Thank you TommyG and diehardbassfishing.
I'll do my best to explain the technology without leaving too much details as its still under development. Even though the contruction is very simple the mechancs behind it is very complex. We've showed this to physics professors who scratched their heads and didn't really grasped how it worked
The brake is fully mechanical and in its simplest form consists of only one moving part (as our current prototype). It uses friction to brake the spool and is activated by deceleration and the brake force is controlled by the rate of change in deceleration. We also had to explain this to the patent attorneys at Swedish Patent Office and EPO in order to get our applications through.
Here's an excerpt from our communication with them:
"Before going into detail on an analysis of novelty and inventive step in view of the cited art, the rotational friction brake of the invention will be discussed more generally, and freely, with the aim to increase the basic understanding of the invention and how it differs from rotational friction brakes of the art. In fact, the rotational friction brake of the present invention operates, especially with regards to its actuation, in a completely different way than the rotational friction brakes of the prior art, as defined in the cited documents, and is therefore also a completely different kind of brake. The rotational friction brakes of the prior art cited by the Examiner are all centrifugal rotational friction brakes, i.e. the brake is actuated by the angular speed of the rotating body. In contrast, the rotational friction brake of the invention is actuated by the rate of change of the angular speed, i.e. the time derivative of the speed, and relies on utilizing the inertia to initiate motion of the braking arm. This will for example mean that embodiments of the rotational friction brake of the invention may be arranged so as to be actuated at very low speeds but at high acceleration, or at very high speeds where acceleration goes to a deceleration etc. Such a behavior is not possible for a centrifugal rotational friction brake, which will introduce an increasing braking power as function of increasing angular speed, which results in the actuation of the brake to occur at a specific rotational speed. Furthermore, the invention enables higher angular speeds as it only applies brake force when the rotating second body is changing is rotational speed and, additionally, provides an anti-locking functionality allowing it to function in any rotational speed. This is especially needed in fishing reels to allow longer casts without backlash and is achieved through the following unique characteristics of the invention here described in terms of a fishing cast:
1. Lure is accelerated at beginning of cast and fishing line is being pulled off and accelerates the spool
2. The invention is deactivated through mass inertia during acceleration
3. The lure is decelerated by wind resistance and gravitational forces
4. Plurality of line is being fed out due to spool inertia
5. Spool inner friction causes deceleration and activates the invention through mass inertia i.e. when the line stops pulling
6. Friction applied by the invention brakes the spool and thus allow the spool to pick up any line slack
7. When all line slack is picked up the lure, through the line, accelerates the spool again
8. The invention is deactivated due to acceleration and mass center inertia
The above sequence described in points 3-8 is repeated until the rotational speed equals zero. This is totally opposite to pure centrifugal brakes as they will continuously apply brake force until rotational speed = 0 as they are activated and regulated by centrifugal forces alone."
I hope the description above clarifies things and with the conceptual image of the Alphabrake below it should be even clearer. We'll also make an English website as soon as possible.