An improved friction washer

Details An improved friction washer An improved friction washer

E - Fixed Constructions

21

D

E21D 21/00 (2006.01) E21D 11/00 (2006.01) E21D 11/15 (2006.01)

Patent

CA 2254302

An improved friction washer for securing a wire mesh screening on the protruding ends of rock bolts used for supporting rock in mine openings. The improved friction washer has a central opening which is deformed to fit onto the threaded section of a rock bolt and to then remain in position and thus securing the wire mesh against the rock surface. A plurality of formed loops are located on one face of the improved friction washer and radially spaced from the center of the central opening at a distance substantially equal to half the outside diameter of a hollow tube so as to allow the loops to fit over an installation tool for securing the friction washer during installation onto the protruding end of the previously installed rock bolt. An improved friction washer, also known as a gripper plate, with increased resistance to corrosion, an improved and simplified manufacturing process and greatly improved safety for workers when using this device for securing wire mesh onto rock bolts.

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