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Forgive me for being bolt action trash but what is a "screw grip" and what advantage does it offer over any other style of double?

Here's a good explanation from another forum-

#149429 - May, 28 2009 04:47 PM Re: Screw-grip [Re: HomelessjOe]
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Registered: November, 29 2004
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Originally Posted By: HomelessjOe
The Webley "screw grip action" has nothing to do with an underlever..."screw grips" were mostly used on box locks


You're confusing several different kinds of screw grips. There was no "Webley screw grip action". Webley didn't invent the screw grip, and the visible threads on the spindles of some Webley models have nothing to do with the term.

The screw grip was first patented in Britain by Henry Jones in 1859 - an "underlever screw grip for breech loading actions" - typically referred to in the trade as "Jones underlever" or "lever over guard" as Lagopus correctly stated. The Jones is a screw grip action. It's primary (and only) locking system is a screw grip.

The same rotary locking method was then patented by Wilkinson Sword Co. (James Wilkinson) for fastening fore-ends in drop-down barrel action guns. The 1866 screw grip fore-end fastener patent (the familiar side-swinging fore-end lever) was by a Wilkinson workman, which made it Wilkinson's property. Wilkinson Sword Co apparently sold the patent to Rigby before it expired.

After both of the previous patents had expired, Thomas W. Webley and Thomas Brain designed a rotary locking THIRD FASTENER for drop-down barrel action guns that was a direct crib on the previous screw grip patents. In the 1882 Webley & Brain screw grip top-fastener patent, primary lockup is accomplished by conventional (Purdey) sliding double underbolts that engage corresponding lugs milled into the barrel lumps, with a rotary locking third fastener that engages a rib extension. The Webley is a conventional sliding double underbolt action with a rotary (screw grip) top fastener. It isn't a screw grip action, while the Jones underlever is. Webley made a great many sidelocks with their screw grip top fastener (their W & R model was made for dozens of other gunmakers) in addition to several models of their famous boxlocks.


_________________________
"Serious rifles have two barrels, everything else just burns gunpowder."

quote:

Originally posted by Fjold:
Forgive me for being bolt action trash but what is a "screw grip" and what advantage does it offer over any other style of double?

See how the dolls head actually engages the lever? The lever has a cam (screw) on it that locks the doll head to keep it all tight.

Butch isn't afraid to recreate some of the classic actions.... and he does it with aplomb!

That said, I'm not sure, at least in a modern double, what is better looking, more accurate, reliable and just plain practical than my Searcy Classic in .500 N.E. Can't wait until my next elephant hunt!

I could get excited about that. Mainly because that is what he's building for me in a .470 NE!

quote:

Originally posted by McKay:

quote:

Originally posted by Fjold:
Forgive me for being bolt action trash but what is a "screw grip" and what advantage does it offer over any other style of double?

See how the dolls head actually engages the lever? The lever has a cam (screw) on it that locks the doll head to keep it all tight.

Thanks, I can see that. The next time I'm up at Butch's place I'll ask to see it.

It would be nice to know what is the purpose of this feature and if it is just for the 600NE?

quote:

Originally posted by shootaway:
It would be nice to know what is the purpose of this feature and if it is just for the 600NE?

Read my post. No, not just for a 600. Just another way of locking up a double. Has been around for a century or more.

I had a 600 on order so it presented me with a good reason to make a screw Grip. I get bored and go off on tangents to keep me interested.
Basically I'll make a screw grip or rising bite or what ever if a customer wants it.

I currently have a 470 sidelock, a 470 boxlock with sideplates, and a 375 boxlock on order now. All Screw Grip actions

1902 Webley long bar "screw grip".

quote:

Originally posted by Frostbit:
1902 Webley long bar "screw grip".

Now that is impressive. I don't get to see them often. Thanks for the picture.

Picture is now posted