Archery Bowstring Release Cam Mechanism
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Solution Overview
Problem
Existing bowstring releases suffer from unequal jaw movement and lack of smooth actuation, leading to decreased shooting accuracy and noise due to manufacturing tolerances and jaw actuation mechanisms.
Innovation Solution
The design features symmetrical jaws rotating about a common pivot, a cam mechanism with a driving surface for even jaw actuation, and a trigger system that translates and rotates to open the jaws smoothly, ensuring equal movement and noise-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional jaw actuation mechanisms are used, then the release can grip and release the bowstring, but the jaws move unequally leading to decreased shooting accuracy
Solution Approach 1:
The patent applies asymmetry in reverse - by designing perfectly symmetrical jaws with identical geometry and mounting them symmetrically about the cam axis, the invention eliminates the unequal jaw movement problem. The symmetrical configuration ensures both jaws move equally during actuation, preventing the bowstring from rolling off and improving shooting accuracy.
Solution Approach 2:
Instead of using complex linkages or separate actuation mechanisms for each jaw, the invention inverts the approach by using a single cam mechanism that inherently provides equal movement to both jaws through its symmetrical geometry. The cam's profile directly controls both jaws simultaneously, eliminating the need for additional equalizing mechanisms.
2Ease of operation
If conventional trigger actuation systems are used, then the release can be actuated, but clicking or grinding noise is generated during jaw opening
Solution Approach 1:
The invention uses a dynamic cam profile that is specifically designed to control the jaw opening motion. The cam's curved surface provides a smooth, progressive actuation that eliminates sudden movements and impacts. As the trigger is pulled, the cam rotates and gradually opens the jaws, maintaining continuous contact between the cam and jaw actuation points, which eliminates clicking and grinding noises.
Solution Approach 2:
The cam mechanism employs curved surfaces instead of flat or angular contacts. The cam's rotated profile creates a smooth arc of motion that guides the jaws open gradually. This curvature ensures continuous, smooth contact between moving parts, eliminating the abrupt engagements that cause noise in conventional trigger systems.
3Ease of manufacture
If manufacturing tolerances are present in jaw components, then mass production is feasible, but unequal jaw movement and rough actuation occur
Solution Approach 1:
The invention changes the geometric parameters of the cam profile to compensate for manufacturing tolerances. By designing the cam with specific curvature radii and profile characteristics, the system provides a larger margin for error in jaw component dimensions. The cam's geometry inherently equalizes small variations in jaw mounting positions or dimensions, maintaining smooth actuation even when components are within normal manufacturing tolerances.
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
This configuration ensures symmetrical jaw movement, reduces noise, and provides a smooth, accurate release of the bowstring, enhancing shooting precision and comfort.
Implementation Method 1
a cam 106/206, wherein the cam 106/206 has a driving surface 116/216 that acts on the jaw tail ends 112/212 to rotate the jaws 104/204 when the cam 106/206 moves
Implementation Method 2
a spring 126/226 that urges the jaws 104/204 toward a closed position
Data Source
AI summary
An archery bowstring release includes a pair of bowstring-gripping jaws actuatable by a trigger, with the trigger and jaws both being pivotally linked to the housing. A cam situated within the housing has a trigger cam pivot which translates and rotates with respect to the trigger, such that the cam is urged by actuation of the trigger to open and close the jaws. The forward part of the housing bearing the jaws may be rotatable with respect to the rear part of the housing, such that the plane in which the jaws move can be rotated with respect to the plane in which the trigger moves.