US2499090A - Inertia operated pivoted bolt lock - Google Patents

Inertia operated pivoted bolt lock Download PDF

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Publication number
US2499090A
US2499090A US555949A US55594944A US2499090A US 2499090 A US2499090 A US 2499090A US 555949 A US555949 A US 555949A US 55594944 A US55594944 A US 55594944A US 2499090 A US2499090 A US 2499090A
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United States
Prior art keywords
barrel
recoil
breech block
movement
locking
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
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US555949A
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English (en)
Inventor
Val A Browning
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J M & M S Browning Co
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J M & M S Browning Co
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Publication date
Priority to BE466929D priority Critical patent/BE466929A/xx
Application filed by J M & M S Browning Co filed Critical J M & M S Browning Co
Priority to US555949A priority patent/US2499090A/en
Priority to US560743A priority patent/US2474180A/en
Application granted granted Critical
Publication of US2499090A publication Critical patent/US2499090A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • F41A19/43—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • F41A19/44—Sear arrangements therefor
    • 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
    • F41A35/00—Accessories or details not otherwise provided for
    • F41A35/02—Dust- or weather-protection caps or covers
    • 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
    • F41A9/18—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 under the barrel

Definitions

  • This invention relates to improvements in firearms, and particularly to self-loading, recoil-opf erated firearms.
  • a further aim of the invention is to provide in a firearm of this type a new and ⁇ improved'arrangement for transferring the successive cartridges from the magazine to the firing chamber and, particularly, to provide an arrangement wherein the magazine may be loaded at all times when the breech block is forward in closing position without the necessity of pushing a manual button or other instrumentality of the type usually employed on firearms of this character, and wherein the carrier is simplified and its operation is improved.
  • Figure 1 is a side elevational View of an automatic, recoil-operated firearm embodying the present invention
  • Fig. 2 is an enlarged sectional view taken generally longitudinally and vertically through the firearm, with parts of the operating mechanism shown in side elevation;
  • Fig. 3 is a like sectional view, of a still greater enlargement, showing the operating mechanism of the rearm illustrated in Fig. 1 when the same is in firing position, the rear and forward ends of the firearm being omitted;
  • Fig. 4 is a view similar to Fig. 3, in which the parts are in a position which they occupy during an intermediate stage in the recoil stroke, and more particularly illustrating the barrel in the position which it occupies toward the end of its recoil stroke and the breech block in a position where it is unlocked from the barrel and is continuing its recoil movement;
  • Fig. 5 is a View similar to Fig. 3 but looking at the other side of the firearm and showing the relative positions of the parts when the breech block has almost reached the end of its recoil movement and at which time the carrier is in depressed position, as shown, to receive anew cartridge from the magazine;
  • Fig. 6 is a View similar to Fig. 5 but showing the carrier latched in depressed position and the breech block locked in retracted position, a condition which takes place when the firearm has been red and the magazine is empty, or when the breech block is manually moved to its retracted position while there are no cartridges in the magazine;
  • Fig. 7 is a View similar to Fig. 3 but shows the positions which the parts assume while the breech block is moving rearwardly from the position shown in Fig. 5 to the extreme end of its recoil stroke;
  • Fig. 8 is a View similar to Fig. 7 illustrating the relative positions of the parts when the breech block is approaching the forward end of its return movement and just prior to the locking of the barrel 'and breech block;
  • Fig. yluis an elevational cross sectional view taken on the line lD-I of Fig. 3 and looking in v the direction of the arrows;
  • Fig. l1 isan elevational cross sectional view taken on the line li--ll of Fig. 3 and looking in thedirection of the arrows;
  • Fig. 12 is a perspective view showing the construction of the link
  • Fig. 1B is a side View of the closure plate Il', ⁇ the right hand extractor 58 and the operating ⁇ handle i9 being shown in phantom;
  • Fig. 14 is a top edge view of the closure plate i y and a portion of the breech block.
