EP0054089A1 - Drum magazine for a gun - Google Patents
Drum magazine for a gun Download PDFInfo
- Publication number
- EP0054089A1 EP0054089A1 EP80304480A EP80304480A EP0054089A1 EP 0054089 A1 EP0054089 A1 EP 0054089A1 EP 80304480 A EP80304480 A EP 80304480A EP 80304480 A EP80304480 A EP 80304480A EP 0054089 A1 EP0054089 A1 EP 0054089A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cartridges
- sprocket means
- housing
- sprocket
- drum magazine
- 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.)
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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
- F41A9/61—Magazines
- F41A9/64—Magazines for unbelted ammunition
- F41A9/73—Drum magazines
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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
- F41A17/00—Safety arrangements, e.g. safeties
- F41A17/34—Magazine safeties
- F41A17/38—Magazine mountings, e.g. for locking the magazine in the gun
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Description
- This invention relates to a drum magazine for a gun.
- Known drum magazines tend to suffer from friction losses caused by friction between the cartridges in the magazine and the internal surfaces of the magazine. Although it might be expected that there would be rolling friction with the cartridges, in fact, there is no rolling friction, but simply sliding friction.
- One known drum magazine is the Thompson which is capable of holding up to fifty rounds and is described in "The World's Sub-machine Guns (Machine-Pistols)",, Volume.1 by Thomas B. Nelson, International Small Arms Publishers, Cologne, West Germany, first edition, second printing June 1964, pages 51 to 53. In the Thompson magazine there is a spiral guide in which the cartridges are arranged in, effectively, rows and the cartridges are swept out of a feed throat by six radial, rotating, arms driven by a spring which sweep all of the cartridges simultaneously around the rows. The friction in such a magazine is very great and it has been found that it is not practical to provide more than two spiral rows. However, it is possible to increase the capacity of such a magazine by increasing the drum diameter without increasing the number of rows, but the magazine then becomes undesirably bulky.
- In an attempt to reduce the friction losses, a further known magazine is the Soumi drum magazine, described in the forementioned book at pages 562 - 565 and shown in Figures 1 and 2 of the accompanying drawings. In the Soumi magazine, a circular, pan-like housing .1' is provided having a rotatable base plate 2' upon which the cartridges sit in paths 3', 4' defined by concentric guides 5', 6' and the inner surface of the housing 1' respectively and a bridge 7' linking the paths 3', 4'; the guides 5', 6' and. bridge 7' being rotatable with the base plate 2'. The housing has a throat 8', a feed ramp 9' and a stop 10' with which a lug 11' mounted on the guide 5' co-operates. A coil spring (not shown) beneath a rotor 12' drives the rotor and an associated pivotal pusher 13'. The cartridges are referenced 15' and the cartridge adjacent the lug 11' is referenced 16'.
- In operation, the spring drives the rotor 12' and pusher 13' which applies pressure in the direction of arrow-headed line A, through all of the cartridges up to the lug 11' so that it is. the pressure on cartridge 16' which drives the guides 5', 6' and the base plate 2'. The pressure on lug 11' thus urges the cartridges up the ramp 9' and through the feed throat 8'. There is, thus, frictional resistance between the cartridges in the outer row pushing outwardly against guide 1', although the inner row of cartridges is rotatably carried by the base plate 2' for the first partial revolution until the cartridges in the outer row are ejected through the throat 8' and this frictional resistance is less than that associated with the Thompson magazine. The friction is less than with the Thompson magazine because the guides 5', 6' that form the inside and outside diameter of the innermost row of ammunition moves with the ammunition for the first revolution. During that revolution, the outer row is driven out of the feed throat, but its inside diameter guide moves with it so that the outer row has only one half the sliding friction contact of the Thompson type and the inner row has none at all. When, however, the lug 11' engages the stop 10', the bridge 7' from the inner path 3' to the outer path 4' is in alignment with the feed throat 8' and the base plate 2' no longer rotates so that the inner row of cartridges abrade against the stationary guide surfaces, thereby producing a high friction force which is similar to that of the Thompson magazine. Additionally, because the pusher 13' exerts pressure on the
last cartridge 15' in the magazine to drive all the other cartridges and because the cartridges are circularly arranged, the cartridges are forced outwardly against the guide surfaces, thereby increasing friction. It has, again, been found impractical to increase the number of paths to improve the capacity of such a magazine and if increased capacity is sought it is, once again, necessary to increase the drum diameter undesirably. - A further disadvantage of the forementioned drum magazines is that they can only readily be filled with cartridges by removing the circular planar cover, since they can only be filled through the feed throat by sliding cartridges between the feed lips in the axial direction of the housing.
- The present invention seeks to provide a drum magazine of compact dimensions and of relatively large capacity which exhibits less friction to cartridge movement than the drum magazines described above.
- According to this invention in its broadest aspect, there is provided a drum magazine for a gun including a housing having a peripheral wall defining a circularly cross-sectioned interior, a feed throat extending through the said wall for releasing cartridges from the housing, and at least two rotatable concentric sprocket means, and aperture means for permitting cartridges to pass from the inner sprocket means to the outer sprocket means, the outer periphery of the sprocket means each having a plurality of serrations arranged to nest a plurality of cartridges.
- Preferably, the sprocket means each comprise a concentric tubular member, at least two circular, radially extending flanges spaced therealong, each flange having serrations to nest a plurality of cartridges therebetween, the serrations on the flanges of the inner sprocket means being spaced from the inner surface of the next adjacent outer sprocket means by substantially the same distance as the serrations on the flanges of the outermost sprocket means are from the housing interior peripheral wall, a cartridge feed aperture in each tubular member except the innermost for permitting cartridges to pass through the apertured tubular members and feed ramp means arranged to guide cartridges from each of the sprocket means to the feed throat.
