I suppose it's about time I finally got around to talking compression lock flippers like I mentioned early in the thread, and you all have my sincerest apologies for making you wait so long with what I'm sure was bated breath... plus this could use a bump.
So, the compression lock is by far my favorite locking mechanism, and once I felt I had a good handle on how to implement the lock in a sound manner, I pretty quickly started to consider incorporating a flipper mechanism. As an aside, I have a bit of a love/hate relationship with flippers. On the love side, I do really enjoy the almost instantaneous deployment you get with a good flipping mechanism; and somehow, incessant flipping never gets old... at least not for me, the wife and kids get understandably annoyed after a while. On the hate side, I'm not a fan of the protrusion flipper tabs usually entail. They can be cumbersome in pocket (I really do spend a lot of time considering the closed form of my designs, and while actual use is paramount, my personal knives probably spend a fair bit more time in my pocket than in my hand... sigh, office life). Plus, the tab can almost ruin the knife aesthetic if you're going for really clean, svelte lines for a particular design.
The Sliverax mechanism was the first workable version of a compression lock flipper I came up with, and it's pretty straight forward. The flipper tab is just an extension on the tang, wrapping around the stop pin to get the tab into a location that gives it the right amount of leverage and generates a big enough moment to open reliably. This ends up creating a detail that looks a lot like a portion of an internal stop pin track just inboard of the flipper tab, but the cut out is further away from the pivot than a full internal stop configuration, to keep the blade as robust as possible. And that's about it. I've got 2 or 3 other flipper incarnations I'm trying to work into newer designs, but really at their heart they are all fairly similar, you have to have certain features and components to make it functional, and then you come up with design inversions that better integrate into your target package.
I also believe in simplicity and elegance in a design whenever possible, so I try and not get overly intricate or complex, and start forcing extra elements or components into a knife. We're already putting bearings in these things, and that's probably on the upper end of what I consider reasonable for what is supposed to be a 'basic' hand tool. In the end, bearings are still a far sight better than most opening assist mechanisms out there, and they do
provide consistent, smooth flipping action in a pretty cost efficient manner.
And I guess that's my flipper/bearing manifesto, hope you found it at least interesting if not educational,