Method for manufacturing banded projectiles intended for firing from rifled barrels and projectiles made according to the method, and method for utilizing their special characteristics imparted by the method for manufacture when firing these projectiles

Abstract

In its simplest form the present invention comprises a new method for manufacturing projectiles ( 1, 11 - 12 and 19 ) provided with bands ( 4, 9, 16 ), whilst according to a further development of the invention, the facility is afforded for manufacturing artillery projectiles ( 1, 11 - 12 ) according to the same basic principle, which can alternatively be launched from a rifled barrel with or without any spin, along with the facility, according to a new method, for launching spin-free projectiles ( 6 ) from rifled barrels without the use of so-called slipping plastic bands.

1 . Method for manufacturing projectiles provided with bands and intended for firing from rifled barrels, characterized in that the basically annular bands of the projectiles are joined to the projectile body by way of an internal thread and a corresponding external thread applied along the outside of said body. 
   
   
       2 . Method according to  claim 1 , characterized in that when the projectile is intended to be fired spin-stabilized, the band, after threading onto the projectile body but before firing, is fixed in relation to the projectile body in a rear stop position in the launch direction of the projectile. 
   
   
       3 . Method according to  claim 1 , characterized in that when launching one and the same type of banded projectile from a rifled barrel, a choice is offered between an entirely spin-free launch of said projectile and a spinning launch of the projectile consistent with the barrel rifling, the bands of the projectiles being provided with an internal thread that is threaded onto a corresponding external thread on the projectile body, the band, for a spin-free launch, being fitted as far forward as possible in the launch direction of the projectile onto the external thread on the projectile body, this external thread, which is formed with the same handed thread as the barrel rifling and with at least the same number of thread turns as the barrel rifling, forcing the band to spin as it is projected through the barrel, and the scope for the band to spin being prevented prior to launching, when a fully spinning launch of the projectile is required. 
   
   
       4 . Method according to  claim 1 , characterized in that when a fully spinning launch of the fired projectile is required, the scope for the band to spin is prevented in that the band, before firing of the projectile, is screwed rearwards in the intended launch direction of the projectile along the external thread on the projectile body to a stop position, which ensures that the spin which the barrel rifling imparts to the band is fully transmitted to the projectile body. 
   
   
       5 . Method according to  claim 1  in spin-free firing of projectiles that are launched with the aid of banded discarding sabots for ensuring that each discarding sabot is fully freed from its respective band when the discarding sabots leave the barrel, characterized in that the discarding sabots are provided with external threads on which respective bands provided with internal threads are screwed to the foremost position of the respective external thread in the intended launch direction of the projectile, these threads being formed with a number of thread turns somewhat fewer than the number of turns included in the barrel rifling. 
   
   
       6 . Method according to  claim 1 , for manufacturing banded, full-calibre projectiles intended to be capable of firing from rifled barrels either entirely free of spin or with the spin generated by the rifling of the barrel used for launching, characterized in that the projectile is manufactured in the form of two projectile parts that can be screwed together, of which the one projectile part has an joining part which is provided with and external thread and which is designed to be inserted into a matching cavity in the second projectile part provided with a corresponding internal thread, one or other of the projectile parts having a reduction-turned threaded section adjacent to the joint between them for screwing on the internally threaded band, onto which section the band is threaded before the projectile parts are screwed together. 
   
   
       7 . Banded projectile intended to embody the method according to  claim 1 , characterized in that the band is joined to the projectile by means of its own internal thread and a corresponding external thread arranged along the outside of the projectile, said threads interacting with one another. 
   
   
       8 . Banded projectiles intended to embody the method according to  claim 1 , which projectiles can be fired entirely without spin, or alternatively under the spin imparted by the barrel rifling, characterized in that each projectile comprises an external thread onto which is screwed an intrinsically annular band, which inherently comprises a corresponding internal thread, both of these threads having the same handed thread as the barrel rifling and the external thread of the projectile having a thread pitch and thread length that is chosen to allow the matching band provided with an internal thread to be displaced from a forward position in the launch direction of the projectile to a rearward position in the launch direction of the projectile, and that this movement covers at least the same number of thread turns as the number of turns in the barrel rifling over the entire length of the barrel. 
   
   
       9 . Banded projectile intended to embody the method according to  claim 1 , and intended to be fired from a rifled barrel, which it must leave entirely free of spin, characterized in that the projectile consists of a sub-calibre, armour-piercing, hard-core projectile fin-stabilized on its trajectory to the target, which is fired from the barrel in question with the aid of a discarding sabot, which in turn has an external thread, onto which the band having an internal thread engaging therein is screwed, the thread of the discarding sabot being of a length designed to ensure that the band leaves the discarding sabot as the projectile leaves the barrel. 
   
