US2756637A - Cartridge magazines for automatic firearms - Google Patents

Cartridge magazines for automatic firearms Download PDF

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Publication number
US2756637A
US2756637A US269416A US26941652A US2756637A US 2756637 A US2756637 A US 2756637A US 269416 A US269416 A US 269416A US 26941652 A US26941652 A US 26941652A US 2756637 A US2756637 A US 2756637A
Authority
US
United States
Prior art keywords
magazine
cartridge
cartridges
casing
wheels
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
US269416A
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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.)
Brev Aero Mecaniques S A Soc
Society "brevets Aero-Mecaniques " S A
Fujitsu Ltd
Original Assignee
Brev Aero Mecaniques S A Soc
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 Brev Aero Mecaniques S A Soc filed Critical Brev Aero Mecaniques S A Soc
Application granted granted Critical
Publication of US2756637A publication Critical patent/US2756637A/en
Anticipated expiration legal-status Critical
Assigned to FUJITSU LIMITED reassignment FUJITSU LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: IHIRA, KUNINOSUKE, KAKU, TAKASHI, UNAGAMI, SHIGEYUKI
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
    • F41A9/30—Sprocket-type belt transporters
    • 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
    • F41A9/73—Drum 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

Definitions

  • the present invention relates to cartridge magazines for automatic firearms, and more especially to magazines for firearms having a high rate of fire, for instance a rate of fire of at least 850-900 shots per minute for a 20 mm. caliber firearm.
  • the object of my invention is to provide a cartridge magazine of this kind which is better adapted than those existing at the present time to meet the requirements of practice.
  • a magazine such as above referred to, in which cartridges are disposed behind one another to form at least one line or file, are provided with a feed mechanism which constantly urges the line or file of cartridges toward the outlet of the magazine.
  • this feed mechanism is actuated by a spring or the like which is wound up when the cartridges are introduced into the magazine for loading it.
  • 1 make use of a portion of the recoil energy developed in the firearm every time a shot is fired to actuate a supplementary feed mechanism located along the line or file of cartridges in the magazine close to the outlet thereof, this supplementary feed mechanism being arranged to operate independently of the main feed mechanism to give the cartridge or cartridges located downstream of said supplementary mechanism an acceleration with respect to the remainder of said line or file of cartridges during the very short time for which the first cartridge is to pass into the firearm, the main feed mechanism subsequently causing said remainder of the line or file of cartridges to make up for their relative lagging.
  • Fig. l is a diagrammatic sectional view of a cartridge magazine made according to my invention.
  • Fig. la separately shows, in diagrammatic fashion, some elements of the magazine of Fig. 1;
  • Figs. 2, 3 and 4 are views, similar to Fig. 1, showing different relative positions of the parts of the magazine and its feed mechanisms;
  • Fig. 5 is a sectional view at right angles to that of Fig. l and on an enlarged scale.
  • the drum magazine shown by the drawing includes, in conventional fashion, two side plates 1a and 1b interconnected, at their lower parts (the magazine is supposed to be mounted above the breech casing 2 of the fire arm) by a piece 3 forming an introduction passage and engaging into said breech casing, this passage being provided at the bottom with two inwardly projecting edges 3 on which the first cartridge of the line or file present in the magazine rests, in introduction position, as shown by Figs. 1 and 4, to be caught by breech block 6.
  • Spiral ribs 4 carried by the inner faces of side plates 1a and 1b cooperate with the ends of the cartridges for guiding them toward said introduction passage.
  • a spring operated main feed mechanism constantly urges the cartridges toward the outlet of the magazine.
  • This feed magazine is constituted for instance by a spiral spring (not shown) acting upon a rotary telescopic arm 5 the end of which pushes the last cartridge of the line or file of cartridges toward the outlet of the magazine.
