Importance

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Abstract

An anchoring assembly and method for securing a threaded elongate member such as a bolt or screw in a material engaging position in a preformed hole in a relatively frangible material. The anchoring assembly is formed of a threaded elongate member and coil surrounding and engaging at least some of the threads of the elongate member and extend beyond the outer transverse boundary of the elongate member. The elongate member is formed with a reduced diameter preferably tapered entry end, a threaded body portion, and preferably a headed head end. The coil is formed of a uniform cross-section wire having a diameter permitting the coil to seat on the threaded body portion of the elongate member. An anchoring tab or tang having a thickness less than the diameter of the wire forming the coil is formed on at least one end of the coil with a thickness preferably between 90% and 110% of half the difference in diameter between the maximum outer diameter of the elongate threaded member and the outer diameter of the coil. In use, the coil with the tang extending towards the head end of the threaded member is threaded over the entry end of the threaded member. A hole of a diameter between 95% of the outer diameter of the threaded member and 99% of the outer diameter of the coil is formed in the material in which the threaded member is to be secured and the assembled coil and threaded member are driven into the hole to a depth equal to the length of the threaded member minus the distance between the head of the threaded member and the top of the coil, after which torqueing the threaded member in the coil expands the coil and anchoring tang into the side walls of the hole.

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First Claim