EP0664877A1 - Sabot a separation controlee des segments pour projectiles sous calibres - Google Patents
Sabot a separation controlee des segments pour projectiles sous calibresInfo
- Publication number
- EP0664877A1 EP0664877A1 EP94924336A EP94924336A EP0664877A1 EP 0664877 A1 EP0664877 A1 EP 0664877A1 EP 94924336 A EP94924336 A EP 94924336A EP 94924336 A EP94924336 A EP 94924336A EP 0664877 A1 EP0664877 A1 EP 0664877A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- launcher
- sub
- annular chamber
- elements
- projectile
- 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
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
- 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
Definitions
- the present invention relates to ammunition for small, medium and large caliber weapons, and more particularly an improved launcher with controlled separation of elements, for ammunition of the type comprising an undersized bullet and a launcher, in particular for hunting weapons.
- ammunition with a sub-calibrated projectile associates a sub-projectile and a launcher whose essential function is to propel the sub-projectile at the desired speed.
- the launching techniques frequently used currently use a launcher formed from two or more elements surrounding the sub-projectile.
- the elements of the launcher assembled together in contiguous planes by a locking system, can be made of metal alloys or plastic. After firing, the aerody ⁇ namic forces exerted on the projectile at the exit of the weapon cause the separation of the elements of the launcher, from the front to the rear, thus releasing the sub-projectile.
- This separation of the launcher can be accelerated if the projectile is driven by a low speed of rotation, resulting for example from the use of a weapon with a rifled tube.
- patent FR-A-2,555,728 describes an ammunition for a hunting weapon comprising a sub-calibrated projectile stabilized by empennage, comprising a tapered bullet of dense alloy and a launcher made of plastic material.
- the patent FR-A-2,606,500 relates to a munition providing a high initial speed and limiting the violence of the recoil shock, constituted by an undersized bullet and a launcher of the caliber of the weapon, comprising an open external annular chamber, separated from the propellant charge by a partition liable to rupture under the pressure of the gases generated by the combustion of the charge, and only delimited towards the outside by the wall of the cartridge case.
- This device has the advantage of reducing the recoil shock felt by the shooter, and, at equal pressure, of increasing the initial speed of the projectile.
- the present invention relates to a device comprising a launcher associated with a sub-projectile, providing a high initial speed while limiting the impact of recoil, and causing an opening from the rear to the front of the elements of the launcher, ensuring rapid and controlled ejection of its elements by the combined effects of aerodynamic forces and the expansion of the propellant gases.
- the launcher according to the present invention is therefore suitable for ammunition of the type comprising a sub-projectile, in particular a sub-calibrated bullet, and a launcher made of several detachable elements, adapting to the sub-projectile, and it distinguishes in that it comprises, in the immediate vicinity of its rear part, a wall forming, with the surface of the sub-projectile, an inner annular chamber separated from the propellant charge by a deformable or breakable partition.
- the separation of the elements of the launcher does not cause practically any disturbance on the under-calibrated ball, because the elements of the launcher do not bear on the under-calibrated ball.
- the ballistic dispersion of the sub-calibrated bullet is reduced, and the accuracy of the shot is therefore improved.
- the separation or the ejection of the elements of the launcher is controlled and controlled, which improves safety.
- the launcher elements do not interfere with the stabilization of the undersized ball during separation.
- the device according to the present invention is applicable in all ammunition, of small, medium or large caliber, of the type comprising an under-calibrated projectile, for example an under-calibrated bullet, and a launcher made up of at least two detachable elements, in the field of hunting, sporting or war weapons, and preferably in that of hunting weapons.
- This device is inserted in an assembly constituted by a cartridge, which consists of - an primed socket; a charge of propellant powder; a full bullet including a caliber pitcher and an undersized bullet.
- the launcher comprises several detachable elements, and preferably two elements, of cylindrical shape adapting at least in part to the external shape of the sub-cali ⁇ brée ball. When assembled on the undersized bale, these elements are joined together and form a cylinder which is secured to the socket by at least part of its outer surface.
- Each element of the launcher can itself be divided into several sub-elements along the longitudinal axis of the ball.