  • This driving spring is automatically wound up when the cartridges are successively driven into the magazine for loading it.
  • a supplementary feed mechanism acts, through toothed wheels 8a, 8b, located close to the introduction passage 3 on the two first cartridges of the line or file of cartridges to accelerate these two first cartridges when the first cartridge is to be moved from waiting into introduction position.
  • These two wheels 8a, 8b are arranged in line with each other, with their common axis parallel to the axes of the cartridges in the magazine.
  • the feed to. the firearm of the first cartridge in the magazine is controlled by a mechanism which performs always the sariie cycle of operations for every shot that is being fired, under the effect of an energy supplied by the firearm itself, so that the drawbacks inherent in the use for this purpose of an extraneous energy, such as that of a spring wound upin advance to unwind gradually as the successive shots of the magazine are being fired, are avoided.
  • drawbacks include for instance the considerable weight and volume of such a spring, its unreliability, etc.
  • the wheels 8a and 8b of the supplementary feed mechanism are keyed on a hollowshaft 10 journalled 1n the side plates 1a and 1b of the magazine.
  • a torsion bar 11- (diagrammatically represented by a dot-and-dash line on Figs. l to 4) has one end thereof fixed by means of splines 11a to one end of said shaft 10. The other end of this torsion bar 11 is fixed by means of splines 11b to the toothed wheel '12 of a ratchet drive mechanism mounted on the outside of the magazine, for instance between two side plates 13 and 14 fixed to the rear side plate 172 of said magazine.
  • a toothed wheel 29 (the teeth of which advantageously have unequally inclined flanks) subjected to the action of a pawl 30 the end of which is constantly urged against said wheel 29 by a spring 31, preferably'adjustable, for instance by means i of a threaded plug 32.
  • Torsion bar 11 in combination with hollow shaft 10 (which, insofar as it is also twisted, constitutes a torsion element) form the elastic energy accumulator above referred to.
  • the ratchet drive mechanism includes, in combination with ratchet wheel 12, a holding pawl 15 the pivot spindle 16 of which is mounted between side plates 13 and 14 and a driving pawl '17 the pivot spindle 18 of which is mounted'between'the branches 19a and 19b of a double lever 19 pivoted about a spindle 20 extending between side plates 13 and 14, a slot 190 being provided in lever 19 to enable the end 115 of torsion bar 11 to pass through said lever.
  • Double lever 19 carries a roller 21 adapted to cooperate with a cam surface 9 belonging to a piece rigid with the breech casing of the firearm.
  • This roller 21 is so located that when it runs up the slope of this surface 9, it causes lever 19 to pivot about spindle 20 in anti-clockwise direction against the action of an antagonistic spring 22 interposed between said lever 19 and a fixed point of the magazine casing.
  • Wheels 3a and 8b must be disconnected from torsion bar 11 and ratchet wheel 12 when the cartridges are being introduced into the magazine for the loading thereof.
  • This result is obtained by means of a disconnecting piece 23 pivoted freely in coaxial relationwith the right hand end (Fig. 5) of torsion bar 11, between side plate 14 and the branch 1% of lever 19.
  • Piece 23 carries two pins 24 and 25 intended to cooperate respectively with driving pawl 17 and holding pawl 15 respectively, when said piece 23 is in the position shown in solid lines in Fig. 1a. In this position, driving pawl 17 and hold ing pawl 15 are retracted (i. e. moved out of contact with ratchet wheel 12), against the action of their respective return springs 26 and 27, by pins 24 and 25 respectively.
  • Fig. 1 corresponds to the above mentioned positions of the parts, except for pawls 17 and 15 which are shown retracted in this figure.
  • Holding pawl 15 has got past a tooth of ratchet wheel 12 in the course of this rotation thereof, so that this wheel is now prevented from moving backward, even when, due to the subsequent frontward return movement of the firearm, roller 21 runs down cam surface 9. Torsionbar 11 will therefore now remain twisted as long as cartridges b and care not allowed to proceed toward the outlet 3. However, these cartridges are strongly urged in this direction by wheels 8a and 8b subjected to the reaction of torsion of this movement it catches cartridge a, which was in introduction position and drives it into the cartridge chamber of the firearm. As soon as cartridge a has thus been caught by the cartridge block,
