Abstract: An improved walking mechanism for a drag line excavator. The drag line excavator has a tub intended to rest upon ground with a house and boom rotatable on the tub. Movement of the excavator is accomplished by large spuds at each side of the house each carrying an elongate shoe for ground contact when the spud is lowered by a crank to raise a part of the machine off the ground and drag the rest over the ground in incremental "steps" to move the excavator. The present invention provides a structure allowing the machine to pick up a greater proportion of the excavator weight relative to the weight to be dragged over the ground without changes in the walking mechanism power and drive and without changes affecting the location of the walking center of gravity or the working center of gravity of the excavator.

Abstract: A dragline is constructed in the manufacturing plant with a segmented guide rail shimmed and secured to the plates of a tub concentric with the pintle for the deck. The guide rail is then machined so that a rolling surface is created on the rail that is within .+-.0.002 inches of a planar surface. Tub gear segments have mounting portions accurately machined and accurately drilled as are tub rail segments and deck rail segments accurately machined. The dragline is then disassembled, shipped to the site and re-erected with the guide rail shimmed and installed on the plates of the tub so that the rolling surface is within .+-.0.002 inches of a plane. The deck is mounted on the pintle and supported on columns to space the deck rail girder from the tub rail girder. A tram or boom is mounted on the deck pintle and has a machine tool carriage riding on the guide rail so that a milling head on the carriage can mill the upper and lower rail girders to within .+-.0.0025 inches of planar.

Abstract: An earth digging bucket toothpoint construction with a tooth base having a tooth holder removably attached thereto and a toothpoint removably secured to the tooth holder in which an internal rib structure on noses of the interfitting parts with mating grooves in the interfitting parts of a particular specified size increases the section modulus against bending stresses to increase the bending strength of the noses against breakage.

Abstract: An indicating device including an indicator having a plurality of information bearing surfaces adapted to be movable from a first position to a plurality of second positions. The indicating device includes an armature member coupled to the indicator and adapted to pivot about an axis with the armature member having a plurality of radially extending armature pole pieces disposed at its opposite ends. A stator member having a plurality of pole pieces disposed adjacent each armature pole piece and in a spaced apart relation therefrom such that when the armature member pivots about is axis, one of the armature pole pieces rotates toward one of the stator pole pieces, and the other of the armature pole pieces rotates away from the other of the stator pole pieces.

Abstract: A boom point assembly is provided with a sheave or sheaves that are swivel mounted to allow the sheaves and the cables supported thereby to swing sidewise relative to the centerline of the boom without applying substantial twisting forces on the boom and without causing undue wear on the sheaves or on the cables. The cross-shaft or pin for supporting the sheave or sheaves is mounted in the side cheeks of the boom point assembly with the axial thrust from the sheave bearings and mount being transverse to the cross-shaft or pin and being transmitted through a support pylon to the chords of the boom frame.