Device for propelling a projectile
First Claim
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1. A projectile launching device, comprising:
- a rigid riser;
a hand grip operatively associated with said riser;
at least one spring assembly operatively connected to said rigid riser, said spring assembly including a rotating member operatively associated therewith;
a bowstring operatively associated with said spring assembly such that each end of the bowstring is attached to the rotating member;
a projectile releasably attached to said bowstring; and
means, in addition to said bowstring, to energize said spring assembly, whereby upon release of energy stored in said spring assembly said rotating member rotates and said bowstring launches the projectile using only the energy stored in said spring assembly; and
wherein said means to energize said spring assembly comprises at least one crank arm with a first end thereof releasably connected to the spring assembly and a second end pivotally attached to a drawbar, whereby movement of said drawbar energizes the spring assembly.
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Abstract
An archery or similar projectile launching device having a spring assembly to energize the device and a release mechanism to transmit energy stored within a torsion or alternative spring to the bowstring, so as to accelerate an arrow nocked to the bowstring once the trigger is released. In one embodiment, conjoined cranks wind a torsion spring within a spring motor affixed along the riser of the bow while the bowstring and arrow are concurrently brought into the discharge position. A mechanical advantage may be achieved with the cranking mechanism to reduce the effort exerted by the archer and thereby increase accuracy, velocity and ease of use.
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Citations
19 Claims
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1. A projectile launching device, comprising:
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a rigid riser; a hand grip operatively associated with said riser; at least one spring assembly operatively connected to said rigid riser, said spring assembly including a rotating member operatively associated therewith; a bowstring operatively associated with said spring assembly such that each end of the bowstring is attached to the rotating member; a projectile releasably attached to said bowstring; and means, in addition to said bowstring, to energize said spring assembly, whereby upon release of energy stored in said spring assembly said rotating member rotates and said bowstring launches the projectile using only the energy stored in said spring assembly; and wherein said means to energize said spring assembly comprises at least one crank arm with a first end thereof releasably connected to the spring assembly and a second end pivotally attached to a drawbar, whereby movement of said drawbar energizes the spring assembly. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An archery bow, comprising:
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a riser; a hand grip adjustably affixed to said riser; at least one spring assembly operatively connected to said riser, said spring assembly including a spring and a rotating member operatively associated therewith; a bowstring operatively associated with said spring assembly such that each end of the bowstring is attached to the rotating member; an arrow releasably attached to said bowstring; and a pair of engaged spring cranks releasably connected to said spring assembly to energize said assembly and rotate said rotating member in a first direction, where upon release of energy stored in said spring said rotating member rotates in a second direction, opposite the first direction and independent of said spring cranks, applying increased tension to the bowstring and launching the arrow. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method for drawing and releasing a bow to propel an arrow, comprising:
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applying a linear drawing force to move a pair of engaged spring cranks, at least one of the cranks being releasably connected to a spring assembly, to energize said spring assembly by rotating a member attached to said spring assembly in a first radial direction; concurrently drawing a bowstring, with an arrow nocked thereto, said bowstring having each end thereof attached to the member; decoupling the spring assembly from the spring crank; and releasing energy stored in said spring wherein said member rotates in a second direction, opposite the first direction, and said bowstring propels the arrow. - View Dependent Claims (16, 17, 18, 19)
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Specification