- Advantageously, the feed ramp means comprise a ramp extending from the feed throat for scooping cartridges from the outermost sprocket means and a further ramp on one major side of the cartridge feed aperture in the tubular members extending inwardly for scooping cartridges from the adjacent inner sprocket means, and another ramp on the other major side of the cartridge feed aperture in the tubular members for guiding the cartridges along said further ramp.
- Preferably, stop means are provided for sequentially limiting the relative rotation between each of the sprocket means and the housing which are arranged to sequentially align the ramps of the sprocket means in turn, starting with the outermost sprocket means. Advantageously, the stop means comprise co-operating abuttable stop members provided between the housing and the outermost sprocket means and between adjacent sprocket means except between the innermost sprocket means and the sprocket means adjacent thereto.
- Preferably, the stop means include first co-operating stop members provided one on the housing and the other on the outermost sprocket means whereby, from a fully loaded position, the sprocket means rotate together until the cartridges in the outermost sprocket means have fed along said ramp through said feed throat whereupon the first co-operating stop members prevent further rotation of the outermost sprocket means, the further ramp on the outermost sprocket means aligns with the said ramp and the adjacent inner sprocket means continues to rotate and feed cartridges therefrom along said further ramp through the apertured tubular member of the outermost sprocket means and along said ramp to the feed throat.
- In a currently preferred embodiment having three sprocket means, first co-operating stop members are provided, one on the housing and the other on the outermost sprocket means, and second co-operating stop means are provided, one on the outermost sprocket means and the other on the adjacent inner sprocket means.
- Advantageously, the housing is a plastics moulding which is pan-shaped.and has a cover also formed by moulding plastics and, conveniently, a recessed track is formed in the housing and cover for locating and guiding the sprocket means. Additionally, the sprocket means may also be made from a plastics material.
- Advantageously, a pusher is provided which is mounted on the innermost sprocket means which is arranged to push those remaining cartridges not pushed by nested cartridges along the feed ramp means to the feed throat. Conveniently, the pusher comprises a U-shaped member with the free ends thereof mounted on a pivot extending between the flanges of the innermost sprocket means, each limb of the U-shape being adjacent an associated flange and a rod located along the base of the U-shaped member which is nested in similar fashion to the cartridges on the flanges, whereby the length of the limbs of the U-shaped member is sufficient to enable the last cartridge in the magazine to be pushingly fed by the rod to the outer extremity of the feed throat. Because the pusher is normally nested on the innermost sprocket means until the last six remaining rounds remain in the magazine, there is no pressure on the pusher and unlike the prior art the pusher does not have the function of pushing all of the cartridges to the feed throat outer extremity.
- Preferably, the sprocket means are driven'by a torsion spring, tensioned between a central axle and a slot in the tubular member of the innermost sprocket means.
- Preferably, the serrations are arranged so that the cartridges, when nested in the serrations, have axes which are substantially parallel to the axes of the housing and sprocket means.
- Advantageously, a guide is provided on the said ramp and said further ramp to tilt a cartridge passing therealong so that cartridges pass along the ramps in an inclined, nose-up, condition.
- Preferably, the outer extremity of the feed throat is defined by a fixed lip extending over the feed throat and a spring-biassed pivotal lip, the spacing between the lips being such that a cartridge leaving the feed throat can only be slid therefrom in the direction of the housing axis. Advantageously, the pivotal lip is arranged such that by pressing a cartridge on the outer surface thereof, the pivotal lip is rotated to permit access of the cartridge to the feed throat in a direction substantially perpendicular to the housing axis. The pivotal lip, advantageously, has a tail portion which, when the magazine is in a gun receiver, prevents the pivotal lip from rotating. Preferably, the fixed lip is tapered in a direction to permit the nose of a cartridge to be directed upwardly away from the feed throat.
- Preferably, latch means are provided between the housing and the outermost sprocket means and further latch means are provided between adjacent sprocket means except between the innermost sprocket means and the sprocket means adjacent thereto, each said latch means being engageable when the co-operating stop members abut each other such that each said latch means prevent rotation of an associated latched sprocket means until the serrations thereof are required to be filled with cartridges.
- Conveniently, the latch means between the housing and the outermost sprocket means comprise a strip member pivotally connected to the outermost sprocket means and spring biassed toward the inner peripheral wall of the housing, and a recess or aperture in said peripheral wall, the strip member having an ear for engaging with the lip of the recess or aperture when the stop members associated with the housing and outermost sprocket means abut. The further latch means between adjacent sprocket means conveniently comprise a strip member pivotally connected to the inner of the two adjacent sprocket means which is spring biassed toward the inner wall of the tubular member of the adjacent outer sprocket means, and a recess or aperture in said inner wall, the strip member of the further latch means having an ear for engaging with a lip of the recess or aperture in said inner wall when the stop members associated with the adjacent sprocket means abut.
- Advantageously, said strip member has a tang on the opposite side of the associated pivot from the ear,which tang passes through the tubular member of the sprocket means to which it is attached and toward the adjacent inner sprocket means, whereby the tang is arranged to have a length sufficient to be contacted by a cartridge on said adjacent inner sprocket means for the strip member to be rotated thereby such that the ear of the strip member disengages its associated lip and permits the sprocket means to which the strip member-is attached to rotate. Because cartridges in the ramps are pushed outwardly by the force of the torsion spring, preferably the strip member is located in the wall of the tubular member of the sprocket means to which the strip member is attached and arranged to be depressed thereinto by cartridges on said sprocket means and, advantageously, the strip member has a finger adjacent said ear but directed inwardly to pass through an aperture in the tubular member of the sprocket means to which said strip member is attached, said finger having a.length and position such that when the strip member is depressed by cartridge; it is displaced between cartridges on the inner adjacent sprocket means to rotate said adjacent sprocket means in a direction agains' the spring force to thereby free the pressure on the cartridges in the ramps.
