Dipper door latch with locking mechanism

A latch mechanism for a dipper, the dipper including a body defining an opening and a door pivotably coupled to the body to selectively close the opening, the latch mechanism comprising:

• a bar;
• a first member having a recess for receiving the bar and being pivotable between a locked position, in which the first member releasably secures the door relative to the body, and an unlocked position;
• a second member including a first end coupled to the first member and a second end and being pivotable between a locked position and an unlocked position, the second member, pivoting movement of the second member from the locked position toward the unlocked position causing the first member to pivot from the locked position toward the unlocked position;
• and
• a holder releasably retaining the second member in the locked position when the first member is in the locked position.

A shovel comprising:

• a boom;
• an elongated member movably coupled to the boom, the elongated member including a first end and a second end;
• an attachment coupled to an end of the elongated member, the attachment including a body defining an opening and a door mounted on the body adjacent the opening, the door being pivotable relative to the body between a closed position and an opened position;
• and
• a latch mechanism for releasably securing the door to the body to close the opening, the latch mechanism including
• a bar,
• a first member having a recess for receiving the bar and being pivotable between a locked position, in which the bar is positioned in the recess and the first member releasably secures the door relative to the body, and an unlocked position,
• a connecting link including a first end pivotably coupled to the first member and a second end,
• a second member including a first end pivotably coupled to the second end of the connecting link and a second end, the second member being pivotable between a locked position and an unlocked position, pivoting movement of the second member from the locked position toward the unlocked position causing the first member to pivot from the locked position toward the unlocked position,
• a biasing member coupled between the connecting link and the second member, the biasing member exerting a force to pivot the connecting link and the second member relative to one another, and
• a holder releasably retaining the second member in the locked position when the first member is in the locked position.