A safety mechanism for a coupler for coupling an accessory to a dipper arm.

摘要

A coupler for an excavator is provided comprising a body member, a fixed engagement and a moveable engaging means mounted on the body member for engaging a first and second pair of coupling pins of an accessory, a drive means acting between the moveablc engagement means and a latch for urging the moveahle engagement means between an engaged state and a disengaged state and for urging the latch from the latched state to the unlatched state against the biasing action of a biasing means when the moveable engagement means is in the disengaged state; and a safety means comprising at least one second biasing means coupled to the moveable engagement means, the second biasing means urging the moveable engagement means into the engaged state.