Roof bolt with helical coil and bail anchor
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United States of America Patent
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-
Aug 27, 1991
Grant Date -
N/A
app pub date -
Jun 15, 1989
filing date -
Jun 15, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mine roof anchor assembly usable with a quick-setting resin cartridge inserted into a mine roof opening includes a partially threaded elongated bolt having a head at one end, a bail-type mechanical anchor at the threaded end, and an elongated helical coil having an upper end attached to the bolt and positioned external of and surrounding a substantial length along the bolt. A bearing plate and a two-faced washer can be positioned on the bolt head. Both sides of the washer may be coated with a dry lubricant such as graphite suspended in a resin base.
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Cited Art Landscape
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