WO2020016731A1 - Dispositif de pression à orifice variable destiné à être utilisé sur un lanceur de grenade multiple - Google Patents

Dispositif de pression à orifice variable destiné à être utilisé sur un lanceur de grenade multiple Download PDF

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Publication number
WO2020016731A1
WO2020016731A1 PCT/IB2019/056002 IB2019056002W WO2020016731A1 WO 2020016731 A1 WO2020016731 A1 WO 2020016731A1 IB 2019056002 W IB2019056002 W IB 2019056002W WO 2020016731 A1 WO2020016731 A1 WO 2020016731A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
wall surface
cylinder
housing
groove
Prior art date
Application number
PCT/IB2019/056002
Other languages
English (en)
Inventor
Christo Botes
Original Assignee
Rippel Effect Systems (Pty) Limited
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 Rippel Effect Systems (Pty) Limited filed Critical Rippel Effect Systems (Pty) Limited
Publication of WO2020016731A1 publication Critical patent/WO2020016731A1/fr
Priority to ZA2021/00366A priority Critical patent/ZA202100366B/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41C—SMALLARMS, e.g. PISTOLS, RIFLES; ACCESSORIES THEREFOR
    • F41C27/00—Accessories; Details or attachments not otherwise provided for
    • F41C27/06—Adaptations of smallarms for firing grenades, e.g. rifle grenades, or for firing riot-control ammunition; Barrel attachments therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B11/00—Compressed-gas guns, e.g. air guns; Steam guns
    • F41B11/70—Details not provided for in F41B11/50 or F41B11/60
    • F41B11/73—Sealing arrangements; Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B11/00—Compressed-gas guns, e.g. air guns; Steam guns
    • F41B11/80—Compressed-gas guns, e.g. air guns; Steam guns specially adapted for particular purposes

