Patent ID: 7743881

Claim:
A vibration damping device comprising a laminated plate ( 20 ) in which an interior part being inside of an outer periphery of the laminated plate ( 20 is fastened to a side plate ( 11 ) of a bucket ( 10 ) of a construction machine, the interior part is within a region G comprising: i) a part D consisting of a center point d of a line segment BC and an area in the vicinity of the center point d, the line segment BC connecting a point B and a circular arc center C of the side plate ( 11 ) having an outer periphery including a substantially circular arc shape in at least a portion of one side, the point B being where a line segment CA intersects with the outer periphery of the laminated plate ( 20 ), the line segment CA connecting the circular arc center C of the side plate ( 11 ) and a point A where, on the outer periphery of the side plate ( 11 ), there is a transition from the substantially circular arc shape to another shape on a side of attachment of the bucket ( 10 ) to the construction machine; ii) a part F consisting of a center point f of the line segment CA and an area in the vicinity of the center point f; and iii) a region between the part D and the part F.