopper.
- the plate completely covers the rear end of the rear plug and maintains this part of the plug which would be intended to come into contact with the weapon.
- the cylindrical part and the bottom thus prohibit the formation during the firing of an annular bead at the rear part of the case, the annular space making it possible to absorb the expansion of the plastic material of the stopper.
- the annular space is delimited by two annular surfaces substantially flat and normal to the axis of the ammunition, one carried by the reinforcement means and the other carried by the plug.
- the reinforcement means is made integral with the stopper by hooking an annular fold carried by the reinforcement means on a peripheral groove of the stopper.
- the reinforcing means have an external diameter at least equal to the nominal diameter of the envelope at the maximum temperature of use of the case.
- At least one internal annular cavity is arranged between the front plug and the reinforcement ring so as to allow the axial and radial deformations of the plug caused by the passage of the projectile to be absorbed.
- At least one plug has a peripheral annular groove intended to be opposite the envelope, and the envelope is deformed during assembly so as to penetrate into the groove of the plug to secure the latter. with the envelope.
- the deformation may be carried out at points regularly distributed angularly.
- the invention also relates to a munition of the telescoped type comprising such a case inside which is disposed a projectile, a propellant charge and a device for igniting the propellant charge.
- FIG. 1 represents in axial section a telescoped munition comprising a case according to the invention
- FIG. 2 is an external view of the front part of the case according to the invention.
- FIG. 3 represents in axial section and on a larger scale the ends of a munition according to an alternative embodiment of the invention.
- a case for a telescoped type of munition 1 is constituted by a cylindrical casing 2 made of plastic material, closed at its ends by two plugs 3a, 3b also made of plastic.
- the case is intended to contain a projectile 4 as well as a propellant charge (not shown).
- the projectile sketched in FIG. 1 is a projectile of the under-calibrated type stabilized by empennage, but another type of projectile in particular a caliber projectile could be put in place in such a case.
- the front plug 3a is equipped with a metallic reinforcement means 5 which is a ring whose external diameter is at least equal to the nominal diameter of the casing 2 at the maximum temperature of use of the ammunition.
- the ring 5 has a peripheral cylindrical part 6 and an external rim 7 and it covers a front end 8 of the plug which extends outside the casing 2.
- the ring 5 By completely covering the front end of the stopper, the ring 5 maintains this part of the stopper which is intended to come into contact with the weapon.
- the cylindrical part 6 and the rim 7 thus prohibit the formation during the firing of an annular bead at the front part of the case.
- the internal diameter of the ring 5 is less than or equal to the internal diameter of the front plug 3a, while being sufficient to allow the passage of the projectile 4.
- the ring 5 constitutes an abutment surface which allows the front part of the plug to be maintained 3a during the passage of the projectile 4.
- the ring 5 therefore prohibits the tearing of the material constituting the stopper 3a when the projectile is fired, which allows the front stopper 3a to perform its function of guiding the projectile during its exit from the case.
- An annular space 20a is arranged on the plug 3a opposite an end 21a of the casing 2 which comes into contact with the reinforcing ring 5.
- This annular space allows the shot to absorb at this level the deformation of the front plug 3a.
- An annular cavity 9 is arranged between the front plug 3a and the reinforcing ring 5.
- This cavity absorbs the axial and radial deformation of the plug 3a which is caused by the passage of the projectile during firing, which prevents tearing of the material constituting the plug 3a during firing of the projectile and allows the front plug 3a to ensure its projectile guidance function during its exit from the case.
- the dimensioning of the annular space and cavity will be carried out according to the values of the operating pressures and the deformation characteristics of the material constituting the plug.
- a rear part of the plug 3a has a sealing lip 10a which is slightly over-calibrated with respect to the casing 2. Such a lip is described by patent FR2679991.
- the connection of the plug 3a and the reinforcement ring 5 is obtained by hooking an annular fold 11a carried by the ring 5 on a peripheral groove 12a arranged on the plug.
- the reinforcement ring is put in place by means of a press.
- the annular fold 11a is applied against the plug 3a and produces an elastic deformation of the material constituting the latter to come into place in the groove 12a.
- the plug 3a also includes an annular groove 13a which is arranged opposite the internal surface of the envelope 2.
- the cap When mounting the ammunition, after placing the projectile inside the case, the cap is returned before secured to the casing 2 by punctually deforming the latter so as to make it penetrate into the annular groove 13.
