Linkage assembly for construction machine

A construction machine, comprising:

• a machine frame;
• a plurality of ground engaging units for supporting the machine frame from a ground surface;
• a work tool coupling;
• left and right boom arms pivotally supported directly or indirectly from the machine frame and pivotally connected to the work tool coupling;
• left and right work tool actuators mounted on the left and right boom arms, respectively;
• and
• left and right actuator linkages connecting the left and right work tool actuators, respectively, with the work tool coupling, wherein the left and right actuator linkages each comprise:
• a bell crank pivotally mounted on the respective boom arm, the bell crank including a crank shaft pivotally mounted in a fixed position on the respective boom arm and first and second crank arms extending from the crank shaft at a fixed angle relative to each other, the first crank arm being pivotally connected to a respective one of the work tool actuators;
• and
• a rigid actuator link pivotally connected at one end to the second crank arm and pivotally connected at another end to the work tool coupling.