EP1481213A1 - Mecanisme de retenue de la charge dans un canon - Google Patents

Mecanisme de retenue de la charge dans un canon

Info

Publication number
EP1481213A1
EP1481213A1 EP03711689A EP03711689A EP1481213A1 EP 1481213 A1 EP1481213 A1 EP 1481213A1 EP 03711689 A EP03711689 A EP 03711689A EP 03711689 A EP03711689 A EP 03711689A EP 1481213 A1 EP1481213 A1 EP 1481213A1
Authority
EP
European Patent Office
Prior art keywords
charge
charge retaining
retaining mechanism
mechanism according
barrel
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Withdrawn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
EP03711689A
Other languages
German (de)
English (en)
Inventor
Ernst Johann Heinrich MÜLLER
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.)
Denel Pty Ltd
Original Assignee
Denel Pty Ltd
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 Denel Pty Ltd filed Critical Denel Pty Ltd
Publication of EP1481213A1 publication Critical patent/EP1481213A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A9/00—Feeding or loading of ammunition; Magazines; Guiding means for the extracting of cartridges
    • F41A9/54—Cartridge guides, stops or positioners, e.g. for cartridge extraction
    • F41A9/58—Cartridge stops; Cartridge positioners

Definitions

  • This invention relates to a charge retaining mechanism for retaining a projectile charge in a barrel of a gun such as a cannon or the like. This invention further relates to a gun and a barrel for a gun, both provided with such a charge retaining mechanism.
  • a charge retaining means known as a "Swiss" groove formation for retaining a cylindrical charge inside a barrel chamber of a cannon, comprises a semicircular off-centre cutaway portion in the operatively lower wall of the barrel chamber.
  • a projectile is rammed into the chamber of the barrel. Thereafter the charge is inserted into the chamber past the "Swiss” groove formation and released. The charge slides backwardly into the "Swiss” groove formation, with a lower end of the charge being retained by a lower end of the "Swiss” groove formation.
  • a first disadvantage of the "Swiss" groove formation is that the formation fills up with dirt and grime, making it ineffective and dangerous as the formation no longer retains the charge when filled up, so that the charge falls out of the barrel.
  • a second disadvantage is that it is relatively difficult and tedious to clean the formation regularly.
  • a third disadvantage is that the groove changes the chamber volume of the barrel chamber, which not only affects the operation of the cannon, but also changes the specifications of the barrel to parameters falling outside the Joint Ballistic Memorandum of Understanding.
  • a fourth disadvantage of the "Swiss" groove formation is that it is relatively difficult to manufacture, because it has to be cut into the chamber wall using a relatively large lathe. As the groove formation is disposed off-centre, the lathe bearings are subjected to extreme and severe loads by the unbalanced weight of the barrel when the barrel is being rotated on the lathe, causing unnecessary wear and tear of the lathe.
  • Another known charge retaining means comprises a retaining device and a resiliently flexible annular flange formation extending and flaring outwardly from a lower end of the charge.
  • the flange formation deforms inwardly and frictionally engages the inside of the barrel when the charge is inserted, thus retaining the charge in position.
  • a disadvantage of a retaining device of this type is that the annular flange formation tends to interfere with the interchageability of different charge types, owing to the differences in configuration of respective ammunition handling systems.
  • a charge retaining mechanism for retaining a charge inside a chamber of a barrel of a gun comprising a charge retaining member which extends into the chamber of the barrel and which is movable between a charge passing position and a charge retaining position.
  • the charge retaining member may be biased towards the charge retaining position.
  • the charge retaining mechanism may include biasing means for biasing the charge retaining member towards the charge retaining position.
  • the biasing means may be in the form of a coil spring.
  • the charge retaining mechanism may further include a groove formation in the inner surface of the barrel chamber and which extends at least partially around the inner circumference of the barrel.
  • the coil spring may be located inside the groove formation.
  • Opposite ends of the groove formation may progressively cut deeper into the inside surface of the barrel chamber towards the full depth of the groove formation until a constant depth is reached.
  • the groove formation may be circular in cross-section. Furthermore, a slit of the groove formation may be relatively narrower than the diameter thereof, the arrangement being such that the groove formation is adapted such that the coil spring is located inside the groove formation by feeding the coil spring into the groove formation from one end. This configuration of the groove may therefore be referred to as a choked groove.
  • the charge retaining member may comprise a protrusion extending from the coil spring into the chamber of the barrel, through the slit of the groove formation.
  • the charge retaining mechanism may further include limiting means for limiting movement of the charge retaining member past the charge retaining position.
  • the limiting means may be provided by a side wall of the groove formation, with a portion of a side wall opposite to the limiting means, complementary to the protrusion, being removed to allow the protrusion to move to the charge passing position.
  • the charge retaining member is a first member and the charge retaining mechanism may include two sets of further members extending from the same coil spring and spaced from the first member, the arrangement being such that a central retaining member and two sets of end retaining members are provided.
