US2609731A - Pivoted breech block locking mechanism - Google Patents

Pivoted breech block locking mechanism Download PDF

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Publication number
US2609731A
US2609731A US25485A US2548548A US2609731A US 2609731 A US2609731 A US 2609731A US 25485 A US25485 A US 25485A US 2548548 A US2548548 A US 2548548A US 2609731 A US2609731 A US 2609731A
Authority
US
United States
Prior art keywords
breech
pivoted
recoiling
striker
locking mechanism
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
US25485A
Other languages
English (en)
Inventor
Sahlin Borje
Nyqvist Halvar
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.)
Saab Bofors AB
Original Assignee
Bofors 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
Priority claimed from GB688748A external-priority patent/GB653648A/en
Application filed by Bofors AB filed Critical Bofors AB
Application granted granted Critical
Publication of US2609731A publication Critical patent/US2609731A/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
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/12—Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
    • F41A3/36—Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrel or breech housing
    • F41A3/38—Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrel or breech housing having rocking locking elements, e.g. pivoting levers or vanes
    • F41A3/40—Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrel or breech housing having rocking locking elements, e.g. pivoting levers or vanes mounted on the bolt
    • 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
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/02—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated
    • F41A5/08—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated having an accelerator lever acting on the breech-block or bolt during the opening movement

Definitions

  • Fig. 1 represents a diagrammatic vertical longitudinal section through a portion of a firearm according to the invention, this figure showing the position of the parts at the moment of firing.
  • Fig. 2 is a detail section on line II-II in Fig. 1.
  • Fig. 3 is a longitudinal detail section showing the position of the parts immediately after the firing moment.
  • Fig. 4 is a detail section on line IV--IV in Fig. 3.
  • Fig. 5 is a longitudinal detail section showing the position of the parts immediately before the termination of the recoiling movement.
  • Fig. 6 is a longitudinal detail section showing the position of the parts during the forward movement of the breech.
  • I designates the barrel of a firearm, said barrelbeing displaceably mounted in a guide sleeve-not shown-and in a recoiling jacket 4 coupled to the guide sleeve, an advancing spring 5 being arranged between said recoiling Jacket and the barrel.
  • Screwed fast to Y the barrel I is a breech guide 6, which is provided with two depending lugs 1, in which anunlatching fork 8 with two fork Shanks 8' is pivoted on a shaft 9, which is retained in itsposition by the sides 4' of the recoiling jacket 4.
  • Fork 'Shanks 8' move between two abutments (not The unlatching forkvmay of course Y shown). be mounted in some other part of the recoiling system.
  • a ⁇ striker I6 providedlwith a primingpintt is displaceably"arranged'in the breech', I ⁇ 2 in jthe 'longitudinal direction, thereof.
  • said" striker' fbegingf actuated. by ajstrikerA spring and ⁇ havinga transverse recess 36 adaptedpto receive a' striker bridge 3l, Vwhich; i's' somewhat displaceabl'e, relaitive'ly to' the breech i2 in thejlongitudinal direc'- tion, thereof;
  • Thestrik'er bridge 3l' is displaceable by means oftheslianks 8' oftheunlatch-
  • They striker bridge isl provided with ⁇ oblique lcam surfaces 48 cooperating with oblique ycam surfaces 41' onV breechf latches" 46, which are s'wi'ngably'A or displacea'bly arranged inthe-'breech I2, to bring said latch
  • the mode of operation of the arrangement is as follows, starting from the position of the parts at the moment of firing, as shown in Fig. l.
  • the breech is locked to the tube, While bearing on the rear end of the cartridge introduced into the cartridge chamber, by means of the breech latches 46 and the abutments 5i over the breech guide 6 screwed fast to the barrel I.
  • the striker I6. the priming pin 35 and the striker bridge 31 are in their foremost position, the priming pin havingstruck the percussion cap of the cartridge.
  • the recoiling system that is to say the tube with the breech guide and the breech, move rearwardly.
  • the driving arm 52 of the unlatching fork 8 hits the abutment 53 of the recoiling jacket 4, so that the unlatching fork 8 is swung about its shaft 9 and thefork shanks 8' thereof move the striker bridge 31 rearwardly, which in turn, at straining of the striker spring 39, moves the striker I6 and the priming pin 35 rearwardly, while releasing with its oblique cam surfaces 4B the engagement between the breechV latches 46 and the abutments 5I, so that the breech is made free and will have a rearward initial movement imparted thereto so as to strain operating springs, not shown.
  • the unlatching member mayV be adapted to actuate the breech directly after the faces of the said breech latches upon rearward movement of said element. act so as to unlatch said breech latches and thereafter vact vso as te 'impart a krearward initial movement to said breech, :after said breech latches have been unlatched.
  • the'pivoted unlatching member of said breech unlatchirier mechanism consists of a fork -member, the shanks of said fork being s o disposed as'to'move said element, and wherein said lastunlatching operation. Also, the unlatching. f
  • an automatic firearm having a short bar rel recoil in the longitudinal direction
  • said firearm having a recoiling system which includes a lrecoil jacket, a positivelyjclosed breech block, and Vat least two breech latches each provided with an oblique cam surface and arranged ⁇ between said breech and said recoiling system for locking or unlocking said breech to said recoiling system, said breechlatches being positioned in an "oblique position in'relation to said longitudinal direction whenvsaidbreech is locked to said recoiling system, breech unlatching mechanism,

