Broadhead Blade Lock Mechanism for Reliable Deployment
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Solution Overview
Problem
Current mechanical broadheads face issues with premature blade deployment due to high momentum energy requirements, leading to reduced accuracy and penetrating power, especially when used with lower poundage bows, and are often not reusable due to sacrificial design.
Innovation Solution
A broadhead blade lock and release apparatus utilizing an internal spring pressure device to minimize the energy needed to unlock blades, allowing them to rotate and open fully upon impact, maximizing kinetic energy transfer for efficient penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical broadhead closure mechanisms are strengthened to prevent premature blade deployment, then blade control reliability is improved, but the momentum energy required to overcome the closure mechanism increases significantly, reducing penetrating power
Solution Approach 1:
The blade is pre-positioned in a closed state within the broadhead body, with the closure mechanism already in place to maintain this state during flight. The blade only needs to overcome a small portion of the closure mechanism's holding force at impact, rather than the full strength, because the mechanism is designed to fail open easily once a threshold is reached. This preliminary positioning reduces the energy barrier at the critical moment of impact.
Solution Approach 2:
The closure mechanism's holding force is designed to change parameters under different conditions - maintaining strong closure during flight but becoming easier to overcome at impact. The mechanism uses friction-based holding that decreases effective resistance when the blade begins to open, transforming the energy requirement from a high static barrier to a lower dynamic threshold, thus preserving penetrating power while maintaining reliability.
2Loss of energy
If the closure mechanism is designed to be easily overcome at impact to preserve penetrating power, then energy efficiency is improved, but the blade may deploy prematurely during flight, reducing accuracy
Solution Approach 1:
The closure mechanism is designed with dynamic characteristics that differentiate between flight conditions and impact conditions. During flight, the mechanism maintains a stable closed state through controlled friction and mechanical interference. At impact, the sudden change in force application and the natural motion of the blade interact with the closure mechanism to create a controlled transition to the open state, ensuring deployment only when needed without premature activation.
Solution Approach 2:
The closure mechanism acts as an intermediary element between the blade and the broadhead body, mediating the transition from closed to open state. It provides a controlled interface that requires a specific threshold of force to overcome, acting as a buffer that prevents premature deployment while allowing efficient energy transfer at impact. The mechanism's design creates a clear distinction between the force required during flight versus the force available at impact.
3Productivity
If higher arrow velocities are used to improve accuracy and kill efficiency, then hunting effectiveness is improved, but significant acceleration forces are introduced that cause erratic blade behavior and reduce accuracy
Solution Approach 1:
The blade is pre-positioned and secured in a closed state within the broadhead body before impact occurs. The closure mechanism is already in place to maintain this precise positioning during high-velocity flight, preventing any blade movement that would cause accuracy errors. The blade only begins to open after impact, eliminating the problem of acceleration forces affecting blade position during the critical flight phase.
4Reliability
If sacrificial blade holding mechanisms are used to ensure reliable blade deployment, then blade release reliability is improved, but the broadhead cannot be reused, increasing loss of substance
Solution Approach 1:
The blade holding mechanism is designed to be recoverable rather than sacrificial. The closure mechanism maintains the blade in a closed state during flight and can be reset after impact, allowing the same broadhead to be reused multiple times. The mechanism's design enables it to withstand repeated cycling between closed and open states without degradation, eliminating the need to discard the broadhead after a single use and reducing material loss.
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 solution ensures maximum penetration and cutting surface exposure while maintaining accuracy and structural integrity, allowing for effective use with a range of bow weights and preventing premature blade deployment, thus enhancing humane hunting efficiency.
Implementation Method 1
An internal spring pressure device minimizes the energy needed to unlock the blades
Implementation Method 2
This minimum amount of energy is transferred to improve mechanical advantage to compress the blade slightly. This slight movement of compressing a blade or plurality of blades frees the mechanical connection of the blade with the blade lock.
Data Source
AI summary
An alternative broadhead blade lock and release apparatus and method consisting of a support body with a tip assembly with a nosetip. A blade is attached with the support body such that the blade is movable from a first position to a second position. A pressure device is connected with the blade where the pressure device is configured to pressure the blade to the second position and a locking pin is connected with the nosetip such that when the blade is connected with the locking pin the locking pin is in locking position and the blade is held in the first position by the pressure on the blade to the second position and where pressure on the blade toward the support body releases the blade from the locking pin such that the pressure device pressures the blade to rotate to the second position.