- Advantageously, a last round stop actuator comprises a spring biassed member located adjacent to a limb of the pusher for travelling with said limb, whereby the spring biassed member is extended outside the housing when said pusher rod is extended toward the outer extremity of the feed throat.
- In a currently preferred embodiment, the last round stop actuator is a leaf spring having one end connected to the pivot of the pusher and the other end thereof connected to a button, whereby the button is adjacent and biassed toward the cover and protrudes therefrom when the rod is extended in the feed throat. In an alternative embodiment, the last round stop actuator is a plunger and spring assembly located in the rod of the pusher arranged so that the plunger is adjacent and biassed toward the cover and protrudes therefrom when the rod is extended in the feed throat.
- Preferably, the magazine is arranged to be held in position on the gun receiver by holes provided in one side of a neck partially bounding the feed throat which are spaced in-the direction of the housing axis and by a radial key on the cover.
- According to a feature of this invention, there is provided a detachable cartridge drum magazine for a gun including a housing having a peripheral wall defining a circularly cross-sectioned interior, a feed throat extending through said wall for releasing cartridges from the housing, said feed throat having opposing longitudinal sides located in the axial direction of the housing, and on each said side of the feed throat there being a lip, one lip of which is pivotally biassed toward a closed position which acts as a one way valve, whereby the lips are operative to prevent a cartridge from being ejected therefrom except by sliding in the axial direction of the housing, but said one lip is pivotal-to an open valve position to permit cartridges to be fed into the feed throat in a direction perpendicular to the housing axis.
- In said feature, preferably the other lip is fixed and partially extends over the feed throat and the pivotal lip is arranged such that by pressing the cartridge on the outer surface thereof the pivotal lip is rotated toward the feed throat to permit access of the cartridge to said feed throat.
- According to a further feature of this invention, there is provided a drum magazine for a gun including a stationary housing, two substantially concentrically rotatably mounted members, drive means for rotating the members in a first direction, stop means for limiting rotation of the outer member with respect to the housing, and latch means between the outer member and the housing arranged to lock when the stop means limit the rotation of the outer member to thereby prevent rotation of the outer member in a counter direction to the first direction until the inner member is rotated in said counter direction a predetermined amount.
- In a preferred embodiment of said further feature, said members each comprise a substantially concentric sprocket means, each said sprocket means having an outer periphery provided with a plurality of serrations arranged to nest a plurality of cartridges.
- Conveniently, the sprocket means each comprise a concentric tubular member at least two circular, radially extending flanges spaced therealong, each flange having serrations arranged to nest a plurality of cartridges therebetween, the serrations of the innermost sprocket means being spaced from the inner surface of the next adjacent outer sprocket means by substantially the same distance as the serrations of the outermost sprocket means are from the housing interior peripheral wall, a cartridge feed aperture in each tubular member except the innermost for permitting cartridges to pass through the apertured tubular members and feed ramp means arranged to guide cartridges from each of the sprocket means to the feed throat. Alternatively, each sprocket means may be provided with the serrations directly in the outer periphery of the tubular member.
- In an alternative embodiment of said further feature, the rotatably mounted members are concentrically arranged and the outer member comprises a base plate and cartridge guide rails extending from said base plate which define substantially concentric cartridge paths which are linked by a bridge. In said alternative embodiment, the inner member is a driving means which comprises a spring driven rotor connected to a pivotal pusher which is arranged to apply force to push the cartridges around said path means.
- According to another feature of this invention, there is provided a drum magazine for a gun including a stationary housing, two substantially concentrically rotatably mounted members, at least one of said members being capable of supporting cartridges, drive means for rotating said members and a connector having a part thereof attached to one of said members through which drive is capable of predeterminedly passing from one of said members to the other said member such that the members rotate together and wherein disconnection of said connector enables, one member to rotate with respect to the other member.
- Advantageously, both members are capable of carrying cartridges.
- Preferably, the members are sprocket means, each having an outer periphery in which is provided a plurality of serrations arranged to nest a plurality of cartridges. In a preferred embodiment of said another feature, the sprocket means comprise at least two circular, radially extending flanges axially spaced along a tubular member, each flange having serrations to nest a plurality of cartridges between the said flanges.
- Preferably, the latch means in said further feature incorporate the connector of said another feature.
- According to yet another feature of this invention, there is provided a drum magazine including a housing, means for supporting cartridges within said housing, a pusher which is capable of pushing remaining cartridges from said housing, and a last round stop actuator comprising a spring biassed member located adjacent to and arranged to travel with the pusher, whereby the spring biassed member is extended outside the housing when the pusher is extended toward the outer extremity of a feed throat of the housing.