  • My improved firearm has a frame here shown rin the form of a receiver, a barrel provided with a barrel extension mountedifor reoiprocation in the receiver, a breech block provided with means (such as va locking block) for locking the breech blockto the barrel extension, an inertia instru.-
  • frame orreceiver il and a stock 12.
  • a stock 12 is of usual construction and is provided at its rear end with a barrel extension i3 and a cartridge chamber !4.
  • the 'barrel extension extends into an opening 3B in the forward end of the receiver.
  • the barrel is further equipped with a f barrelfguidering i5 which isslidably'mounted on the cylindrical magazine IB.
  • rlhe receiver or frame y Il may be of any suitable construction automatically disengage the latter from the barhandle I9.
  • the magazine I6 is permanently explosion forces ⁇ the barrel, the breech block in locked relation to the barrel extension, and the ⁇ inertia instrumentality rearwardlywith an accelerating movement through a very short distance and then the parts, due to the action of i y the recoil spring, undergo a decelerating recoil i movement during which time the breech block is automatically unlocked from the barrel extension due to the momentum of the inertia instrumentality.
  • the recoil resisting means will yeldingly stop rearward movement of the barrel in space (that is, Without the barrel Striking any ixed stops or abutments), and the recoil spring will then advance the barrel to its ring position while the breech block and the inertia block continue their recoil movement.
  • An action spring then returns the breech block and inertia member to their ⁇ forward positions where the breech block is automatically locked to the barrel extension.
  • any standard shell may be employed in the firearm as variations in the explosive intensity of shells within the standard range are automatically provided for, and no manual Aadjustment of the rearm is necessary.
  • the rear of the receiver is preferably equipped with a threaded extension 2l which serves as a mounting for the inertia member tube 22, 'which fits within the bore 23 of the stock l2.
  • the inertia member tube is closed at its rear end by a suitable plug 2e or the like, which is provided with an internally threaded opening 25 for accommodating the stool;v :bolt 26, preferably in the manner shown in Fig. 2.
  • the stock bolt 26 extends through a smaller opening 21 in the stock and. has an enlarged head 28 abutting the inner end of a. larger opening 29 in the stock. Through the instrumentality of the stock bolt the stock is held in proper position on the receiver.
  • a recoil spring 3D is provided, together with one or more friction rings 32-32 which serve to resist the recoil movement of the barrel and to restore the barrel to firing position following recoil.
  • the friction rings 32-32 may be of any suitable construction and are here illustrated as comprising split collars 33--33 surrounded by suitable retainer springs 315-34.
  • the recoil spring 38 and the friction rings 32--32 are of such construction that they collectively provide suiicient resistance to the recoil movement of the barrel to stop its rear movement in space within the receiver, that is without the use of abutments or the like against which the barrel may strike.
  • a suitable magazine spring 35 is mounted for advancing the shells in the magazine rearwardly in the con-l ventional manner for automatic loading of the firearm.
  • the forward end of the magazine tube i6 is threaded as at 36 for accommodating the magazine cap 31 which, with the usual fore-end 38, holds the barrel in mounted position with respect to the receiver.
  • the barrel an intermediate point in the height thereof, a pair of opposed grooves 4
  • , formed on the lower forward portion of the barrel extension, are slidably mounted in the grooves 411-40.
  • the breech block I 44 is provided with laterally extending flanges 45-45 which are likewise slidably mounted in I the grooves 40--40 in the receiver.
  • the breech and lug in the present illustration is located outside of the body of the locking block and in such fu; position as to give the desired movement of the locking block relative to the breech block.
  • the forward portion of the breech block is provided with a central opening 49 for accommodating the iiring pin 50.
  • the opening 49' is en- I larged, as at 5
  • the intermediate portion of the firing pin is accommodated in the central slot 54 in the locking block 41, and its rear end is slidably mounted in a suitable opening therefor in the retaining plate 55.
  • the breech block is further provided with suitable extractors 56-56 on the opposite sides thereof, of conventional construction.
