Patent ID: 7096610

Claim:
A dipper assembly comprising: a dipper having an open bottom; a door pivotally linked relative to said dipper, said door having a closed position in which said door closes said open bottom; and a closure mechanism movable between a lock position and an unlock position, said closure mechanism including at least one link pivotally connected relative to said door, a crank body rotatable about an axis of rotation, and a crank pin extending from said crank body and pivotally connected to said link, said crank pin having a longitudinal axis offset from said axis of rotation of said crank body, wherein rotation of said crank body about said axis of rotation in one direction moves said crank pin an arc distance which urges said link toward said lock position to hold said door in said closed position, and rotation of said crank body about said axis of rotation in an opposing direction moves said crank pin an arc distance which urges said link toward said unlock position to allow said door to swing away from said closed position, wherein said crank body is rotatably fixed to a shaft, and rotation of said shaft about said axis of rotation causes said link to move between said lock position and said unlock position.