  • Each set of end retaining members may include three adjacent retaining members.
  • the arrangement may further be such that the winding direction of the portions of the coil spring between the sets of end retaining members and the end of the coil spring extends in a first direction and the winding direction of the portions of the coil spring between each set of end retaining members and the central retaining member extends in an opposite direction.
  • the winding direction of the portions of the coil spring between adjacent retaining members of each set may be in the same direction, the arrangement being such that the adjacent retaining members of each set are biased in the same direction.
  • a barrel for a gun including a charge retaining mechanism according to the first aspect of the invention.
  • a gun including a charge retaining mechanism according to the first aspect of the invention.
  • figure 1 is a cross sectional view along line B-B 1 in figure 2 of a barrel chamber of a gun provided with a charge retaining mechanism according to a preferred embodiment of the invention
  • figure 2 is a longitudinal sectional view along line A-A 1 in figure 1 ;
  • figure 3 is a sectional view along line C-C 1 in figure 1 , with the charge retaining mechanism in a charge passing position; and figure 4 is the same view as that of figure 3, with the charge retaining member in a charge retaining position.
  • a mechanism according to a first preferred embodiment of the invention for retaining a charge 12 inside the chamber 14 of a barrel 16 of a gun (not shown), is generally designated by reference numeral 10.
  • the charge retaining mechanism 10 comprises charge retaining members including a central retaining member 18.1 and two sets of end retaining members 18.2, extending from a biasing means in the form of an elongate coil spring 20, into the chamber 14 of the barrel 16.
  • Each set of end retaining members 18.2 consist of three adjacent retaining members 18.2.1.
  • the coil spring 20 is located in an elongate groove formation 22 cut into the inner surface of the barrel 16 and extending partially about the inner circumference of the barrel 16.
  • the arrangement is such that the members 18.1 and 18.2 extend through an opening or slit 24 of the groove formation 22 into the chamber 14.
  • the groove formation 22 is a so-called choked groove and is circular in cross- section, with the opening or slit 24 being relatively narrower than the diameter of the groove formation 22.
  • Opposite ends of the groove formation 22 are progressively cut deeper into the inside surface of the barrel 16 towards the full depth of the groove formation 22 until a constant depth is reached.
  • the coil spring 20 is disposed inside the groove formation 22 by feeding the coil spring 20 into the groove formation 22 from one end.
  • the charge retaining members 18.1 and 18.2 are movable relative to the charge, between a charge passing position (shown in figure 3) and a charge retaining position (shown in figure 4).
  • the charge retaining mechanism 10 further includes a limiting means 26.1 and 26.2 for limiting the movement of the charge retaining members 18.1 and 18.2 past the charge retaining position.
  • the limiting means is provided by a side wall 26.1 of the groove formation 22. A portion of an opposite side wall 26.2, complementary to the protrusion, is removed to allow the charge retaining members 18.1 and 18.2 to move to the charge passing position.
  • the retaining members 18.1 and 18.2 are biased in the direction of the charge retaining position by means of the coil spring 20.
  • the direction of the windings of the coil spring 20 between the end of the coil spring 20 and the sets of end retaining members 18.2 is different to the direction of the windings of the coil spring 20 between the sets of end retaining members 18.2 and the central retaining member 18.1.
  • the winding direction of the portions of the coil spring 20 between adjacent retaining members 18.2.1 of each set of end retaining members 18.2 is in the same direction, the arrangement being such that the adjacent retaining members 18.2.1 of each set of end retaining members 18.2 are biased in the same direction.
  • a projectile (not shown) is first rammed into the chamber 14 of the barrel 16. Thereafter, the charge 12 is inserted (shown by arrow F in figure 3) into the chamber 14, with the charge 12 forcing the charge retaining members 18.1 and 18.2 against the bias of the coil spring 20 to the charge passing position. After the charge 12 has passed the members 18.1 and 18.2, the coil spring 20 returns the members 18.1 and 18.2 to the charge retaining position. The charge then slides backwardly (shown by arrow G in figure 4) against the charge retaining members 18.1 and 18.2. The charge 12 is thus retained inside the barrel 16.
  • the charge retaining mechanism 10 is relatively inexpensive and the groove formation 22 is easy to manufacture compared to the prior art.
  • the charge retaining mechanism 10 according to the invention is further not particularly sensitive to accumulation of dirt and grime. It further provides a high level of reliability without any significant changes in chamber volume.
  • the groove formation 22 can be conveniently manufactured by using an articulated ball head drill (not shown).
  • the ball head of the drill is gradually cut into the inner surface of the barrel 16 until a desired depth is reached. Thereafter the groove formation 22 is cut at a constant depth partially along the circumference of the chamber, after which the groove 22 is gradually cut out of said surface. No heavy-duty lathe is therefore required to cut the groove 22 and the integrity of the barrel 16 is retained during the manufacturing process.
  • the groove formation is in the form of an open U-shaped groove.
  • a relatively larger retainer ring is fed into the retainer mechanism spring, all of which is then inserted into the open U-shaped groove and left to radially expand into and lock in the groove.

