Importance

Loading Importance Indicators...

Abstract

A washer insert is made preferably of plastic for use with a bearing plate and a mine roof bolt. The bearing plate includes an upper surface, lower surface and a hole passing therethrough. The roof bolt includes a shaft having a head attached to the shaft. The outer diameter of the head is greater than the outer diameter of the shaft. The washer insert includes a hollow first section having a first end and an inner diameter equal to or greater than the outer diameter of the roof bolt shaft and less than the outer diameter of the roof bolt head. A flange attaches to the first end of the first section extending outwardly from the first section and coaxial with the first section. The flange has an upper surface and a lower surface whereby the first section is adapted to be received within the bearing plate hole so that the upper surface of the flange abuts against the lower surface of the bearing plate, the bolt shaft passes through the first section and the flange is sandwiched between the bolt head and the bearing plate.

Loading the Abstract Image...

First Claim