I've been toying around with building a derringer pistol for some time. I sat down today and started putting everything on paper. Well, rather in CAD. I have the basis for what I think is the start of a decent design. But I wanted to get some input from others who may have tacked this topic in the past. Specifically I am currently interest in comments on my trigger/hammer design.
The three pictures below show the action in it's three states, uncocked, half cocked, and full cocked. This is intended to be in the half cocked position when loading and carrying - ie, my intent is to have the trigger non-functional when half-cocked. To achieve this I have designed the notch with somewhat of a hook that should capture the sear of the trigger. Hopefully preventing the trigger's ability to release the hammer. In the full-cocked position, it should hopefully allow the release with a slight additional amount of spring pressure from the mainspring, since the angel is about 80 degrees.
The mainspring provides pressure to the hammer by means of a cam locked strut with a coil over spring resting in the grip spacer. The trigger will have a return spring to press the sear surface against the hammer surface.
Feel free to critique it. This is just the initial phase of design here....