The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1981
Filed:
Mar. 26, 1979
Maurice I Zeldman, Pittsburgh, PA (US);
Bucyrus-Erie Company, South Milwaukee, WI (US);
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.