Coated washer for an anchor bolt system
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United States of America Patent
Stats
-
Jan 15, 1991
Issued Date -
N/A
app pub date -
Sep 28, 1989
filing date -
Aug 25, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The anchor bolt assembly is of the tensionable type used in mine roofs and the like in which the anchor bolt assembly is positioned in a bore hole of a rock formation. The bolt assembly includes an elongated bolt shaft with a head at one end and is threaded on the other end and has a mechanical expansion anchor on the threaded end. A bearing having a central opening is positioned on the bolt to engage a face of the rock formation. A two faced graphite coated washer is positioned on the bolt between the bolt head and the bearing plate. During installation, the washer acts as an anti-friction bearing between the bolt head and the plate to improve the torque to tension relationship.
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