EP0203762A1 - Aufsatz für Platzpatronenbeschuss - Google Patents

Aufsatz für Platzpatronenbeschuss Download PDF

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Publication number
EP0203762A1
EP0203762A1 EP86303731A EP86303731A EP0203762A1 EP 0203762 A1 EP0203762 A1 EP 0203762A1 EP 86303731 A EP86303731 A EP 86303731A EP 86303731 A EP86303731 A EP 86303731A EP 0203762 A1 EP0203762 A1 EP 0203762A1
Authority
EP
European Patent Office
Prior art keywords
barrel
blank
restrictor
blank firing
attachment
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Withdrawn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
EP86303731A
Other languages
English (en)
French (fr)
Inventor
Peter William Waters Fuller
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of EP0203762A1 publication Critical patent/EP0203762A1/de
Withdrawn legal-status Critical Current

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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
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/26—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means specially adapted for recoil reinforcement, e.g. for training purposes

Definitions

  • This invention relates to firearms, and in particular to blank firing attachments for fully or semi-automatic firearms.
  • a known method of restricting the expansion of the gases is to attach a blank firing attachment over the muzzle of the barrel in the form of a barrel restrictor, that is a device which restricts the bore of the barrel by providing only a relatively small exit through which the gases must pass to escape the muzzle of the barrel, the area of the exit being chosen to restrict the outflow sufficiently to achieve the required back pressure.
  • a known blank firing attachment of this kind is in the form of a cap having a central gas emission hole which is screwed onto the muzzle of the barrel by means of a threaded portion on the outer surface of the end of the barrel.
  • Blank firing attachments of this type cannot, however, be attached to firearms having barrels which do not protrude from their receivers. It is the object of the present invention to provide a blank firing attachment that can be used with such firearms that have rifled barrels.
  • a blank firing attachment for a firearm having a rifled barrel comprising a barrel restrictor having a barrel engagement means rotatably engageable with the rifling of the barrel, and a restraining means which acts to prevent rotation of the barrel restrictor relative to the barrel during firing of the firearm.
  • the blank firing attachment When a firearm is to be converted to the blank firing mode the blank firing attachment is inserted into the gun barrel by rotating the barrel engagement means so that the barrel restrictor restricts the bore of the barrel. When a blank round is fired the backpressure generated by the blank firing attachment acts to urge the barrel restrictor from the barrel. Because the restrictor is engaged with the rifling of the barrel it can only move out of the barrel if it rotates relative to it. The restraining means prevents this rotation and so the blank firing attachment is retained in position.
  • the barrel restrictor is provided with a rotation means whereby the barrel restrictor is rotatable during insertion into the barrel.
  • a blank firing attachment 2 which has a barrel restrictor 4 in the form of a steel tube 6 having a breech end 7 and a muzzle end 8, the end 8 being partially closed by a steel plug 10 welded to the tube 6.
  • a gas emission hole 12 drilled through the plug coaxially with the tube 6 provides an exit for gases generated during the firing of a blank round which is of sufficient restriction to generate the required back pressure for operating the known automatic mechanisms of the specific firearm to which it is attached.
  • the dimensions of the gas emission hole necessary to restrict the gases sufficiently will vary from firearm to firearm and with the type of blank ammunition used but the appropriate dimensions are readily found by trial and error.
  • the tube 6 is provided with raised screw threads 16, constituting the barrel engagement means, proud of the outer surface of the tube 6 and dimensioned to engage as an easy sliding fit with the rifling of the gun barrel.
  • the screw threads 16 act to seal the rifling, so largely preventing the gases escaping from the barrel other than through the gas emission hole 12.
  • the tube 6 is inserted into the barrel by engaging the threads 16 with the rifling of the barrel and rotating the blank firing attachment 2 to screw it into the barrel by means of a screwdriver slot 14, constituting the rotation means, cut into the end of the plug 10.
  • a screwdriver slot 14 constituting the rotation means, cut into the end of the plug 10.
  • lugs 17, constituting the restraining means Pivotally attached to the plug 10 are lugs 17, constituting the restraining means, in which are drilled fixing holes 18 which can be aligned with a through hole in the body of the Heckler and Koch sub-machine gun (not shown) when the blank firing attachment is in position.
  • lugs 17 in the embodiment shown in Figures 1 to 4 is dependent on the design of the receiver of the particular firearm with which it is to be used and that if a blank firing attachment acccrding to the present invention is made for another weapon a different shape of lug 17 will generally be necessary.
  • the form of lugs is not restricted to the shape shown in the embodiments here described but may take any form which is able to prevent the barrel restrictor rotating relative to the barrel during firing.
  • a clamping mechanism may be fixed to an-arm attached to the barrel restrictor or, if the barrel moves relative to the receiver during firing of the blank, the restraining means can take the form of one or more pivoted arms which can pivot to allow movement of the blank firing attachment with the barrel relative to the receiver but not so as to allow the barrel restrictor to rotate within the barrel.
  • the tube 6 has a mark (not shown) to indicate to the user the necessary orientation of the tube 6 on initial entry into the barrel to ensure that the lugs 17 are in the correct position on fully inserting the attachment 2.
  • the restraining means need not be in the form of a lug or lugs but should be understood as including any means which restrains the barrel restrictor from rotating during firing. In particular it need not require the prior fixing of a physical connection between the barrel restrictor and some other part of the firearm.
  • the tube 6 can be of a resilient material having a thickness which allows it to distort during firing of the blank under the action of the pressure generated by the gases so as to grip the inner surface of the gun barrel and thereby prevent rotation of the barrel restrictor by frictional grip with the inner surface of the barrel and enhance the sealing between the attachment and the barrel.
  • the restraining means comprises a member or members that connect the blank firing attachment to the firearm, as the lugs 17 in the described embodiments, it may be possible to use those members as the insertion means if they are fixed securely enough to the blank firing attachment.
  • the blank round commonly used with the MP5KA1 is the 9mm round sold under the trade name GEECO.
  • This round has a rounded plastic dummy bullet about 7.5mm in diameter set centrally into the end of a 9mm cartridge with a cross indentation on its nose so that upon firing the blank the bullet petals open allowing the propellant gas to escape into the barrel of the firearm.
  • the petalled bullet is retained in the case, extracted with it and discarded.
  • the presence of this rounded dummy bullet allows the round to be loaded in automatic weapons since the round can be chambered and extracted automatically: a blunt nose design does not ride up from the magazine to move smoothly into the chamber.
  • the tube 6 of the blank firing attachment illustrated in Figures 1-4 is long enough to extend back to the breech when fully inserted into the barrel and has an inner diameter small enough to prevent the chambering of a live 9mm ball round but large enough to allow the blank GEECO blank cartridge to chamber. This provides an extra safety feature when using the above described blank firing attachment shown in the above described embodiments with the GEECO blank round but it will be appreciated that it is not necessary to have this additional advantage for the operation of the blank firing attachment according to the present invention.
  • barrel engagement means may also be used.
  • the barrel engagement means comprises screw thread portions 22 and raised studs 24.
  • the screw threads 22 should be long enough to seal the rifling.
  • the raised studs 24 forward of the screw thread portions 22 provide support and alignment for the muzzle end 8 of the tube 6 thereby reducing the need to machine a mirror image of the rifling thread along the whole length of the tube 6.
  • FIG 4 there is shown part of an alternative blank firing attachment 26 similar to the one illustrated in Figures 1 to 3 except that it is provided with a plug 28 having a gas emission hole 30 which is orientated to direct the escaping gases radially with respect to the tube 6.
  • This arrangement permits the firearm to be pointed at a person during firing without danger.
  • the preferred material for the tube 6 is steel which gives durability and resilience. Fowever, the cost of manufacture in steel is high and it is envisaged that a suitable alternative would be a plastic or filled resin casting with a metal insert in which is forred a gas emission hole.
  • a further advantage of the present invention is that no permanent alteration to the firearm is necessary to allow it to be used in a blank round or live round firing mode and that the firearm can retain its ability to fire normal live rounds of ammunition.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)
EP86303731A 1985-05-16 1986-05-16 Aufsatz für Platzpatronenbeschuss Withdrawn EP0203762A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB858512399A GB8512399D0 (en) 1985-05-16 1985-05-16 Blank firing attachment
GB8512399 1985-05-16