Landscapes

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

Abstract

Cette invention concerne un mécanisme de retenue de la charge (10), qui sert à retenir une charge (12) à l'intérieur d'une chambre (14) de canon (16) d'une arme. Le mécanisme comprend des éléments de retenue constitués d'un élément de retenue central (18.1) et de deux ensembles d'éléments de retenue d'extrémité (18.2) qui s'étendent à l'intérieur de la chambre (14) à partir d'un ressort hélicoïdal allongé (20). Le ressort hélicoïdal (20) est situé dans une formation à rainures allongée (22) découpée dans la surface intérieure du canon (16) et s'étendant partiellement autour de la circonférence intérieure du canon (16). Les éléments de retenue centraux (18.1, 18.2) peuvent être déplacés entre une position de libération de la charge et une position de retenue de la charge, et sont sont sollicités dans le sens de la position de retenue de la charge au moyen du ressort hélicoïdal (20).
EP03711689A 2002-02-27 2003-02-20 Mecanisme de retenue de la charge dans un canon Withdrawn EP1481213A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA200201644 2002-02-27
ZA200201644 2002-02-27
PCT/ZA2003/000026 WO2003073034A1 (fr) 2002-02-27 2003-02-20 Mecanisme de retenue de la charge dans un canon

Publications (1)

Publication Number Publication Date
EP1481213A1 true EP1481213A1 (fr) 2004-12-01

Family

ID=27766598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03711689A Withdrawn EP1481213A1 (fr) 2002-02-27 2003-02-20 Mecanisme de retenue de la charge dans un canon

Country Status (4)

Country Link
US (1) US20050109202A1 (fr)
EP (1) EP1481213A1 (fr)
AU (1) AU2003215044A1 (fr)
WO (1) WO2003073034A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013005378B3 (de) * 2013-03-28 2014-10-02 Rheinmetall Waffe Munition Gmbh Abschussvorrichtung zum Verschießen patronierter Munition

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
US2796224A (en) * 1955-01-14 1957-06-18 Ernest S Jefferson Fishing reel
US3072105A (en) * 1961-07-05 1963-01-08 Lionel Pacific Inc Lock for fluid pressure actuator
US3226498A (en) * 1962-02-19 1965-12-28 Gen Motors Corp Brush and sealing means for an electric speedometer assembly
US3270538A (en) * 1965-06-11 1966-09-06 Chicago Lock Co Tamper-proof axial tumbler lock
US3534694A (en) * 1968-05-16 1970-10-20 Miehle Goss Dexter Inc Underside lockup for stereotype printing plate
US3574265A (en) * 1968-12-27 1971-04-13 Holiday Products Inc Fish lure with projectable hook assembly
FR2210281A5 (fr) * 1972-12-12 1974-07-05 France Etat
DE2313985C2 (de) * 1973-03-21 1983-10-13 Wegmann & Co, 3500 Kassel Abschußvorrichtung für selbstgetriebene Geschosse
US4730952A (en) * 1986-08-04 1988-03-15 Wiley Edward R Quick change mechanism for circular saw blades
US5871239A (en) * 1996-10-31 1999-02-16 Stanley Aviation Corporation Positive lock coupling
US6050609A (en) * 1996-10-31 2000-04-18 Stanley Aviation Corporation Positive lock coupling
DE29706936U1 (de) * 1997-04-17 1997-07-17 Lauster Peter Kugeldrallsystem für Läufe
DE59802080D1 (de) * 1997-07-04 2001-12-13 Bell & Howell Co Handhabungsstation, insbesondere kuvertiereinrichtung
EP1456912A1 (fr) * 2001-11-21 2004-09-15 Bal Seal Engineering Co. Connecteur permettant de verrouiller et de supporter des capacites de courant avec une connexion sans outil
US6877345B1 (en) * 2003-08-05 2005-04-12 The Eastern Company Combination and key operated padlock with indicator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03073034A1 *

Also Published As

Publication number Publication date
AU2003215044A1 (en) 2003-09-09
WO2003073034A1 (fr) 2003-09-04
US20050109202A1 (en) 2005-05-26

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