- the launcher can be produced according to conventional techniques, in metal alloy or in plastic material presenting the required physical properties, for example nylon.
- the sub-calibrated bullet is preferably an arrow bullet of known type, stabilized by empennage, and made of metal or metallic alloy, of mixed metallic organic alloy, or also of reinforced plastic in the case of the drive muni ⁇ tions.
- the inner annular chamber provided in accordance with the invention in the rear part of the launcher is preferably a closed chamber, when the elements are assembled and placed on the sub-calibrated ball.
- the interior annular chamber can be partially open, and include for example an opening directed towards the rear of the ball.
- the interior annular chamber is delimited on its rear part by a deformable or breakable partition which separates it from the charge of propellant powder contained in the socket of the complete bullet. This partition is designed so as to deform or break under the pressure of the propellant gases immediately after igniting the powder. This result can be obtained simply by reducing the thickness of the partition in a determined area, or by an appropriate groove, so as to weaken the partition.
- the internal annular chamber according to the invention can be combined with an external annular chamber of known type, as described for example in patent FR-A-2,606,500, and located immediately near the inner annular chamber, in the rear part of the launcher.
- the gases exert increasing pressure over the entire rear surface of the complete bale, and in particular on the partition separating the inner annular chamber.
- this cloi ⁇ its deforms or breaks according to the boundaries prati ⁇ ced by means of a thickness reduction or a groove, and the propellant gases then enter the inner annular chamber.
- the forces exerted on the sub-calibrated bullet and the launcher are the following the forces of relaxation Pb of the propellant gases trapped in the annular chamber, between the external surface of the bullet sub-calibrated and the launcher, which have the effect of spreading the elements of the launcher from rear to front; the forces related to the aerodynamic pressure Pa exerted on the head of the body of the ball, which tend to open the elements of the launcher from the front;
- the separation of the elements of the launcher is then carried out from the rear towards 1 'before.
- the front part situated at the front of the elements of the launcher is arranged slightly projecting from the head of the sub-calibrated bullet. This results, during the separation of the elements and the sub-calibrated ball, a rocking movement which facilitates the separation of the rear part of the launcher elements, from the rear towards the front.
- the device according to the present invention has many advantages over the known technique.
- the shocks of "separation" of the launcher at the exit of the barrel of the weapon are very weak, because the elements of the launcher do not bear on the sub-calibrated bullet during their movement of separation. This makes it possible to reduce as much as possible the disturbances that the under-calibrated ball could undergo at the start of the trajectory.
- the device of the invention improves the ballistic dispersion of the sub-calibrated ball.
- the tests carried out have shown that this reduction may be approximately 20% compared to a known type of arrow bullet with a launcher such as that described in patent FR-A-2,555,728.
- the control and control of the separation and / or the ejection of the elements of the launcher facilitates the adjustment of the opening cone of these elements by the usual means.
- the tests carried out on balls equipped with the device of the present invention have shown that by varying the forces linked to the aerodynamic pressure Pa, the aerodynamic forces Fa and the forces generated by the expansion of the propellant gases Pb, a variation of the opening cone of the elements of the launcher is obtained between approximately 10 ° and 35 °.
- the device according to the invention makes it possible to use a tailplane with a high span, without causing interference between the elements of the launcher and the stabilizer during the separation of the elements.
- the device of the invention also has the advantage of being compatible with the device with an open external annular chamber described in patent FR-A-2,606,500, and in this case, in addition to the advantages indicated above, also obtains a marked reduction in the recoil shock felt by the shooter, as well as an increase in the initial speed of the bullet, at equal pressure.
- Figure 1 a half-section view of a complete bullet according to the invention, comprising an undersized bullet and a launcher.
- Figure 2 a half-section view showing the position of the launcher in place on the undersized ball.
- Figure 3 a half front view showing the rear part of the launcher in Figure 2.
- Figure 4 a half-view in elevation showing the position of an element of the launcher relative to the sub-calibrated ball, during separation.
- Figure 5 a partial view, in section, of an alternative embodiment of the annular launcher chamber.
