Bowstring Release Device With Cylindrical Bearing Jaws
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Solution Overview
Problem
Existing bowstring release devices suffer from manufacturing tolerance errors, wear, and instability, leading to inconsistent performance and increased costs due to the need for precise assembly and potential operational failures under substantial pull forces.
Innovation Solution
A bowstring release mechanism featuring pivotally connected jaws with cylindrically-shaped bearings to restrict lateral movement and allow pivotal movement, along with an adjustable trigger system to precisely control the gap between jaws, ensuring reliable retention and release of the bowstring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional pivot joints are used in jaw assemblies, then the structure is simple, but the jaws become unstable and move laterally giving a sloppy feeling
Solution Approach 1:
A bearing is introduced as an intermediary component between the jaw and pivot joint. The bearing's inner raceway engages with the pivot joint while the outer raceway engages with the jaw, mediating the connection to eliminate lateral movement. This resolves the contradiction by adding a specialized intermediary component that provides stability without significantly complicating the overall structure.
Solution Approach 2:
The traditional mechanical pivot joint connection is replaced with a bearing-based mechanical system. Instead of direct metal-to-metal contact that allows multi-axis movement, the bearing provides a controlled rotational interface that restricts movement to the intended pivot direction only, eliminating lateral sloppiness while maintaining simplicity.
2Manufacturing precision
If manufacturing tolerances are tightened to ensure proper gap control, then jaw gap precision improves, but manufacturing costs and labor increase
Solution Approach 1:
The jaw assembly incorporates adjustable components that allow the gap between jaws to be dynamically modified after manufacturing. This enables compensation for normal manufacturing tolerances without requiring extremely tight tolerances during production, thereby reducing manufacturing costs while maintaining operational precision.
Solution Approach 2:
The design allows for post-manufacturing adjustment of critical dimensional parameters, specifically the gap between jaws. By enabling parameter changes after assembly, the system can achieve required precision without the need for expensive high-precision manufacturing processes, thus resolving the contradiction between precision and ease of manufacture.
3Ease of manufacture
If cumulative manufacturing tolerances are not controlled, then manufacturing costs decrease, but assembled products fail to meet minimum requirements under substantial pull forces
Solution Approach 1:
The bearing component is designed to self-align and self-adjust within the jaw assembly, compensating for cumulative manufacturing tolerances. The bearing's geometric precision and clearance design allow it to automatically ensure proper gap control and jaw stability without requiring extremely tight tolerances on other components, thus maintaining reliability while reducing manufacturing costs.
Solution Approach 2:
The bearing assembly incorporates clearance and tolerance compensation features that were designed into the system beforehand. These features act as a cushion against cumulative manufacturing errors, ensuring that even with standard tolerances, the assembled product meets minimum performance requirements under substantial pull forces, thereby maintaining reliability without expensive manufacturing controls.
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
The solution enhances the stability and reliability of the bowstring release mechanism by reducing lateral movement and allowing for adjustable gap control, thereby improving performance under varying forces and reducing manufacturing costs by eliminating the need for tight tolerances.
Implementation Method 1
A cylindrically-shaped bearing is located in the first and second grooves to thereby laterally restrain movement of the first and second jaws while permitting pivotal movement thereof
Data Source
AI summary
A bowstring release mechanism includes first and second jaws pivotally connected to a housing with a trigger section operably associated with the jaws for moving the jaws between open and closed positions. A cylindrically-shaped bearing is located in grooves formed in the jaws to thereby laterally restrain movement of the first and second jaws while permitting pivotal movement thereof.