   
       10 . Banded projectile according to  claim 9 , characterized in that its band is provided with fracture lines which ensure that the band is broken up into multiple parts when it has been threaded by the discarding sabot and thereby leaves the latter. 
   
   
       11 . Method according to  claim 2 , characterized in that when launching one and the same type of banded projectile from a rifled barrel, a choice is offered between an entirely spin-free launch of said projectile and a spinning launch of the projectile consistent with the barrel rifling, the bands of the projectiles being provided with an internal thread that is threaded onto a corresponding external thread on the projectile body, the band, for a spin-free launch, being fitted as far forward as possible in the launch direction of the projectile onto the external thread on the projectile body, this external thread, which is formed with the same handed thread as the barrel rifling and with at least the same number of thread turns as the barrel rifling, forcing the band to spin as it is projected through the barrel, and the scope for the band to spin being prevented prior to launching, when a fully spinning launch of the projectile is required. 
   
   
       12 . Method according to  claim 2 , characterized in that when a fully spinning launch of the fired projectile is required, the scope for the band to spin is prevented in that the band, before firing of the projectile, is screwed rearwards in the intended launch direction of the projectile along the external thread on the projectile body to a stop position, which ensures that the spin which the barrel rifling imparts to the band is fully transmitted to the projectile body. 
   
   
       13 . Method according to  claim 3 , characterized in that when a fully spinning launch of the fired projectile is required, the scope for the band to spin is prevented in that the band, before firing of the projectile, is screwed rearwards in the intended launch direction of the projectile along the external thread on the projectile body to a stop position, which ensures that the spin which the barrel rifling imparts to the band is fully transmitted to the projectile body. 
   
   
       14 . Method according to  claim 2 , for manufacturing banded, full-calibre projectiles intended to be capable of firing from rifled barrels either entirely free of spin or with the spin generated by the rifling of the barrel used for launching, characterized in that the projectile is manufactured in the form of two projectile parts that can be screwed together, of which the one projectile part has an joining part which is provided with and external thread and which is designed to be inserted into a matching cavity in the second projectile part provided with a corresponding internal thread, one or other of the projectile parts having a reduction-turned threaded section adjacent to the joint between them for screwing on the internally threaded band, onto which section the band is threaded before the projectile parts are screwed together. 
   
   
       15 . Method according to  claim 3 , for manufacturing banded, full-calibre projectiles intended to be capable of firing from rifled barrels either entirely free of spin or with the spin generated by the rifling of the barrel used for launching, characterized in that the projectile is manufactured in the form of two projectile parts that can be screwed together, of which the one projectile part has an joining part which is provided with and external thread and which is designed to be inserted into a matching cavity in the second projectile part provided with a corresponding internal thread, one or other of the projectile parts having a reduction-turned threaded section adjacent to the joint between them for screwing on the internally threaded band, onto which section the band is threaded before the projectile parts are screwed together. 
   
   
       16 . Method according to  claim 4 , for manufacturing banded, full-calibre projectiles intended to be capable of firing from rifled barrels either entirely free of spin or with the spin generated by the rifling of the barrel used for launching, characterized in that the projectile is manufactured in the form of two projectile parts that can be screwed together, of which the one projectile part has an joining part which is provided with and external thread and which is designed to be inserted into a matching cavity in the second projectile part provided with a corresponding internal thread, one or other of the projectile parts having a reduction-turned threaded section adjacent to the joint between them for screwing on the internally threaded band, onto which section the band is threaded before the projectile parts are screwed together. 
   
   
       17 . Banded projectile intended to embody the method according to  claim 2 , characterized in that the band is joined to the projectile by means of its own internal thread and a corresponding external thread arranged along the outside of the projectile, said threads interacting with one another. 
   
   
       18 . Banded projectile intended to embody the method according to  claim 3 , characterized in that the band is joined to the projectile by means of its own internal thread and a corresponding external thread arranged along the outside of the projectile, said threads interacting with one another. 
   
   
       19 . Banded projectile intended to embody the method according to  claim 4 , characterized in that the band is joined to the projectile by means of its own internal thread and a corresponding external thread arranged along the outside of the projectile, said threads interacting with one another. 
   
   
       20 . Banded projectile intended to embody the method according to  claim 5 , characterized in that the band is joined to the projectile by means of its own internal thread and a corresponding external thread arranged along the outside of the projectile, said threads interacting with one another.