US2704491A - Lxxk r released by inertia member - Google Patents

Lxxk r released by inertia member Download PDF

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Publication number
US2704491A
US2704491A US2704491DA US2704491A US 2704491 A US2704491 A US 2704491A US 2704491D A US2704491D A US 2704491DA US 2704491 A US2704491 A US 2704491A
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United States
Prior art keywords
inertia member
breech
bolt
locking block
receiver
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Expired - Lifetime
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English (en)
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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
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/78—Bolt buffer or recuperator means
    • F41A3/82—Coil spring buffers
    • F41A3/84—Coil spring buffers mounted within the gun stock
    • 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
    • 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
    • F41A5/10—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated having a movable inertia weight, e.g. for storing energy
    • F41A5/12—Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated having a movable inertia weight, e.g. for storing energy mounted in a gun having a fixed barrel
    • 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
    • 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
    • F41A9/61—Magazines
    • F41A9/64—Magazines for unbelted ammunition
    • F41A9/72—Tubular magazines, i.e. magazines containing the ammunition in lengthwise tandem sequence
    • 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
    • F41C7/04—Shoulder-fired smallarms, e.g. rifles, carbines, shotguns with reciprocating handgrip under the buttstock for loading or cocking

Definitions

  • the present invention relates to improvements in firearm, and more particularly to self-loading firearm with fixed barrel.
  • Another object of the invention is to provide a selfloading firearm with well balanced fixed barrel, with a shortened receiver and having the center of gravity near the handling zone.
  • Still another object of the invention is to provide a selfloading firearm with fixed barrel having two triggers and a magazine formed with two tubular containers disposed side by side, from which the cartridges may be fed by pressing either trigger so as the shooter, at the time of the discharge, by pressing one of the two triggers, determines beforehand from which container will be fed the next cartridge.
  • the cartridges contained in a container of the magazine may be also different from the cartridges contained in the other container.
  • a further object of the invention is to provide a selfloading firearm having a magazine for the cartridges, wherein an untimely feeding of the cartridge from the magazine is prevented.
  • Fig. 1 shows a general longitudinal view of the firearm
  • Fig. 2 shows a longitudinal view, partly in section, of the receiver when the firearm is ready for the discharge, the side being removed;
  • Fig. 3 shows a transverse section of the firearm taken along line III-III of Fig. 2;
  • Fig. 4 shows a longitudinal view of the receiver just after the discharge, when the inertia member has ended its forward displacement
  • Fig. 5 shows a longitudinal partial view of the receiver of the firearm when the inertia member, at the beginning of its rearward displacement, unlocks the locking block;
  • Fig. 6 shows a longitudinal view of the receiver when the inertia member has ended its rearward displacement and the ejection of the shell occurs
  • Fig. 7 shows a longitudinal partial view of the receiver at the time when the cartridge carrier raised with the cartridge and the inertia member is made free from the carrier rear tooth
  • Fig. 8 shows the retired position of the dog at the end of the recoil of breech-bolt in the event that the shooter has not withdrawn the finger from the trigger;
  • Fig. 9 is a perspective view of the trigger-plate supporting the cartridge transfer members, the dog and the safety device;
  • Fig. 10 is a partial perspective view of the safety device, one trigger and T-shaped lever for the stopping of the cartridge;
  • Figs. 11 and 12 are perspective views of the rear end of the magazine
  • Fig. 13 shows a rear view, partly in section, of the magazine
  • Figs. 14 and 15 illustrate the butt-stock and the device for the hand displacement of the inertia member.
  • the firearm (Fig. 1) includes a barrel 1, a frame or receiver 2, with a trigger-plate mounted in the underside of the receiver, a butt-stock 4 and the magazine 5 for the cartridges.
  • the barrel 1 is screwed to the receiver and it is fixed by means of a latch 9, serving inside the receiver as an abutment to the breech-bolt when in locking position.
  • the latch 9 is operable from the outside of the barrel at the left hand side.
  • On the barrel (Fig. 1) are disposed the sight 68 and a projection 69 whereon the magazine 5 is pivoted.
  • a spring ring 10, slightly undulated is between the barrel and the receiver to prevent clearance due to wear.
  • the receiver 2 extends rearwardly in a cylindrical tube 15 wherein the butt-stock 4 is mounted, provided with a plate 72, the butt-stock being fixed to the tube 15 by means of a screwed plug 70. (Figs. 14 and 15.)
  • the receiver 2 has an opening in the underside which is closed by the trigger plate 3, fixed to the receiver by means of the latch 14 and a side opening 17 which serves as ejection-opening for the shell.
  • the receiver has also a tooth 99 (Fig. 3) projecting inwardly on which the head of inertia member 8 abuts on discharge on the firearm.
  • the breechbolt 6 of small dimensions, has the firing pin 55, inclined with respect to the breech-bolt axis, the extractor 56 and the ejector 75.
