Bob, now I understand….it will be exciting to see your progress. Thanks for clarifying.

Bob, I'm sure that your action will be a masterpiece and you may also then know why the Hepburn/Walker Hepburns ended up the way they did instead of like the Patent;-)

As I said earlier there are only 2 known guns of this style.  First one Tom Rowe calls a Short Range Creedmoor in the Hepburn Book.  The other is a military style gun.  The one I am basing this gun on is the Military gun.  Looking at the different parts in this gun compared to the Creedmore, and the patent drawings, this gun is probably the more advanced.  The Breech Blocks and trigger frames are different designs. 

Here are a couple pictures of this guns trigger frame.  I have arrows pointing to a piece of steel dovetailed into the base frame and then pinned into place from the top.  This dovetailing is done on both side of the frame and I believe it was done to modify an existing frame in order to add the bump, and valley in front of the bump.  It appears this valley is the bearing surface for a mating radius on the breech block that captures the breech block.  The breech block rotate after lowering enough to clear the square thrust shoulders of the Breech Block and contacting this valley.  These picture help to understand this.

Because I am just getting started, this is all casual observations at this point and I will correct it later if I find out this works differently than I believe at this point.
Bob

steel-pounder, if I understand what you are asking, you are referring to the lower case “a” rail in the breech block, shown in the patent drawing.  If so, I believe what you are saying is correct.

Neither of the two actual examples have that rail.  The Short range version has a cam that appears to be activated by the lever and the cam then tips the breech block.  The military version has this valley and bump that the breech block drops into and is then tipped by the link and the finger lever is opened.  This is hard to see when the parts are installed in the frame, but am fairly certain I am correct on this.  I will understand more as I get deeper into my drawing, seeing dimensions and understand what is going on inside this action.
Bob

Ya, this could get really confusing looking at the different configurations.

On the surface, this version appears to be the most simple and robust. Being a military version, I believe, is the reason for this.  So it is what I am concentrating on, but we will see.  I just about have the first drawing done.  It’s a side view of the frame and hole locations.
Bob

Yes, bobw! Interesting machining challenge cutting that "red arrow" internal radius - on both sides of the internal receiver.

Thanks for sharing... Looking forward to seeing more  

Jeff P

Amoretti wrote yesterday at 5:23pm:


Actually 3.

steel-pounder wrote yesterday at 7:47pm:


Yes, it’s the track for the breech block.  The issue is, the barrel receiving block of the frame is in the way of any normal cutter.

The other 2 can be machined using conventional methods, there’s plenty of room.

An updated picture pointing out all 3 tracks.
Bob