Extendible dipper with extruded portion for a backhoe arm

Abstract

The invention relates to an extendible dipper assembly (32) for a backhoe arm for a construction equipment machine, said arm comprising a boom to be attached to the machine, and an extendible dipper assembly (32) articulated at the free end of the boom (30) for holding a working 38 tool, said extendible dipper assembly (32) comprising a proximal part (34) articulated to the boom (30) and a distal part (36) which is slidingly connected to the proximal part so as to form a length-adjustable dipper assembly, characterized in that at least one of the dipper parts (34, 36) comprises a rectilinear profile made by extrusion of metal, said profile having a closed cross-section around at least one inner cavity.

Description

BACKGROUND AND SUMMARY[0001]The invention relates to the field of construction equipment machines having a backhoe arm where a part of the arm is extendible.[0002]Many construction equipment machines are equipped with a backhoe, that is a piece of equipment where a bucket is mounted at the end of an arm, the arm being itself mounted on a chassis of machine. The arm usually comprises at least a boom, which is articulated to the chassis through at least a horizontal axis, and very often also around a vertical axis, and a dipper which is articulated at the free end of the boom around another horizontal axis. The dipper may also be articulated with respect to the boom around a vertical axis. Each of these movements is controlled by a power cylinder, usually a hydraulic cylinder, respectively a boom cylinder for controlling the movement of the boom relative to the chassis and a dipper cylinder for controlling the movement of the dipper relative to the boom. The bucket is articulated to t...

AI Technical Summary

Benefits of technology

[0006]It is desirable to provide a new design of an extendible dipper asse

Problems solved by technology

This long known fabrication technique has proven successful but needs very careful welding operations.

Indeed, it is well known that welding operations, which involve localized heating and subsequent cooling of the portions to be assembled, tend to generated internal stresses in the final object which cause deformations of said object.

Such deformations are unacceptable when it is required that the object is to be joined to another object through a very precise sliding connection.

Therefore, such cautious welding operations which are necessitated with the known fabricating techniques of extendible dipper arms make them expensive.

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