Slope grader with longitudinally movable guide frame
OwnerAmerico Deaninventor
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Abstract
An attachment for a jib crane to enable it to be used for grading and carrying out other work on sloping banks has a more or less horizontal auxiliary jib mounted beneath the main jib of the crane, a carriage movable fore and aft along the auxiliary jib, a guide frame extending forwardly from the carriage, a tool carrier movable in either direction along the length of the guide frame, and a suspension tie connecting the guide frame to the jib of the crane. The tool carriage is provided with a scraper blade or other tool appropriate to an operation to be carried out, and is hauled, usually upwardly, along the guide frame by a cable operated by the winding gear of the crane.
Claims11
A grading attachment for a jib crane, comprising a substantially horizontal auxiliary jib mounted on the crane beneath its main jib, a carriage mounted for fore and aft movement along the auxiliary jib, an elongated guide frame supported by the carriage, said guide frame extending longitudinally forwardly from the carriage at an inclination thereto, and said guide frame having side rails passing through and slidably mounted in sleeves secured to said carriage whereby the guide frame is movable on its longitudinal axis relative to the carriage, a tool carrier mounted for movement in either direction longitudinally along the guide frame, an earthworking tool mounted to and beneath the carrier, and a suspension tie connecting the guide frame to the main jib of the crane.
Dependencies are inferred from the claim text.