Machine gun |
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| 申请号 | US3756119D | 申请日 | 1971-12-14 | 公开(公告)号 | US3756119A | 公开(公告)日 | 1973-09-04 |
| 申请人 | COLT IND OPERATING CORP; | 发明人 | CURTIS G; TATRO H; | ||||
| 摘要 | The machine gun of this invention features a unitary bolt and bolt drive assembly reciprocably mounted within a receiver along three longitudinally extending bearing supports symmetrically arranged in spaced relation to the receiver; the bolt and bolt drive assembly, together with a recoil buffer constituting an integral operating group removably maintained within the receiver by a single latch mechanism; a bolt carrier of the assembly incorporating actuating means for cartridge belt advance, cartridge extraction and ejection; the bolt carrier housing not only a rotary, front-locking bolt but also a cam follower which fixes a firing pin to the carrier and moves within a contoured slot in the bolt for locking and unlocking it in battery. This machine gun also features a gas recoil system for the bolt and bolt drive assembly having anti-fouling porting means for purging gas from the system under high pressure after firing; an ejector operated by the recoiling bolt and bolt drive assembly independently of its velocity; an automatically engageable, selfaligning barrel and receiver latch construction; and a sight assembly featuring a zero backlash precision screw adjustment means. | ||||||
| 权利要求 | 1. A machine gun comprising a receiver, bolt means longitudinally reciprocable in the receiver between first and second limit positions, an ejector lever pivotally supported on the receiver for angular movement about a pivot axis for positively ejecting therefrom extracted cartRidges carried by the bolt means, an ejector actuator on the bolt means, a pivotable ejector crank supported on the receiver for angular movement about said pivot axis of the ejector lever and drivingly connected to the ejector lever, the ejector crank disposed in the path of movement of the ejector actuator intermediate the limit positions of the bolt means, means limiting relative angular movement between the lever and its crank, and biasing means continuously urging the lever and its crank in opposite angular directions, the biasing means resiliently maintaining the lever and its crank in direct driving relation for directly driving the lever in one angular direction for cartridge ejection in timed relation to bolt means movement in one linear direction while permitting free travel of the crank in the opposite angular direction and automatic re-engagement thereof with the lever responsive to bolt means movement past the crank in the opposite linear direction. 2. The gun of claim 1 wherein the receiver includes a bottom ejection port, and wherein the ejector lever is mounted above the ejection port for pivotable movement toward and away from the same. 3. The gun of claim 1 further including means on the receiver for locating the ejector lever and its crank in operative position for actuation by the ejector actuator, wherein the crank and its lever each have a pivot shaft coaxially supported on the receiver in driving relation with one another with a limited freedom of relative angular movement, and wherein the biasing means includes a single torsion return spring connected to the lever and the crank and coiled about the pivot shaft of one of said members, the return spring having a portion engaging the receiver for returning the lever and its crank to said operative position after cartridge ejection. |
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