Fig. 2
From: Fall inducing movable platform (FIMP) for overground trips and slips
The trip brake mounted on the back of the FIMP. When the brake (red box) is activated, it stops the reel (blue box) from rotating and it prevents the ankle from advancing via the ankle cable tied around the reel. The wire rope is kept taut at all times with a power spring within the reel. A shaft runs through the entire assembly to keeps the reel, power spring and electromagnetic brake concentric with each other