- The invention will now be described, by way of example, with reference to the accompanying drawings, in which
- Figure 3A shows in partial section a schematic view of a drum magazine in accordance with this invention,
- Figure 3B is a cross-section along double arrow-headed
line 3B - 3B of Figure 3A, with the pusher removed, - Figure 3C is a view in the direction of double arrow-headed
line 3C - 3C of Figure 3B showing the arrangement of the stops for the intermediate and outer sprockets but with the cartridges removed, - Figure 4 is a view similar to Figure 3A but with the parts in different positions,
- Figure 5A is a view similar to Figure 3A but with the parts in a different position,
- Figure 5B is a detail of the encircled portion arrowed 5B in Figure 5A drawn to a larger scale and incorporating, in phanto lines, a part of the magazine well of the gun,
- Figure 6 is a view similar to Figure 3A but with the parts in a different position,
- Figure 7A is a view similar to Figure 3A but with the parts in a different position,
- Figure 7B is a view along double arrow-headed
line 7B - 7B of Figure 7A, - Figure 8A ia a top view of the housing,
- Figure 8B is a view in the direction of arrow-headed line 8B of Figure 8A,
- Figure 8C is a cross-sectional view along double arrow-headed
line 8C - 8C of Figure 8B, - Figure 9A is a side view of an outer sprocket,
- Figure 9B is a cross-sectional view along double arrow-headed
line 9B - 9B of Figure 9A, - Figure 9C is a view in the direction of arrow-headed line 9C in Figure 9A,
- Figure 10A is a side view of an intermediate sprocket,
- Figure 10B is a view in the direction of arrow-headed
line 10B of Figure 10A, - Figure 10C is a view in the direction of arrow-headed
line 10C of Figure 10A, - Figure 11A is a plan view of an inner sprocket,
- Figure 11B is a view along double arrow-headed
line 11B - 11B of Figure 11A, - Figure 12A is a top plan view of a cover,
- Figure 12B is a cross-sectional view along double arrow-headed
lines 12B - 12B of Figure 12A, - Figure 12C is a view in the direction of arrow headed-
line 12C of Figure 12A, and - Figure 13 is a partial view of an alternative last round stop actuator.
- In the Figures 3A - 13 like references denote like parts.
- In the Figures 3A, 4, 5A, 6 and 7A the cartridges are denoted by the prefix C so it will be seen from Figure 3A that in the fully loaded position the magazine holds 100 cartridges.
- The drum magazine shown in Figures 3A to 7B has a circularly cross-sectioned,
pan-shaped housing 40 having acover 41 within which is concentrically mounted anouter sprocket 42, anintermediate sprocket 43, and an inner sprocket 44. The drum, cover and each of the sprockets are made from moulded plastics and each of the sprockets is spool-shaped having a central tubular body and at each end of the body is a radially extending flange each having a like number of serrations around the outer periphery for holding cartridges. The serrations in the flanges adjacent abase 404 of the housing have a greater radial extent than the serrations in the arms adjacent thecover 41 to allow for the taper of a cartridge and so that the cartridge axes are approximately parallel to the axis of the housing. Theinner sprocket 44 has serrations to hold each of cartridges C1 - C24, " theintermediate sprocket 43 has a serration to hold each of cartridges C27 - C57 and theouter sprocket 42 has a serration to hold each of cartridges C60 - C98. In the assembled position, shown in Figures 3A - 7B, the sprockets are located in thehousing 40 so that feed ramps 434, 441 on the housing, 455, 455' on the outer sprocket, and 471, 471' on the intermediate sprocket adopt the positions shown in Figure 3A and thefeed ramp 434 extends to the base of cartridge C98, the feed ramp 455' extends to the base of cartridge C58 and the feed ramp 471' extends to the base of cartridge C25. In this way the feed ramps are effective to scoop up the cartridges in the sprockets with which the ramps are associated and theramps 441, 455', 471' act as guides for the cartridges. Mounted to be fixed on the axis of the housing 1 is anylon spindle 45 secured to the housing and cover respectively by screws 400,401. The spindle has anear 402 to which is secured one end of a sheet metal clock-type torsion spring 46, the other end of thespring 46 being secured to anaperture 403 in theinner sprocket 44. - As best shown in Figures 7B and in phantom lines in Figure 11A, a
pusher 47 is mounted on theinner sprocket 44. Thepusher 47 has aspindle 405 positioned between the arms of the inner sprocket and pivotally mounted on thespindle 405 is aU-shaped arm 406 with the limbs of the U-shape within the confines of the inner sprocket flanges and adjacent a respective flange. - The free ends of the U-shape are secured to the
spindle 405 and arod 407 having the approximate shape of a cartridge is welded to the base of the U-shape. Therod 407 has atail 408 which is locatable in a serration of the inner sprocket and a bevelled top portion 409 (as viewed in Figure 7B) remote from thetail 408 to facilitate a bolt of the gun to which the magazine is secured to ride over therod 407. Connected to thespindle 405 between theU-shaped arm 406 and the wing of the inner sprocket adjacent thecover 41 is a lastround stop actuator 48 comprising aspring arm 413 which is biassed toward . thecover 41 and abutton 414 which may contact a mechanism within a gun receiver to which the magazine is mounted so that when the last cartridge from the magazine is fired the bolt mechanism can be held in the cocked position. It is in the event that the last round stop actuator fails to operate the mechanism within the gun receiver that the bevelledportion 409 is provided so that the bolt will strike the pusher obliquely to the bevel. Thetail 408 of the pusher is extended so that it may co-operate with a sprocket latch, as will be described later herein. - The
