EP0238155A1 - Munition pour armes à feu - Google Patents

Munition pour armes à feu Download PDF

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Publication number
EP0238155A1
EP0238155A1 EP87300039A EP87300039A EP0238155A1 EP 0238155 A1 EP0238155 A1 EP 0238155A1 EP 87300039 A EP87300039 A EP 87300039A EP 87300039 A EP87300039 A EP 87300039A EP 0238155 A1 EP0238155 A1 EP 0238155A1
Authority
EP
European Patent Office
Prior art keywords
bullet
rings
case
cavity
ring
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.)
Withdrawn
Application number
EP87300039A
Other languages
German (de)
English (en)
Inventor
Carlos Roberto Emilio Lamm
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0238155A1 publication Critical patent/EP0238155A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F42B30/02—Bullets
    • 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
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F42B5/067—Mounting or locking missiles in cartridge cases

Definitions

  • This invention relates to ammunitions for firearms such as handguns and more particularly for automatic pistols where the volumetric capacity of the ammunition case is predetermined in relationship to the structure, resistance and configuration of the pistol, and where the length of the case-bullet structure as well as the peripheral bullet shape cannot be changed.
  • the kinetic energy of such an ammunition is considerably increased by decreasing the friction generated between the surface of the bullet and the inner surface of the barrel and by allowing the internal case volume to increase in a particular manner to allow a much larger propellent load.
  • the invention provides for the manufacture of very light weight bullets, having standard dimensions and being made of relatively hard materials, such as mild steel, compared to lead jacketed bullets.
  • Deformable bullets which expand upon impacting the target have a high stopping power, and do not overpenetrate the human body, but their metal piercing capacity is very low and their target range is excessive for police use. These bullets may not be employed by military forces, because of international conventions, that forbides the use of deformable bullets.
  • a relatively recent development consists in the use of very light weight bullets made of brass or copper.
  • the kinetic energy of a fired bullet is roughly proportional to the cartridges propellent powder load, so the lighter the bullet, the higher the speed.
  • a high starting force has the same effect on pressure as increasing the bullet weight.
  • a 9 mm Luger plain brass bullet will have a maximum pressure 3% higher than a conventional metal jacketed one.
  • a steel one, hard enough to get stuck on the rifling would increase pressure to the extent of blowing the barrel.
  • the present invention provides an ammunition for firearms wherein the bullet, after having left its case exposes a reduced bullet friction surface because of two narrow rings on the said bullet.
  • the bullet upon firing, while first being clamped in the case, is capable of sliding freely along the case before one of said rings engages a front canelure or ring-recess of the case, increasing thus the case volume, which in turn reduces the maximum pressure peak on the barrel. Since for a given powder load, the maximum pressure becomes reduced, it is possible to increase the propellent charge and therefore the kinetic energy, without exceeding the allowed maximum pressure value.
  • the bullet according to the invention has a large cavity opened at the bullet's base, to reduce its weight and to allow for an increased propellent powder load.
  • the starting forces are proportional to the surface which is to be deformed by the helical rifling of the barrel of the guns, the obvious solution, to reduce the starting forces is to reduce the surface to be deformed.
  • the bullets body diameter is reduced to the inner rifling diameter and the two narrow rings -a first or rear ring at the bullets base and a second or front ring at a sufficient distance from the first one- have an outer diameter equal to the inner diameter of the barrel's bore diameter and will be the only part of the bullet to be deformed by the rifling thereof.
  • a bullet requires upon firing, a certain force to pull out of the case. This required force allows the pressure to build up before the bullet starts moving allowing the propellent powder to ignite completely. If the required force is low, part of the ignition takes place after the bullet has pulled out becoming irregular, not reaching the correct peak value and so delivering lower and irregular combustion values.
  • the present invention provides a way to control the bullet pull out force of the casing and thereby achieving a better powder ignition. The force necessary to move the bullet along the case will depend on the friction which becomes generated between the bullets surface and the case.
  • a bullet merely having two spaced apart narrow rings, will have a low friction force on the case, and two new problems will arise: 1) The bullet may be accidentally pushed into the case, thereby increasing the maximum pressure, when fired. 2) The required pull out force will be too low, thereby producing an unsatisfactory combustion.
  • the conventional solution is a canelure formed just below the bullets base. To increase the required pull out force, another canelure is formed in front of the rear ring.
  • a better solution which is part of this invention is a single canelure formed below the second or front ring.
  • This canelure will prevent the bullet to be accidentally pushed into the case.
  • the bullet will move forward by a minimum pressure until said first or rear ring engages the canelure.
  • the bullet will be stopped until sufficient pressure builds up to pull out the bullet by deforming the canelure.
  • This first movement of the bullet within the case has the same effect on the maximum pressure aspect as if the case were longer for a same propellent powder load since the maximum pressure drops as the case volume increases. This pressure drop allows to increase the propellent powder load and conse­ quently enables to achieve a higher kinetic energy and therefore a higher speed of the bullet.
  • the bullets movement within the case will be about 2,5 mm, increasing the case volume by 20% and reducing pressure by 15%.
  • the movement within the case will be 5 mm, increasing the case volume by 49% and reducing presure by 30%.
  • Another aspect of this invention is the possibility of manufacturing bullets having thin wall portions at the zone of the hollow base, allowing the use of outstanding cavities.
  • This invention provides a communication between the space defined between the rings and the cavity of the bullet, so that the pressure will be the same on both sides of the above referred to wall portions, whereby no wall deformation takes place.
  • This communication may be achieved for instance by holes in the cavity wall, pertinent slots cut into the rear ring or making the rear ring of a smaller diameter than the bore of the case.
  • the present invention avoids the risk of the bullet blowing up when leaving the barrel. If holes are utilized which allows the gases to escape when the thin wall portions alone are still supported within the barrel.
