Bow With Cable Cam Energy Storage
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Solution Overview
Problem
Conventional bows requiring elastic force from limbs for arrow shooting are cumbersome and difficult to store due to their size and shape, limiting flexibility in design and adjustment.
Innovation Solution
A bow design utilizing a cable-based elastic force accumulation system with pulleys and cams, allowing for compact storage and adjustable shape, where the cables are elastically deformed to store energy efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the bow body is formed in an arch shape to accumulate elastic force, then the elastic force can be accumulated in the bow body, but the entire length of the bow body becomes approximately same as the entire length of the bow, making it difficult to downsize for storage and carrying
Solution Approach 1:
The bow is divided into separate functional components: a compact frame structure and separate cable systems. The elastic force accumulation function is segmented from the main bow body and assigned to cables that can be independently managed and stored, allowing the frame to be compact while maintaining energy storage capability.
Solution Approach 2:
Cables are introduced as intermediary elements between the frame and the energy storage mechanism. These cables can be elastically deformed to accumulate energy while being arranged linearly, separating the energy storage function from the structural form of the bow body itself.
2Device complexity
If the bow body shape is fixed to accumulate elastic force, then the structure is simple, but it is not easy to finely adjust the shape of the bow according to the preference of a shooter
Solution Approach 1:
The bow design incorporates movable and adjustable components, particularly in the cable routing and cam mechanisms. This allows the effective length and geometry of the bow to be dynamically adjusted without changing the fundamental frame structure, enabling customization while maintaining structural simplicity.
Solution Approach 2:
The bow components are segmented into modular elements (frame, cables, cams, pulleys) that can be independently adjusted or reconfigured. This modularity allows shooters to fine-tune the bow's characteristics by adjusting individual components rather than redesigning the entire structure.
3Volume of stationary object
If cables are arranged in a linear shape between cams to accumulate elastic force, then the elastic force can be accumulated in a smaller mechanism, but the mechanism requires multiple cams and pulleys increasing device complexity
Solution Approach 1:
The cams and pulleys in the system serve multiple functions: they guide the cables, provide mechanical advantage, enable compact winding of the elastic cables, and allow for adjustable geometry. This multi-functionality reduces the need for additional specialized components, balancing complexity with functionality.
Solution Approach 2:
The cable system is arranged to nest within the frame structure, with cables passing through and around various components in a compact configuration. The linear arrangement of cables between cams allows them to be stored in a compact manner when not in use, reducing the overall volume occupied by the mechanism.
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 a compact and flexible bow design that efficiently converts energy for arrow shooting without the need for limb deformation, facilitating easy storage and adjustment according to user preference.
Implementation Method 1
a first cable arranged in a linear shape between the first small diameter cam and the second large diameter cam, the first cable being configured to be elastically deformed by being wound around the second large diameter cam when the string is pulled
Data Source
AI summary
A bow including: a frame having a predetermined length; a first pulley and a second pulley arranged on a first position and second position of the frame respectively; a first small diameter cam and a first large diameter cam rotated interlocked with the first pulley; a second small diameter cam and a second large diameter cam rotated interlocked with the second pulley; a string fixed to the first pulley and the second pulley, the first pulley and the second pulley being rotated when the string is pulled; a first cable and a second cable arranged in a linear shape between the first (second) small diameter cam and the second (first) large diameter cam, the first cable and the second cable being elastically deformed by being wound around the second large diameter cam or the first large diameter cam when the string is pulled.