Importance

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Abstract

A front end mechanism for an excavating machine is shown having a boom pivotally mounted at its foot and a dipper stick pivoted to the forward end of the boom that carries a dipper at its outer end. The mechanism includes a rotatable hoist member coaxial with the pivoted boom foot that is in the form of either a gear or a lever arm, a hoist drive that alternately rotates the hoist member for effecting hoist and lower motions of the machine or that holds the hoist member stationary, a moment arm forming a part of the inner end of the dipper stick which is in the form of either a gear or a linear portion of the dipper stick, a coupling member interposed between the hoist member and the dipper stick moment arm which is in the form of either an elongate strut tying the hoist member and moment arm together or an idler gear when both the hoist member and the moment arm are in the form of gears, and a crowd drive that can alternately pivot the boom with respect to the hoist member or hold these two elements fixed with respect to one another.

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First Claim