US2476905A - Breech mechanism for firearms - Google Patents

Breech mechanism for firearms Download PDF

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Publication number
US2476905A
US2476905A US735560A US73556047A US2476905A US 2476905 A US2476905 A US 2476905A US 735560 A US735560 A US 735560A US 73556047 A US73556047 A US 73556047A US 2476905 A US2476905 A US 2476905A
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US
United States
Prior art keywords
breech block
breech
limbs
pin
sear
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
US735560A
Other languages
English (en)
Inventor
Perry Claude Alfred
Wackrow Roger David
Urry Arthur Sydney
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.)
Birmingham Small Arms Co Ltd
Original Assignee
Birmingham Small Arms Co 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 Birmingham Small Arms Co Ltd filed Critical Birmingham Small Arms Co Ltd
Application granted granted Critical
Publication of US2476905A publication Critical patent/US2476905A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41C—SMALLARMS, e.g. PISTOLS, RIFLES; ACCESSORIES THEREFOR
    • F41C7/00—Shoulder-fired smallarms, e.g. rifles, carbines, shotguns
    • F41C7/06—Lever-action guns, i.e. guns having a rocking lever for loading or cocking
    • 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
    • F41A15/00—Cartridge extractors, i.e. devices for pulling cartridges or cartridge cases at least partially out of the cartridge chamber; Cartridge ejectors, i.e. devices for throwing the extracted cartridges or cartridge cases free of the gun
    • F41A15/08—Cartridge extractors, i.e. devices for pulling cartridges or cartridge cases at least partially out of the cartridge chamber; Cartridge ejectors, i.e. devices for throwing the extracted cartridges or cartridge cases free of the gun for block-action guns
    • 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
    • F41A17/00—Safety arrangements, e.g. safeties
    • F41A17/56—Sear safeties, i.e. means for rendering ineffective an intermediate lever transmitting trigger movement to firing pin, hammer, bolt or sear
    • F41A17/62—Thumb-operated sliding safeties mounted on the upside of the stock, e.g. for shotguns
    • 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
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/25—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins
    • F41A19/26—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin and the breech-block or bolt forming one piece
    • 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
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/25—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins
    • F41A19/27—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
    • F41A19/29—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension
    • F41A19/36—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension in block-action guns
    • 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
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/42—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/49—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in block-action guns
    • F41A19/50—Cocking mechanisms
    • 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
    • F41A3/02—Block action, i.e. the main breech opening movement being transverse to the barrel axis
    • F41A3/04—Block action, i.e. the main breech opening movement being transverse to the barrel axis with pivoting breech-block
    • 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
    • F41A3/14—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively
    • F41A3/32—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the bolt being rocked about a notional axis transverse to the barrel axis
    • 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
    • F41A9/01—Feeding of unbelted ammunition
    • F41A9/06—Feeding of unbelted ammunition using cyclically moving conveyors, i.e. conveyors having ammunition pusher or carrier elements which are emptied or disengaged from the ammunition during the return stroke
    • F41A9/09—Movable ammunition carriers or loading trays, e.g. for feeding from magazines
    • F41A9/10—Movable ammunition carriers or loading trays, e.g. for feeding from magazines pivoting or swinging
    • F41A9/13—Movable ammunition carriers or loading trays, e.g. for feeding from magazines pivoting or swinging in a vertical plane
    • F41A9/16—Movable ammunition carriers or loading trays, e.g. for feeding from magazines pivoting or swinging in a vertical plane which is parallel to the barrel axis
    • F41A9/17—Movable ammunition carriers or loading trays, e.g. for feeding from magazines pivoting or swinging in a vertical plane which is parallel to the barrel axis mounted within a smallarm
    • F41A9/19—Movable ammunition carriers or loading trays, e.g. for feeding from magazines pivoting or swinging in a vertical plane which is parallel to the barrel axis mounted within a smallarm feeding from a tubular magazine mounted in the stock

