Assembly Extracting Mechanism (S&W No 3 Rus)

There is S&W No. 3 Russian Issue 3, 1880 under consideration.

It is the purpose of this post to show all details of Extracting Mechanism in order (how I understood) theirs assembly.

Let's take the Barrel. It is mono detail, one piece of metal with complicated and precise machining. There are three place on Barrel which take a hand in extracting: (1) on the top right-hand, (2) on the bottom and (3) the Pivot(?). See more dark color places.

There is female thread (S1) on the right of bottom part.



Let's take the Base Pin. It is mono (simple) detail, the tube with male thread (S1) on the left. The male thread is the same as the female one of Barrel. Also there is the one quarter Cut on the left of Base Pin. The internal diameter of Base Pin (D2) is the same as the internal diameter on bottom of Barrel.



Let's screw in the Base Pin into the Barrel.

Note. The one quarter Cut must be precise on bottom.

Let's take the Gas Ring. It is mono (simplest) detail, the tube (the ring) with groove. The external diameter of it (D3) is the same as the male thread (S1) of Base Pin. The internal diameter of it (D4) is the same as the external diameter of the Base Pin. In other words the thickness of tube is equal to height of the thread.



Let's get the Gas Ring on the Base Pin.

Let's take the Pawl. It is the assembly which includes: (1) Pawl itself, (2) Spring and (3) Pin (Rivet).

Let's put the Pawl in its right place.

Let's take the Cylinder Catch. It is the assembly which includes: (1) Cylinder Catch itself and (2) Screw.



Let's put the Cylinder Catch in its right place.

Note. The right hand of Cylinder Catch is up.

The initial assembly of Barrel is completed.



Let's take the Cylinder. It is mono detail, one piece of metal with complicated and precise machining. The feature is the square aperture (Q1) into bore.
The internal diameter of bore (D4) is equal to the external diameter of Base Pin. The left-hand internal diameter (D3) is equal to external one of the Gas Ring.

Note. One (two opposite) side of square is into alignment with one of Cartridge Camber.



Let's take the Extractor. It is the assembly which includes: (1) Extractor itself and (2) Extractor Stud. The Extractor is made with complicated and precise machining. The Extractor Rod is square in section. The external square (Q1) is same as the square aperture into bore of Cylinder. There is the female thread (S2) on the right-hand the same as male one of Extractor Stud. And there is the male thread (S3) on the left-hand.



Let's put the (square) Extractor Rod into square aperture (Q1) of Cylinder.



The Extractor is put into Cylinder.

Note. There is the clearance between external (square) diameter of Extractor Rod and internal diameter of Cylinder bore.



Let's screw in the Extractor Stud into Extractor.



The Extractor Stud is completed. The assembly of Cylinder is completed too.



Let's take four details: (1) the Rack, (2) the Spring, (3) the Bolt(?) and (4) their Nut. The Rack has eight cogs (plus one aside). The external diameter of cogs (D2) is same as internal one of Base Pin. The female thread on the right (S3) is equal to male one of Extractor Rod. The internal diameter of Rack (D6) is same as external diameter of Spring and same as one of Bolt's head. There is an aperture on the left hand (side) of Rack. It is equal to diameter of Bolt (D9). The thread of Bolt (S4) equals, of course, to one of Nut.



Let's put the Bolt into Spring (or put the Spring on Bolt).



The assembly Bolt and Spring is completed.



Let's put the Bolt (with Spring) into Rack.



The Bolt is completed. The thread of Bolt (S4) stick out on the left-hand (side) of Rack. The Spring is not tensed.



Let's screw in the Nut. The Rack assembly is completed.



Let's join Cylinder and Rack assemblies. The female thread of Rack (S3) is equal to the male one of Extractor Rod. The external diameter of Bolt's head (and of Spring) (D6) is same as internal one of the Extractor Rod.



Let's screw in the Rack on Extractor Rod.



The Rack is screwed on Extractor Rod.

Note 1. The head of Bolt is into Extractor Rod.

Note 2. There is the clearance between external diameter of Rack (which is equal, I thing, to external square diameter of Extractor Rod) and internal diameter of Cylinder bore. This clearance is equal to tube thickness of Base Pin.

The Rack and Cylinder assembly is completed.



Let's join Cylinder and Barrel assemblies.

The external diameter of Gas Ring (D3) is equal to the left-hand internal diameter of Cylinder. The external diameter of Base Pin (D4) is equal to the internal one of Bore. The external diameter of cogs (D2) is equal to internal one of Base Pin and Barrel.



The cogs of Rack are put into Base Pin. The Base Pin itself is put on right-hand diameter of Rack.



The tube of Base Pin is put into clearance between external diameter of Rack and internal one of Cylinder Bore. The cogs of Rack (D2) are put into Base Pin and (further into) Barrel.

Note. The Nut's head of the Bolt push the bit of Pawl. The Pawl is turned clockwise. The Spring of Pawl is tensed.



The Cylinder and Barrel assembly is completed.

Note 1. The bit of Pawl is put in groove of Nut. The Pawl is return in its right place.

Note 2. The right hand of Cylinder Catch is down. The Cylinder Catch holds the Cylinder. (The right hand of Cylinder Catch is down under effect of Barrel Catch, which I don't examine there.)



Let's see how work the Extractor.

Let's put the fired round into Cartridge Chamber.



Let's push the Rack to the right.

There are unmoving parts. They are: Barrel, Pawl, Cylinder Catch, Cylinder, Base Pin, Bolt and Gas Ring.

There are moving parts. They are: Rack, Extractor, Spring and Round.



Let's push the Rack to the right more.

The Spring is tensed. The Rack and the Extractor are in maximum right position. The Extractor extract the Round out Cartridge Camber.



The Round is falling down.



Let's assemble Pivot.

It needs four details some more: (1) Frame, (2) Gear, (3) Joint Pivot and (4) Screw.



Let's put these four details in its right place.

Note. The right hand of Cylinder Catch is up. The Cylinder is hold now (in this position) with Frame.

Let's take the Pawl-2. It is the assembly, which includes: (1) Pawl itself, (2) Spring and (3) Pin (Rivet).



Let's put the Pawl-2 in its right place.

The assembly of Extracting Mechanism is completed.



Thank you for attention.

Author = sasha1648.

P.S. And finish drawing.

Not being familiar with a #3 I can't comment on the correctness of the information, but this is the most detailed and informative essay I have ever seen on this type of subject. So, if one of you "experts" agree, this should be listed with "Expert Commentary" for future reference.

sasha1648 has hit a home run with this post! His explanation, except for minor differences and in theory, can be applied to most of the large frame S&W top breaks and the Tula and Ludwig Leowe copies. Ed.

(Lee. As H.Richard suggested , and I second the motion, put this in "Expert Commentary" ASAP!)

I have to agree with H. Richards post 100% and as opecfc stated, this would be helpful for any #3 owner. This required a very time consuming task.
baldeagle8888

Excellent !