Patent ID: 8556534
Filing Date: 2013-10-15
Classification: E02F,Y10T

Abstract:
1. An attachment coupler for heavy machinery, which is capable of detachably coupling an attachment to an arm of the heavy machinery, comprising: a coupler body configured to be coupled to the arm of the heavy machinery; a fixed hook configured to be formed on the coupler body and coupled to the attachment via a first coupling pin of the attachment which is inserted thereinto; a movable hook configured to be rotatably coupled to the coupler body via a hinge axis and coupled to the attachment via a second coupling pin which is inserted thereinto; a hydraulic cylinder configured to rotate the movable hook to be coupled to or disengaged from the second coupling pin; and a locking device configured to comprise a locking hook and an engagement device, wherein the locking hook is configured to be rotatably coupled to the coupler body via a hinge axis and close an open end of the fixed hook while being coupled to the first coupling pin; the engagement device is configured to physically contact the movable hook so that the rotation of the movable hook rotates the engagement device, the rotation of the engagement device causing the locking hook to be coupled to or disengaged from the first coupling pin; and the engagement device is configured to prevent the locking hook from disengaging the first coupling pin while the movable hook is coupled to the second coupling pin.