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US25485A 1945-03-29 1948-05-06 Pivoted breech block locking mechanism Expired - Lifetime US2609731A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2609731X 1945-03-29
GB688748A GB653648A (en) 1948-03-05 1948-03-05 Improvements in or relating to automatic firearms

Publications (1)

Publication Number Publication Date
US2609731A true US2609731A (en) 1952-09-09

Family

ID=32232352

Family Applications (1)

Application Number Title Priority Date Filing Date
US25485A Expired - Lifetime US2609731A (en) 1945-03-29 1948-05-06 Pivoted breech block locking mechanism

Country Status (2)

Country Link
US (1) US2609731A (ko)
BE (1) BE480928A (ko)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730928A (en) * 1951-11-17 1956-01-17 Saetter-Lassen Erik Machine gun
US2762267A (en) * 1951-03-05 1956-09-11 Bofors Ab Safety device for automatic weapons
WO1986002153A1 (en) * 1984-10-05 1986-04-10 Rostocil Charles E Heavy support weapon

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE315615C (ko) *
GB190113382A (en) * 1901-07-01 1902-06-05 Edgar Harrison Improvements relating to Recoil Operated Firearms.
US971061A (en) * 1909-05-20 1910-09-27 Paul Mauser Recoil-loader with fixed barrel.
US1096679A (en) * 1911-11-28 1914-05-12 Rheinische Metallw & Maschf Breech mechanism for automatic firearms.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE315615C (ko) *
GB190113382A (en) * 1901-07-01 1902-06-05 Edgar Harrison Improvements relating to Recoil Operated Firearms.
US971061A (en) * 1909-05-20 1910-09-27 Paul Mauser Recoil-loader with fixed barrel.
US1096679A (en) * 1911-11-28 1914-05-12 Rheinische Metallw & Maschf Breech mechanism for automatic firearms.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762267A (en) * 1951-03-05 1956-09-11 Bofors Ab Safety device for automatic weapons
US2730928A (en) * 1951-11-17 1956-01-17 Saetter-Lassen Erik Machine gun
WO1986002153A1 (en) * 1984-10-05 1986-04-10 Rostocil Charles E Heavy support weapon
US5155292A (en) * 1984-10-05 1992-10-13 Greyden International Heavy support weapon

Also Published As

Publication number Publication date
BE480928A (ko)

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