Compound Bow Servicing String Mechanism for Field Maintenance
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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, making it cumbersome to change or replace components without specialized equipment.
Innovation Solution
A method using a servicing string and servicing cable to retain and rotate the bow's rotatable members, allowing for the removal and installation of bowstrings and power cables without a bow press, utilizing a shorter servicing string to retain the members in a non-brace orientation and a longer servicing cable to unload the bow, enabling component changes in the field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a bow press is used to service the compound bow, then the bowstring and cable segments can be replaced, but the equipment becomes cumbersome and requires specialized machinery
Solution Approach 1:
The compound bow is equipped with a self-service mechanism where the cable itself serves as the actuating element. By pulling the cable, the bow automatically flexes its limbs to relieve tension, enabling the bowstring and cable segments to be replaced without external bow press equipment. This transforms the bow into a self-servicing system that performs its own maintenance function.
Solution Approach 2:
The cable serves multiple functions: it acts as both the power transmission element for arrow propulsion and as the actuating mechanism for limb flexing during servicing. This multi-functionality eliminates the need for separate servicing equipment, as the same cable used for shooting also enables maintenance operations.
2Ease of operation
If a bow press is used to relieve tension, then component replacement is enabled, but the process requires external equipment and tools
Solution Approach 1:
The bow system performs its own tension relief function by utilizing the cable to flex the limbs. This self-service capability eliminates the need for external bow presses and specialized tools, allowing archers to replace components in the field with minimal equipment.
Solution Approach 2:
The complex bow press machinery is extracted and replaced by a simplified cable-pulling mechanism that is already integral to the bow's structure. This extraction of unnecessary external equipment reduces the quantity of tools required while maintaining the essential servicing function.
3Reliability
If traditional servicing methods are used, then proper tension relief is achieved, but the process becomes time-consuming and requires specialized equipment
Solution Approach 1:
The automatic tension relief mechanism eliminates the time-consuming process of setting up and operating external bow presses. By simply pulling the cable, the bow quickly and reliably relieves tension, significantly reducing servicing time while maintaining effectiveness.
Solution Approach 2:
The system changes the physical state of the bow limbs by flexing them through cable tension, thereby altering the tension parameters in the bowstring and cable segments. This parameter change enables safe component removal without requiring prolonged servicing procedures.
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 archers to perform complete unstringing and replacement of strings and cables without tools or external components, allowing for maintenance and repairs in the field without the need for a bow press, simplifying the process and reducing equipment requirements.
Implementation Method 1
The servicing string retains the first rotatable member and the second rotatable member in a non-brace orientation
Implementation Method 2
The servicing cable is let down, unloading the compound archery bow. In some embodiments, letting down the servicing cable comprises rotating the first rotatable member and second rotatable member past their orientations in a brace condition
Data Source
AI summary
In some embodiments, a method comprises attaching a servicing string to the first rotatable member and the second rotatable member of a compound archery bow. The servicing string retains the first rotatable member and the second rotatable member in a non-brace orientation, for example in a partially drawn orientation. The bowstring is removed from the compound archery bow. A servicing cable is attached to the first rotatable member and the second rotatable member, and the servicing string is detached from at least one of the first rotatable member or the second rotatable member. The servicing cable is let down, unloading the compound archery bow.