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1. 发明授权

US3703219A Manhole ladder step unit 失效
标题翻译： MANHOLE梯子步骤单元
公开(公告)号：US3703219A
公开(公告)日：1972-11-21
申请号：US3703219D
申请日：1971-03-16
申请人： PRODUCTS CORP CONST
发明人： JONES DAVID P
IPC分类号： E06C9/04
CPC分类号： E06C9/04
摘要： A non-metallic manhole ladder step unit of high-strength plastic molding composition, having spaced cantilevered side beams to be embedded in a wall and a cross beam to form a ladder step. High strength and good molding characteristics are obtained by forming the beams with longitudinal walls which are vertically deep but transversely thin, joined in an inverted-U or other mutually reinforcing relation. For best characteristics, a thermosetting molding composition is used, containing at least 20 percent and preferably 30 to 50 percent reinforcing glass fiber, 25 to 60 percent mineral filler, preferably hydrated alumina, and 20 to 50 percent thermosetting resin, such as polyester or epoxy resin. Thermoplastic compositions, especially high temperature compositions containing glass fiber reinforcement, may also be used when lower strength and flame characteristics are acceptable.
摘要翻译：一种高强度塑料成型组合物的非金属试井阶梯单元，其具有嵌入壁中的间隔悬臂梁和横梁以形成梯阶。通过形成具有垂直深度但横向薄的纵向壁的梁来获得高强度和良好的成型特性，以倒U形或其他相互增强的关系连接。为了获得最佳特性，使用热固性模塑组合物，其含有至少20％，优选30-50％的增强玻璃纤维，25-60％的矿物填料，优选水合氧化铝，以及20-50％的热固性树脂，如聚酯或环氧树脂树脂。当低强度和火焰特性是可接受的时，也可以使用热塑性组合物，特别是含有玻璃纤维增强材料的高温组合物。

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