  • the barrel extension 3 has a longitudinally extending groove therein in position to accommodate the extractor 56 located on the adjacent side of the breech block.
  • which is of conventional construction and which serves in cooperation with the extractors to eject the spent cartridge.
  • the barrel extension is provided with the locking opening
  • 32 has its rearward lock-engaging face
  • the latch extends toward the rear of the firearm and has a locking end portion 63 adapted to engage the shoulder 64 of the locking block when the locking block is moved to unlocked position (see Figure).
  • the lowerrear corner 0f thelockingblock is pivoted at 65 to a link 66 which extends rearwardly and terminates in a suitable pivot member, such as 61, for pivotal connection to the inertia member 68.
  • a suitable pivot member such as 61
  • the particular pivot connection shown permits assembly and disassembly by merely sliding the link 66 laterally relative to the inertia member 68.
  • the inertia member 68 is slidably mounted in the inertia member tube 22 and also has abutting engagement with the action spring 69. The opposite end of the action spring is seated against the plug 24 which closes the rear end of the inertia member tube 22.
  • the inertia member 68 is further equipped with the rearwardly projecting extension 98 which has sufcient length to abut the plug 24 in the extreme rearward position of the inertia member to form an ultimate stop for the recoil movement of the inertia member and breech block.
  • 50 of felt, ber, rubber, or other suitable material is preferably placed on top of the plug 24.
  • the firing mechanism here illustrated comprises a trigger plate 10 having a central slot 12 therein and equipped with a suitable trigger guard 1
  • the trigger 13 is pivoted on the pin 14 and has an upwardly extending end 15 pivoted at 16 to the counterbalancing link 11.
  • the other end of the link 11 is pivoted as at 18 to the upper arm of the sear 19 which is mounted for oscillatory movement around the axis of a pin 80.
  • the pin extends through an opening in the sear and projects on opposite sides thereof and is accommodated in the semi-circular bearings formed in the extensions 8
  • the lower end of the Sear extends downwardly and presents a portion 82 in spaced and opposed relationship to a portion 83 of the trigger. These portions 82 and 83, respectively, are provided with recesses, as shown in Fig. 3, in which the opposite ends of a compression coil spring 64 are mounted.
  • the lower arm of the sear is provided with a hammer-engaging tooth 85 which coacts with the hammer notch 86 on the hammer 81 for holding the hammer in cocked position.
  • the hammer is pivotally mounted on a pin 88 carried by the lugs 89--89 extending upwardly from the forward portion of the trigger plate.
  • the upper arm of the sear is provided with a tooth or hook 96 for engaging a cooperating tooth 9
  • a pin 92 Extending through the hammer adjacent its pivot is a pin 92 equipped with parallel diametrically disposed holes 93 which accommodate the forward ends of the main spring guide rods 94-94. These rods are each provided with an integral flange 95 adjacent their forward ends to limit their forward movement with respect to the pin 92 and to provide abutments for the forward ends of the main springs 96-96.
  • the pin 80 which extends through the intermediate portion of the sear 19, is likewise provided with parallel diametrically extending holes 91-91 which slidably accommodate the rear ends of the main spring guide rods Sli-94.
  • the trigger plate may be attached to the re- ⁇ ceiver by pins
  • a carrier portion of the receiver and preferably comprises a pair of spaced arms il--ll pivoted on the carrier pin H32 which has its opposite ends mounted in the spaced side walls of the receiver.
  • a pair of looking pawls M35- m5 which are spaced apart to provide a central space for accommodating the carrier-depressing lever
  • the locking pawls iand the carrierdepressing lever i are all pivotally mounted on the pin Hifi, and the locking pawls are held in operative positions by means ci the ends lOl-
  • the ends itl extend into the slots H19 on the outer lateral faces of the pawls, whereby through the depressing action of the springs the pawls are held in operative position and at the same time a downward pressure is exerted on the pin lila.
