Power spring bow

An archery bow, comprising:

• a frame member having means defining a hand grip;
• a fixed arm secured on each end of the frame member and extending outwardly therefrom to a free end;
• flat wound coil spring means mounted to said frame member;
• a bow string extended between said arm free ends and having its ends connected to said flat wound coil spring means, whereby movement of said bow string from an at-rest position to a drawn position causes said spring to wind up, storing energy therein so that release of said bow string results in release of the stored energy in the coil spring to the string to return it to its initial position and thus propel an arrow nocked therein;
• and
• multiple mechanical advantage means connected between said bow string and said flat wound coil spring for reducing the force required to move the string to its drawn position against the resistance of the spring.

An archery bow, comprising:

• a frame member having means thereon defining a hand grip;
• an arm projecting outwardly from opposite ends of said frame member and terminating in outer free ends;
• spring means carried by said frame member;
• a bow string extending between said arm free ends and having an initial, at rest position and a fully drawn position, said bow string being connected to said spring means so that when the string is moved from its at rest position towards its fully drawn position it causes energy to be stored in said spring means, and release of said bow string results in the stored energy in the spring means being positioned and propelling an arrow nocked therein;
• and
• mechanical advantage means connected between said bow string and said spring means for reducing the force required to move the string to its fully drawn position against the resistance of the spring means, said mechanical advantage means serving to accelerate the movement of the string from its fully drawn position to its at-rest position when it is released, and said mechanical advantage means including a cam member connected with said spring means to be rotated thereby, said cam member comprising a let off means which reduces the force during movement of the string between its at-rest position and its fully drawn position, a drive sprocket connected to the cam member to be rotated with the cam member and a storage spool connected to the drive sprocket to be rotated with said drive sprocket for winding up and storing string when the bow is in its at-rest position, whereby the amount of draw of the bow string is affected by the amount of string wound up on the storage spool and the force required to fully draw the bow string is a function of the spring means, the cam member design and the relative dimension of the drive sprocket and the storage spool.