Check this out - it looks like some boys from down under are the real "inventors" of the ABP/ Split Pivot design:
"If the seatstay link was concentric to the axle (ie the pivot was at the axle) then you could run the brake caliper on that and it'd be like one big floating brake... not particularly likely to have "optimal" braking characteristics but it'd be pretty close to a lot of FSR bikes really."
..."Then more recently, I've also been wondering if it was possible to design a rear chainstay/seatstay pivot that centred around the axle.
Now that you've explained that it would effectively be a floating brake, I'm interested to try it (not that I have the engineering talents or resources)... However, why did you say that the braking characteristics wouldn't be optimal?
I'm only wondering because I'm suggesting that the mount is on the seat stay and therefore technically identical to an FSR, but without the Horst Link..."
"For all intents and purposes, they would be nearly identical to an FSR bike. That's not optimal, in my eyes
Basically if you did that, it would be like using a singlepivot + floating brake (since one of their pivots is always axle-centric too), with the floating brake also used to drive the shock in some way. Draw from that what you will."
The whole conversation can be found at http://www.rotorburn.com/forums/showthread.php?35572-quot-Brake-jack-quot-an-explanation.
The thread was from way back and likely pre-dates Trek & Weagle. I'm no patent attorney, but this looks like prior art to me...
BTW, how can both patents co-exist?? They each seem to violate the others first claim. Anyone know???
If the USPTO were to determine that the above is prior art, then it sucks to be either Trek or Weagle. Good for everyone else, though, since any builder could use the concentric pivot (as has been the case for decades up until these two bogus patents)
"If the seatstay link was concentric to the axle (ie the pivot was at the axle) then you could run the brake caliper on that and it'd be like one big floating brake... not particularly likely to have "optimal" braking characteristics but it'd be pretty close to a lot of FSR bikes really."
..."Then more recently, I've also been wondering if it was possible to design a rear chainstay/seatstay pivot that centred around the axle.
Now that you've explained that it would effectively be a floating brake, I'm interested to try it (not that I have the engineering talents or resources)... However, why did you say that the braking characteristics wouldn't be optimal?
I'm only wondering because I'm suggesting that the mount is on the seat stay and therefore technically identical to an FSR, but without the Horst Link..."
"For all intents and purposes, they would be nearly identical to an FSR bike. That's not optimal, in my eyes
Basically if you did that, it would be like using a singlepivot + floating brake (since one of their pivots is always axle-centric too), with the floating brake also used to drive the shock in some way. Draw from that what you will."
The whole conversation can be found at http://www.rotorburn.com/forums/showthread.php?35572-quot-Brake-jack-quot-an-explanation.
The thread was from way back and likely pre-dates Trek & Weagle. I'm no patent attorney, but this looks like prior art to me...
BTW, how can both patents co-exist?? They each seem to violate the others first claim. Anyone know???
If the USPTO were to determine that the above is prior art, then it sucks to be either Trek or Weagle. Good for everyone else, though, since any builder could use the concentric pivot (as has been the case for decades up until these two bogus patents)