  • torsion bar 11 When breech block 6 has moved sufliciently backward to allow cartridge b to pass from waiting position to introduction position, torsion bar 11 untwists, thus imparting a sudden rotation movement to wheels 8a and 8b in the anti-clockwise direction (indicated by the arrow of of Fig. 4) and cartridges b and 0, suddenly accelerated toward the magazine outlet, are moved quicker than the remainder of the file or line of cartridges, which follow at a slower rate under the action of the main feed mechanism. At the end of this release movement of torsion bar 11, this bar is still a little twisted.
  • roller 21 When the firearm is nearing the end of its frontward return movement, roller 21 is again at the level of the bottom of sloping surface 9 and the corresponding movement of lever 19 has brought driving pawl 17 behind the next tooth of ratchet wheel 12.
  • This step is illustrated by Fig. 4, which difiers from Fig. 1 (corresponding to the position before the first shot is fired) in that torsion bar 11 is still partly twisted.
  • breech block 6 catches cartridge b in introductory position so that cartridge 0 can move down into waiting position under the effect of wheels 8a and 8b urged by torsion bar 11.
  • These wheels are temporarily stopped by the action of pawl 30 coming against the steep flank of one tooth of wheel 29 (which is rigid with wheels 8a8b.
  • cartridge d moving down together with the other cartridges driven by the main feed mechanism can engage between two teeth of each of said wheels 8a8b without risking to catch the edge of one of said teeth.
  • the resistance of temporary holding pawl 30 is overcome by the combined actions of the main feed device and of torsion bar 11, which is still slightly twisted, and wheels 8a-8b finally come into the position shown by Fig. 2.
  • Fig. 1 therefore shows the position existing before the first shot is fired, and the cycle of operation is illustrated by the successive positions of Figs. 2, 3 and 4.
  • a cartridge magazine adapted to be removably secured to said support and including a casing having an outlet located along the path of reciprocation of said breech block, means in said casing for guiding a file of cartridges toward said outlet, a main feed mechanism carried by said casing for constantly urging the last cartridge of said file toward said outlet, a supplementary feed mechanism comprising a hollow shaft journaled in said casing parallel to said cartridges, two coaxial toothed wheels keyed on said shaft and located along the path of said file, close to said outlet, to engage the cartridges as they are nearing said outlet and to accelerate the portion of the file of cartridges downstream of said wheels, a cam carried by said breech casing, a lever pivoted to said casing and arranged to run on said cam during a portion of the reciprocating movement of said bre
  • a combination according to claim 1 further including means for holding at will said pawls out of contact with said ratchet wheel.
  • a combination according to claim 1 further including a yieldingly locking toothed wheel rigid and coaxial with said control toothed Wheels, a pawl movably carried by said casing and means for constantly urging said pawl against said locking toothed wheel.
  • a cartridge magazine adapted to be removably secured to said support and including a casing having an outlet located along the path of reciprocation of said breech block, means in said casing for guiding a file of cartridges toward said outlet, a main feed mechanism carried by said casing for constantly urging the last cartridge of said file toward said outlet, a supplementary feed mechanism comprising two coaxial toothed wheels journalled in said casing along the path of said file and close to said outlet to engage the cartridges as they are nearing said outlet and to accelerate the portion of the file downstream of said wheels, a cam carried by said breech casing, a member movably carried by said casing arranged to run on said cam during a portion of the reciprocating movement of said breech casing, a torsion bar, means interconnecting one end of said torsion bar with said movable member