housing 40 has afeed throat 415 defined by aneck 416 having longitudinal sides in the axial direction of the housing and which is arranged to'be located in the magazine well of a gun. Theneck 416 has, on its right hand side (as viewed in Figures 3A and 4 - 7A), apivotal lip 417 and on its left hand side an arcuate, fixedlip 418 extending over the feed throat. Referring particularly to Figure 5B, the neck of the magazine is shown located in a well of a gun (the well being shown in phantom lines). The pivotinglip 417 is mounted on anaxle 419 and has anarm 420 with an arcuateupper surface 421, generally the same radius as a cartridge, and atail 422 of such a length that, when the magazine is inserted into the well of a gun, the tail prevents rotation of thelip 417 so that it is not possible for thelip 417 to adopt the position shown in solid line in Figure 5B when mounted in the gun well. Thelip 417 is biassed by a spring (not shown) so that the bottom of the lip (as viewed in Figure 5B) is normally horizontal, as shown in phantom lines. The distance between thelips lip 417 spring biassed in a clockwise direction (as shown in Figure 4 for example and in Figure 5B in phantom lines) it is not possible for a cartridge to be removed from above the lips so the cartridges may not fall out of the magazine. When the magazine is removed from the gun the cartridge may, however, be unloaded from the magazine in a direction perpendicular to the cartridge longitudinal axis by depressinglip 417. In use, the cartridges are axially slid from the magazine by a bolt of the gun. A latching mechanism is provided to secure the magazine to the well of the gun and,conveniently, such a mechanism comprises a pair of pins which may be slidably mounted through one of the walls of the magazine well into co-operating holes in theneck 416 of the housing, these holes being referenced 423 in Figure 8A and one of the pins being shown in phantom lines in Figure 5B. - The
pan-shaped housing 40, shown in Figure 8A, 8B and 8C has an open top 424 to which thecover 41 is connected by internally screw threadedbosses 425 and located bypins 426 on each side of theneck 416. Thehousing 40 has a largeinternal diameter portion 427 for accommodating the body of the cartridge in the outer sprocket and a reducedinternal diameter portion 428 in the region of the nose (bullet) portion of the cartridge and theportion 428 is connected to abase 429. The base has acircular protrusion 430, the interior of which acts as a bearing surfac-e-upon which theouter sprocket 42 andintermediate sprocket 43 rotate. In this respect, theconcentric protrusion 430 has a radiallyouter side 444 to concentrically locate theouter sprocket 42 and aninner side 445 to locate theintermediate sprocket 43 in a concentric fashion. Thebase 429 is dished to provide aninner boss 431 providing abearing surface 432 and aconcentric guide surface 433 for theinner sprocket 44. On the axis of the drum in theboss 431 is a hole for thescrew 400. The fixedlip 418, as best seen in Figure 8A, is tapered inwardly of the housing so as to permit cartridges which are trapped byT'the lips lip 418 permitting the cartridge body to rise slightly higher than the region of the cartridge toward the cannelore. This allows the cartridge to assume an ever increasing upward angle as it is driven in operation forwardly by the bolt so that it can enter the chamber smoothly without the base or cannelore end being forced downwardly. Such action is in distinction to the usual feed path of conventional magazines where, as the cartridge is driven forwardly, the bullet end is forced upwardly as it enters a feed ramp and the base end goes downwardly. This is because the forward corner of the conventional feed lip contacts the center, body, portion of the cartridge and acts as a fulcrum so that as the hullet end rises the base end is forced downward, thus causing the other cartridges in the magazine to be pushed downward in the magazine. In magazines of large capacity such reversing action (driving the bulk of the cartridges backwardly) requires substantial short term energy and has the undesirable effect of retarding bolt motion. - On the side of the
feed throat 415 adjacent the fixedlip 418 is afeed ramp 434 having at its outer side a notch 435 to accommodate the serrations of the outer sprocket and at the inner side of thefeed ramp 434 is aweb guide 436 for the cartridges. Also provided on the same side of the throat as the fixed lip is astop 437 for the outer sprocket. The pivotinglip 417 is located in a cutout defined byside walls bottom part 440 theside wall 439 having aninternal ramp portion 441 which also acts as a guide forfeed ramp 434. Ahole 442 in bothside walls axle 419 of the pivotinglip 417. Both sides of thefeed throat 415 havenotches 443 which, in operation, abut against respective stop pins in the well of the gun to limit the extent of insertion of the magazine into the receiver. - As shown in Figure 8B, the
internal diameter portion 428 has arecess 446 for co-operating with alatch 447 provided on the outer sprocket. Alternatively, instead of a recess, an aperture could be provided. - Referring now to Figures 9A, 9B and'9C, the
outer sprocket 42 has atubular body 448 withflanges serrations 451 in which are located, between theflanges flange 449 have a greater radial extent than those inflange 450. Thebody 448 has a reduceddiameter portion 452 which sits within theinternal diameter portion 428 of the housing and a concentric bearing surface 453 which engages the internal side of theprotrusion 430. Thebody 448 has afeed aperture 454 to permit cartridges from the intermediate and inner sprockets to pass therethrough. Thefeed aperture 454 has feedramps 455, 455' and aguide ramp 456 arranged to tilt the cartridge so that the bullet portion is inclined outwardly of thefeed aperture 454. Located in the reduceddiameter portion 452 is astop 457 presenting astop surface 458 for contacting thestop 437 of the housing and afurther stop surface 459 for co-operating with a stop on the intermediate sprocket. The wall of theportion 452 has anaperture 460 shaped to house thelatch 447 and to form alip 461 against which a claw on alatch 462, connected to the intermediate spool, co-operates. Transversely to theaperture 460 is ahole 463 in a boss for a pin pivotally locating thelatch 447. The reduceddiameter portion 452 is arranged to locate the neck of a cartridge so as to maintain the cartridge with the required amount of tilt in the magazine. Thelatch 447 is bent into the shape of a dog leg so that it is able to overlap thelatch 462. - The
