Bucket device for rocker shovel

Claim 1

A bucket device for a rocker shovel comprising a body frame, a link member pivotally connected at one end thereof to said body frame for rotation about a horizontal axis, a bucket pivotally supportEd at the back bottom portion thereof by the other end of said link member, a first stopper on said link member for restricting the backward pivotal dumping movement of said bucket with respect to said link member, a hydraulic cylinder pivotally attached to said body frame and said link member for selectively rotating said link member, a first link pivotally connected at one end thereof to said bucket at a point above the connection of said bucket to said link member, a second link pivotally connected at one end thereof to the free end of said first link and at the other end thereof to said body frame at a point spaced above the point of connection of said link member to said body frame, and a second stopper on said body frame for limiting the rotation of said second link, whereby the upward rotation of said link member by said hydraulic cylinder produces a rotation of said bucket with respect to said link member away from said frist stopper, the engagement of said second link with said second stopper causing said first and second links to rotate in opposite directions thereby initiating a dumping movement of said bucket which is continued by the weight of the bucket and contents when the center of gravity thereof crosses the vertical plane containing the bucket pivot connection with said link member.