This is another type of underhammer lock.
It is similar to others that have been used with some slight differences.
Springs have not been inserted.
Now installed into "The Frontier" pistol.
Lock is steel, common 1/8 inch thick plate, for testing the design. Rear two pins are 1/8 inch brass while the front pin is 0.203 inch diameter steel from my scrap pile.
The close up shows the hammer in full cock position with the sear being held by the trigger. No springs are shown yet. Pushing up on the hammer holds the lock tightly together. While pulling the trigger it is noted that there is very little force applied to the trigger by the sear. I note that the sear+trigger connection is visible outside of the lock, remember this is just a prototype. Normally the trigger and sear pins would be higher up hiding both.
This picture shows the hammer down, sear released, trigger pulled. The sear does not need to move more that pictured to release the hammer. Yes, the trigger shape is ugly and it will most likely be shortened.
The close up of the hammer down, etc. Red marker pen on the hammer shows the hammer and sear are not touching.
Lock serial number can be: P11132013.
Here are three more pictures, with springs.
Action at full cock, hammer spring under full tension. Trigger pull is nice and smooth.
Hammer spring is cut from an old rusty hand saw blade, tempered first.
Main spring block; 8-32 tap, soft soldered to back frame, it will be riveted later.
The brass washers are temporary, used to space the parts up away from the frame and to have the hammer spring centered.
Trigger was reshaped.
Trigger spring is shaped like an "L". Sear spring is shaped like a "V".
As the trigger is pulled the rear of the sear moves down just a tiny amount. This should keep it locked if it gets dropped ;-)
There is some temporary brass tubing over the trigger and sear posts to hold the 2 springs in position.
IdeZilla
Comments Appreciated.
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