  • the present invention provides an ammunition for firearms comprising a case adapted for containing a propellent powder load and a bullet partially inserted within the case, the bullet being of the kind which has a rear part and a front part, a hollow base forming a cavity opened to the rear part of the bullet, the cavity is formed by wall portions which are relatively thin regarding the remaining body of the bullet, the improvement wherein said bullet includes, at the zone of said cavity, two spaced apart rings projecting from the outer surface of the bullet, there being a first of the rings which is located at the rear part of the bullet and a second of the rings located spaced apart from the first ring and towards the front part of the bullet, at least said second ring being in sealing contact with the case, a space which is formed between the outer surface of the bullet located between both first and second rings and the case is, at least when firing the ammunition, communicated with said cavity and the interior of said case where the propellent powder load is located.
  • an ammunition for firearms comprising a case having a case wall and adapted for containing a propellent powder load and a bullet partially inserted within the case, the bullet being of the kind which has a rear part and a front part, a hollow base forming a cavity opened to the rear part of the bullet, the cavity is formed by wall portions which are relatively thin regarding the remaining body of the bullet, the improvement wherein said bullet includes, at the zone of said cavity, two spaced apart rings projecting from the outer surface of the bullet, there being a first of the rings which is located at the rear part of the bullet and a second of the rings is located spaced apart from the first ring and towards the front part of the bullet, at least said second ring being in sealing contact with the case, and the case having bullet retaining means adapted to retain the bullet in position within the case, the bullet retaining means comprising a canelure radially inwardly projecting from the case wall and which extends between both rings of the bullet, the inner diameter of the canelure being
  • the invention provides an ammunition for firearms comprising a case having a case wall and adapted for containing a propellent powder load and a bullet partially inserted within the case, the bullet being of the kind which has a rear part and a front part, a hollow base forming a cavity opened to the rear part of the bullet, the cavity is formed by wall portions which are relatively thin regarding the remaining body of the bullet, the improvement wherein said bullet includes, at the zone of said cavity, two spaced apart rings projecting from the outer surface of the bullet, there being a first of the rings which is located at the rear part of the bullet and a second of the rings located spaced apart from the first ring and towards the front part of the bullet, said second ring being in sealing contact with the case, and the case having bullet retaining means adapted to retain the bullet in position within the case, the bullet retaining means comprising a canelure radially inwardly projecting from the case wall and which extends between both rings of the bullet, the inner diameter of the canelure being smaller than the outer diameter
  • the invention provides a bullet for an ammunition having a rear part with an open cavity, and a front part, the cavity is formed by wall portions which are relatively thin regarding the remaining body of the bullet, the improvement wherein said bullet includes, at the zone of said cavity, two spaced apart rings projecting from the outer surface of the bullet, there being a first of the rings which is located at the rear part of the bullet and a second of the rings located spaced apart from the first ring and towards the front part of the bullet, the thin wall includes, between both rings, at least one through orifice.
  • the invention provides a bullet for an ammunition having a rear part with an open cavity, and a front part, the cavity is formed by wall portions which are relatively thin regarding the remaining body of the bullet, the improvement wherein said bullet includes, at the zone of said cavity, two spaced apart rings projecting from the outer surface of the bullet, there being a first of the rings which is located at the rear part of the bullet and a second of the rings located spaced apart from the first ring and towards the front part of the bullet, the first ring having an outer diameter smaller than the outer diameter of said second ring.
  • the invention provides a bullet for an ammunition having a rear part with an open cavity, and a front part, the cavity is formed by wall portions which are relatively thin regarding the remaining body of the bullet, the improvement wherein said bullet includes, at the zone of said cavity, two spaced apart rings projecting from the outer surface of the bullet, there being a first of the rings which is located at the rear part of the bullet and a second of the rings located spaced apart from the first ring and towards the front part of the bullet, the first ring having at least a groove connecting the opposite sides of the ring.
  • the surface to be deformed by the rifling of the barrel of the fire arm is the one located between the schematically indicated plans a and b defining the body portion c .
  • the diameter of the body portion c was reduced, so as to have substantially the same inner diameter of the rifling, as indicated by reference numeral 1 ⁇ in Figure 2.
  • Two narrow rings having a diameter corresponding to the gun bore diameter are formed on the bullet 1, more particularly a first or rear ring 2 at the bullet's base and a second or front ring 3 at a suitable distance to allow a correct assembling with a case. Both rings 2 and 3 will provide a guidance for the bullet after having left the case 13, and the front one 3 will provide the seal in the barrel (not shown) of the gun.
  • This bullet 1 having only two narrow rings 2, 3 in contact with the wall of the well known cylindrical case (not shown) will provide for a very low pull out force.
  • a canelure 4 is formed in the case 14, adjacent the rear ring 2, as shown in Figure 4.
  • another canelure 5 can be formed at the other side of rear ring 2, opposite the canelure 4.
  • the ammunition comprises a case 13 and a bullet 15 partially fit therein.
  • Bullet 15 comprises a front part and a rear part.
  • a single canelure 6 is formed in case 13, adjacent the front ring 3. This single canelure 6 will prevent the bullet 15 to accidentally be pushed into the case 13 and when the ammunition is fired, the bullet 15 will first move forward with a minimum pressure, about 20 bar, until the rear ring 2 located at the rear part engages the front canelure 6 as shown in Figure 6. The bullet 15 will then be retained until pressure builds up to about 120 bar pulling out the bullet 15 by overcoming the resistance offered by the canelure 6.
  • cavity 7 ( Figures 3 and 6) has to be connected to the space defined between outer surface 10 of wall portion 9, and case 13 so that the pressure will be the same inside and outside cavity 7.
  • Such a pressure compensation will avoid outward radial deformation of thin wall portion 9 and therefore will avoid a frictional contact thereof with the barrel.
  • Still another manner of performing such a communication is to provide a rear ring (not shown) having a smaller diameter than the inner diameter of case 13 and the gun barrel bore (not shown) so that the rear ring will not seal against the inner surface of the gun barrel.
  • This embodiment may be readily understood by anybody skilled in the art, without specific illustration.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
EP87300039A 1986-01-06 1987-01-06 Munition pour armes à feu Withdrawn EP0238155A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AR30279486 1986-01-06