intermediate sprocket 43, shown in Figures 10A, 10B and 10C, is similar to theouter sprocket 42 and has abody 464 with a reduceddiameter portion 465 andserrated flanges flange 466 is greater than that of those inflange 467 for the reason discussed earlier. The end face of the reduceddiameter portion 465 has abearing surface 468 for rotating on thesurface 430 of the housing and a recessedannular part 469, the inner periphery of which acts as a concentric guide surface to abut theinner side 445 of the housing. The intermediate sprocket has afeed aperture 470 havingfeed ramps 471, 471' and in which is disposed acartridge 499 that is tilted by aguide ramp 472, as described in relation to theouter sprocket 42. The guide ramp 471' extends interiorally of thebody 464. Astop 473 having astop surface 474 for contacting thestop 459 on theouter sprocket 42 is provided on the reduceddiameter portion 465 and in the side wall of the reduceddiameter portion 465 is anaperture 475 for thelatch 462 and ahole 476 is provided in a boss for a pin locating thelatch 462. - The
inner sprocket 44, shown in Figures 11A and 11B, has a body 477' withserrated side flanges rectangular aperture 403 within which one end of thespring 46 is located. The radial extent of the serrations in'flange 477 is greater than that in theflange 478 to tilt the cartridge (shown in phantom lines). In the position between which cartridges C1 and C25 (shown in phantom lines) are located is anotch 479 in thearm 477 within which therod 407 of the pusher is locatable. Ahole 480 is provided in each of thearms spindle 405 of the pusher. - The
latches respective pivot 481 and both biassed by arespective torsion spring 482, one end of which engages with an edge ofslot tang latches latches finger 485i 486 respectively and aprotruding ear ear 487 engaging with alip 489 on therecess 446 of thehousing 40 and theear 488 being arranged to engage with thelip 461 on the outer sprocket 42 (as shown in Figure 6). Thefingers tangs rod 407 of thepusher 47 respectively. - Referring now to Figures 12A, 12B and 12C, the cover 4l is a moulding made from clear plastics having a circular shape with six
holes 490 located in protrusions of the cover for securing the . cover to thehousing 40. The cover has anaxial hole 491 formed withnotches 492 which act as a keyway for thespindle 45 and prevent thespindle 45 from rotating. The region surrounding thehole 491 is dished to provide a recess for the head ofscrew 401 and the underside of the cover hasconcentric ring slots flanges slots ribs 411 with aroot radius 412 between the ribs and the planar part of the cover. The cover has aneck 495 corresponding in part to theneck 416 of the housing and positioned partially down the neck and extending toward thehole 491 is aguide cover 496 which is chamfered toward the cover outer surface (as best shown in Figure 7B) to guide theactuator 48 in and out of the housing. Theregion 497 on each side of theribs 411 is relieved to provide an improved depth of theribs 411 upon which a keyway on the gun receiver may engage and because ofslots arcuate apertures 498 are formed. Theguide cover 496 is recessed to provide a slot 496' of such depth that thecover 496 clears a normally provided last round stop in the gun receiver. The confluence of therelieved portion 497 and the thickened portion of the cover has a bevelled edge 497' to ease the location of the magazine onto the receiver keyway. Theneck 495 is of such a length that it partially covers a top most cartridge to prevent the cartridge from moving rearwardly. Holes 490' are provided on theneck 495 within which thepins 426 on the housing are located and a protruding pin 491' extending on the underside of the cover forms part of the feed ramp for the cartridges. A water drain hole 492' is provided on the inside surface of the cover. - In the position shown in Figure 3A, the
latches fingers fingers - In operation, the
spring 46 drives the sprockets in an anti-clockwise direction (as viewed in the Figures 3A, 4, 5A and 6) so that starting with the magazine fully loaded, as shown in Figure 3A, cartridge C2-pushes onfinger 486 which, becauselatch 462 is connected bypivot 481 to theintermediate sprocket 43, causessprocket 43 to rotate in an anti-clockwise direction. The turning effort ofintermediate sprocket 43 is, thus, applied to cartridge C28 which, in turn, applies a pressure throughfinger 485 oflatch 447 to theouter sprocket 42 which, thus, also is rotated in an anti-clockwise direction. - The rotation of the
outer sprocket 42 causes cartridge C98, located in a serration of theflanges throat 415 of the magazine by thelips lips - When the magazine is inserted into a gun magazine well (as shown in Figure 5B) the magazine is held in position by pins (shown in phantom lines) which locate in the
holes 423. Assuming that the bolt has been cocked, then on releasing the gun trigger the bolt moves forwardly toward the barrel and a stripping lug associated with the bolt slidingly removes the cartridge C100 i from thelips spring 46 on the sprockets, so the sprockets rotate in an anti-clockwise direction and cartridge C99 is moved upwardly to be held by thelips flanges ramps 434. This action continues until theouter sprocket 42 has given up all of its cartridges C98 - C60 and thestop surface 458 onouter sprocket 42 contacts stop 437 on the housing 40 (as shown in Figure 3C). The positions of thestops feed ramps 455' and 455 respectively of theouter sprocket 42. Whilst the outer sprocket was rotating and when cartridges C64, C63, C62 are de-nested and move up theramp 434, so thelatch 447, which has heretofore been held depressed by cartridges C64, C63, C62 is released and is biassed byspring 482 so that theear 487 abraids theinternal diameter portion 427 of the housing and continued rotation is such that when thestop surface 458 abuts stop 437 so theear 487 engageslip 489 and theouter sprocket 42 is prevented from rotating clockwise. The parts of the magazine are, thus, in the position shown in Figure 4. - Continued feeding of the cartridges from the feed lips causes those cartridges on the