  • the carrier-depressing lever ii has its upper end extended suiiciently to occupy the space constituting the central slot im in the link 55, and for engagement, at the proper moment, with the shoulder or cam face located at the forward end of the slot i le.
  • the lower end of the carrier-depressing lever is formed to constitute a cam I il! which in certain positions is adapted to engage and bear upon the upper lace H3 of the bearing block ill-l slidably mounted in a groove H5 in the upper face of the trigger plate. Forward movement of the bearing block lill is limited by means of pin H6 and the block is normally urged in contact with the pin by means of the compression spring Ill.
  • the inner face ol one wall of the receiver is provided with a recess i2! in which is pivotally mounted the carrier lock and cartridge stop member
  • This member may be constructed in the mannerv illustrated in the drawings, and the pivot
  • the outer face of the member H22 is provided with a recess
  • 22 constitutes.
  • a stop for the cartridges contained in the lmagazine-mid it! is also mounted in the lowerthe'rear end ofthe member v
  • the arrangement, relation, and movements of the carrier and the carrier lock and cartridge stop member 22 are such that when, and only when, the carrier is in the depressed or cartridge receiving position shown in Figs. 5, 6 and 9 and the magazine is empty of cartridges, the. rear of the member
  • the arm thereof lies in the path of inward movement of the rear end of the member
  • 22 is resilient and yieldable whereby y it is free to move towards the wall of thereceiver during the insertion of cartridges into the magazine and to spring back to cartridge stop position after each cartridge has been so inserted.
  • 33 of the locking block and barrel extension I3, respectively, is such as to bring about a wedging action tending to press the breech block against the head of the cartridge in the ring chamber and, in addition, to take up wear which might develop between the parts and which otherwise would cause'undesirable head space.
  • the hammer 8'! is released from the sear 'I8 so that the hammer is free to swing (under the inuence of the main springs 96) from the full line position to the dotted line position shown in Fig. 3 thus striking the ring pin 50 and causing explosion of the shell within the ring chamber. ⁇
  • the power gases generated act against the forward.
  • the recoil movement of the barrel causes a corresponding rearward movement of the barrel guide ring i as well as the friction rings 32 and also a compression of the recoil spring 30.
  • the resistance of the recoil resistance means, including the spring and the friction rings, is such, as previously indicated, that the recoil movement of the barrel will be rapidly decelerated after it has reached its highest recoil velocity and rearward movement of the barrel is yieldingly terminated in space at a variable point depending upon the character and intensity of the charge and then the recoil spring will return the barrel to its forward or normal position.
  • the breech block being connected to the barrel, tends to decelerate therewith while the inertia member tends to continue at its then attained velocity so that the inertia member will exert a rearward pull on the locking block and draw it downwardly out of locking engagement withthe barrel extension.
  • Unlocking of the locking block from the barrel starts as soon as the recoil movement of the barrel begins to decelerate, and the unlocking is entirely effected before the barrel has reached its rearmost position.
  • 34 slide on one another so that the disengagement takes place gradually.
  • the resistance of the recoil resistance means is of such magnitude as to progressively retard the recoil movement of the barrel after it has reached its highest velocity and then yieldingly bring the barrel to rest
  • the inertia instrumentality is of such mass that its momentum, during the decelerating movement of the barrel, is sufficient to unlock the locking block from the barrel extension and, while the point at which the unlocking action takes place will vary somewhat dependingupon the intensity of the charge, the relation of the operating parts is such that such unlocking cannot occur until after deceleration of the barrel starts whereby the unlocking of the breech block from the barrel occurs only at a time when it is entirely safe to unlock.
  • the breech block, link, and inertia member continue their movement to the rear under the influence of their own momentum and against the action of the action spring. Such recoil movement of the breech block will be terminated when the extension 98 of the inertia member engages the cushioning disk
  • the forward end of the carrier lll is in an elevated position so that cartridges may be inserted in the magazine.
  • 03 resiliently maintain the forward portion of the carrier up against the bottom of the breech block.
