Pivot pin assembly for shaker head

In a shaker head comprising a clamping arm and a stationary arm, wherein the clamping arm comprises a fixed end pivotally attached to the stationary arm, wherein the stationary arm is integral to a frame having a case structure comprising an upper plate and a lower plate, the upper plate and the lower plate in opposite facing relation, the upper plate having an upper plate aperture having an upper plate aperture diameter and the lower plate having a lower plate aperture having a lower plate aperture diameter, the clamping arm comprising a top surface and top surface aperture having a top surface aperture diameter, the clamping arm further comprising a bottom surface and a bottom surface aperture having a bottom surface aperture diameter, wherein the clamping arm is pivotally attached to the frame by a pivot pin assembly comprising:

• a cylindrical pivot pin having a cylindrical pivot pin diameter, the cylindrical pivot pin diameter larger than the upper plate aperture diameter and the lower plate aperture diameter but smaller than the top surface aperture diameter and the bottom surface aperture diameter, the cylindrical pivot pin further comprising a first end and a second end, the first end of the cylindrical pivot pin having a first end aperture wherein the cylindrical pivot pin is disposed into the top surface aperture with the first end extending above the top surface and the cylindrical pivot pin is disposed into the bottom surface aperture with the second end extending below the bottom surface;
• and
• a longitudinal load member which extends through the upper plate aperture and into the first end aperture wherein application of an axial load in the longitudinal load member compresses the upper plate against the first end of the cylindrical pivot pin without compressing the top surface.