Unit for fastening of the bowstring throwing devices (variants)

A unit for fastening a bowstring of a throwing device, containing:

• a first pulley mounted for rotation about an axis of rotation of the first pulley and having a first, a second and a third essentially cylindrical peripheral surfaces,
• a second pulley mounted for rotation about an axis of rotation of the second pulley, spaced apart from the axis of rotation of the first pulley, and having a first, a second and a third essentially cylindrical peripheral surfaces,
• a bowstring for throwing a projectile,
• a first tension bowstring,
• a second tension bowstring,
• 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 peripheral surfaces of the first and the second pulleys,
• the first tension bowstring having a one end fixed to the first pulley, and an other end fixed to the second pulley so the first tension bowstring is, at least, partly wrapping the second peripheral surfaces of the first and the second pulleys,
• the second tension bowstring having a one end fixed to the second pulley, and an other end fixed to the first pulley so the second tension bowstring is, at least, partly wrapping the third peripheral surfaces of the first and the second pulleys,
• wherein said first, second and third essentially cylindrical peripheral surfaces of the first pulley are situated in different planes perpendicular to the axis of rotation of the first pulley, and
• said first, second and third essentially cylindrical peripheral surfaces of the second pulley are situated in different planes perpendicular to the axis of rotation of the second pulley, and
• wherein said first essentially cylindrical peripheral surface of the first pulley is situated above said second and third essentially cylindrical peripheral surfaces of the first pulley, and
• said first essentially cylindrical peripheral surface of the second pulley is situated above said second and third essentially cylindrical peripheral surfaces of the second pulley, and
• said second and third essentially cylindrical peripheral surfaces of the first pulley to which the ends of the bowstrings situated in the same planes are fixed are situated at different distances from the axis of rotation of the first pulley, and
• said second and third essentially cylindrical peripheral surfaces of the second pulley to which the ends of the bowstrings situated in the same planes are fixed are situated at different distances from the axis of rotation of the second pulley,
• thus when rendering the throwing device to a cocked position the bowstring for throwing a projectile intersects the first and the second tension bowstrings.