| 摘要 |
A central support plank section is transversely secured to the floor of a helicopter cabin area at exterior side wall door openings on opposite sides of the cabin area. Specially designed pintle arm assemblies are rotationally secured to opposite ends of the central support plank sections, with each of the pintle arm assemblies underlying and operatively supporting a cabin door area machine gun. Each pintle arm assembly is pivotable about a vertical axis in a manner permitting its machine gun to be horizontally swung into the cabin area to a stowed orientation therein, and is provided with a lock ring/detent structure that permits the pintie assembly to be quickly and easily locked in a selectively variable horizontal rotational orientation. An inboard post portion of the pintle arm assembly is rotatably secured to the central plank section by a specially designed securement structure that substantially reduces both rotational friction and horizontal and vertical "play" of the post portion at its juncture with the central plank section. An outboard post portion of the pintle arm assembly is spaced apart from the inboard post portion and is removably and rotatably connectable to its associated machine gun. In three disclosed embodiments thereof, the outboard post portion is (1) permanently secured to the balance of the pintle arm assembly, (2) a straight cylindrical post member removably received in a socket portion of the assembly, and (3) a tapered cylindrical post member removably received in a correspondingly tapered socket portion of the assembly.
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