Compound Bow Servicing String for Press-Free Cable Changes
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Solution Overview
Problem
Servicing and maintenance of compound archery bows typically require a bow press to relieve tension from the bowstring and cable segments, which is a large and cumbersome machine.
Innovation Solution
A compound archery bow design incorporating a servicing string that allows for the change of bowstring and power cables without the need for a bow press, utilizing rotatable members and a servicing string to manipulate the bow's rotatable members to relieve tension, enabling the installation and removal of bowstrings and power cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a bow press is used to relieve tension from the bowstring and cable segments, then the bowstring and cables can be changed, but the equipment required becomes large and cumbersome
Solution Approach 1:
The patent extracts the tension-relief function from the large bow press machine and implements it through a portable tensioning device that can be attached directly to the bow. This allows the bowstring and cable replacement process to be performed without the cumbersome bow press equipment.
Solution Approach 2:
The bow design includes integrated servicing features such as accessible cable ends, rotation stops, and tensioning mechanisms that allow the archer to perform maintenance themselves without requiring external specialized equipment like a bow press.
2Ease of repair
If a bow press is used for servicing, then tension can be relieved, but the device complexity increases
Solution Approach 1:
The complex bow press machine is replaced by extracting only the essential tension-relief function and implementing it through a simple portable tensioning device that integrates with the bow's existing structure.
Solution Approach 2:
The bow is designed with built-in servicing capabilities including rotation stops on the cam, accessible cable anchorage points, and a tensioning device that uses the bow's own structure, eliminating the need for external complex servicing equipment.
3Ease of operation
If the cam is designed to rotate freely, then the bowstring can be installed, but tension cannot be controlled during servicing
Solution Approach 1:
A rotation stop acts as an intermediary mechanism between the cam and the bowstring installation process. This rotation stop temporarily constrains the cam's rotation to allow controlled tensioning of the bowstring and cables, then can be removed or adjusted to allow free rotation for operation.
Solution Approach 2:
The cam system transitions from a static constrained state during installation (with rotation stops in place) to a dynamic free-rotating state during operation. The rotation stops provide temporary constraints that are easily applied and removed, allowing the system to adapt its degrees of freedom based on the operational phase.
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 servicing and maintenance of compound bows without the need for a bow press, simplifying the process and reducing the equipment required for servicing.
Implementation Method 1
A servicing string is arranged for attachment to the first rotatable member and arranged to bias the first rotatable member in a second rotational direction about the first axis
Implementation Method 2
A bowstring is attached to the first rotatable member and arranged to bias the first rotatable member in a first rotational direction about the first axis
Data Source
AI summary
In some embodiments, an archery bow comprises a riser, a first limb and a second limb. A first rotatable member is arranged to rotate about a first axis and a second rotatable member is arranged to rotate about a second axis. A bowstring is attached to the first rotatable member and arranged to bias the first rotatable member in a first rotational direction about the first axis. A power cable is attached to the first rotatable member. A servicing string is arranged for attachment to the first rotatable member and arranged to bias the first rotatable member in a second rotational direction about the first axis.