Abstract: A toggle clamp locking mechanism for selectively coupling a work piece. The mechanism includes a base structure; a primary locking system movement between a retaining position and a release position, the primary locking system having a handle member pivotally coupled to the base structure, an action for engaging the workpiece in the retaining position and releasing the workpiece in the release position, and a linkage system mechanically interconnecting the handle member with the action. A second locking system having an engagement member is provided having a cam follower cammingly engaging a first detent when the primary locking system is in the retaining position preventing the primary locking system from moving from the retaining position. The second locking system is actuatable to disengage the cam follower from the first detent to enable movement of the primary locking system to move from the retaining position.