US3326085A - Automatic feed mechanism for a gun - Google Patents

Automatic feed mechanism for a gun Download PDF

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Publication number
US3326085A
US3326085A US434572A US43457265A US3326085A US 3326085 A US3326085 A US 3326085A US 434572 A US434572 A US 434572A US 43457265 A US43457265 A US 43457265A US 3326085 A US3326085 A US 3326085A
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US
United States
Prior art keywords
gun
cradle
breechblock
respect
feed 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
US434572A
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English (en)
Inventor
Maillard Bernard
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.)
Brevets Aero Mecaniques SA
Original Assignee
Brevets Aero Mecaniques SA
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.)
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Publication date
Application filed by Brevets Aero Mecaniques SA filed Critical Brevets Aero Mecaniques SA
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Publication of US3326085A publication Critical patent/US3326085A/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
    • 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
    • F41A9/29—Feeding of belted ammunition
    • F41A9/34—Feeding of belted ammunition from magazines
    • 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
    • F41A9/49—Internally-powered drives, i.e. operated by propellant charge energy, e.g. couplings, clutches, energy accumulators
    • 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
    • F41A9/50—External power or control systems
    • F41A9/51—Boosters, i.e. externally-powered motors

Definitions

  • the present invention relates to guns, and in particular automatic guns, of a caliber ranging preferably from 20 to 50 mm. and to which ammunition is fed through a mechanism automatically actuated by the gun itself.
  • the invention is more especially, but not exclusively, concerned with guns where the ammunition is carried by a belt actuated by a belt feed mechanism.
  • the chief object of the present invention is to provide a gun of this type which is better adapted than those existing up to the present time to meet the requirements of practice, in particular concerning the safety of operation of the feed mechanism.
  • the invention is concerned with guns including a movable breechblock having a reciprocating movement, and a feed device actuated by energy supplied along an energy transmission path from a resilient energy accumulator periodically receiving energy from a movable portion of the gun other than the breechblock thereof but having a reciprocating movement in synchronism with that of said breechblock, which movable portion may be the whole of the gun when the latter is mounted to recoil, against the action of a buffer system, on a stationary cradle supporting the gun feed device.
  • the movable breechblock of the gun is operatively connected in a permanent and continuous fashion with the movable parts of the feed mechanism to be actuated, this connection being effected through a positive transmission mechanism capable of positively piloting said movable parts in respect to the movements of said breechblock, that is to say through a transmission mechanism capable of constantly controlling the instantaneous positions of said movable parts in accordance with the instantaneous position of the movable breechblock of the gun.
  • FIG. 1 is a diagrammatic longitudinal view illustrating the operation of the feed mechanism of a movable breechblock automatic gun
  • FIG. 2 is an end view of some parts illustrated by the diagram of FIG. 1, certain of said parts being shown in a position rotated at 90 about an axis perpendicular to the plane of the drawings, for the sake of clarity;
  • FIG. 3 is a diagram illustrating the operation of the gun
  • Automatic gun I is adapted to recoil with respect to a cradle 200, with the interposition between them of a buffer spring 201.
  • Gun 1 having a gun barrel rigidly attached thereto comprises a breechblock 34 having a reciprocating longitudinal movement.
  • the ammunition feed device, carried by cradle 200, is adapted to be actuated automatically by the gun.
  • Said feed mechanism comprises a sliding member 143 having a reciprocating transverse movement and provided with pawls 143 adapted to catch the ammunition belt and to move it forward one step for every active stroke of said sliding member 143.
  • the strokes of sliding member 143 in the opposed direction produce no displacement of the ammunition belt.
  • the main driving force causing active strokes of sliding member 143 is produced by a resilient energy accumulator carried by cradle 200 and periodically energized, at the rate of firing, by the recoil of gun 1 with respect to its cradle 200.
  • the sliding member 143 of the feed mechanism is operatively connected with the breechblock 34 of the gun through positive transmission means capable of ensuring a piloting or regulation of the movement of sliding member 143 in response to movement of breechblock 34, that is to say a transmission mechanism such that to every position of breechblock 34 there corresponds a well determined position of sliding member 143.