  • the locking block 7 includes a cylindrical wall which serves to close the ejection opening 17 and rearward are two projections 59 and 61 extending downwardly.
  • Projection 59 is disposed along the axis of the firearm and is in the shape of a hook, which engages a tooth 68 of the inertia member 8, whereas against the projection 61 abuts the step 62 of the inertia member 8.
  • Locking block 7 has on the side wall a tooth 13 which slides in groove 12 of the receiver 2.
  • the inertia member 8 is a heavy cylindrical bar, sliding in the tube 15, and is intended to carry rearwardly the breech-bolt by engagement of its tooth 60 with the projection 59 of the locking block and to carry forwardly, in locking position, the breech-bolt 6 urging by its step 62 the projection 60 of the locking block.
  • the inertia member In its rear portion the inertia member is axially bored to receive the action-spring 18, guided by rod 71 fixed to plug 70 (Figs. 14 and 15).
  • the inertia member 8 has a fiat surface 78, which rides the 3 and prevents the inertia member its axis.
  • the head 49 of the inertia member 8 is so shaped as to engage tooth 35 of the cartridge-carrier 32, which tooth, when raised, causes the member 8 to remain in rear position keeping the breech-bolt in opening position.
  • a groove 79 along the flat surface 78 of the member 8 is provided a groove 79, wherein tooth 35 of the cartridge carrier slides during the motion of member 8.
  • the member 8 has a cavity 48, where in penetrates the head 47 of lever 44 (Figs. 14 and 15) for the hand operated opening of the breech-bolt.
  • a cavity 80 is bored in which is located the piston 64 with a strong spring 65, which plston may penetrate into the cavity 80 by an extension corresponding to the length of the slot 81 provided in piston 64. Piston 64 is secured by a key 82.
  • the device which permits hand opening of the breechbolt when the chamber is clear and it is desired to introduce a cartridge therein.
  • Such device includes a lever wall 98 of trigger plate 8 from rotation around 41 pivoted on the horizontal shaft 42.
  • Lever 41 has a projection 43 on which a lever 44 is pivoted, which has at its end a cylindrical head 47.
  • two beads 45 are applied, which penetrate in the recess 46 of the butt-stock and keep the lever against the underside of the butt-stock.
  • lever 41 By raising lever 41 it rocks on shaft 42 and carries lever 44 with it, which engage by the head 47 the cavity 48 in the inertia member 8.
  • head 47 Upon continuing to raise lever 41, head 47 carries inertia member 8 rearwardly in the cylindrical tube 15 by an extension of about 80 mm. until head 49 (Fig. 6) of member 8 engages tooth 35 of the cartridge-carrier 32, which prevents the forwardly return of member 8. At this time, head 47 is hand disengaged from cavity 48 and lever 41 may be again depressed inside the underside of buttstock 4; the breech-bolt 6 remains in opening position and one cartridge is hand introduced in the barrel.
  • Trigger plate 3 bears the members for the discharge of the cartridge, the cartridge carrier and the safety device. Trigger plate 3 is engaged in the receiver 2 by means of grooves and is locked at the rear by means of pin 14 controlled by the outer bolt 19. Trigger plate 3 supports the hammer 20 urged by spring 21, guided by rod 22. The hammer 20 has rearward a hook 83 which engages, when the spring is compressed, the tooth 84 or the tooth 85 of the bifurcate lever 23, urged by spring 67, fixed to the trigger-plate.
  • Two triggers 24 and 25 pivoted on plate 3 have a finger piece 86, a rear projection 26 for controlling sear 23 and a forward arm 27. Arms 27 of the two triggers act on beads 52 and 53 (Figs.
  • the forward portion of the plate 3 carries a latch 30 with a spring 31, which locks the magazine 5 against the barrel.
  • the rear portion of trigger plate 3 has a wall 98 extending upwardly whereon slides the flat surface 78 of the inertia member 8, preventing this latter from rotation around its axis.
  • the cartridge carrier 32 shaped as a fork pivoted in its realpart on the shaft 34 (Fig. 4) and urged upwardly by a spring 33.
  • a spring urged stop 74 made with two arms angularly disposed, and controlled both by tooth 36 and by bead 54, has a hook 91 which keeps the cartridge carrier in depressed position.
  • the carrier 32 has pivoted a spring urged tooth 35, which keeps the inertia member at the end of the movement rearwardly, when the carrier is depressed.
  • a T-shaped lever 93 is pivoted, which passing, forward, between the arms of the fork of the carrier 32 puts the transverse element of lever 93 in front of the magazine 5 beyond the forward end of the carrier.
  • the T-shaped lever is intended to prevent for a certain time the cartridge from coming out of the magazine before being permitted to ride the carrier.
  • the forward end of the T-shaped lever is depressed to permit the cartridge to ride on the carrier by means of a projection extending downwardly from the hammer 20 which presses the bracket 96 applied to the side of the T-shaped lever (Fig. when the hammer has been again hooked rearwardly by the breech-bolt 6 which has recoiled.
  • the magazine 5 for cartridges comprises two tubular containers 95 disposed side by side and may be moved away from the barrel by rocking on the projection 69 of the barrel, being urged by a spring which is kept pressed when the latch 30 of trigger plate 3 penetrates in the cavity 94 of the magazine.
  • Each tubular container 95 has a spring 51 (Fig. l) for urging out the cartridges.
  • the cartridges are retained inside the containers 95 by means of a locking and releasing lever 28, 29 which operates in different manners depending upon whether the shooter, after having pressed the trigger, withdraws his finger therefrom or keeps the trigger pressed.