  • 22 bears against the outside face of the right hand arm
  • the member 122 will lock the carrier in the depressed position shown in Fig. 6.
  • the rearmost cartridge therein as soon as the carrier is moved to depressed position, will be snapped back onto the carrier by the magazine spring 35, and the head of this cartridge will bear against the rear portion of the member 122 thereby camming the member 22 to the full line position shown in Fig. 9, so that the carrier is free to be raised by the springs 108.
  • the carrier is cammed downwardly by the breech block from the full elevated position in Fig. 7 to the intermediate position shown in Fig. 3. Also, as the breech block is approaching its normal forward position, the shoulder provided by the rear end of the slot 1111 in the link 65 will engage the upper endof the carrier-depressing lever me and move the same forwardly and thereby swing the extension 112 to the position shown in Fig. 8. During such movement of the cam extension, it
  • the breech block will be automatically locked in its recoiled position as shown in Fig. 6. ln this position of the parts, the member 122 locks the carrier in depressed position and the locking pawls carried on the pin Ill at the rear end of the carrier are disposed in a position where they engage the shoulder 160 on the underside and adjacent the forward end of the link G6. The locking pawls engage in the notch Hit) upon initial forward movement of the breech block and the link. When it is desired to close the firearm.
  • the action spring acting through the link 66 and the pawls
  • the barrel has a relatively short recoil stroke and this, together with the relatively short breech block, permits the use of a receiver of minimum length with a consequent reduction in size and weiglitof the firearm. rThis reduction in length also permits the upper rear portion of the receiver to be rounded off to give a new streamlined appearance to the firearm.
  • the breech block is not of suncient length to provide a complete closure for the ejection opening 1T. In order that the ejection opening may be closed when the breech block is in forward position, a closure plate 1'10 is slidably mounted on the breech block. As shown in Figs.
  • the breech block in its right hand side face, 'has a longitudinally extending dove-tailed groove 168 in which is slidably mounted a correspondingly shaped rib lll provided on the closure plate.
  • the groove is open at its rear end so that the rib may be inserted thereinto.
  • the groove 168 has a shoulder 16S at its forward end so as to limit forward movement of the plate with respect to the breech block.
  • the forward end 112 of the plate i'l is bent inwardly so as to engage the forward end of the breech block and thereby limit ⁇ the extentto which the plate may move rearwardly with respect to the breech block.
  • the plate is made of thin spring metal so that this forwardr end may be sprung outwardly a sunlcient distance to permit the rib 1'11 to be slippedy into the groove 161% and the plate moved forwardly f until its end H2 snaps over the forward end of the breech block.
  • the plate is of sufficient length to provide a full length closure for the ejection opening and, at the same time, by virtue of its sliding relationship to the breech block, it may move forwardly and rearwardly by engagement with ythe receiver and the barrel extension, respectively, during the recoil and return movements of the breech block.
  • a recoil operated firearm of the character described, a receiver, a barrel carried by and mounted for reciprocation relative to said receiver, a breech block carried by the receiver for reciprocation, locking means carried by the breeech block for locking the breech block in operative relation to the barrel, recoil resistance means for progressively retarding the recoil movement of the barrel and yieldingly stopping recoil movement of the barrel in space and then restoring the barrel to its firing position during the interval when said breech block is undergoing its nal recoil movement, and an inertia instrumentality associated with the locking means and effective solely by its inertia to completely release the breech block from the barrel with a continuous action during the recoil movement of the latter and before the barrel reaches the rear end of its recoil stroke.
  • said breech block, locking 13 means, and inertia means being capable of continuing the recoil stroke after the barrel and breech block have been unlocked and while the barrel is being restored to its ring position.