- the cartridge (1) shown in FIG. 1, includes a primed socket (2), a charge of propellant powder (3), as well as the complete bullet constituted by the sub-cali ⁇ bred bullet (4), and the launcher ( 5) into two identical elements which are symmetrically disposed relative to the longitudinal axis of the ball, and which can be separated longitudinally.
- the launcher (5) has on its internal face, teeth (6) cooperating with circular grooves (7) formed on the surface of the sub-calibrated ball (4) facilitating the positioning of the launcher and ensuring the mechanical strength of the assembly during the launching phase, in the barrel of the weapon.
- the launcher (5) On its outer surface, the launcher (5) has annular grooves (8) intended to ensure good sealing during the launch phase, by playing the role of decompression grooves. These annular grooves (8) also have the effect of limiting the friction surface in the tube, and allowing the use of heavily choked weapons. As shown more clearly in Figure 2, the launcher has in its rear part an outer groove (9) of triangular section and very elongated, to ensure the flexibility of the part (10) to the passage of the choke of the tube.
- the rear part of the launcher (5) also comprises, at its rear face (11), a partition (12), which delimits, with the internal face of the part (10) and the surface of the ball under calibrated (4), an inner annular chamber (13) of substantially trapezoidal section.
- the partition (12) comprises zones of reduced thickness forming lunules (14) of rounded shape shown in FIG. 3. these lunules, of less resistance than the other parts of the launcher (5), are deformed and broken during the rise in pressure of the propellant gases, which then penetrate into the interior annular chamber (13). The trigger force thus created is exerted on the inner face of the part (10) and tends to push outwardly the entire launcher.
- the front part (15) of the launcher (5) shown in FIG.
- the sub-calibrated bullet (4) consists of a bullet body (19), for example made of lead alloy, and of a tail part (20) which can be made of plastic.
- the body (19) of the sub-calibrated bullet has circular grooves (7), formed perpendicular to the axis of the bullet (4), cooperating with the teeth (6) of the launcher (5).
- the head (21) of the bullet body (19) is of appreciably biconical shape, and is placed slightly behind the central face (18) of the launcher (5).
- the tail part (20) fixed to the rear of the bullet body (19) comprises the tail (22) provided with four wings formed on the tail body (23).
- the latter comprises a cylindrical rib (24) of outside diameter equal to the inside diameter of the partition (12) comprising the lunules (14), so that, when the launcher (5) is placed on the ball under - calibrated (4) in the cartridge, a good seal is ensured between the launcher (5) and the inner wall of the sleeve (2) on the one hand, and between the launcher (5) and the sub-calibrated bullet (4) at the interface between the partition (12) and the cylindrical rib (24) on the other hand.
- An external circular recess (25) in front of the rib (24) in the tail body (23) allows, in this embodiment, to increase the volume of the annular chamber (13).
- the tail body has still a second cylindrical rib (26) having a shoulder (27) cooperating with the first external tooth (28) of the launcher (5).
- the partition (12) having been pushed back by the expansion of the propellant gases, the elements of the launcher (5) separate from the sub-calibrated bullet (4), at the outlet of the barrel of the weapon , in a tilting movement from the rear to the front, under the action of the forces of expansion of the propellant gases Pb in the annular chamber (13) which is greater than the sum of the aerodynamic forces Fa exerted on the part front (15) of the launcher (5) and forces related to the aerodynamic pressure Pa exerted in the cavity formed by the biconical head (21) of the ball (4) and the central face (18) of the launcher (5) .
- the variant embodiment shown in FIG. 5 shows the combination of the interior annular chamber (13) with an exterior annular chamber (29).
- the partition (12) is of low height, and is extended, on the other side of the rear part (10), by a second partition (30) delimiting the outer annular chamber (29).
- This annular chamber (29) is open to the outside. This opening is masked by the wall of the casing before firing, then by the interior wall of the barrel of the weapon in the first phase of launching.
- the partition (30) is broken at the same time as the partition (12) by the rise in pressure of the propellant gases.
- the front part of the elements of the launcher (5) can present a shape different from that shown in Figure (2), depending on the desired effects, according to known techniques.
- the invention has been described with reference to a hunting ball. It applies of course in the same way to all small, medium or large caliber ammunition.
