How does the extractor function?

664 Views 8 Replies 6 Participants Last post by Forge, Jul 16, 2008

Second_Life

Discussion Starter · Jul 16, 2008

I'm trying to understand how the extractor (181) functions and what it performs. Can anyone give a clear and simple explanation? (Yes, I also started a new seperate thread for the function of the ejector).

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JFB

· #2 · Jul 16, 2008

Since the design of KT is a ~~delayed blowback~~locked breach, there is no gas pressure in the barrel to blow the spent round out. do to inertai, the impulse force applied to the slide from a fired round will cause the slide to travel rearward. when in battery, the hook of the extractor was in the case rim groove. as the slide travel rearward the engagement of the extractor will pull the spent round from the chamber.

as the spent round is being pulled back, near the end of slide travel, the side of the rim opposite the extractor will impact the ejector, this puts a twisting motion on the case and prys the rim form the extractor's engagement. the extractor hook is held in by position by a leaf spring that allows the ejector to flex as the rim is pried away from the traveling slide's breach.

when the slide travels over the next round in the magazine, the rounds will rise. the small inside curvature of the ejector will cause the top round to begin to travel foward towards the chamber

when the breach of the slide goes back past the ejecter lip, the rim of next round will slide up on the breach face and the rim will slide under the hook on the extractor.

the recoil spring returns the slide to battery and chambers the fresh round

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alamo

· #3 · Jul 16, 2008

JFB said:
Since the design of KT is a delayed blowback,

I think you meant to say locked breech. You're thinking of the Seecamp.

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JFB

· #4 · Jul 16, 2008

Thanks, As I rushed that blurb out...I though, that delayed blowback sounds wrong, but lock breach didn't come to me....I guess I should read the header for the section :-[

Also, after weeks of trying to make sense out of the terms and condition related to commercial/professional liablity insurance, you would think I would be more careful with my words

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boatnsc

· #5 · Jul 16, 2008

Great explanation of how the extractor worked , an addition to my limited firearm operation of the Kel Tec design,,l for one really appreciate this tidbit of info , and illustrates the willingness of the knowledgeable ones to help others , Thanks

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pedro

· #6 · Jul 16, 2008

Very nice explanation of semi automatic pistol functions. I really enjoy reading about these little guns.

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Second_Life

Discussion Starter · #7 · Jul 16, 2008

Now that makes sense as to why the ejector is a small slip in piece, a replaceable wear-out part from the casing throw.
Thanks,
JFB

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JFB

· #8 · Jul 16, 2008

Second_Life said:
Now that makes sense as to why the ejector is a small slip in piece, a replaceable wear-out part from the casing throw.
Thanks,
JFB

Actually the ejector is made out of a harder metal than the frame so it will not wear. if the ejector was made as a part of the aluminum frame, it would not last long. for example, notice the frame ding opposite the ejector. also the precision required to machine that curvature in the frame would be more than the machining of the slot in the frame which it fits

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Forge

· #9 · Jul 16, 2008

JFB said:
Since the design of KT is a ~~delayed blowback~~locked breach, there is no gas pressure in the barrel to blow the spent round out. do to inertai, the impulse force applied to the slide from a fired round will cause the slide to travel rearward. when in battery, the hook of the extractor was in the case rim groove. as the slide travel rearward the engagement of the extractor will pull the spent round from the chamber.

as the spent round is being pulled back, near the end of slide travel, the side of the rim opposite the extractor will impact the ejector, this puts a twisting motion on the case and prys the rim form the extractor's engagement. the extractor hook is held in by position by a leaf spring that allows the ejector to flex as the rim is pried away from the traveling slide's breach.

when the slide travels over the next round in the magazine, the rounds will rise. the small inside curvature of the ejector will cause the top round to begin to travel foward towards the chamber

when the breach of the slide goes back past the ejecter lip, the rim of next round will slide up on the breach face and the rim will slide under the hook on the extractor.

the recoil spring returns the slide to battery and chambers the fresh round

+1 for an excellent description!

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