Draw Extending Archery System With Multi-Stroke Energy Accumulation
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Solution Overview
Problem
The limitations of traditional compound bows in terms of energy output are constrained by user strength and reach, limiting arrow speed and projectile weight, as energy storage is directly tied to user capability rather than material strength and mechanical efficiency.
Innovation Solution
A draw extending system that allows multiple draw strokes to store energy in flexible limbs, extending effective draw length and adjusting leverage to increase energy storage beyond user physical limitations, enabling greater arrow speeds and heavier projectiles with manageable draw weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single draw compound bow is used, then the bow structure is simple and easy to operate, but the energy output is limited by user strength and reach
Solution Approach 1:
The bow system segments the energy storage process into multiple discrete draw strokes. Each draw stroke adds energy incrementally to the limbs, allowing the user to build up total energy output beyond what a single draw can achieve. The transmission mechanism segments the conversion of linear draw motion into rotational limb compression, enabling cumulative energy storage across multiple strokes.
Solution Approach 2:
The system performs preliminary action by requiring the user to complete multiple draw strokes before the shot is fired. Each draw stroke pre-charges the limbs further, storing energy in advance of the actual shot. This preliminary multi-stroke charging process allows energy accumulation that exceeds human physical limits for a single draw.
2Power
If multiple draw strokes are used to store energy, then arrow speed and projectile weight can be increased, but the device complexity increases
Solution Approach 1:
The transmission mechanism acts as an intermediary between the draw string and the limbs. It mediates the energy transfer by converting the linear motion of multiple draw strokes into rotational compression of the limbs. This intermediary mechanism enables efficient energy accumulation without requiring direct complex interactions between the user and the limb structure.
Solution Approach 2:
The transmission mechanism serves multiple functions: it converts linear draw motion to rotational limb compression, accumulates energy from multiple strokes, controls the timing of energy release, and maintains mechanical advantage throughout the process. This multi-functionality reduces the need for separate components for each function, thereby managing overall device complexity.
3Power
If multiple draw strokes are used to store energy, then arrow speed and projectile weight can be increased, but the device complexity increases
Solution Approach 1:
The transmission mechanism acts as an intermediary between the draw string and the limbs. It mediates the energy transfer by converting the linear motion of multiple draw strokes into rotational compression of the limbs. This intermediary mechanism enables efficient energy accumulation without requiring direct complex interactions between the user and the limb structure.
Solution Approach 2:
The transmission mechanism serves multiple functions: it converts linear draw motion to rotational limb compression, accumulates energy from multiple strokes, controls the timing of energy release, and maintains mechanical advantage throughout the process. This multi-functionality reduces the need for separate components for each function, thereby managing overall device complexity.
4Power
If draw length is extended through multiple inputs, then energy storage increases, but the effective draw length exceeds user reach
Solution Approach 1:
The transmission mechanism transforms the problem from a linear dimension issue to a rotational dimension solution. Instead of requiring the user to physically reach a longer linear draw length, the system uses rotational motion of the limbs and transmission components to accumulate energy from multiple shorter linear strokes. This dimensional transformation allows energy storage equivalent to a very long draw without requiring the user's arm to extend that far.
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 users to achieve higher arrow speeds and utilize heavier projectiles by shifting energy output limitations from user capability to material strength and mechanical efficiency, allowing for increased energy storage and reduced user effort through adjustable leverage mechanisms.
Implementation Method 1
A draw extending system that allows multiple draw strokes to store energy in flexible limbs
Data Source
AI summary
A draw extending archery system enables a user to draw a draw string multiple times to store energy. Embodiments of the system include a transmission that operatively engages the draw string and a flexible limb. From an initial rest position, the user initiates a charging stroke on the draw string. During a first charging stroke, the transmission engages to store energy during the draw. At the end of the charging stroke, the transmission engages to prevent release of stored energy. The transmission also disengages the draw string to enable a subsequent charging stroke from an intermediate rest position. From a final rest position, the user initiates a firing stroke on the draw string. At the end of the firing stroke, the transmission couples the draw string and the flexible limb to release stored energy through the draw string.