Patent ID: 8297267

Claim:
A unit for fastening a bowstring of a throwing device, containing: a first pulley mounted for rotation on an axis of rotation of the first pulley having a first and a second essentially cylindrical peripheral surfaces, a second pulley mounted for rotation on an axis of rotation of the second pulley, spaced apart from the axis of rotation of the first pulley, having a first and a second essentially cylindrical peripheral surfaces, a bowstring for throwing a projectile, wherein the bowstring for throwing a projectile has a one end fixed to the first pulley, and an other end fixed to the second pulley so the bowstring for throwing a projectile is, at least, partly wrapping the first essentially cylindrical peripheral surfaces of the first and the second pulleys, a first tension bowstring, a second tension bowstring, a first element for fastening the first tension bowstring, mounted on the axis of rotation of the first pulley, the first element for fastening the first tension bowstring being a separated element, independent from the first pulley, the first tension bowstring fastening to it at a distance from the axis of rotation of the first pulley, and a second element for fastening the second tension bowstring, mounted on the axis of rotation of the second pulley, the second element for fastening the second tension bowstring being a separated element, independent from the second pulley, the second tension bowstring fastening to it at a distance from the axis of rotation of the second pulley, wherein the first tension bowstring has a one end fixed to the first element for fastening the first tension bowstring, and an other end fixed to the second pulley so the first tension bowstring is, at least, partly wrapping the second peripheral surface of the second pulley, the second tension bowstring has a one end fixed to the second element for fastening the second tension bowstring, and an other end fixed to the first pulley so the second tension bowstring is, at least, partly wrapping the second peripheral surface of the first pulley and intersects the first tension bowstring, and when rendering the throwing device to a cocked position the bowstring for throwing a projectile intersects the first and the second tension bowstrings.