Definitions

  • the invention relates to a variable port pressure device, also referred to as a gas plug or pressure piston, adapted for use on a multiple grenade launcher, and configured to improve indexing of such a weapon, particularly when used with lower velocity ammunition.
  • a variable port pressure device also referred to as a gas plug or pressure piston
  • a grenade launcher is a weapon that fires a specially-designed large-calibre projectile, often with an explosive, smoke or gas, anti-riot baton, irritant or pyrotechnic warhead.
  • the term typically refers to a class of dedicated firearms firing unitary grenade cartridges, of which the most common type are man-portable, shoulder-fired weapons used by individuals.
  • a grenade launcher is suitable for anti-riot and other non-lethal security operations, allowing it to fire less lethal rounds at much lower pressures and velocities.
  • a Multiple Grenade Launcher (abbreviated as“MGL”) is generally a lightweight, low- velocity, shoulder-fired 40mm weapon, although variations also fire 37mm or 38mm cartridges.
  • the MGL includes a lightweight, progressively rifled steel barrel, sight assembly, frame with firing mechanism and a folding stock. It also includes a spring- actuated, usually six-round, revolver-style cylinder which rotates automatically while firing, as well as a pressure piston which is located adjacent and operatively associated with the cylinder for locking the cylinder in place each time a new round is fired.
  • the MGL is loaded by releasing a cylinder axis pin and swinging the frame away from the cylinder.
  • the rear of the cylinder (including a pistol grip) is unlatched and pivoted counter-clockwise against its driving spring to expose the cylinder chambers during reloading. Grenades are then inserted into the cylinder chambers, the frame closed, and the axis pin re-engaged to lock the cylinder into position.
  • a trigger When a trigger is pressed, a double-action takes place and a firing pin is cocked and released to fire a grenade. Gas pressure on the pressure piston displaces the piston such that it becomes disengaged from the cylinder, thereby unlocking the cylinder and allowing the spring to rotate the cylinder until the next chamber is aligned with the firing pin, whereupon the piston re-engages the cylinder and the next round can be fired.
  • a 40mm grenade typically includes a projectile and fuse contained within a 40mm cartridge casing.
  • the cartridge casing includes a heavy cup-shaped high-pressure chamber.
  • a propellant builds up pressure within the high-pressure chamber until it releases the projectile down the barrel.
  • the resultant gas pressure also displaces the pressure piston so as to unlock the cylinder and allow it to rotate to the next round.
  • firing of the cartridge releases sufficient gas pressure effectively to displace the pressure piston, allowing for effortless rotation of the cylinder.
  • non-lethal / less-lethal cartridges such as baton rounds (rubber or plastic bullets), beanbag, rubber buckshot (stinger) or pepper ball rounds, are larger than lethal lead-carrying cartridges and they are fired at lower pressures and velocities.
  • the applicant has identified a need to decrease gas leakage so as to increase gas pressure being exerted on the pressure piston during the firing of particularly non-lethal / less-lethal cartridges, so as to ensure continuous indexing of the cylinder after each successive shot fired.
  • variable port pressure device suitable for, although not limited to, use in a Multiple Grenade Launcher which includes a rotating cylinder, the device including - a piston housing arranged approximate the cylinder;
  • a complimentarily configured pressure-actuated piston which is displaceable within the piston housing between a first position, in which it is operatively engaged with the cylinder, and a second position in which it is operatively disengaged from the cylinder;
  • the device being characterised therein that it includes at least one groove extending about an exterior wall surface of the piston and/or an interior wall surface of the piston housing so as to create a tortuous gas flow path between the exterior wall surface of the piston and the interior wall surface of the piston housing for decreasing gas leakage during a firing process.
  • the pressure-actuated piston may longitudinally axially be displaceable within the piston housing between the first and second positions and the piston may include at least one groove which at least partially circumferentially extends about the exterior wall surface of the piston.
  • the piston may include at least one continuous groove extending circumferentially about a lower portion of the piston, the groove being bordered by two groove threads, with a small clearance existing between tips of the groove threads and the interior wall surface of the piston housing.
  • the piston may include two or more circumferentially extending grooves arranged in longitudinal axial displacement about the exterior wall surface of the piston so as to create a labyrinth type of seal between the piston and the piston housing, the arrangement being such that gas released by the firing process becomes entrapped within a labyrinth groove, thereby decreasing gas leakage, increasing effective displacement of the piston between the first and second positions, and increasing indexing of the weapon after each successive shot.
  • the device may include at least one groove which at least partially circumferentially extends about the interior wall surface of the piston housing.
  • the piston housing may include at least one continuous groove extending circumferentially about a lower portion of the piston housing, the groove being bordered by two groove threads, with a small clearance existing between tips of the groove threads and the exterior wall surface of the piston.
  • the piston housing may include two or more circumferentially extending grooves arranged in longitudinal axial displacement about the interior wall surface of the piston housing so as to create a labyrinth type of seal between the piston housing and the piston.
  • the device further may be characterised therein that the piston comprises a substantially hollow cylindrical body.
  • the hollow cylindrical body may terminate at opposing ends thereof in a base wall and top wall respectively for sealing the hollow interior of the piston body to prevent ingress of dirt or other elements into the piston body.
  • the device further may be characterised therein that the piston terminates at one end thereof in a substantially concave base wall, so as to increase pressure surface area at a pressure actuated end of the piston.
  • variable port pressure device suitable for, although not limited to, use in a Multiple Grenade Launcher which includes a rotating cylinder, the device including - a piston housing arranged approximate the cylinder;
  • the piston comprises a substantially hollow cylindrical body terminating at opposing ends thereof in a base wall and top wall respectively for sealing a hollow interior of the piston body.
  • the device further may be characterised therein that the piston terminates at one end thereof in a substantially concave base wall, so as to increase pressure surface area at a pressure actuated end of the piston.
  • the device also may include at least one groove extending about an exterior wall surface of the piston and/or an interior wall surface of the piston housing so as to create a tortuous gas flow path between the exterior wall surface of the piston and the interior wall surface of the piston housing for decreasing gas leakage during a firing process.
