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    • 79. 发明授权
    • Electrical outlet box with polygonal mounting bore
    • 带多边形安装孔的电源插座
    • US4666055A
    • 1987-05-19
    • US808817
    • 1985-12-13
    • Thomas E. Lewis
    • Thomas E. Lewis
    • F16B37/00H02G3/18F16B39/00
    • F16B37/005H02G3/18Y10S411/908
    • An electrical outlet box formed of nonmetallic material which has a pair of integral bosses that angularly align, engage and retain wiring device mounting screws therein. The bosses each have a through bore for receiving the screws comprising in sequence a frustoconical surface, a cylindrical surface having a diameter slightly larger than the crest diameter of the mounting screw threads, and a self-tapping surface defining a regular hexagon in transverse cross section. The hexagon has a diameter across its corners slightly larger than the crest diameter of the screw threads, and a diameter across its flat sides slightly larger than the root diameter of the screw threads and slightly smaller than the crest diameter of the screw threads.
    • 由非金属材料形成的电气插座盒,其具有一对整体的凸台,其在其中成角度地对准,接合和保持配线装置安装螺钉。 凸台各自具有用于接收螺钉的通孔,所述螺钉依次包括截头圆锥形表面,具有略大于安装螺纹的波峰直径的直径的圆柱形表面,以及在横截面中限定正六边形的自攻螺纹表面 。 六边形的直径跨越其角略大于螺纹的波峰直径,其平直侧的直径略大于螺纹的根部直径,并略微小于螺纹的螺纹直径。