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    • 1. 发明授权
    • Break-resistant telescoping tool
    • 防爆伸缩工具
    • US4047821A
    • 1977-09-13
    • US732056
    • 1976-10-13
    • Jack B. HokeRichard GrahamRichard H. Hoffman
    • Jack B. HokeRichard GrahamRichard H. Hoffman
    • B25G1/04F16B7/10F16B7/12H02G1/02
    • B25G1/04F16B7/105H02G1/02Y10T24/4718Y10T403/32483Y10T403/604
    • An elongated, lightweight, insulative, multi-section, break-resistant telescoping tool especially adapted for work around energized electrical lines is disclosed which overcomes breakage problems heretofore encountered in tools of this type by provision of closely fitting, reciprocable, telescoping sections having imperforate bases which preclude air flow centrally through the sections to thereby prevent the quick escape of air from adjacent, surrounding sections during nesting retraction of the tool which serves to cushion such retractive movement and prevent inadvertant breakage of the sections. Spring-loaded buttons are provided for releasably securing the sections in an extended position and are formed of high-impact, shear-resistant deformable synthetic resin material so that the buttons can safely absorb shocks resulting from an accidental dropping of the tool without breakage of the tool sections or the buttons themselves. The tool sections advantageously include an outer tube formed of flexibilized epoxy resin and an inner fiberglass reinforced sleeve received within the tube and bonded thereto by means of a polyurethane foam which absorbs a portion of the transverse loads imposed iupon the sections by the buttons during an accidental dropping of the tool.
    • 公开了一种细长的,重量轻的,绝缘的,多截面的抗断裂伸缩工具,其特别适于在通电电线周围工作,其克服了迄今为止在这种工具中遇到的断裂问题,通过提供具有无孔基部的紧密配合的可往复运动的伸缩部分 其排除空气在中心通过这些部分,从而防止空气从邻近的周围部分快速逸出,以便在工具的嵌套收回期间缓冲这种回缩运动,并防止部分的不经意的破损。 提供弹簧加载的按钮用于将部分可释放地固定在延伸位置并且由高冲击,抗剪切的可变形合成树脂材料形成,使得按钮可以安全地吸收由于工具的意外掉落而引起的冲击而不会破坏 工具部分或按钮本身。 工具部分有利地包括由柔性环氧树脂形成的外管和容纳在管内并通过聚氨酯泡沫结合到其上的内玻璃纤维增​​强套管,其吸收在意外期间由按钮施加的部分的横向负载的一部分 丢掉工具。