Patent Breech

[Kaw Trooper]

Would some one please leave me a diagram or drawing of the inside of a patent breech? I want to understand what I'm trying to clean out after shooting.

Thank you for the help.

 

[Donny]

I have ground a flat bottom breech plug scraper to fit a pat. breech. Just stick it in, twist it, pull it out, grind or file the black area, that will show you where. (contact mark). Repeat until the scraper comes out black all around.
Custom made. You do not really need to clean the pat. breech, I had several guns that I never cleaned the breech. I was using too sloppy of a cleaning mix while shooting, fouling the breech. I quit using such wet patches, etc. while shooting. ::

 

Here is the original Nock's Patent Breech for Flintlocks....

Modern patent breeches are a variation on this theme..........

 

[robinghewitt]

This was drawn by someone who doesn't understand screw threads or touch holes or Nock's breech :shake:

Nock's breech was elegant, it supported the threads at the back then tapered gracefully outwards and blended smoothly into the bore.

Engineers will understand, nobody else will care :crackup:

 

[Kaw Trooper]

Thanks everyone, I now have a very good understanding what is there.

Yes, I'm sure that is an amateur drawing, as the threads do not match and are of a too sharp of an angle. :thanks:

 

[musketman]

Thanks everyone, I now have a very good understanding what is there.

Yes, I'm sure that is an amateur drawing, as the threads do not match and are of a too sharp of an angle. :thanks:

Here is the outside of a Patton Breech... :haha:

Oh, you said Patent Breech, my mistake... :crackup:

 

[roundball]

Just as a matter of info, the vertical center drilled out section of TC's patent breeches is a step down design.

The larger diameter section at the top of the breechplug is smaller than bore size so that a caliber size ball won't fit down into it;

Then after about 1/3-1/2" down, it steps down again to a smaller diameter no much larger than a pipe cleaner;

Then the channel to the vent is like the left had sketch about...a channel to the vent without any sort of powder resevoir horizontally under those vertical sections.

Using a spare TC patent breech I have, I've measured and learned that TC's hold about 16-18grns of 3F to come flush with the top of the beveled cone at the top of the breech.

My impression of Patent Breeches is very positive...no fouling or anything gets down into the breech, never use a vent pick...(haven't taken it out of the range box since I bought it a few years ago)...ignition seems instantaneous, etc.

 

My impression of Patent Breeches is very positive...no fouling or anything gets down into the breech, never use a vent pick...(haven't taken it out of the range box since I bought it a few years ago)...ignition seems instantaneous, etc.

You live a truly charmed life Roundball!
:imo:

 

[robinghewitt]

Here's my preferred picture :thumbsup:

("anti-chamber" sounds a bit Star Trek, think he meant antechamber)

 

[roundball]

My impression of Patent Breeches is very positive...no fouling or anything gets down into the breech, never use a vent pick...(haven't taken it out of the range box since I bought it a few years ago)...ignition seems instantaneous, etc.

You live a truly charmed life Roundball!
:imo:

Well, with rare exception, I'm in my 4th year of taking a flintlock to the range every Saturday morning, shoot 40-50 shots of Goex 3F & PRB, don't wipe beteween shots, and never have to pay attention to anything down in the patent breech or vent area.

I keep rifles showroom clean after every shoot, my lube is bore butter, the Hornady balls are pure lead, the pillow ticking is cotton, etc, etc...what else is there if not the design of the patent breech?

 

Rockin' Robin, i've never seen that diagram before. Very interesting. The breech plug looks just like the cross section of a chambers white lightning liner. I guess Jim should have called it the " Chambers patent liner" ::. Perhaps this picture was the inspiration for the whitelightning :hmm: Thank you VERY much for shareing.

Cody

 

[Runner]

You need enough powder to fill the cavity, but you also need enough to fill up around the outside curve of the ball. The listed minimum on my 36 is 30 grains, but 25 will fill the void. There is a reason for listed minimum loads! Some breeches are so wide that this is not a problem, but others are much smaller than bore and need that filler powder above the chamber to prevent airspace behind a ball.

 

I guess Jim should have called it the " Chambers patent liner" ::.

On second thought, it sounds too much like "panty liner". You can just hear the silence on the other end of the phone if someone was to call Chambers Flinlocks and order "a few panty liners" :crackup:.

Cody

 

[TANSTAAFL]

One will note the thin threaded walls of the breech plug would in fact be sealed even tighter by the internal pressures bearing onto the concave surface area. I doubt if this was accidental, Nock knew what he was about from the get go.

 

[robinghewitt]

I doubt if this was accidental, Nock knew what he was about from the get go.

How true, the patent was all concerned with the shape of the cavity and the fact that it lit the charge in the middle.

Personally I think it's more to do with the uncompressed powder in the antechamber acting as a detonator for the main charge.

 

This was drawn by someone who doesn't understand screw threads or touch holes or Nock's breech

hmmmm......well here is a reprint of Nock's original spec drawings for the British patent office....

the first drawing offered is from "English Guns & Rifles" by George - other than some minor differences it looks pretty much the same to my tired ole eyes...........

 

[robinghewitt]

 

[Donny]

this was metal of 200 yrs ago, drilled like Swiss cheese, and it held up. And some folks today worry about shaving any metal in and around the breech area. ::

 

[WRussell]

Robin -

Methinks your preferred picture, not to knock it, is not Nock (is that a not Nock not Nock joke?)

At least, with the touch hole liner it shows, there is no need for the plugged hole on the opposite side.

 

[TANSTAAFL]

I doubt if this was accidental, Nock knew what he was about from the get go.

How true, the patent was all concerned with the shape of the cavity and the fact that it lit the charge in the middle.

Personally I think it's more to do with the uncompressed powder in the antechamber acting as a detonator for the main charge.

Christian Sharps floating gas seal for his paper cartridge rifle worked on the principle of a tapered internal cone. It utilized gas pressure for diametrically sealing the thin portion of cone in the breech block, while it also drove the seal forward tightly against the machined end of the barrel, achieving a somewhat effective seal.