Compound archery bow

Details Compound archery bow Compound archery bow

1978-05-22

1980-05-20

Browne, William R.

Mechanical guns and projectors

Spring

Bow

124 88, 124 90, F41B 500

Patent

active

042034124

ABSTRACT:
An archery bow wherein the draw weight increases as a function of draw displacement to a point just short of maximum draw displacement, such that the draw weight is substantially reduced at maximum draw string displacement.
First and second levers fixed together at approximately a 90 degree angle are rotatably coupled to a support arm fixed to the bow body. The bow string is anchored at each end to the first lever ends and disposed about pulleys connected at the bow limb ends. Separate limb tension cables are anchored between the limbs and pivotal rollers connected at the ends of the second lever. Rotation of the second lever (and pivotal rollers) approximately 90 degrees by displacing the bow string toward its maximum position causes each roller to move onto a fixed flat surface, substantially reducing the draw weight on the bow string just short of maximum draw displacement. Each roller-receiving flat surface, which is fixed to the support arm has a surface inclination relative to the tensional pull direction of each tension cable from the bow limb. When the rollers are engaged on the flat surface, maximum draw weight is significantly reduced.
In an alternate embodiment, the surface angle of inclination of the roller receiving surface is variable by a thumb engaging bar to vary the substantially reduced draw weight at maximum draw displacement between 0 to approximately 15 pounds.

REFERENCES:
patent: 3967609 (1976-07-01), Frydenlund
patent: 3989026 (1976-11-01), Nishioka
patent: 4103667 (1978-08-01), Shepley

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