  • a variable port pressure device suitable for, although not limited to, use in a Multiple Grenade Launcher which includes a rotating cylinder, the device including - a piston housing arranged approximate the cylinder;
  • a complimentarily configured pressure-actuated piston which is displaceable within the piston housing between a first position, in which it is operatively engaged with the cylinder, and a second position in which it is operatively disengaged from the cylinder;
  • the device being characterised therein that the piston terminates at one thereof in a substantially concave base wall, so as to increase pressure surface area at a pressure actuated end of the piston.
  • the device further may be characterised therein that the piston comprises a substantially hollow cylindrical body.
  • the hollow cylindrical body may terminate at opposing ends thereof in a base wall and top wall respectively for sealing the hollow interior of the piston body to prevent ingress of dirt or other elements into the piston body.
  • the device also may include at least one groove extending about an exterior wall surface of the piston and/or an interior wall surface of the piston housing so as to create a tortuous gas flow path between the exterior wall surface of the piston and the interior wall surface of the piston housing for decreasing gas leakage during a firing process.
  • variable port pressure device suitable for, although not limited to, use in a Multiple Grenade Launcher which includes a rotating cylinder, the device including - a piston housing arranged approximate the cylinder;
  • a complimentarily configured pressure-actuated piston which is displaceable within the piston housing between a first position, in which it is operatively engaged with the cylinder, and a second position in which it is operatively disengaged from the cylinder;
  • the device being characterised therein that it includes at least one groove extending about an exterior wall surface of the piston and/or an interior wall surface of the piston housing so as to create a tortuous gas flow path between the exterior wall surface of the piston and the interior wall surface of the piston housing for decreasing gas leakage during a firing process;
  • the device further being characterised therein that the piston comprises a substantially hollow cylindrical body terminating at opposing ends thereof in a base wall and top wall respectively for sealing a hollow interior of the piston body;
  • FIGURE 1 is a perspective view of a PRIOR ART pressure piston with the piston in a first position in which it would be engaging a cylinder (not shown);
  • FIGURE 2 is a longitudinal sectional side elevation of the pressure piston of Figure
  • FIGURE 3 is a perspective view of the PRIOR ART pressure piston of Figure 1 with the piston in a second position in which it would be disengaged from the cylinder;
  • FIGURE 4 is a longitudinal sectional side elevation of the pressure piston of Figure
  • FIGURE 5 is an exploded perspective view of a variable port pressure device according to the INVENTION
  • FIGURE 6 is an assembled perspective view of a variable port pressure device according to the INVENTION with the piston in a first position in which it would be engaged with a cylinder (not shown);
  • FIGURE 7 is a longitudinal sectional side elevation of the pressure piston of Figure
  • FIGURE 8 is an assembled perspective view of a variable port pressure device according to the INVENTION with the piston in a second position in which it would be disengaged from the cylinder (not shown);
  • FIGURE 9 is a longitudinal sectional side elevation of the pressure piston of Figure
  • a pressure piston device [1 ] typically includes a piston housing [2] and a pressure-actuated piston [3] which is longitudinally axially displaceable within the piston housing [2]
  • the piston [3] includes a cylinder-engaging arm [4] which protrudes through an elongate slot [5] within a wall of the piston housing [2]
  • the piston [3] is displaceable within the piston housing [2] between a first position, in which the cylinder-engaging arm [4] engages a cylinder (not shown), and a second position in which the cylinder-engaging arm [4] is disengaged from the cylinder.
  • the piston [3] has an even, pressure actuated end, base wall [6] and a piston diameter [X] of approximately 8mm. As a result, approximately 3 BAR of pressure is required to displace the cylinder-engaging arm [4] of the piston [3] into full disengagement from the cylinder.
  • Figures 5 to 9 illustrate a variable port pressure device [10] according to the invention.
  • the device [10] is particularly suitable for, although not limited to, use in a Multiple Grenade Launcher which includes a rotating cylinder (not shown).
  • the device [10] includes a piston housing [12] arranged approximate the cylinder and a complimentarily configured pressure-actuated piston [14] which is displaceable within the piston housing [12] between a first position ( Figures 6 and 7), in which it is operatively engaged with the cylinder, and a second position ( Figures 8 and 9) in which it is operatively disengaged from the cylinder.
  • the pressure-actuated piston [14] is longitudinally axially displaceable within the piston housing [12] between the first and second positions.
  • the piston housing [12] includes a slot [13] within a wall of the piston housing [12].
  • the piston [14] includes a cylinder-engaging arm [15] which is connected to the piston [14] and which protrudes through the slot [13] of the piston housing [12].
  • the cylinder-engaging arm [15] engages the cylinder
  • the cylinder-engaging arm [15] is disengaged from the cylinder.
  • the device [10] includes, as a first feature, at least one groove [16] extending about an exterior wall surface [14.1 ] of the piston [14] and/or an interior wall surface [12.1] of the piston housing [12].
  • the groove [16] creates a tortuous gas flow path between the exterior wall surface [14.1 ] of the piston [14] and the interior wall surface [12.1 ] of the piston housing [12] for decreasing gas leakage during a firing process.
  • the device [10] includes two continuous grooves [16] which circumferentially extend about the exterior wall surface [14.1 ] of the piston [14] about a lower region of the piston [14].
  • Each groove [16] is bordered by two groove threads [18], with a small clearance existing between tips of the groove threads [18] and the interior wall surface [12.1 ] of the piston housing [12].
  • the two grooves [16] which are longitudinally axially displaced relative to each other, create a labyrinth type of seal between the piston [14] and the piston housing [12], the arrangement being such that gas released by the firing process becomes entrapped within the labyrinth-type grooves [16], thereby decreasing gas leakage, increasing effective displacement of the piston [14] between the first and second positions, and increasing indexing of the weapon after each successive shot.
  • the grooves [16] are aligned with the slot [13] within the wall of the piston housing [12] when the piston is displaced to the second position (refer Figures 8 and 9).
  • the device [10] is characterised therein that the piston [14] comprises a substantially hollow cylindrical body [14.2]
  • the hollow cylindrical body [14.2] terminates at opposing ends thereof in a base wall [20] and top wall [22] respectively for sealing the hollow interior [14.3] of the piston body [14.2] to prevent ingress of dirt or other elements into the piston body [14.2]
  • the device [10] is further characterised therein that the piston [14] terminates at one thereof in a substantially concave base wall [20], so as to increase pressure surface area at a pressure actuated end of the piston [14]
  • the piston diameter [Y] is approximately 12mm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

