Abstract: A rail segment for a rotating assembly of a machine is provided. The rail segment includes a first surface configured to face a support structure of the machine. The rail segment further includes a second surface configured to face a roller of the rotating assembly. The second surface includes an arcuate shape along a circumferential direction with respect to a rotation axis of the rotating assembly. Furthermore, the second surface is substantially parallel along a radial direction with respect to the rotation axis of the rotating assembly.

Abstract: A rail segment for a rotating assembly of a machine is provided. The rail segment includes a first surface configured to face a support structure of the machine. The rail segment further includes a second surface configured to face a roller of the rotating assembly. The second surface includes an arcuate shape along a circumferential direction with respect to a rotation axis of the rotating assembly. Furthermore, the second surface is substantially parallel along a radial direction with respect to the rotation axis of the rotating assembly.

Abstract: A mast head assembly for a dragline comprises an elongated body for connecting to a mast of a dragline. The elongated body includes side plates on opposite sides of the body. The side plates have suspension lugs and chord and lacing stubs for attaching cables from the mast head to the boom of a dragline. At least one of the cord stubs is located above and to the rear of a first chord stub. The chord and lacing stubs are positioned on the side plates so that the maximum stress in the mast head assembly is where the chord stub connects to the original chord. The highest remaining stress is located at the point where the upper/rear chord stub connects to the original chord.

Abstract: A swing drive assembly for use with a mining shovel having a frame rotatable relative to a base, wherein the swing drive assembly is fixed to the frame and engages a ring gear fixed to the base to rotatably drive the mining shovel frame relative to the mining shovel base. The assembly includes a swing girder having a top wall and bottom wall joined by a back wall. At least one strut having a top end extends upwardly from the top wall, and an attachment point is proximal said strut top end for fixing the swing drive assembly to the frame. At least one attachment point is proximal one end of the top wall, and at least one attachment point is proximal an opposing end of the top wall, wherein the girder is fixable to a mining shovel frame at each of the attachment points. Preferably, each attachment point is fixed to the mining shovel frame with at least one bolt. Most preferably, the swing girder is mounted to the frame, and hangs below the frame to engage the ring gear.

Abstract: A swing drive assembly for use with a mining shovel having a frame rotatable relative to a base, wherein the swing drive assembly is fixed to the frame and engages a ring gear fixed to the base to rotatably drive the mining shovel frame relative to the mining shovel base. The assembly includes a swing girder having a top wall and bottom wall joined by a back wall. At least one strut having a top end extends upwardly from the top wall, and an attachment point is proximal said strut top end for fixing the swing drive assembly to the frame. At least one attachment point is proximal one end of the top wall, and at least one attachment point is proximal an opposing end of the top wall, wherein the girder is fixable to a mining shovel frame at each of the attachment points. Preferably, each attachment point is fixed to the mining shovel frame with at least one bolt. Most preferably, the swing girder is mounted to the frame, and hangs below the frame to engage the ring gear.

Abstract: A roller circle for hoisting and excavating equipment has upper and lower spaced annular rails. A plurality of tapered rollers are disposed between the rails in rolling contact with bearing surfaces of the rails. Each of the rollers is mounted on a shaft. Inner and outer cages connect the projecting ends of the shafts and are joined together by through rods. A portion of the inner cage overlies a side face of a rail and a pad is disposed between the inner cage portion and the side of the rail. A second pad is disposed between the outer cage and the larger ends of the rollers. Thrust loads are transferred from the rollers to the outer cage and through the rods to the inner cage and then to the rail.