Coupler with secondary lock on front hook

Abstract

A coupler includes a frame with a front hook and a rear hook. A rear hook lock moves between an unlocked position and a locked position, wherein the rear hook lock obstructs an open mouth of the rear hook when the rear hook lock is in its locked position. An actuator is connected to the frame and is operatively connected to the rear hook lock. The actuator is adapted to move the rear hook lock between its unlocked and locked positions. A secondary lock includes a latch that moves between extended and retracted positions, wherein the latch obstructs an open mouth of the front hook when the latch is in its extended position. A first lock bar is connected to the frame and is movable between: (i) a disengaged position in which the first lock bar allows movement of the rear hook lock to its unlocked position and allows movement of said latch to its retracted position; and, (ii) an engaged position where the first lock bar blocks movement of the rear hook lock to its unlocked position and blocks movement of the latch to its retracted position. The first lock bar is biased toward its engaged position and is adapted to be moved to its disengaged position by contact with an associated excavator arm.