  • the instantaneous position of sliding member 143 is constantly determined by the instantaneous position of breechblock 34 according to a predetermined law depending upon the characteristics of said transmission mechanism.
  • the resilient energy accumulator is made as follows:
  • a transverse fork 143 there is provided, on the side of sliding member 143, a transverse fork 143,, subjected to the action of a compression spring 202 urging said sliding member 143 in the direction of its active strokes.
  • Said spring 202 bears at one end upon an abutment 203 with trunnions 204 engaged in notches formed in the arms of said fork 143 The other end of spring 202 bears against an abutment 205 slidable upon a rod 207 rigid with abutment 203 and acting as guide for said spring 202.
  • an oscillating lever 208 pivoting about a pin 2'09 rigid with the gun cradle 200.
  • One of the arms of this lever 208 is in the form of a fork bearing against trunnions 206 carried by sliding abutment 205.
  • the other end of said lever 208 carries, journalled thereto, a roller 210 opposite which there is provided a roller 211 journalled about an axis fixed with respect to the cradle 200 of the gun.
  • such means include an arm- 208 of lever 208 which comes into a waiting position, when lever 208 has been given its maximum rotation, where it is maintained by a retractable holding finger 213 carried by cradle 200 and urged toward projecting position by a spring 214, said 3 waiting position of arm 208, being shown in dotted lines in FIG. 1.
  • Holding finger 213 is provided with a lateral projection 213 disposed in such manner across the trajectory of sliding member 143 that the latter retracts said abutment 213, and releases lever 208-408,, when said sliding member 143 reaches the end of its active stroke and acts upon said projection 213
  • the positive transmission mechanism to be interposed between breechblock 34 and the sliding member 143 of the feed mechanism it comprises a cam 75 located in the gun and journalled about an axis parallel to the longitudinal axis of said gun.
  • This cam 75 is given an oscillatory movement about its longitudinal axis by a driving finger 84 carried by breechblock 34 and engaged in a helical groove 83 provided in said cam 75.
  • cam 75 is positively connected with sliding member 143 through teeth 89 carried by a cam '75, which meshes with a toothed section 90 provided with external teeth 144 meshing with a pinion 215 rigid with a pinion 216 which in turn meshes with a rack 217 carried by sliding member 143.
  • sliding member 143 and its control .pinion 216 have been shown as rotated through 90 toward the right in FIG. 2 with respect the positions they occupy in FIG. 1.
  • Curve C in solid lines illustrates the movement of gun 1 with respect to cradle 200 for a complete cycle of operation.
  • Curve C in dash-and-dot lines illustrates the movement of breechblock 34 during a complete cycle.
  • t shows the time of recoil of gun 1.
  • t shows the time for which the resilient energy accumulator 202 is placed under tension.
  • t represents the time for which said accumulator transmits energy to the reciprocating member 143 of the feed mechanism if the holding device is not used.
  • t represents the time of recoil for breechblock 34.
  • L represents the normal recoil of gun 1.
  • L represents the recoil stroke of the gun necessary for stressing accumulator 202.
  • the time for which the ac cumulator transmits energy to sliding member 143 is only a portion of the recoil time t; of the breechblock.
  • these neutralisation periods being obtained by giving the portions of the groove 83 of oscillating cam 75 that correspond to the beginning n and to the end 11 of the recoil stroke of said breechblock a rectilinear shape parallel to the generatrices of said oscillating cam.
  • a gun including a gun barrel longitudinally reciprocable with respect to said cradle,
  • a cartridge feed mechanism including a member movable with respect to said cradle
  • transmitting means for transmitting the energy stored up in said energy accumulating means along an energy transmission path to said feed mechanism movable member, said energy transmission path bypassing the breechblock, and
  • positive piloting means between said breechblock and said feed mechanism movable member for controlling the instantaneous positions of said movable member with respect to said cradle in response to the movement of said breechblock with respect to said cradle.
  • said breechblock is movable longitudinally with respect to said cradle and to said gun barrel and said positive piloting means include a cam journalled in said cradle about an axis parallel to the longitudinal axis of said gun barrel, said cam being provided with a curvilinear groove,
  • a gun according to claim 2 wherein the groove of said cam is provided, near its ends, with rectilinear portions parallel to the axis of said cam, said rectilinear portions being connected together by a portion of helical shape.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
US434572A 1964-02-25 1965-02-23 Automatic feed mechanism for a gun Expired - Lifetime US3326085A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU45519A LU45519A1 (US20100012521A1-20100121-C00001.png) 1964-02-25 1964-02-25