  • a receiver In a recoil operated iirearm of the character described, a receiver, a barrel carriedby and mounted for reciprocation relative to said receiver, a breech block carried by' the receiver for reciprocation, locking means carried by the breech block for locking the breech block in operative relation to the barrel, recoil resistance means for progressively retarding the recoil movement of the barrel and yieldingly stopping recoil movement of the barrel in space and then restoring the barrel to its ring position during the interval when said breech block is undergoing its iinal recoil movement, an inertia instrumentality associated with the locking means for completely releasing the breech block from the barrel with a continuous uninterrupted movement during the recoil movement of the latter and before the barrel reaches the rear end of its recoil stroke, said breech block, locking means, and inertia means being capable of continuing the recoil stroke after the barrel and breech block have been unlocked and while the barrel is being restored to its iring position, and means for restoring said
  • a receiver In a recoil operated iirearm of the character described, a receiver, a barrel carried by the receiver for reciprocation, a breech block mounted for reciprocation in the receiver, locking means carried by the breech block for locking said breech block in cooperative relationship with the barrel, recoil resistance means comprising a spring for progressively retarding the recoil movement of the barrel and yieldingly bringing the barrel to rest in space and then restoring the barrel forwardly to ring position, an inertia instrumentality connected with the locking means and operative solely by inertia to completely unlock the breech block from the barrel with a continuous uninterrupted action after the barrel has reached its highest rearward velocity and during the decelerating recoil movement of the barrel, and an action spring behind said inertia instrumentality and normally urging the same forwardly and urging said breech block into locking engagement with the barrel when the latter is in ring position, said inertia instrumentality having such mass that it assists in maintaining the barrel and breech block in locked
  • a recoil operated firearm of the character described, a receiver, a barrel carried by the receiver and mounted for reciprocating movement relative thereto, a breech block carried by the receiver and mounted for reciprocation relative thereto, locking means carried by and movable relative to the breech block for locking the same to the barrel, recoil resistance means for retarding the recoil movement of the barrel and yieldingly terminating the recoil movement thereof in space and then restoring said barrel to its firing position during the interval when the breech block is undergoing its nal recoil movement, a
  • a receiver In a recoil operated rearm of the character described, a receiver, a barrel carried by the receiver and mounted for reciprocation relative thereto, a breech block mounted for reciprocation in the receiver, locking means carried by and movable relative to the breech block, interengaging shoulders on the locking ⁇ means and barrel for locking said breech block in operative relation with the barrel, recoil resistance means comprising a spring for progressively retarding the recoil movement of the barrel and yieldingly bringing the barrel to rest in space and then restoring the barrel forwardly to firing position during the interval when the breech block is undergoing its nal recoil movement, and an inertia instrumentality connected with said locking means and operative by its inertia to completely unlock the breech block from the barrel after the barrel has reached its highest rearward velocity, said interengaging shoulders being so arranged that during the unlocking operation the breech block may move rearwardly with respect to the barrel.
  • a receiver a barrel having a barrel extension mounted for reciprocation in the receiver, a breech block carried by the receiver and mounted for reciprocation therein, a generally forwardly facing locking shoulder on said barrel extension, a locking member carried by said breech block for radial movement relative thereto and having a generally rearwardly facing shoulder arranged to engage with said first-mentioned shoulder when the breech block is locked to the barrel extension, recoil resistance means for retarding recoil movement of the barrel and yieldingly terminating the recoil movement thereof in space and then restoring said barrel to its ring position during the interval when said breech block is undergoing its iinal recoil movement, and an inertia instrumentality associated with the locking member for moving continuously the same to completely unlocked position during the recoil movement of the barrel, said shoulders being inclined rearwardly of the rearm whereby during the operation of unlocking the breech block from the barrel extension, the former will move rearwardly with respect to