Definitions

  • the present invention is concerned with improvements in or relating to firearms and is particularly, though by no means exclusively, concerned with small-bore firearms of the kind used for miniature target shooting at, for example, fun fairs.
  • Small-bore rearms as used at fun fairs are generally of the blow back type and an attendant inserts a plurality of cartridges in a tubular magazine in the butt end of the firearm.
  • Such firearms must be robust and capable of standing up to mis-handling and ill-usage and particularly the action part of the rearm must be capable of being used more or less constantly over a period of hours.
  • the breech mechanism of a firearm comprises a pivoted sector-shaped bifurcated breech block, a channel in said breech block formed by the limbs thereof and an arcuate web, and a sear member for holding the breech block in a retracted position against the action of a spring.
  • the breech block is pivotally mounted for oscillatory movement on a bottom plate, and has a groove formed in the periphery thereof to receive a projection on a sear also pivotally mounted on the bottom plate.
  • a trip pawl is mounted on a trigger for contact with the sear to release the breech block to the action of a torsion spring so that a firing pin carried by the breech block will strike a cartridge in the firing chamber of the firearm.
  • Cartridges are supplied to the firing chamber from a tubular magazine and pass through a feed tube the outlet end of which is situated adjacent the mouth of the iiring chamber.
  • the feed tube is a pivotally mounted member and as the breech block is oscillated forwardly by its spring it is arranged to Contact the underside cf the tube and cam its forward end upwardly out of the way of the firing pin to allow the latter to strike the rimof a cartridge in the firing chamber.
  • Figure 1 is a left hand side elevation of the mid-portion of the illustrative firearm
  • Figure 2 is a right hand cross-sectional view of the parts shown in Figure l;
  • Figure 3 is a view illustrating the position of various parts during cooking of the rearm
  • Figure 4 is a view similar to Figure 3 but showing the parts in an uncooked position
  • Figure 5 is a rear end elevation of a. breech block of the illustrative rearm
  • Figure 6 is a section taken along the line VI-VI of Figure 5; I
  • Figure 7 is a front end view of the breech block showing particularly a. ring pin carried thereby.
  • Figure 8 is a view similar to Figure 2 but showing the parts in the positions' which they occupy at the instant of firing;
  • Figure 9 is a vertical transverse section on the line 9-9 in Figure 8 but showing the parts in cocked positiomand Figure 10 is a view similar to Figure 9 but showing the positions of the parts at the instant of firing.
  • the illustrative firearm comprises a bottom plate I adapted to be secured to the body 3 of the rearm, the plate being generally U-shaped in cross-section. Pivoted at 5 to the forward end of the bottom plate I is the front end of a combined cooking handle and trigger guard 1. Pivotally mounted upon the pivot pin 5 is a breech block 9 which comprises a sector-shaped member. The member is bifurcated, as is shown in Figure 5, and the two limbs are united by an arcuate cross web II which extends from the rear face of the member for a slight distance forwardly of the same, the space between the limbs and the inner wall of the web being adapted to form a channel for the passage of cartridge cases ejected from the breech chamber of the rearm.
  • ears I3 ( Figure 6) through which the pivot pin 5 passes and a torsion spring I5 coiled round the pivot pin tends normally to urge the breech block in a forward direction about the pivot 5.
  • the periphery of the breech block 9 is provided with a notch I1 on its ⁇ rear face to co-operate with a projection or tooth I9 formed on the front face of a sear member 2
  • a cartridge extractor 23 Pivoted to the breech block 9 and extending along the underface of the web II is a cartridge extractor 23 which comprises a hooked forward end 25 ( Figure 6).
  • a torsion spring 21 surrounds the pivot of the extractor 23 and normally urges the hookshaped end upwardly. Adjacent the forward end face of the web one ci? .the limbs is vdrilled to provide accommodation for a laterally extending fir ing pin 29 ( Figure 7) that stands proud of the web and is situated above the hook-shaped end of the extractor 23.
  • the arrangement of the extractor 23 and pin 29 is such'that as the breech block 9 is rocked forwardlyitstorsion spring I the pin 29 will strike the base or a cartridge in the firing chamber of thefiiiearrn and the end of the extractor will engage the rim of the same.
  • the scar member ZI comprises a plate mounted on a pivot pin 3
  • the tooth I9 the member 2l has acam nger 33 which, during the forward closing movement .of the breech block, is arranged to be' acted upon by the peripheral face of the breech block Si, seen in Figure 4.
  • the sear member is provided with a shoulder 35 for interengagement with a safety lever:y 3T (see Fig ures 1 and 2).
  • the SQlF-member has a iaterally extending pin 39 secured thereon for engagement with one end of a torsion spring 4l which theren by serves to bias the member about its pivot 3l and urge the tooth AI! inte the groove Il in the limb of the breech block.
  • a trigger i3 which at its .opper epd carries a pivoted trip pawl d5.
  • the forward end f the. trip pawl d is Should-ered t0 engage @depending tail para@ of the Sear member 2
  • rEhe safety lever 31 is a forwardly extending member pivotally mounted at its rear. end to the action body and spring-urged downwardly into contact with a cross piny A9 carried by a downwardly extendingr lug 5I on a thumb slide 53.
  • the safety lever 31 has a sloping under-surface which is provided with two small forwardly and rearwardly spaced recessess therein adapted to be engaged by the 9.135% Dili- 4'21 W'en @he thumb slide 53 is moved rearwardly the cross pin @il lies in the rearward recess; (jas seeninfl'igure 2) so that the lever 3'!Y is spr' rged downwardly to such a position that its forward end engages with the shoulder 35 on the scar member to prevent the latter.