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Toys (AREA)
US269416A 1951-02-17 1952-02-01 Cartridge magazines for automatic firearms Expired - Lifetime US2756637A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
LU1056956X 1951-02-17
LU1014886X 1951-02-17
LU696353X 1951-02-17
LU301848X 1951-02-17
LU2756637X 1951-02-17

Publications (1)

Publication Number Publication Date
US2756637A true US2756637A (en) 1956-07-31

Family

ID=61223639

Family Applications (1)

Application Number Title Priority Date Filing Date
US269416A Expired - Lifetime US2756637A (en) 1951-02-17 1952-02-01 Cartridge magazines for automatic firearms

Country Status (8)

Country Link
US (1) US2756637A (nl)
BE (1) BE508937A (nl)
CH (1) CH301848A (nl)
DE (1) DE1014886B (nl)
FR (1) FR1056956A (nl)
GB (1) GB696353A (nl)
LU (1) LU30583A1 (nl)
NL (1) NL93287C (nl)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910917A (en) * 1955-08-16 1959-11-03 Mach Tool Works Oerlikon Admin Drum magazine for automatic fire arms
US3230828A (en) * 1962-12-21 1966-01-25 Bervets Aero Mecaniques S A Belt feed mechanisms for automatic firearms
US3362293A (en) * 1965-03-02 1968-01-09 Bofors Ab Round feeding mechanism for automatic guns
EP0111780A2 (de) * 1982-12-22 1984-06-27 Werkzeugmaschinenfabrik Oerlikon-Bührle AG Fördervorrichtung zum Zuführen von Patronen zu einer Feuerwaffe aus einem Trommelmagazin
EP0123798A2 (en) * 1980-12-11 1984-11-07 Chartered Industries Of Singapore Private Limited Drum magazine for a gun
US5111732A (en) * 1988-09-28 1992-05-12 L'etat Francais Automatic weapon with small barrel for rapid firing
USD765813S1 (en) 2014-12-31 2016-09-06 Magpul Industries Corporation Drum magazine for a firearm

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4524673A (en) * 1982-09-29 1985-06-25 Western Design Corporation Gun powered ammunition magazine
CA2910973C (en) * 2013-06-03 2020-02-11 Profense, Llc Minigun with improved feeder sprocket and shaft

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE495449A (nl) *
US1413694A (en) * 1920-07-20 1922-04-25 Vollmer Heinrich Cartridge-feeding device
US2596293A (en) * 1946-11-27 1952-05-13 Mach Tool Works Oerlikon Admin Cartridge feeding mechanism for the magazines of automatic firearms
US2697381A (en) * 1951-02-19 1954-12-21 Brevets Aero Mecaniques Device for transforming a reciprocating linear motion into a rotary motion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE495449A (nl) *
US1413694A (en) * 1920-07-20 1922-04-25 Vollmer Heinrich Cartridge-feeding device
US2596293A (en) * 1946-11-27 1952-05-13 Mach Tool Works Oerlikon Admin Cartridge feeding mechanism for the magazines of automatic firearms
US2697381A (en) * 1951-02-19 1954-12-21 Brevets Aero Mecaniques Device for transforming a reciprocating linear motion into a rotary motion

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910917A (en) * 1955-08-16 1959-11-03 Mach Tool Works Oerlikon Admin Drum magazine for automatic fire arms
US3230828A (en) * 1962-12-21 1966-01-25 Bervets Aero Mecaniques S A Belt feed mechanisms for automatic firearms
US3362293A (en) * 1965-03-02 1968-01-09 Bofors Ab Round feeding mechanism for automatic guns
EP0123798A2 (en) * 1980-12-11 1984-11-07 Chartered Industries Of Singapore Private Limited Drum magazine for a gun
EP0123798A3 (en) * 1980-12-11 1985-05-22 Chartered Industries Of Singapore Private Limited Drum magazine for a gun
EP0111780A2 (de) * 1982-12-22 1984-06-27 Werkzeugmaschinenfabrik Oerlikon-Bührle AG Fördervorrichtung zum Zuführen von Patronen zu einer Feuerwaffe aus einem Trommelmagazin
EP0111780A3 (en) * 1982-12-22 1985-09-25 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Device for feeding ammunition from a drum magazine to a gun
US4589325A (en) * 1982-12-22 1986-05-20 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Cartridge conveyor, especially for conveying cartridges from a drum-type magazine to a firing weapon
US5111732A (en) * 1988-09-28 1992-05-12 L'etat Francais Automatic weapon with small barrel for rapid firing
USD765813S1 (en) 2014-12-31 2016-09-06 Magpul Industries Corporation Drum magazine for a firearm

Also Published As

Publication number Publication date
CH301848A (fr) 1954-09-30
GB696353A (en) 1953-08-26
DE1014886B (de) 1957-08-29
NL93287C (nl) 1960-02-15
FR1056956A (fr) 1954-03-04
BE508937A (fr) 1952-08-02
LU30583A1 (fr) 1952-08-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FUJITSU LIMITED, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:UNAGAMI, SHIGEYUKI;IHIRA, KUNINOSUKE;KAKU, TAKASHI;REEL/FRAME:004018/0234

Effective date: 19820617