Landscapes
- General Engineering & Computer Science (AREA)
- Engineering & Computer Science (AREA)
- Toys (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Saccharide Compounds (AREA)
- Pinball Game Machines (AREA)
- Continuous Casting (AREA)
- Vending Machines For Individual Products (AREA)
- Manipulator (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Surgical Instruments (AREA)
- Artificial Filaments (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Jib Cranes (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Optical Elements Other Than Lenses (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Manufacturing Of Micro-Capsules (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Eye Examination Apparatus (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Circuits Of Receivers In General (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9309708 | 1993-08-06 | ||
FR9309708A FR2708730B1 (fr) | 1993-08-06 | 1993-08-06 | Lanceur à séparation contrôlée d'éléments pour munitions. |
PCT/FR1994/000984 WO1995004913A1 (fr) | 1993-08-06 | 1994-08-05 | Sabot a separation controlee des segments pour projectiles sous calibres |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0664877A1 true EP0664877A1 (fr) | 1995-08-02 |
EP0664877B1 EP0664877B1 (fr) | 1998-07-08 |
Family
ID=9450005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94924336A Expired - Lifetime EP0664877B1 (fr) | 1993-08-06 | 1994-08-05 | Sabot a separation controlee des segments pour projectiles sous calibres |
Country Status (18)
Country | Link |
---|---|
US (1) | US5589658A (fr) |
EP (1) | EP0664877B1 (fr) |
JP (1) | JPH08503295A (fr) |
KR (1) | KR100331776B1 (fr) |
AT (1) | ATE168186T1 (fr) |
AU (1) | AU681432B2 (fr) |
BR (1) | BR9405544A (fr) |
CA (1) | CA2146443C (fr) |
CZ (1) | CZ290180B6 (fr) |
DE (1) | DE69411529T2 (fr) |
ES (1) | ES2120630T3 (fr) |
FI (1) | FI111296B (fr) |
FR (1) | FR2708730B1 (fr) |
HU (1) | HU217231B (fr) |
NO (1) | NO307232B1 (fr) |
PL (1) | PL174512B1 (fr) |
SK (1) | SK280301B6 (fr) |
WO (1) | WO1995004913A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5668347A (en) * | 1996-09-13 | 1997-09-16 | The United States Of America As Represented By The Secretary Of The Army | Kinetic energy projectile with fin leading edge protection mechanisms |
FR2769700B1 (fr) * | 1997-10-13 | 1999-12-24 | Jean Claude Sauvestre | Lanceur a etancheite amelioree pour munitions du type comportant un lanceur associe a un sous-projectile |
FR2786562B1 (fr) | 1998-11-26 | 2001-02-09 | Jean Noel Letellier | Adaptateur pour balle sous calibree utilisee dans une arme a canon lisse |
US20040045671A1 (en) * | 2002-09-10 | 2004-03-11 | Ed Rejda | Selective etching device |
US6782830B1 (en) * | 2003-09-11 | 2004-08-31 | Alliant Techsystems Inc. | Obturator for large caliber smooth bore ammunition |
FR2867267B1 (fr) * | 2004-03-08 | 2006-05-26 | Jean Claude Sauvestre | Balle de chasse a bague d'expansion |
WO2008097392A2 (fr) | 2006-10-28 | 2008-08-14 | Integrity Ballistic, Llc | Sabot pour projectile élastomère |
US9714819B1 (en) * | 2013-07-15 | 2017-07-25 | The Boeing Company | Stepped sabots for projectiles |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3905299A (en) * | 1972-08-08 | 1975-09-16 | Pacific Technica Corp | Discarding sabot projectiles |
