Self-tunable Compound Bow Cam Alignment Mechanism
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Solution Overview
Problem
Conventional compound bows face challenges in maintaining identical rotational angles of upper and lower cams, leading to inconsistent arrow shooting power and accuracy, as adjusting cam cable lengths to match these angles is difficult for bowyers.
Innovation Solution
A self-tunable compound bow design featuring upper and lower pulley assemblies with contact pins and indicators that allow bowyers to set and verify identical rotational angles of cams, using a contact pin and indicator system to adjust cam cable lengths and display positions, ensuring symmetrical cam rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cam cable lengths are adjusted to match rotational angles of upper and lower cams, then arrow shooting accuracy is improved, but the difficulty of adjustment and measurement increases
Solution Approach 1:
The patent introduces indicator members that act as intermediaries to visually represent the rotational angles of the cams. These indicators are coupled to the cams and extend radially outward, providing a clear visual reference that eliminates the difficulty of directly measuring rotational angle differences. The indicators serve as mediators between the cam rotation and the bowyer's ability to assess alignment.
Solution Approach 2:
The patent replaces complex mechanical measurement methods with a visual indication system. Instead of requiring precise mechanical measurement tools or complex procedures to determine rotational angle differences, the system uses visual indicators that can be easily observed and compared, substituting mechanical measurement complexity with simple visual assessment.
2Manufacturing precision
If cam cable lengths are manually adjusted by bowyers, then rotational angle matching is achieved, but the ease of operation decreases
Solution Approach 1:
The patent implements a visual feedback mechanism through the indicator members that show the bowyer the current rotational angles of the cams in real-time. This feedback allows the bowyer to immediately see the effect of cable length adjustments and make precise corrections, greatly simplifying the adjustment process. The indicators provide continuous visual information about the alignment status, enabling intuitive adjustments without complex measurement procedures.
Solution Approach 2:
The indicator members are designed to automatically display the rotational angle information without requiring additional tools or procedures. The system serves itself by providing built-in visual references that enable the bowyer to perform the alignment task independently and easily, without needing external assistance or complex measurement equipment.
3Reliability
If rotational angles of upper and lower cams are kept identical, then arrow shooting power consistency is improved, but the device complexity increases
Solution Approach 1:
The patent divides the alignment indication function into separate indicator members for each cam. Each indicator is independently coupled to its respective cam and provides visual information about that cam's rotational angle. This segmentation allows for simple, modular implementation where each indicator is an independent element, avoiding the need for a complex integrated alignment mechanism.
Solution Approach 2:
The indicator members serve multiple functions: they indicate rotational angle, provide visual reference for alignment, and can guide adjustment procedures. This multi-functionality reduces the need for separate alignment tools or mechanisms, maintaining system simplicity while achieving reliable cam angle matching.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables bowyers to easily set and verify identical rotational angles of upper and lower cams, improving arrow shooting consistency and accuracy by allowing precise adjustment of cam cable lengths.
Implementation Method 1
by using an effect of a cam or wheel, to thus result in a fast speed of an arrow and have very strong power
Implementation Method 2
upper and lower pulleys 30 and 36 are rotated and thus the cams 32 and 38 coupled to the lower and upper pulleys 30 and 36 are rotated
Data Source
AI summary
Provided is a self-tunable compound bow including: a bow main body including a pair of limbs that are respectively coupled to both ends of a handle; upper and lower pulley assemblies that are respectively coupled to the rear end of each limb; a bowstring; and first and second cam cables that are wound around a cam of each of the upper and lower pulley assemblies as the bowstring is pulled. A contact pin is formed in one of the pulley assemblies, in which the contact pin is in contact with the first cam cable when the bowstring is pulled, and an indicator is formed in the other of the pulley assemblies, in which the indicator is in contact with the second cam cable and moves when the bowstring is pulled in a guide hole formed in the pulley of the other of the pulley assemblies.