Archery Bow Limb Riser Joint Eccentric Locator
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Solution Overview
Problem
The conventional joint between the limb and handle riser of an archery bow leads to vibration, instability in arrow flight, and misalignment due to increased load and machining inaccuracies, requiring complex and time-consuming adjustments.
Innovation Solution
The joint design incorporates a projection from either the limb or handle riser with a housing part of decreasing diameter, allowing for easy adjustment and correction of inclination using an eccentric locator, preventing vibration and improving alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the limb and handle riser are joined using conventional fitting parts, then the joint can be assembled, but the limb vibrates left and right during use due to joint vibration
Solution Approach 1:
The patent employs a spherical lock part (515) that fits into a corresponding spherical recess (527) to eliminate lateral vibration. The spherical geometry provides point contact that prevents the limb from vibrating left and right while maintaining rotational freedom for adjustment, directly resolving the joint stability issue.
Solution Approach 2:
The joint is divided into multiple functional components: a limb bolt (522) for primary attachment, a lock part (515) for preventing lateral movement, and an eccentric locator (538) for alignment correction. This segmentation allows each component to address specific aspects of joint stability independently.
2Ease of manufacture
If conventional fitting parts are used to join the limb and handle riser, then assembly is possible, but machining inaccuracies cause misalignment requiring complex adjustments
Solution Approach 1:
The eccentric locator (538) changes the positional parameter of the lock part relative to the center of the second fitting part. By making the locator positionable at different eccentric distances, the system can compensate for machining inaccuracies and achieve proper alignment without requiring high-precision manufacturing.
Solution Approach 2:
The eccentric locator is designed to be adjustable and repositionable, allowing dynamic correction of alignment issues. This transforms a static, fixed-position system into a dynamic one that can adapt to manufacturing variations through simple repositioning rather than complex adjustments.
3Ease of operation
If the limb and handle riser are joined with conventional fitting parts, then the joint can be assembled, but the adjustment process is time-consuming and complex
Solution Approach 1:
The eccentric locator is pre-positioned at an offset from the center, allowing the lock part to be inserted and the limb to be aligned in a single motion. This preliminary positioning eliminates the need for multiple adjustment steps, significantly reducing adjustment time and complexity.
Solution Approach 2:
The eccentric locator acts as an intermediary mechanism between the lock part and the centerline of the second fitting part. It mediates the alignment process by providing a predetermined offset that guides the limb into proper alignment, simplifying the adjustment procedure.
Data Source
AI summary
At a second fitting part, inclination of the limb can be easily adjusted and corrected by an eccentric locator. The archery bow is characterized in that: the limb-side second fitting part of a limb has a projection with a convex cross section protruding from the surface of the limb of the limb-side second fitting part; the handle riser-side second fitting part of a handle riser has a housing part with a concave cross section to house the projection with a convex cross section; in the housing part, a side face near a bottom is smaller in diameter than an opening; and the limb and the handle riser are joined by joining the limb-side first fitting part and the handle riser-side first fitting part and joining the limb-side second fitting part and the handle riser-side second fitting part. The limb and handle are prevented from vibrating left and right.