intermediate sprocket 43 to be expended and the arrangement to adopt the position shown in Figure 5A with the cartridge C30 being scooped by ramp 455' to move up the feed ramps 455', 455. Continued rotation of theinner sprocket 44 causes thestop surface 474 to stop 473 on theintermediate sprocket 43 to abut thestop surface 459 on the outer sprocket (as shown in Figure 3C) and the feed ramps 471', 471 of theintermediate sprocket 43 to align with the feed ramps 455', 455 respectively of the outer sprocket 42'(as shown in Figure 6) and thelatch 462 is spring biassed so that theear 488 engages with thelip 461 on theouter sprocket 42. - Continued release of the cartridges causes further rotation of the
inner sprocket 44 so the cartridges C24 - C1 pass up the feed ramps 471', 471, 455', 455, 434 and 441 and because there are no further cartridges to push cartridges C6 - C1 up the feed ramps so therod 407 of thepusher 47 is scooped up by the feed ramp 471' to push these cartridges up to the feed lips, the length of thearm 406 being such that the rod is able to extend to thefeed lips 417, 418 (as shown in Figures 7A and 7B). Connected at one side of thearm 416 is the lastround stop actuator 48 and as thepusher 406 extends up the feed ramp so thespring arm 413, which is biassed against theguide cover 496 on thecover 41, moves with the arm upwardly and outwardly through the slot 496' in the cover. Until the pusher starts to move, the lastround stop actuator 48 is mounted alongside theU-shaped arm 406 of the pusher. The action of the last roundstop actuator button 414 is to move a bolt latch in the gun to latch the bolt assembly in an open position so that when the next magazine is inserted in the gun the bolt is already cocked. - To load the magazine, cartridges are inserted through the
feed throat 415 in a direction perpendicular to the housing axis so that the cartridges are inserted into theupper surface 421 of the spring biassed pivotinglip 417 and downward pressure on the cartridges causes thepusher 407 to be partially depressed and thelip 417 to be rotated to the position shown in solid lines in Figure 5B. After loading six cartridges thepusher 47 is laid in its rest position on the inner sprocket and the insertion of further cartridges cause the cartridge C1 to be nested in the first of the serrations on theinner sprocket 44. The action of depressing thepusher 47 is, of course, against the force exerted byspring 46 and as the cartridges C1 - C24 are nested in their associated serrations so theinner sprocket 44 is rotated in a clockwise direction. When cartridge C30 is inserted in to the feed lips thepusher tail 408contacts tang 484 on thelatch 462 and thereby rotates thelatch 462 so that theear 488 is dis-engaged from thelip 461. Theintermediate sprocket 43 is, thus, free to rotate in a clockwise direction and,with the -insertion of cartridges C31 and C32,adopts the position shown in Figure 5A. Referring to Figure 5A, the insertion of cartridges C31 and C32 causes cartridges C28, C29 to depress thelatch 462 so that thefinger 486 is inserted between the cartridges C2, C3 (see Figure 4). Continued clockwise rotation of theintermediate spool 43 andinner spool 44 causes thelatch 462 to be fully depressed by cartridges C30, C29, C28 and thefinger 486 to be firmly pushed between cartridges C2, C3, and to bear against cartridge C2. - The function of the
finger 486 is as follows: - With the parts shown in the positions of Figure 5A the
spring 46 exerts a pressure through cartridges C24, C25 and C26, causing cartridge C26 to be forced against the inner wall of theouter sprocket 42, thus resulting in undesirable friction. However, with the downward pressure of cartridge C30 on thelatch 462, as shown in Figure 4, sofinger 486 pulls cartridge C2 and, thus, theinner sprocket 44 in a clockwise direction relative to theintermediate sprocket 43. In this manner, the pressure fromspring 46 upon cartridges C24, C25, and C26 is released and the cartridges C25, C26 have a small amount of freedom within the feed ramps 471' and 471 and the forementioned undesirable friction is removed. - Continued feeding of cartridges into the
feed throat 415 causes bothinner sprocket 44 andintermediate sprocket 43 to be rotated in a clockwise direction until cartridge C26 is rotated so that it abuts thetang 483 onlatch 447. Thelatch 447 is, thus, rotated against the bias of its associatedspring 482 so that theear 487 is moved out of abutting contact with thelip 489 and, thus, permitting theouter sprocket 42 to rotate in a clockwise direction. The position shown in Figure 4 is where the cartridge C26 is about to abut thetang 483. Continued filling with cartridges is such that the cartridges C64, C63, C62 force thefinger 485 oflatch 447 to pull'the cartridge C28 in a clockwise direction and, hence, theintermediate sprocket 43 is moved in a clockwise direction relative to theouter sprocket 42"and the cartridges C57, C58 and C59 are freed from a tight fit against one another, in similar manner to the action offinger 486 upon cartridges C24, C25 and C26. Thus, the cartridges C58 and C59 have a small degree of freedom within the feed ramps 455' and 455 and undesirable friction between C59 and the inner wall of thehousing 40 is eliminated. Thus, all of the cartridges in the magazine are loosely held in the serrations or feed ramps and frictional forces are reduced to a minimum. The magazine is completely filled by inserting cartridges up to C100 and the magazine is then in the position shown in Figure 3A. - It is to be understood that the provision of the
latches ears lips sprockets feed throat 415. Secondly, thefingers latch 447 and from the inner sprocket to the intermediate sprocket through thelatch 462 respectively, thereby enabling all of the cartridges in the magazine except cartridges C100, C99 to have a small amount of freedom of movement within the magazine. Having described the function and operation of the latches, it will be realised by those srilled in the art that latches having similar functions, although possibly requiring differing components to perform each of the two functions could be designed, with advantage, for use with the Soumi-type magazine. - Referring now to Figure 17, there is shown an alternative form of Last round stop actuator in which a compression spring 413' and 414' are inserted in a bore of the
rod 407. The action of the plurger 414' is such that as therod 407 moves up the feed ramp so the plunger 414' is extended by the force of spring 413' and whe: thearm 406 is fully extended so the plunger 414' abuts the las. round stop mechanism in the gun receiver.
