SIGforum
A mechanical engineering question re the Glock-like trigger “safety” tab or inertia block.*

This topic can be found at:
https://sigforum.com/eve/forums/a/tpc/f/430601935/m/7680089774

December 28, 2020, 07:29 AM
sigfreund
A mechanical engineering question re the Glock-like trigger “safety” tab or inertia block.*
Thanks for the additional comments and video link. Despite having attended two P320 armorer courses, some of how the trigger mechanism works was/is a little vague to me.
December 31, 2020, 02:35 PM
Grayguns
[QUOTE]Originally posted by BBMW:
"As another question for the engineers, how far would the pistol have to be dropped to accelerate 7 grams of trigger weight to overcome the resistance of a 2800+ grams trigger pull weight, even without the counteracting inertia of the upper part of the trigger and the trigger bar?"

Who says the inertia of the trigger bar and upper half of the trigger necessarily counteracts the mass of the finger piece?

Mass balance is the key. Getting the trigger CG in the optimal location matters. Just making the trigger lighter isn't the main point here. And those values all change as trigger leverage is increased.

To answer Sigfreund's excellent question: The Glock tab safety is absolutely necessary for drop safety integrity in those pistols. This is because, unlike in some other striker-gun designs, the trigger acts upon the entire fire control train from below it's pivot axis. A good friend and firearms engineer likens the effect to having both kids on one end of the teeter-totter. Having one kid on each end is more balanced, even if one of 'em is a bit bigger. From there, we can scoot the big kid up or lengthen the skinny kid's side...you get the basic idea.

The P320 hasn't needed such a trigger tab safety to meet its design criteria, whether before the voluntary upgrade, or now. There is a potential role for such devices in this platform, but that is to achieve some pull characteristics well beyond what anybody should wish in a service pistol.

-Bruce




Designer and custom pistolsmith at Grayguns Inc. Privileged to be R&D consultant to the world's greatest maker of fine firearms: SIG SAUER

Visit us at http://opspectraining.com/product-cat/videos/ to order yours, and Thank You for making GGI the leader in custom SIG and HK pistolsmithing and high-grade components.

Bruce Gray, President
Grayguns Inc.
Grayguns.com / 888.585.4729
December 31, 2020, 02:44 PM
stoic-one
Long time no see, Bruce.

Hope your holidays are going well.


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December 31, 2020, 04:42 PM
sigfreund
Thank you, Bruce!
And best wishes to you (and everyone else) for a Happy New Year.