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    • 5. 发明授权
    • Security cone-door for a ladder
    • 梯子安全锥门
    • US08141682B2
    • 2012-03-27
    • US12462389
    • 2009-08-03
    • Ronald E. White
    • Ronald E. White
    • E06C7/00
    • E06C7/006
    • A first embodiment of the security apparatus comprises a retaining collar; a plurality of segments forming a generally frusta-conical enclosure, with one or more of the segments having an access opening therein; and a lockable access door covering the opening. The retaining collar is separable into portions that conforms to the shape of the periphery and are coupled together around the structure. The segments have an upper portion that attaches to the collar; and have a bottom portion that extends radically downwardly from the collar at an angle of about 30 degree; with the radial edges interconnected forming the enclosure.A second embodiment of the apparatus secures a ladder supported on a wall and a retaining bar; a plurality of segments forming a generally semi-frusta-conical enclosure, with one or more of the segments having an access opening therein; and a lockable access door covering the opening.
    • 安全装置的第一实施例包括保持环; 多个段,其形成大致截头圆锥形的外壳,其中一个或多个段在其中具有进入开口; 和一个覆盖开口的可锁门。 保持套环可分离成符合周边形状的部分,并且围绕结构耦合在一起。 所述片段具有附接到所述衣领的上部; 并且具有以约30度的角度从套环向下垂直延伸的底部; 其中径向边缘互连形成外壳。 装置的第二实施例确保支撑在墙壁和保持杆上的梯子; 多个段,形成大致半截头圆锥形的外壳,其中一个或多个段在其中具有进入开口; 和一个覆盖开口的可锁门。