Arcuate Compression Members for Bow Energy Storage
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Solution Overview
Problem
Traditional archery bows, particularly compound bows, suffer from significant recoil, noise, and reduced efficiency due to the reliance on limb bending and eccentrics for energy storage, leading to wasted energy as vibrations and noise, which compromises accuracy and arrow speed.
Innovation Solution
The use of arcuate compression members on the limbs of the bow, which store and release energy efficiently, minimizing limb deformation and utilizing a primary and secondary compression element configuration to achieve nearly 100% energy transfer to the arrow, reducing recoil and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional compound bows use limb bending and eccentrics for energy storage, then let-off is achieved, but significant energy is wasted as vibrations and noise
Solution Approach 1:
The patent extracts the energy storage function from the limb bending mechanism and relocates it to dedicated compression members. The compression members are positioned to compress against the limbs during drawing, storing energy independently of limb deformation. This separation allows the limbs to remain rigid and minimizes energy loss to vibrations and noise while maintaining the let-off characteristic through the compression members' elastic recovery.
2Force
If wider and thicker limbs are used to increase draw weight, then draw weight increases, but limb weight increases decreasing efficiency
Solution Approach 1:
The patent segments the bow system into distinct functional components: rigid limbs for structural support and dedicated compression members for energy storage. The compression members are separate elements that can be optimized independently for energy storage capacity without increasing limb weight. This segmentation allows the limbs to be made lighter while the compression members provide the necessary draw weight through their elastic compression and recovery.
3Object-generated harmful factors
If stabilizers and vibration-reduced limbs are used to absorb energy, then recoil is reduced, but arrow speed decreases due to energy loss
Solution Approach 1:
The compression members are designed to automatically return stored energy to the bowstring through their elastic recovery, without requiring external vibration-damping components. The system is self-regulating, where the compression members' material properties and geometry naturally provide vibration reduction while fully recovering energy for arrow propulsion. This eliminates the need for energy-absorbing stabilizers that would reduce arrow speed.
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
The bow configuration provides substantial let-off, increased efficiency, reduced recoil, and silent operation by isolating recoil to the vertical direction, canceling out lateral recoils, and maintaining draw weight while minimizing weight and energy loss.
Implementation Method 1
a compression member used to store and release energy... the compression member includes a primary compression element in the form of an arc or crescent... As the bowstring is drawn, the compression member is compressed and a significant amount of energy is stored in the compression member. When the bowstring is released the compression member rapidly returns to its natural static state, thereby releasing the stored energy.
Data Source
AI summary
According to one embodiment, a bow includes a handle portion and a bowstring. Compression members including primary compression elements and secondary compression elements are positioned on the ends of the handle portion. The compression elements are arcuate in shape and joined at the ends. As the bowstring is drawn, the compression members are compressed and energy is stored therein. The bow can include limbs that do not significantly deform or store energy as the bow is drawn. Upon release of the bowstring, the stored energy is rapidly returned to the bowstring.