US3614907A - Blow-out disc - Google Patents

Blow-out disc Download PDF

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Publication number
US3614907A
US3614907A US806373A US3614907DA US3614907A US 3614907 A US3614907 A US 3614907A US 806373 A US806373 A US 806373A US 3614907D A US3614907D A US 3614907DA US 3614907 A US3614907 A US 3614907A
Authority
US
United States
Prior art keywords
disk
radial
constriction
supporting members
disc
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.)
Expired - Lifetime
Application number
US806373A
Other languages
English (en)
Inventor
Nils E Haglund
Knut G Knutsson
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.)
Foerenade Fabriksverken AB
Original Assignee
Foerenade Fabriksverken AB
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 Foerenade Fabriksverken AB filed Critical Foerenade Fabriksverken AB
Application granted granted Critical
Publication of US3614907A publication Critical patent/US3614907A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F41A1/00—Missile propulsion characterised by the use of explosive or combustible propellant charges
    • F41A1/08—Recoilless guns, i.e. guns having propulsion means producing no recoil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41F—APPARATUS FOR LAUNCHING PROJECTILES OR MISSILES FROM BARRELS, e.g. CANNONS; LAUNCHERS FOR ROCKETS OR TORPEDOES; HARPOON GUNS
    • F41F3/00—Rocket or torpedo launchers
    • F41F3/04—Rocket or torpedo launchers for rockets

Definitions

  • the invention relates to an improved damming washer unit used in recoilless guns, for closing the rear end of the barrel.
  • a washer or disk of a known type is usually made of rubber, Bakelite, paper laminate or some other relatively fragile material so that the disk will break suddenly when a certain desired gas pressure is reached in the combustion chamber when launching a round.
  • the dangerous area behind the gun is partly determined by the rather constant fire flame and the overpressure shock wave, possibly 20-30 feet for guns of this type, but portions and remnants of a conventional disk will occasionally be thrown considerably further backwards, sometimes up to 300 feet, in totally unpredictable directions.
  • the risk of body injury is strangely enough, greater for personnel in the operating military unit, than for the gun service men.
  • the main object of the invention is to provide a damming unit that does not emit any splits or fragments and that can be adapted to all kinds of open recoilless guns, though preferably those having a rather long subcalibre combustion chamber.
  • the disk itself is made of rather thin ductile metal such as aluminum alloy. It is provided with a number of weakened lines with the result that it will split into coherent fragments that will stay in the gun because they become folded over a number of supporting members located behind the disk.
  • FIG. 1 is a general view of the arrangement, with one half of the barrel of the gun cut away;
  • FIG. 2 is a longitudinal sectional view of the barrel with the combustion chamber not shown in section;
  • FIG. 3 is a view from the rear, looking into the Venturi of the gun.
  • FIGS. 4 and 5 respectively show details of a disk fragment before and after a round has been fired.
  • a sub-calibre high pressure powder charge combustion chamber 2 of known type In the gun barrel shown at 1 is arranged a sub-calibre high pressure powder charge combustion chamber 2 of known type, the rear end 13 of which has a number of centering radial supports 3.
  • the supports 3 rest against the leading, annular shoulder or surface of a constriction section 4 provided in the rear end of the barrel, said surface forming an annular ledge or shoulder.
  • the chamber 2 projects rearwardly somewhat beyond the constriction and into the beginning of the Venturi.
  • the periphery of the front surface of a substantially fiat and circular disk 6 having a large center opening or hole, is passed over the chamber end 13 and is brought into contact with the trailing annular surface or ledge 5 of the constriction.
  • a short tube 8 is fitted onto the rear of the chamber 2 behind the disk 6.
  • the tube 8 has a number of radial supporting vanes 7. These vanes press against the rear surface of the disk 6 since the tube 8 is threaded and is urged forwardly by means of a nut 12 that is threaded onto the threaded rearmost part 12 of the chamber 2.
  • the tube 8, the disk 6 and the chamber 2 consequently form a unit that is firmly clampingly held in the barrel by means of the nut 12 that brings the two sets of radial supports 3 and 7 to grip firmly around the constriction 4.
  • the disk 6 has, as abovementioned, a center hole having substantially the same diameter as the tube 8 and it is provided with a number of radially-directed weakened lines 9 for points of fracture.
  • the disk can also be provided with a number, preferably two, of stamped or elevated marks or ridges 10 that will lightly engage the leading edge of one of the radial supports 10. The ridges 10 are so located that the weakenings 9 will lie about midway between two adjacent vanes, thus facilitating the correct positioning of the disk when it is assembled.
  • a damming unit for use in a recoilless gun comprising, a barrel provided with a rear annular constriction lodging a round of ammunition, one end of the constriction receiving a breakable disk at the end of a sub-calibre combustion chamber, said chamber having a threaded end extending through the constriction, the chamber having front and rear sets of radial supports for clamping the constriction to keep the chamber in correct axial and radial position, the disk being an annular ductile metal disk arranged with its marginal edge portion in contact with a rear annular ledge provided on the constriction, the rear surface of said disk being in contact with the forward edges of the rear set of radial supports, the disk having a plurality of radial weakened lines corresponding in number to the number of radial supports in the rear set, with each radial weakened line being located in spaces between the radial supports and approximately midway between adjacent radial supports so that the disk upon the firing of a round, will separate along its lines into tab-like portions
  • a damming unit according to claim 1, wherein there is provided at least two elevated ridges on the disk surface that faces the leading edges of the members of the rear set of the radial supports, said ridges engaging said leading edge thus preventing the disk from being rotationally displaced, said ridges being so located that the radial weakened lines are approximately mid-way between adjacent supporting members,
  • a damming unit for use in a recoilless gun comprising, a barrel provided with a combustion chamber located within it, the rear end of the combustion chamber being concentrically surrounded by a tube, the tube having a number of radial vanes acting to center the chamber within the barrel of the gun, the chamber having a rear threaded end, a nut threadably received on said threaded end and acting to urge the tube forwardly, a substantially fiat and circular disk composed of ductile metal, said disk being provided with a number of radially-directed weakened lines designating points of fracture for the disk so that the disk when fractured at said points will be formed With a number of tabs, the disk having a center hole through which the rear end of the combustion chamber passes, the nut being effective to force the vanes against the back surface of the disk by the tightening of said nut, a shouldered constriction in the barrel aginst which the front surface of the disk is pressed by the urging of the nut, the said disk upon the firing of a
  • a disk according to claim 3 having at least two elevated ridges on the disk surface facing the leading edge of the supporting vanes, said ridges engaging said leading edge, thus preventing the disk from being rotationally displaced, the ridges engaging at least one of the vanes, the ridges when being so located, causing the radial weakened lines to be disposed approximately midway between the adjacent supporting vanes.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Toys (AREA)
  • Electron Beam Exposure (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US806373A 1966-10-04 1969-03-12 Blow-out disc Expired - Lifetime US3614907A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1335866 1966-10-04