- the rear plug 3b of the case is equipped with a metallic reinforcement means which is a plate 15 having a bottom 16 and a peripheral cylindrical part 17.
- the cylindrical part 17 has an external diameter which is at least equal to the nominal diameter of the casing 2 at the maximum temperature of use of the munition.
- the case therefore thus comprises a metallic cylindrical part (6 and 17) disposed at each of its ends.
- These cylindrical parts have a diameter at least equal to the nominal diameter of the casing 2 at the maximum temperature of use of the ammunition. They therefore have a diameter which is always greater than or equal to the diameter of the envelope whatever the temperature of use.
- Such an arrangement ensures good centering of the holster in the chamber of the weapon regardless of the temperature of the holster and in particular when the temperature is very low and the casing 2 of plastic material then has a minimum diameter.
- the bottom 16 and the cylindrical part 17 cover a rear end 18 of the plug 3b which extends out of the envelope.
- the plate 15 has a bore intended to receive an igniter 19 of the type described by patent FR2679994.
- the plate 15 By completely covering the end 18 of the rear plug 3b, the plate 15 maintains this part of the plug which would be intended to come into contact with the weapon.
- the plate thus prohibits the formation when firing an annular bead at the rear part of the case.
- An annular space 20b is arranged on the rear plug 3b opposite an end 21b of the casing 2 which comes into contact with the reinforcing plate 15.
- This annular space allows the shot to absorb at this level the deformation of the rear plug 3b. This avoids the formation of a bead of the material constituting the rear plug 3b between the end 21b of the envelope and the reinforcement plate 15 during firing.
- the dimensioning of the annular space will be carried out according to the values of the pressures of use and the characteristics of deformation of the material constituting the plug.
- the plug 3b also has a sealing lip 10b which is slightly over-calibrated with respect to the casing 2.
- the connection of the plug 3b and the plate 15 is obtained by the attachment of an annular fold 11b carried by the plate 15 on a peripheral groove 12b arranged on the plug.
- the positioning of the plate is carried out by means of a press in a manner similar to that described previously for the front plug 3a.
- the plug 3b has, like the front plug 3a, an annular groove 13b disposed opposite the internal surface of the envelope 2. And the envelope 2 has punctual deformations 14, regularly distributed angularly, which secure the rear plug 3b and of the envelope.
- the front plug 3a is also equipped with a metallic reinforcement means which is a ring 5 comprising a peripheral cylindrical part 6 and an external rim 7 and covering a front end 8 of the plug which s extends out of envelope 2.
- a metallic reinforcement means which is a ring 5 comprising a peripheral cylindrical part 6 and an external rim 7 and covering a front end 8 of the plug which s extends out of envelope 2.
- the end 21a of the casing 2 abuts on a shoulder 22a arranged on the ring 5.
- the annular space 20a is disposed on the plug 3a and substantially opposite the end 21a of the envelope 2 This space is delimited by two annular surfaces
- annular space is then simply defined by an appropriate choice of the respective lengths of the ring 5 and of the plug 3a.
- This arrangement also makes it possible to distribute the deformation of the material of the ring over a larger surface and in an axial direction.
- the length of the shoulder 22a arranged on the ring will be chosen so that, when firing after displacement of the plugs by the action of the gas pressure, the case is still slightly engaged on the reinforcing ring.
- annular cavity 9 is arranged between the front plug 3a and the reinforcing ring 5.
- connection of the plug 3a and the reinforcement ring 5 is obtained by hooking an annular fold 11a carried by the ring 5 on a peripheral groove 12a arranged on the plug.
- the relative conicities of the annular fold 11a and of the peripheral groove 12a are here slightly different, which makes it possible to arrange a conical clearance 25 between the ring 5 and the plug 3a, clearance which communicates with the annular space 20a.
- This game has the same function as the annular cavity 9 and also makes it possible to absorb the axial and radial deformations of the plug caused by the passage of the projectile during firing.
- the rear plug 3b is equipped with a metallic reinforcement means which is a plate 15 having a bottom 16 and a peripheral cylindrical part 17. The end 21b of the casing 2 abuts on a shoulder 22b arranged on the plate 15.
- An annular space 20b is arranged on the rear plug 3b substantially facing one end 21b of the casing 2 which comes into contact with the reinforcing plate 15.