  • Cartridges are locatedl in a tubular magazine 51 ( Figure 2) formed in the butt of the rearm and are spring-urged forwardly into a clipper or feed tube 59 thevforward end of which is located adjacent the iiring chamber of the iirearm.
  • the feedtube 5:9 is provided with a downwardly Projecting 111gthrough Ywhich passes e pivot pin El located in oppositely disposed webs in the bottom plate l.
  • the feed tube 5,9- is acted upon by a secondY limb or the torsion spring lli in such manner as normally to maintain it in alignment with the iiring; chamber but the forward end of the tube islocated in the path of movement of the web Il of thefbreech block S.
  • depression of the trigger will thereafter cause the pawl '45 thereon to rock .the scar member about its .pivot 3
  • the Vbreech block to theA action of the spring I5 to allow the liring pin 23 to strike a cartridge and the extractor 23 to engage the case thereof.
  • the breech block Upon discharge of the rearm, the breech block will be rocked rearwardly to cocked position once more.
  • the pawl is so arranged that even if the trigger is maintained in its depressed posi@ tion the projection or.
  • a breech mechanism for 'a iirearm comprising a pivoted sector-shaped bifurcated breech block having a channel formed between the limbs thereof and an arcuate web connecting the limbs, a ring pin and cartridge extractor carried by the' breech block, and a spring-actuated scar member for holding the. breech block in a retractedposition.
  • a breech mechanism for a firearm, comprising a pivoted sectorfshaped bifurcated breech block having a notch in its periphery and a channel formed by the limbs thereof and having an arcuate web connecting the limbs, a ring pin and cartridge extractor disposed on said web and located rearwardly thereof relative to the breech chamber of the firearm, and a spring-actuated seal member cooperative with the breech block for holding the latter in a reu tracted position, said scar member comprising a plate having a projection engageable with the notch in the periphery of the breech block.
  • a breech mechanism ⁇ for a rearm comprising a pivoted sector-shaped bifurcated breech lock having a channel formed by the limbs thereof and having an arcuate web connecting the,V limbs, a firing pin and cartridge extractor carried by the breech block, a spring-actuated sear member for holding the breech block in a retracted position, a movable trigger guard, and a projection on the trigger guard for retracting the breech block.
  • a breech mechanism for a firearm comprising a pivoted sector-shaped bifurcated breech block having a notch in its periphery and ⁇ a channel formed by the limbs thereof, and having an arcuate web connecting the limbs, a firing pin and cartridge extractor carried by the breech block, a spring-actuated sear member cooperative with the breech block for holding the latter in a retracted position comprising a plate having a projection engageable in the notch in the periphery of the breech block, and trigger actuated means contacting said sear plate to move the projection thereon out of engagement with the notch in the periphery of the breech block.
  • a breech mechanism for a rearm comprising a pivoted sector-shaped bifurcated breech block having a notch in its periphery and a channel formed between the limbs thereof and having an arcuate web connecting the limbs, a ring pin and cartridge extractor carried by the breech block, a spring-actuated sear member for holding the breech block in a retracted position, comprising a plate having a projection thereon engaging in the notch in the periphery of the breech block, a trigger, means contacting with said sear plate to move the projection thereon out of engagement with said notch upon actuation of the trigger, and means comprising a safety lever movable into contact with said sear plate to prevent movement thereof upon actuation of the trigger.
  • a breech mechanism for a firearm having a. breech chamber comprising a pivoted sectorshaped bifurcated breech block having a channel formed by the limbs thereof and having an arcuate web connecting the limbs, a iiring pin and cartridge extractor carried by the breech block, and a pivotally mounted tube lying between the limbs of the breech block to receive cartridges from a magazine and operative to feed the cartridges successively to the breech chamber.
  • a breech mechanism for a firearm having a breech chamber comprising a pivoted sectorshaped bifurcated breech block having a channel formed between the limbs thereof and having an arcuate web connecting the limbs, a firing pin and cartridge extractor carried by the breech block, and a pivotally mounted cartridge feed tube lying between the limbs of the breech block, said tube being engageable by the arcuate web on retraction of the breech block and movable thereby away from the breech chamber.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
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US735560A 1945-10-24 1947-03-19 Breech mechanism for firearms Expired - Lifetime US2476905A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27994/45A GB603542A (en) 1945-10-24 1945-10-24 Improvements in or relating to firearms

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US2476905A true US2476905A (en) 1949-07-19

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US735560A Expired - Lifetime US2476905A (en) 1945-10-24 1947-03-19 Breech mechanism for firearms

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BE (1) BE471918A (en(2012))
GB (1) GB603542A (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD348094S (en) 1990-08-20 1994-06-21 Rodney Jr Frederick W Breach end of a muzzle loading gun barrel
US11421956B1 (en) 2021-02-10 2022-08-23 WHG Properties, LLC Firearm assemblies with a trigger guard magazine guide portion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD348094S (en) 1990-08-20 1994-06-21 Rodney Jr Frederick W Breach end of a muzzle loading gun barrel
US11421956B1 (en) 2021-02-10 2022-08-23 WHG Properties, LLC Firearm assemblies with a trigger guard magazine guide portion

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Publication number Publication date
BE471918A (en(2012))
GB603542A (en) 1948-06-17

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