Slip joint balisong knives? (Cold Steel Paradox and similar)

[The_Iron_Joe]

I have been carrying either my CS Paradox or an older knife called "Jeans Knife" (which appears to predate the Paradox by some time, but utilizes the same concept in construction), off and on for the last week or two. It got me thinking, are there any other examples of this type of slipjoint knife, modern or otherwise?

For those unfamiliar, the overall construction is about the same as a typical balisong / butterfly knife, except that each handle has its own spring, meaning the knife is meant to be opened with two hands, very much a slipjoint with two handles. I've been casually looking for info of other examples of this type of knife online, but have come up short in finding any other variations, custom or production. I am aware of pantographic knives, but that's not really what I'm looking for.

I tried looking into the history of butterfly knives to try to track down these kinds of variation, but they may have been modern and short lived, with little information available online.

Does anyone here have any ideas or info?

 

[tltt]

The Jeans knife (1980's), the Paradox, and the Cold Steel Black Rock are the only models I can remember using that system I can remember. I've never seen a knife older than the Jeans using it. The Jeans came about when the restrictions on Butterflies started happening.

 

[The_Iron_Joe]

Really surprised that neither of us has been able to dig up more info than this. I guess it must be a fairly niche design... I'll probably continue to look for more instances of this kind of knife, but it's starting to look like there just aren't many examples out there.