Publications (1)

Publication Number Publication Date
EP0203762A1 true EP0203762A1 (de) 1986-12-03

Family

ID=10579232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86303731A Withdrawn EP0203762A1 (de) 1985-05-16 1986-05-16 Aufsatz für Platzpatronenbeschuss

Country Status (2)

Country Link
EP (1) EP0203762A1 (de)
GB (2) GB8512399D0 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1671327A (en) * 1927-04-12 1928-05-29 Rene R Studler Muzzle attachment for automatic guns
DE1185512B (de) * 1962-06-20 1965-01-14 Rheinmetall Gmbh Manoeverpatronengeraet fuer Maschinengewehre und aehnliche Feuerwaffen mit beweglichem Rohr
US3678609A (en) * 1970-06-25 1972-07-25 Joseph Fazio Safety plug for firearms
US3744370A (en) * 1970-03-02 1973-07-10 Us Army Blank firing attachment
US4084340A (en) * 1976-08-30 1978-04-18 Gilbert Galde Scudder Gun bore rust inhibiting method and apparatus
FR2379041A1 (fr) * 1977-01-28 1978-08-25 France Etat Dispositif de tir a blanc pour arme a culasse inertielle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1671327A (en) * 1927-04-12 1928-05-29 Rene R Studler Muzzle attachment for automatic guns
DE1185512B (de) * 1962-06-20 1965-01-14 Rheinmetall Gmbh Manoeverpatronengeraet fuer Maschinengewehre und aehnliche Feuerwaffen mit beweglichem Rohr
US3744370A (en) * 1970-03-02 1973-07-10 Us Army Blank firing attachment
US3678609A (en) * 1970-06-25 1972-07-25 Joseph Fazio Safety plug for firearms
US4084340A (en) * 1976-08-30 1978-04-18 Gilbert Galde Scudder Gun bore rust inhibiting method and apparatus
FR2379041A1 (fr) * 1977-01-28 1978-08-25 France Etat Dispositif de tir a blanc pour arme a culasse inertielle

Also Published As

Publication number Publication date
GB8611971D0 (en) 1986-06-25
GB8512399D0 (en) 1985-06-19
GB2175379A (en) 1986-11-26
GB2175379B (en) 1988-09-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Withdrawal date: 19870525

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Inventor name: FULLER, PETER WILLIAM WATERS