US Patent 10006734 Trigger assembly with trigger block

A trigger mechanism has a trigger block pivotably mounted on a trigger. The trigger block has a face surface that engages an actuation surface on a plunger which is movable along a line of action. The plunger has a stop surface engageable with a contact surface on the trigger. Pivoting of the trigger is prevented when the stop and contact surfaces are engaged. The plunger is spring biased to maintain the stop surface engaged with the contact surface. Pivoting of the trigger block moves the face surface against the actuation surface, which moves the plunger along its line of action. Motion of the plunger disengages the stop surface from the contact surface allowing the trigger to pivot and discharge the firearm.