US5182419A (en) * | 1978-05-26 | 1993-01-26 | Asi Systems International | Saboted projectile |
FR2521717B1 (fr) * | 1982-02-16 | 1986-11-21 | France Etat | Projectile a energie cinetique et procede de lancement de celui-ci |
FR2555728B1 (fr) * | 1983-11-29 | 1987-03-20 | Sauvestre Jean Claude | Munition pour arme de chasse |
FR2599828B1 (fr) * | 1986-06-05 | 1990-08-24 | Sauvestre Jean Claude | Munition de petit ou moyen calibre a efficacite amelioree et portee limitee, en particulier pour la chasse |
FR2606500B1 (fr) * | 1986-06-05 | 1990-07-06 | Sauvestre Jean Claude | Munition de chasse a volume de combustion augmente |
US4802415A (en) * | 1987-12-28 | 1989-02-07 | Ford Aerospace Corporation | Telescoped ammunition round having subcaliber projectile sabot with integral piston |
-
1993
- 1993-08-06 FR FR9309708A patent/FR2708730B1/fr not_active Expired - Fee Related
-
1994
- 1994-08-05 EP EP94924336A patent/EP0664877B1/fr not_active Expired - Lifetime
- 1994-08-05 KR KR1019950701314A patent/KR100331776B1/ko not_active IP Right Cessation
- 1994-08-05 WO PCT/FR1994/000984 patent/WO1995004913A1/fr active IP Right Grant
- 1994-08-05 JP JP7506254A patent/JPH08503295A/ja active Pending
- 1994-08-05 AT AT94924336T patent/ATE168186T1/de active
- 1994-08-05 PL PL94308299A patent/PL174512B1/pl unknown
- 1994-08-05 DE DE69411529T patent/DE69411529T2/de not_active Expired - Lifetime
- 1994-08-05 US US08/411,661 patent/US5589658A/en not_active Expired - Lifetime
- 1994-08-05 BR BR9405544-0A patent/BR9405544A/pt active IP Right Grant
- 1994-08-05 AU AU74638/94A patent/AU681432B2/en not_active Ceased
- 1994-08-05 SK SK442-95A patent/SK280301B6/sk not_active IP Right Cessation
- 1994-08-05 CA CA002146443A patent/CA2146443C/fr not_active Expired - Lifetime
- 1994-08-05 ES ES94924336T patent/ES2120630T3/es not_active Expired - Lifetime
- 1994-08-05 CZ CZ1995862A patent/CZ290180B6/cs not_active IP Right Cessation
- 1994-08-05 HU HU9500998A patent/HU217231B/hu unknown
-
1995
- 1995-04-05 NO NO951331A patent/NO307232B1/no not_active IP Right Cessation
- 1995-04-05 FI FI951626A patent/FI111296B/fi active
Non-Patent Citations (1)
Title |
---|
See references of WO9504913A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR950703725A (ko) | 1995-09-20 |
SK44295A3 (en) | 1995-09-13 |
FI111296B (fi) | 2003-06-30 |
NO307232B1 (no) | 2000-02-28 |
FR2708730A1 (fr) | 1995-02-10 |
CA2146443C (fr) | 2005-06-14 |
US5589658A (en) | 1996-12-31 |
BR9405544A (pt) | 1999-09-08 |
PL174512B1 (pl) | 1998-08-31 |
ATE168186T1 (de) | 1998-07-15 |
HU9500998D0 (en) | 1995-06-28 |
FR2708730B1 (fr) | 1995-10-20 |
SK280301B6 (sk) | 1999-11-08 |
DE69411529T2 (de) | 1999-02-18 |
CZ290180B6 (cs) | 2002-06-12 |
AU7463894A (en) | 1995-02-28 |
HUT72879A (en) | 1996-05-28 |
FI951626A0 (fi) | 1995-04-05 |
CZ86295A3 (en) | 1995-10-18 |
HU217231B (hu) | 1999-12-28 |
WO1995004913A1 (fr) | 1995-02-16 |
JPH08503295A (ja) | 1996-04-09 |
NO951331L (no) | 1995-04-05 |
FI951626A (fi) | 1995-04-05 |
ES2120630T3 (es) | 1998-11-01 |
AU681432B2 (en) | 1997-08-28 |
CA2146443A1 (fr) | 1995-02-16 |
KR100331776B1 (ko) | 2002-11-30 |
EP0664877B1 (fr) | 1998-07-08 |
PL308299A1 (en) | 1995-07-24 |
DE69411529D1 (de) | 1998-08-13 |
NO951331D0 (no) | 1995-04-05 |
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