  • the shooter in handling the firearm with the left hand, presses the member 90 of the safety plate 38, whereby the teeth 39 are moved away from the tails 89 of the trigger which may be operated (Fig. 10).
  • trigger 24 by means of its forward arm 27, presses bead 52 of the lever 28, which rocks thereby lowering tooth 87 which frees the first cartridge of a container which cartridge is urged rearwardly by spring 51 toward the cartridge carrier 32, but being prevented from riding thereon because it is stopped by the transverse arm of the T-shaped lever 93 (Fig. 4) which is in raised position.
  • the whole firearm recoils and therewith the breech-bolt 6 and the locking block 7 which are fixed to the barrel.
  • the inertia member due to inertia, will effect a forwardly movement by pressing the spring loaded piston 64 by an extension corresponding to the length of the slot 81 till the surface 101 abuts against the wall 96 of the receiver 2 (Fig. 4).
  • the inertia member 8 its forward part is under the locking block 7 and abuts against tooth 99 (Fig. 3) and prevents the locking block from lowering which would cause the unlocking of the breech bolt 6.
  • breech-bolt 6 by means of the extractor 56 withdraws from the chamber the shell, which, struck by the ejector 75, is ejected through the ejection opening 17, which in the meantime has been cleared owing to the recoil of the locking block 7 (Fig. 6).
  • the inertia mem ber recoils till the action spring 18 is wholly compressed and is retained in its rearmost withdrawn position by tooth 35 of the cartridge carrier.
  • the breech-bolt 6, during its recoil abuts against hammer 20, which is rocked rearwardly until its hook 83 is again engaged by tooth 84 or 85 of the sear 23.
  • the hammer 20 in returning to its rearmost position causes T-shaped lever 93 to lower thus permitting the cartridge 100 to ride the carrier 32, striking the stop tooth 36, which moving back, disengages its hook 91 from the cartridge carrier permitting the latter, by rocking on pivot 34 to raise its forward part carrying the fresh cartridge in front of the barrel (Fig. 7).
  • the raising of the carrier causes tooth 35 to be lowered, so that the inertia member 8, no further retained by said tooth (Fig. 7) may move forwardly urged by spring 18, pushing forward the locking block 7, by means of the surface 62 which abuts against the projection 61 of the locking block, and the breech-bolt which introduces the fresh cartridge in the chamber of the barrel.
  • the inertia member 8 finds the carrier empty and sliding thereon causes it to lower and to be restored in position in front of the magazine.
  • a self-loading firearm having a barrel fixed with respect to a receiver, a receiver having grooves therein, a breech-bolt arranged to slide in said grooves in said receiver, said breech-bolt being provided with a rear recess of circular cross-section, a locking block having two rear projections extending downwardly and a forward cylindrical head rockably engaged with said rear recess, said locking block, when in the upper position, being aligned with the breech-bolt and abutting with the rear end against a vertical step in the wall of the receiver to hold the breech-bolt in barrel closing position, an inertia member movable from a forward position corresponding to the closing of the breech-bolt to a rearmost position corresponding to the opening of the breech-bolt, said inertia member being arranged to engage one of said projections to rock downward the locking block with respect to the breech-bolt and to withdraw the locking block and the breech-bolt therewith and
  • a receiver having grooves, 21 barrel fixed to said receiver, a breech-bolt provided with ribs sliding in said grooves of said receiver, said breech-bolt having a rear recess having a circular cross section, a locking block having a forward cylindrical head engaging said recess and arranged to rock in a vertical plane from an upper to a lower position and back, two rear projections on said locking block extending downwardly, said locking block, when in upper position, being in alignment with said breech-bolt and abutting at the rear end against a vertical step in the wall of the receiver to hold the breech-bolt in a barrel closing position, an inertia member arranged to engage said projections of the locking block for withdrawing the locking block and the breech-bolt therewith and for restoring the locking block in the upper position and the breech-bolt in barrel closing position, the inertia member with its forward end, when the breech-bolt is in barrel closing position, being
  • a self-loading firearm having a receiver and a barrel fixed thereto, a breech-bolt, a locking block engaged with the breech-bolt, the locking block being arranged to rock with respect to the breech-bolt to assume two different positions in a vertical plane, an upper position wherein the locking block is aligned with the breech bolt to keep the latter in a barrel closing position by abutting against a vertical step in the wall of the receiver, a lower position wherein the locking block is downwardly rocked with respect to the breech-bolt, an inertia member to engage the locking block both during the forward and the rearward movement of the inertia member, said inertia member having a vertical wall and having a cavity bored in said vertical wall, a projection fixed to the receiver facing said vertical wall, a spring piston located in said cavity and projecting therefrom to distance said vertical wall from said projection and arranged to allow the vertical wall to abut against said projection on the discharge of the firearm through compression of the