Claims (43)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT80304480T ATE13591T1 (en) | 1980-12-11 | 1980-12-11 | DRUM MAGAZINE FOR A FIREARM. |
EP19800304480 EP0054089B1 (en) | 1980-12-11 | 1980-12-11 | Drum magazine for a gun |
EP19840101403 EP0123798B1 (en) | 1980-12-11 | 1980-12-11 | Drum magazine for a gun |
DE8484101403T DE3072102D1 (en) | 1980-12-11 | 1980-12-11 | Drum magazine for a gun |
DE8080304480T DE3070718D1 (en) | 1980-12-11 | 1980-12-11 | Drum magazine for a gun |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19800304480 EP0054089B1 (en) | 1980-12-11 | 1980-12-11 | Drum magazine for a gun |
GB8039745 | 1980-12-11 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84101403.8 Division-Into | 1980-12-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0054089A1 true EP0054089A1 (en) | 1982-06-23 |
EP0054089B1 EP0054089B1 (en) | 1985-05-29 |
Family
ID=26080007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19800304480 Expired EP0054089B1 (en) | 1980-12-11 | 1980-12-11 | Drum magazine for a gun |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0054089B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6408837B1 (en) * | 1999-09-13 | 2002-06-25 | Johnson Research & Development Co. | Toy gun with magazine |
CN113338592A (en) * | 2020-03-03 | 2021-09-03 | 广东博智林机器人有限公司 | Drum magazine device and leveling robot |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE44923C (en) * | F. MANNLICHER in Wien | New to cylinder lock rifles with drum magazines | ||
BE441561A (en) * | 1939-10-14 | |||
GB191309478A (en) * | 1913-04-22 | 1913-09-18 | Oliver Imray | Improvements in or relating to Automatic Pistols. |
FR491235A (en) * | 1918-08-10 | 1919-05-27 | Aubert Freres Soc | Magazine for automatic revolvers |
CH110768A (en) * | 1923-10-04 | 1925-07-01 | Dansk Rekylriffel Syndikat As | Drum-shaped cartridge magazine for machine guns. |
GB463691A (en) * | 1935-10-02 | 1937-04-02 | Latham Valentine Stewart Black | Improvements in and relating to ammunition magazines for small arms, light automatic guns, or the like |
DE649860C (en) * | 1937-09-04 | Mauser Werke Ag | Medium shaft magazine, especially for self-loading weapons | |
GB472784A (en) * | 1936-11-17 | 1937-09-30 | Oskar Alfred Ostman | Machine gun magazines |
GB535325A (en) * | 1939-01-31 | 1941-04-04 | Melvin Maynard Johnson Junior | Improvements in firearms |
US2321720A (en) * | 1941-05-13 | 1943-06-15 | Automatic Appliance Corp | Magazine for firearms |
CH237418A (en) * | 1943-10-01 | 1945-04-30 | Oerlikon Buehrle Ag | Ammunition magazine for automatic firearms. |
US2585738A (en) * | 1949-12-13 | 1952-02-12 | Savage Arms Corp | Cartridge guide device for repeating firearms |
US2715290A (en) * | 1949-04-21 | 1955-08-16 | Earle M Harvey | Magazine for automatic firearms |
US3239959A (en) * | 1964-03-24 | 1966-03-15 | Sturm Ruger & Co | Removable magazine for repeating gun |
-
1980
- 1980-12-11 EP EP19800304480 patent/EP0054089B1/en not_active Expired
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE44923C (en) * | F. MANNLICHER in Wien | New to cylinder lock rifles with drum magazines | ||
DE649860C (en) * | 1937-09-04 | Mauser Werke Ag | Medium shaft magazine, especially for self-loading weapons | |
GB191309478A (en) * | 1913-04-22 | 1913-09-18 | Oliver Imray | Improvements in or relating to Automatic Pistols. |
FR491235A (en) * | 1918-08-10 | 1919-05-27 | Aubert Freres Soc | Magazine for automatic revolvers |
CH110768A (en) * | 1923-10-04 | 1925-07-01 | Dansk Rekylriffel Syndikat As | Drum-shaped cartridge magazine for machine guns. |
GB463691A (en) * | 1935-10-02 | 1937-04-02 | Latham Valentine Stewart Black | Improvements in and relating to ammunition magazines for small arms, light automatic guns, or the like |
GB472784A (en) * | 1936-11-17 | 1937-09-30 | Oskar Alfred Ostman | Machine gun magazines |
GB535325A (en) * | 1939-01-31 | 1941-04-04 | Melvin Maynard Johnson Junior | Improvements in firearms |
BE441561A (en) * | 1939-10-14 | |||
US2321720A (en) * | 1941-05-13 | 1943-06-15 | Automatic Appliance Corp | Magazine for firearms |
CH237418A (en) * | 1943-10-01 | 1945-04-30 | Oerlikon Buehrle Ag | Ammunition magazine for automatic firearms. |
US2715290A (en) * | 1949-04-21 | 1955-08-16 | Earle M Harvey | Magazine for automatic firearms |
US2585738A (en) * | 1949-12-13 | 1952-02-12 | Savage Arms Corp | Cartridge guide device for repeating firearms |
US3239959A (en) * | 1964-03-24 | 1966-03-15 | Sturm Ruger & Co | Removable magazine for repeating gun |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6408837B1 (en) * | 1999-09-13 | 2002-06-25 | Johnson Research & Development Co. | Toy gun with magazine |
CN113338592A (en) * | 2020-03-03 | 2021-09-03 | 广东博智林机器人有限公司 | Drum magazine device and leveling robot |
CN113338592B (en) * | 2020-03-03 | 2022-04-01 | 广东博智林机器人有限公司 | Drum magazine device and leveling robot |
Also Published As
Publication number | Publication date |
---|---|
EP0054089B1 (en) | 1985-05-29 |
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