Anti-lightning strike fasteners for composite material aircraft
structures
    23.
    发明授权
    Anti-lightning strike fasteners for composite material aircraft structures 失效
    用于复合材料飞机结构的防雷击扣

    公开(公告)号:US4891732A

    公开(公告)日:1990-01-02

    申请号:US126332

    申请日:1987-11-30

    CPC classification number: F16B37/044 B64D45/02

    Abstract: A fastener for use with aircraft structures comprising composite materials has improved electrical characteristics designed to reduce damage by lightning strikes. The fastener comprises separate nut and bolt portions and a cage member (4, 1, 6). The nut (4) and the head portion of the bolt 1 both have beveled edges which in use are countersunk in the composite materials to enhance electrical contact between the fastener and aircraft structural members (2, 5). The nut (4) is captively mounted inside the cage member (6) and is moveable, within pre-determined limits, inside the cage (6) so that it may be axially aligned with and the bolt screwed therein, thus compensating for any initial non-aligment of the nut (4) and bolt (1) due to a complex shape of the aircraft structure necessitated by aerodynamic or other considerations.

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