Publications (1)

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US3326085A true US3326085A (en) 1967-06-20

Family

ID=19723686

Family Applications (1)

Application Number Title Priority Date Filing Date
US434572A Expired - Lifetime US3326085A (en) 1964-02-25 1965-02-23 Automatic feed mechanism for a gun

Country Status (9)

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US (1) US3326085A (US20100012521A1-20100121-C00001.png)
BE (1) BE659044A (US20100012521A1-20100121-C00001.png)
CH (1) CH419908A (US20100012521A1-20100121-C00001.png)
DE (1) DE1453909B1 (US20100012521A1-20100121-C00001.png)
FR (1) FR1425716A (US20100012521A1-20100121-C00001.png)
GB (1) GB1022800A (US20100012521A1-20100121-C00001.png)
IL (1) IL22933A (US20100012521A1-20100121-C00001.png)
LU (1) LU45519A1 (US20100012521A1-20100121-C00001.png)
NL (2) NL6501402A (US20100012521A1-20100121-C00001.png)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1293021A (en) * 1916-10-13 1919-02-04 John M Browning Automatic machine-gun.
DE323401C (de) * 1918-05-28 1920-07-24 Gabriel Szakats Munitionstransportvorrichtung fuer Maschinenschiesswaffen mit rotierendem Zubringermechanismus
US2047596A (en) * 1933-01-20 1936-07-14 Rheinische Metallw & Maschf Cartridge feed device
US2644365A (en) * 1949-11-18 1953-07-07 Brev Aero Mecaniques S A Soc Feed mechanism for automatic firearms cartridge belt feed type
US3035495A (en) * 1958-07-03 1962-05-22 Fairchild Engine & Airplane Cartridge feeding mechanism
US3039364A (en) * 1960-05-03 1962-06-19 Aircraft Armaments Inc Barrel-feed mechanism
US3058398A (en) * 1959-12-23 1962-10-16 Aircraft Armaments Inc Automatic machine gun with recoiling barrel and hydraulic accelerator
US3198075A (en) * 1961-06-02 1965-08-03 Brevets Aero Mecaniques Automatic firearm with a recoiling barrel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1293021A (en) * 1916-10-13 1919-02-04 John M Browning Automatic machine-gun.
DE323401C (de) * 1918-05-28 1920-07-24 Gabriel Szakats Munitionstransportvorrichtung fuer Maschinenschiesswaffen mit rotierendem Zubringermechanismus
US2047596A (en) * 1933-01-20 1936-07-14 Rheinische Metallw & Maschf Cartridge feed device
US2644365A (en) * 1949-11-18 1953-07-07 Brev Aero Mecaniques S A Soc Feed mechanism for automatic firearms cartridge belt feed type
US3035495A (en) * 1958-07-03 1962-05-22 Fairchild Engine & Airplane Cartridge feeding mechanism
US3058398A (en) * 1959-12-23 1962-10-16 Aircraft Armaments Inc Automatic machine gun with recoiling barrel and hydraulic accelerator
US3039364A (en) * 1960-05-03 1962-06-19 Aircraft Armaments Inc Barrel-feed mechanism
US3198075A (en) * 1961-06-02 1965-08-03 Brevets Aero Mecaniques Automatic firearm with a recoiling barrel

Also Published As

Publication number Publication date
BE659044A (US20100012521A1-20100121-C00001.png) 1965-05-17
NL125983C (US20100012521A1-20100121-C00001.png)
GB1022800A (en) 1966-03-16
IL22933A (en) 1969-01-29
FR1425716A (fr) 1966-01-24
DE1453909B1 (de) 1970-04-16
NL6501402A (US20100012521A1-20100121-C00001.png) 1965-08-26
LU45519A1 (US20100012521A1-20100121-C00001.png) 1965-08-25
CH419908A (fr) 1966-08-31

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