Publications (1)

Publication Number Publication Date
US3614907A true US3614907A (en) 1971-10-26

Family

ID=20297265

Family Applications (1)

Application Number Title Priority Date Filing Date
US806373A Expired - Lifetime US3614907A (en) 1966-10-04 1969-03-12 Blow-out disc

Country Status (9)

Country Link
US (1) US3614907A (fr)
BE (1) BE704628A (fr)
CH (1) CH467989A (fr)
DE (1) DE1578010B2 (fr)
DK (1) DK129209B (fr)
ES (1) ES345709A1 (fr)
GB (1) GB1204904A (fr)
NL (1) NL149002B (fr)
NO (1) NO118837B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5900575A (en) * 1995-04-11 1999-05-04 Simbal Ab, A Corp. Of Sweden Bottom plate member
US20050217468A1 (en) * 2003-06-05 2005-10-06 Saab Ab Arrangement for weapon

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE413696B (sv) * 1976-06-15 1980-06-16 Foerenade Fabriksverken Anordning vid rekylfritt vapen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5900575A (en) * 1995-04-11 1999-05-04 Simbal Ab, A Corp. Of Sweden Bottom plate member
US20050217468A1 (en) * 2003-06-05 2005-10-06 Saab Ab Arrangement for weapon
US7191693B2 (en) * 2003-06-05 2007-03-20 Saab Ab Arrangement for weapon

Also Published As

Publication number Publication date
NL149002B (nl) 1976-03-15
DK129209B (da) 1974-09-09
ES345709A1 (es) 1968-11-16
NO118837B (fr) 1970-02-16
DE1578010A1 (de) 1971-04-01
DE1578010B2 (de) 1976-02-12
GB1204904A (en) 1970-09-09
NL6713510A (fr) 1968-04-05
DK129209C (fr) 1975-01-27
BE704628A (fr) 1968-02-15
CH467989A (fr) 1969-01-31

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