Arm assembly for excavation apparatus and method of using same

Abstract

An arm assembly for an excavator includes an arm comprising a first hook including a first open mouth. The arm further includes a first pin capturing system that selectively obstructs the first open mouth. A link is movable relative to said arm and comprises a second hook including a second open mouth. The second open mouth is oriented toward the arm, and the link further comprises a second pin capturing system that selectively obstructs the second open mouth. The first and second pin assemblies of an attachment are selectively captured in the first and second hooks. The pin assemblies include a sleeve rotatably positioned on an attachment pin that extends between ribs of the attachment. The sleeve includes a bore that closely receives the attachment pin and the length of the sleeve is selected so that the sleeve fits closely between the attachment ribs, thereby allowing the arm assembly to pick-up various attachments with different pin diameters, ribs spacings and pin-to-pin distances. The arm assembly can be coupled to and decoupled from an associated attachment by an operator without assistance from a ground crew.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims benefit of the filing date of U.S. provisional application No. 60 / 391,062 filed Jun. 24, 2002 and U.S. provisional application No. 60 / 411,181 filed Sep. 16, 2002, and both of said applications are hereby expressly incorporated by reference herein.BACKGROUND OF THE INVENTION [0002] The present invention relates generally to construction, excavation and / or other heavy machinery such as excavators, backhoes and the like that include an arm assembly comprising an arm or “stick” and a control link, each or which is adapted for pivotable connection to an associated attachment such as a bucket or other implement for performing work, and all such machines are referred to herein as “excavation apparatus” of “excavators.” The control link is operably coupled to a hydraulic cylinder or other actuator, and the position of the control link as controlled by the actuator controls the angular position of the attachment relative ...

AI Technical Summary

Problems solved by technology

However, given the size and weight of the attachments, and the close tolerances of all connection points, changing of attachments at the end of the arm of an excavator has been found to be time-consuming, difficult and inconvenient.

Although these quick-couplers are highly effective and convenient, they add weight to the excavator arm and also elongate the arm, the combination of which can lead to a decrease in excavator performance in certain circumstances.

The additional weight of the quick coupling can decrease the lifting capacity of the excavator.

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