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Toys (AREA)
US2704491D 1950-03-16 Lxxk r released by inertia member Expired - Lifetime US2704491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT689427X 1950-03-16

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US2704491A true US2704491A (en) 1955-03-22

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US (1) US2704491A (US20080094685A1-20080424-C00004.png)
BE (1) BE501938A (US20080094685A1-20080424-C00004.png)
DE (1) DE869017C (US20080094685A1-20080424-C00004.png)
FR (1) FR1038611A (US20080094685A1-20080424-C00004.png)
GB (1) GB689427A (US20080094685A1-20080424-C00004.png)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960011A (en) * 1956-05-07 1960-11-15 Bretton Rene Jean Georges Automatic firearm having inertia released breech mechanism
US5983549A (en) * 1998-07-24 1999-11-16 O. F. Mossberg & Sons, Inc. Inertial cycling system for firearms
US9534861B1 (en) 2010-11-19 2017-01-03 Kel-Tec Cnc Industries, Inc. Tubular magazine firearm with sheet metal receiver

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1147780A (en) * 1912-10-21 1915-07-27 Hugo Borchardt Toggel breech mechanism for automatic firearms.
GB540879A (en) * 1938-12-03 1941-11-04 Goffredo Prola Improvements in automatic sporting guns
US2333677A (en) * 1940-05-13 1943-11-09 Western Cartridge Co Self-loading firearm
US2418946A (en) * 1942-08-15 1947-04-15 Remington Arms Co Inc Breech bolt lock for firearms
US2466902A (en) * 1946-11-21 1949-04-12 Olin Ind Inc Inertia operating member for automatic firearms
US2480074A (en) * 1944-10-28 1949-08-23 J M & M S Browning Company Cartridge transfer mechanism for magazine firearms
US2506982A (en) * 1947-03-10 1950-05-09 Olin Ind Inc Carrier spring for magazine type firearms
US2626475A (en) * 1948-04-13 1953-01-27 Val A Browning Cartridge carrier for repeating shotguns
US2634536A (en) * 1950-11-08 1953-04-14 Olin Ind Inc Cartridge detent mechanism for self-loading firearms

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1147780A (en) * 1912-10-21 1915-07-27 Hugo Borchardt Toggel breech mechanism for automatic firearms.
GB540879A (en) * 1938-12-03 1941-11-04 Goffredo Prola Improvements in automatic sporting guns
US2333677A (en) * 1940-05-13 1943-11-09 Western Cartridge Co Self-loading firearm
US2418946A (en) * 1942-08-15 1947-04-15 Remington Arms Co Inc Breech bolt lock for firearms
US2480074A (en) * 1944-10-28 1949-08-23 J M & M S Browning Company Cartridge transfer mechanism for magazine firearms
US2466902A (en) * 1946-11-21 1949-04-12 Olin Ind Inc Inertia operating member for automatic firearms
US2506982A (en) * 1947-03-10 1950-05-09 Olin Ind Inc Carrier spring for magazine type firearms
US2626475A (en) * 1948-04-13 1953-01-27 Val A Browning Cartridge carrier for repeating shotguns
US2634536A (en) * 1950-11-08 1953-04-14 Olin Ind Inc Cartridge detent mechanism for self-loading firearms

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960011A (en) * 1956-05-07 1960-11-15 Bretton Rene Jean Georges Automatic firearm having inertia released breech mechanism
US5983549A (en) * 1998-07-24 1999-11-16 O. F. Mossberg & Sons, Inc. Inertial cycling system for firearms
US9534861B1 (en) 2010-11-19 2017-01-03 Kel-Tec Cnc Industries, Inc. Tubular magazine firearm with sheet metal receiver

Also Published As

Publication number Publication date
GB689427A (en) 1953-03-25
FR1038611A (fr) 1953-09-30
BE501938A (US20080094685A1-20080424-C00004.png)
DE869017C (de) 1953-03-02

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