Coated washer for an anchor bolt system

Hydraulic and earth engineering – Earth treatment or control – Chemical

Patent

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Details

405260, 405259, 411534, 411428, 411903, E21D 2002

Patent

active

049849387

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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