DRUM MAGAZINE FOR A GUN

摘要

DRUM MAGAZINE FOR A GUN A drum magazine for a gun has a circularly cross-sectioned housing (40) with a feed throat (415) extending from the housing for releasing cartridges and concentric sprockets (42, 43, 44) having serrations nesting cartridges. A torsion spring (46) is arranged to rotatingly drive the sprockets and feed ramps (434, 441, 455, 455', 471, 471') are provided for assisting the cartridges to traverse from the sprockets to the feed throat (415). In one aspect, a U-shaped pivotal pusher (47) is nested on the innermost sprocket (44) until de-nested by the feed throat ramp to push the last six cartridges to the feed lips (418, 417) terminating the feed throat (415). A last round stop actuator (48) is provided which travels with pusher (47). In another aspect of this invention one of the lips (417) is pivotally biassed to act as a one way valve such that in one position cartridges are prevented from being ejected in a direction perpendicular to the housing axis and yet cartridges may be inserted into the housing in a direction perpendicular to the housing axis. Another aspect of the invention provides a latch (487, 489) between the outer sprocket (42) and the housing (40) to prevent rotation of the outer sprocket in a counter direction to the direction of feeding cartridges out of the magazine until the intermediate sprocket (43) is rotated in said counter direction a predetermined amount. A feature provides a connector (485) which is connected to the outer sprocket (42) and which passes through the outer sprocket (42) to engage with the cartridges nested in the intermediate sprocket (43) so that by virtue of the connector the sprockets (42, 43) rotate together. A similar connector (486) is also provided between the intermediate sprocket (43) and the inner sprocket (44).