Publications (1)

Publication Number Publication Date
EP0238155A1 true EP0238155A1 (fr) 1987-09-23

Family

ID=3478365

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87300039A Withdrawn EP0238155A1 (fr) 1986-01-06 1987-01-06 Munition pour armes à feu

Country Status (1)

Country Link
EP (1) EP0238155A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2801784A1 (fr) * 2004-04-02 2014-11-12 Techventure Investments Pty Ltd Projectile
JP2015169408A (ja) * 2014-03-10 2015-09-28 旭精機工業株式会社 弾丸及び弾薬
KR20160057389A (ko) * 2013-07-31 2016-05-23 테크벤쳐 인베스트먼트스 피티와이 엘티디 소형 화기 또는 경화기용 발사체 몸체 및 그에 부합하는 탄환
CN105674810A (zh) * 2016-02-05 2016-06-15 田悦丰 一种二次杀伤箭装置
JP2020521939A (ja) * 2017-05-30 2020-07-27 テクベンチャー インベストメンツ プロプライエタリー リミテッドＴｅｃｈｖｅｎｔｕｒｅ Ｉｎｖｅｓｔｍｅｎｔｓ Ｐｔｙ Ｌｔｄ 単一シール発射体

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3232825A1 (de) * 1981-09-24 1983-03-31 Robert 58640 Varennes Vauzelles Antoine Geschoss fuer handfeuerwaffen und gewehre sowie mit einem solchen geschoss versehene patrone

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3232825A1 (de) * 1981-09-24 1983-03-31 Robert 58640 Varennes Vauzelles Antoine Geschoss fuer handfeuerwaffen und gewehre sowie mit einem solchen geschoss versehene patrone

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2801784A1 (fr) * 2004-04-02 2014-11-12 Techventure Investments Pty Ltd Projectile
KR20160057389A (ko) * 2013-07-31 2016-05-23 테크벤쳐 인베스트먼트스 피티와이 엘티디 소형 화기 또는 경화기용 발사체 몸체 및 그에 부합하는 탄환
EP3028001A4 (fr) * 2013-07-31 2016-07-20 Techventure Investments Pty Ltd Corps de projectile et cartouche de munitions correspondante pour armes de petit calibre ou arme à feu légère
JP2016528464A (ja) * 2013-07-31 2016-09-15 テクベンチャー インベストメンツ プロプライエタリー リミテッドＴｅｃｈｖｅｎｔｕｒｅ Ｉｎｖｅｓｔｍｅｎｔｓ Ｐｔｙ Ｌｔｄ 発射体本体及びそれを伴う小火器用又は軽火器用弾丸
USRE47187E1 (en) 2013-07-31 2019-01-01 Techventure Investments Pty Ltd Projectile body and corresponding ammunition round for small arms or a light firearm
JP2015169408A (ja) * 2014-03-10 2015-09-28 旭精機工業株式会社 弾丸及び弾薬
CN105674810A (zh) * 2016-02-05 2016-06-15 田悦丰 一种二次杀伤箭装置
JP2020521939A (ja) * 2017-05-30 2020-07-27 テクベンチャー インベストメンツ プロプライエタリー リミテッドＴｅｃｈｖｅｎｔｕｒｅ Ｉｎｖｅｓｔｍｅｎｔｓ Ｐｔｙ Ｌｔｄ 単一シール発射体

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