- This space is also delimited by two annular surfaces 23b, 24b substantially flat and normal to the axis of the ammunition, one (23b) carried by the reinforcement plate 15 and the other (24b) carried by the plug 3b .
- connection of the plug 3b and the plate 15 is obtained by attaching an annular fold 11b carried by the plate 15 on a peripheral groove 12b arranged on the plug. No tapered clearance is provided between fold and groove.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Fluid-Damping Devices (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Jib Cranes (AREA)
- Closures For Containers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9302895 | 1993-03-12 | ||
FR9302895A FR2702555B1 (fr) | 1993-03-12 | 1993-03-12 | Etui pour une munition de type télescopée. |
PCT/FR1994/000253 WO1994020814A1 (fr) | 1993-03-12 | 1994-03-08 | Etui pour munition de type telescopee |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0640205A1 true EP0640205A1 (fr) | 1995-03-01 |
EP0640205B1 EP0640205B1 (fr) | 1996-07-17 |
Family
ID=9444916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94909162A Expired - Lifetime EP0640205B1 (fr) | 1993-03-12 | 1994-03-08 | Etui pour munition de type telescopee |
Country Status (6)
Country | Link |
---|---|
US (1) | US5433148A (fr) |
EP (1) | EP0640205B1 (fr) |
AT (1) | ATE140532T1 (fr) |
DE (1) | DE69400306T2 (fr) |
FR (1) | FR2702555B1 (fr) |
WO (1) | WO1994020814A1 (fr) |
Families Citing this family (93)
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US6748870B2 (en) | 2001-10-22 | 2004-06-15 | Armtec Defense Products Company | Ammunition round assembly with combustible cartridge case |
WO2003046469A1 (fr) | 2001-11-27 | 2003-06-05 | Armtec Defense Products Co. | Ensemble de munition a etui combustible telescope |
US7363861B2 (en) * | 2004-08-13 | 2008-04-29 | Armtec Defense Products Co. | Pyrotechnic systems and associated methods |
US8146502B2 (en) | 2006-01-06 | 2012-04-03 | Armtec Defense Products Co. | Combustible cartridge cased ammunition assembly |
US20100274544A1 (en) * | 2006-03-08 | 2010-10-28 | Armtec Defense Products Co. | Squib simulator |
US7913625B2 (en) * | 2006-04-07 | 2011-03-29 | Armtec Defense Products Co. | Ammunition assembly with alternate load path |
US20090308274A1 (en) * | 2008-06-11 | 2009-12-17 | Lockheed Martin Corporation | Integrated Pusher Plate for a Canister- or Gun-Launched Projectile and System Incorporating Same |
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CH611703A5 (en) * | 1976-02-17 | 1979-06-15 | Kupag Kunststoff Patent Verwal | Cartridge for firearms, especially rifles |
US4691638A (en) * | 1985-04-30 | 1987-09-08 | Honeywell Inc. | Cased telescoped ammunition |
US5127331A (en) * | 1991-03-25 | 1992-07-07 | Olin Corporation | Reduced recoil compression formed shotshell casing |
FR2679991B1 (fr) * | 1991-07-31 | 1993-10-29 | Giat Industries | Perfectionnements apportes a une munition en particulier du type telescope. |
-
1993
- 1993-03-12 FR FR9302895A patent/FR2702555B1/fr not_active Expired - Fee Related
-
1994
- 1994-03-08 US US08/325,276 patent/US5433148A/en not_active Expired - Lifetime
- 1994-03-08 EP EP94909162A patent/EP0640205B1/fr not_active Expired - Lifetime
- 1994-03-08 AT AT94909162T patent/ATE140532T1/de not_active IP Right Cessation
- 1994-03-08 WO PCT/FR1994/000253 patent/WO1994020814A1/fr active IP Right Grant
- 1994-03-08 DE DE69400306T patent/DE69400306T2/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9420814A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5433148A (en) | 1995-07-18 |
ATE140532T1 (de) | 1996-08-15 |
DE69400306D1 (de) | 1996-08-22 |
EP0640205B1 (fr) | 1996-07-17 |
WO1994020814A1 (fr) | 1994-09-15 |
DE69400306T2 (de) | 1997-02-20 |
FR2702555A1 (fr) | 1994-09-16 |
FR2702555B1 (fr) | 1995-04-28 |
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