Crossbow with draw string stop

The string guide system with helical take-up journals and journals allows for increased rotation and power stroke in bows and crossbows, addressing the limitations of conventional designs by enhancing energy storage and mechanical advantage.

US20250102264A1Pending Publication Date: 2025-03-27RAVIN CROSSBOWS LLC
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Patent Information

Application Number
US18/972248
Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Priority Date
2015-10-22
Filing Date
2024-12-06
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

Conventional bows and crossbows have limited power stroke due to the design of string guides and power cables, which restrict the rotation of cams to about 270 degrees, limiting the mechanical advantage and energy storage capacity.

Method used

The implementation of a string guide system with helical power cable take-up journals and draw string journals that allow the power cables to wrap around the cams for more than 360 degrees, enabling increased rotation and power stroke without enlarging the bow's diameter, thereby extending the power stroke by at least 25% and optimizing draw force versus draw distance.

Benefits of technology

This configuration enhances the power stroke by up to 40% while maintaining a compact bow design, allowing for greater energy storage and let-off at full draw, improving the mechanical advantage and efficiency of the bow's operation.

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Abstract

The crossbow includes a center rail, and a first flexible limb and a second flexible limb coupled with the center rail. The crossbow includes a first cam and a second cam rotatably coupled with the first flexible limb and the second flexible limb, respectively. The crossbow includes a draw string coupled with the first cam and the second cam. The crossbow includes a first cable anchor coupled to the first side of the center rail and a second cable anchor coupled the second side of the center rail. The crossbow includes a first power cable engaged with the first cam and the first cable anchor, and a second power cable engaged with the second cam and the second cable anchor. The crossbow includes a first draw string stop coupled to first cable anchor and a second draw string stop coupled to the second cable anchor.
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