Patent ID: 7753640
Filing Date: 2010-07-13
Classification: B66C

Abstract:
1. A boom foot pin attachment and detachment apparatus for construction machine, comprising: a bifurcated connection portion being formed on one of an upper rotating body and a boom foot, a flat plate connection portion inserted into said bifurcated connection portion being formed on the other, pin holes being provided in both said connection portions respectively, in a state that both said pin holes are aligned a boom foot pin being inserted into both said pin holes so as to detachably connect the boom foot with the upper rotating body; a cylinder bracket enabling said boom foot pin to move between an insertion position where said boom foot pin is inserted into said pin holes and a pull out position where said boom foot pin is pulled out from said pin holes, a base end of the cylinder bracket being attached to an inner piece of said bifurcated connection portion; a slide plate slidably provided on said cylinder bracket along the moving direction of said boom foot pin; a hydraulic cylinder, a cylinder main body thereof being attached to said slide plate and a piston rod thereof being connected to said boom foot pin; first regulating means connectable at a first position on said cylinder bracket for preliminarily regulating sliding of said slide plate when said boom foot pin is inserted from the pull out position into said pin holes by an extending action of said hydraulic cylinder; and second regulating means connectable at a second position on said cylinder bracket for preliminarily regulating movement of said boom foot pin from the insertion position when said hydraulic cylinder performs a contracting action after said boom foot pin is inserted into said pin holes by the extending action of said hydraulic cylinder.