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MINE ROOF ANCHOR ASSEMBLY HAVING AN EXPANSION SHELL ASSEMBLY WITH A FRICTION REDUCING MEANS
MINE ROOF ANCHOR ASSEMBLY HAVING AN EXPANSION SHELL ASSEMBLY WITH A FRICTION REDUCING MEANS
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机译:矿山顶板锚固组合件具有减摩措施的膨胀壳组合件
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摘要
A mechanical expansion shell assembly has an expansion shell with a plurality of leaves and a plug with a plurality of sloped surfaces. The inner surfaces of the leaves are positioned in overlying relation with the sloped surfaces of the plug. A friction reducing material is positioned between the overlying surfaces and is arranged to reduce the torque applied to the roof bolt connected to the expansion shell assembly to obtain a preselected lateral force on the expansion shell leaves. In another embodiment, a friction reducing material is positioned between a nut threaded on the roof bolt and the underside of the expansion shell ring portion.
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