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US555949A 1944-09-27 1944-09-27 Inertia operated pivoted bolt lock Expired - Lifetime US2499090A (en)

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BE466929D BE466929A (de) 1944-09-27
US555949A US2499090A (en) 1944-09-27 1944-09-27 Inertia operated pivoted bolt lock
US560743A US2474180A (en) 1944-09-27 1944-10-28 Firing mechanism

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US555949A US2499090A (en) 1944-09-27 1944-09-27 Inertia operated pivoted bolt lock

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570772A (en) * 1949-03-03 1951-10-09 Remington Arms Co Inc Recoil operated firearm with pivoted bolt lock
US2714334A (en) * 1949-02-11 1955-08-02 Earle M Harvey Breech bolt lock for automatic firearms
US2960011A (en) * 1956-05-07 1960-11-15 Bretton Rene Jean Georges Automatic firearm having inertia released breech mechanism
US4166409A (en) * 1977-09-06 1979-09-04 Fabrique Nationale Herstal En Abrege Fn Sporting weapon
US4516466A (en) * 1981-05-07 1985-05-14 Weatherby, Inc. Mechanism providing positive safety with bolt locked
US6550173B2 (en) * 2000-07-14 2003-04-22 Fabram S.P.A. Fabbrica Bresciana Armi Semiautomatic rifle with inertial operation
US20120240760A1 (en) * 2011-02-11 2012-09-27 Jorge Pizano Firearm having an articulated bolt train with transversally displacing firing mechanism, delay blowback breech opening, and recoil damper
WO2018087319A1 (en) * 2016-11-10 2018-05-17 Browning International S.A. Resetting magazine cut-off for firearms

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US797420A (en) * 1904-10-15 1905-08-15 Henry B Febiger Firearm.
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US1852411A (en) * 1931-06-24 1932-04-05 Harry H O Connell Automatic shotgun
US2090340A (en) * 1933-05-03 1937-08-17 J M & M S Browning Company Repeating firearm
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US758318A (en) * 1903-11-13 1904-04-26 Winchester Repeating Arms Co Automatic firearm.
US797420A (en) * 1904-10-15 1905-08-15 Henry B Febiger Firearm.
US798512A (en) * 1905-01-19 1905-08-29 Winchester Repeating Arms Co Pivotal cartridge-carrier for bottom-loading guns.
US983762A (en) * 1910-11-10 1911-02-07 Wilson E Post Lock mechanism for firearms.
US1043670A (en) * 1910-12-07 1912-11-05 Rheinische Metallw & Maschf Breech-block mechanism for firearms or guns.
US1043717A (en) * 1911-08-26 1912-11-05 J Pesek Autogun attachment.
US1852411A (en) * 1931-06-24 1932-04-05 Harry H O Connell Automatic shotgun
US2090340A (en) * 1933-05-03 1937-08-17 J M & M S Browning Company Repeating firearm
US2409733A (en) * 1945-07-18 1946-10-22 J M & M S Browning Company Repeating firearm

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714334A (en) * 1949-02-11 1955-08-02 Earle M Harvey Breech bolt lock for automatic firearms
US2570772A (en) * 1949-03-03 1951-10-09 Remington Arms Co Inc Recoil operated firearm with pivoted bolt lock
US2960011A (en) * 1956-05-07 1960-11-15 Bretton Rene Jean Georges Automatic firearm having inertia released breech mechanism
US4166409A (en) * 1977-09-06 1979-09-04 Fabrique Nationale Herstal En Abrege Fn Sporting weapon
US4516466A (en) * 1981-05-07 1985-05-14 Weatherby, Inc. Mechanism providing positive safety with bolt locked
US6550173B2 (en) * 2000-07-14 2003-04-22 Fabram S.P.A. Fabbrica Bresciana Armi Semiautomatic rifle with inertial operation
US20120240760A1 (en) * 2011-02-11 2012-09-27 Jorge Pizano Firearm having an articulated bolt train with transversally displacing firing mechanism, delay blowback breech opening, and recoil damper
US9217614B2 (en) * 2011-02-11 2015-12-22 Jorge Pizano Firearm having an articulated bolt train with transversally displacing firing mechanism, delay blowback breech opening, and recoil damper
WO2018087319A1 (en) * 2016-11-10 2018-05-17 Browning International S.A. Resetting magazine cut-off for firearms

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