L'invention concerne un dispositif de pression à orifice variable (10) ou un bouchon de gaz, pouvant être utilisé sur un lanceur de grenade multiple et conçu pour améliorer l'indexation d'une telle arme, en particulier lorsqu'il est utilisé avec une munition à vitesse inférieure. Le dispositif comprend un piston (14) qui peut être déplacé coaxialement à l'intérieur d'un logement de piston (12), le piston (14) comprenant une rainure (16) s'étendant autour d'une surface de paroi extérieure (14.1) du piston (14) de manière à créer un trajet d'écoulement de gaz tortueux entre le piston (14) et le logement de piston (12) et un corps cylindrique creux (14.2) qui se termine à une extrémité de celui-ci dans une paroi de base concave (20).
PCT/IB2019/056002 2018-07-17 2019-07-15 Dispositif de pression à orifice variable destiné à être utilisé sur un lanceur de grenade multiple WO2020016731A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2021/00366A ZA202100366B (en) 2018-07-17 2021-01-18 Variable port pressure device for use on a multiple grenade launcher

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201804758 2018-07-17
ZA2018/04758 2018-07-17

Publications (1)

Publication Number Publication Date
WO2020016731A1 true WO2020016731A1 (fr) 2020-01-23

Family

ID=69164342

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2019/056002 WO2020016731A1 (fr) 2018-07-17 2019-07-15 Dispositif de pression à orifice variable destiné à être utilisé sur un lanceur de grenade multiple

Country Status (2)

Country Link
WO (1) WO2020016731A1 (fr)
ZA (1) ZA202100366B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564684A (en) * 1946-04-10 1951-08-21 John C Garand Mounting of grenade launcher on firearm with stabilizer
RU2284008C1 (ru) * 2005-03-29 2006-09-20 Станислав Борисович Чернов Надкалиберная ружейная граната
US20120180648A1 (en) * 2011-01-14 2012-07-19 ArmWest, LLC. Firearm
JP2013015306A (ja) * 2011-07-06 2013-01-24 Kenhiro Miyata 高圧空気を用いた多目的グレネードランチャー型発射機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564684A (en) * 1946-04-10 1951-08-21 John C Garand Mounting of grenade launcher on firearm with stabilizer
RU2284008C1 (ru) * 2005-03-29 2006-09-20 Станислав Борисович Чернов Надкалиберная ружейная граната
US20120180648A1 (en) * 2011-01-14 2012-07-19 ArmWest, LLC. Firearm
JP2013015306A (ja) * 2011-07-06 2013-01-24 Kenhiro Miyata 高圧空気を用いた多目的グレネードランチャー型発射機

Also Published As

Publication number Publication date
ZA202100366B (en) 2021-09-29

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