Mechanical Broadhead Adjustable Expansion Mechanism
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Solution Overview
Problem
Current mechanical broadheads face limitations in inflicting maximum damage to vital areas due to uncontrolled blade expansion, delayed expansion after penetration, and inability to adjust expansion based on target distance and bow draw weight, leading to inefficient energy transfer.
Innovation Solution
A mechanical broadhead with adjustable blade expansion, featuring a body with an inner recess and pivot point for blade attachment, allowing for controlled expansion via a rotating base that adjusts the blade's expansion width based on user settings, ensuring blades expand quickly after penetration and maximize energy transfer to vital areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If blades expand immediately upon impact, then larger wound channel is created, but more energy is lost penetrating the rib cage rather than reaching vital areas
Solution Approach 1:
The broadhead is designed with blades in a retracted position before impact, preparing the structure for controlled expansion. The expansion mechanism is pre-loaded with spring force that will activate only after penetration, ensuring the blades expand at the optimal moment rather than immediately upon impact.
Solution Approach 2:
The broadhead transitions from a static retracted state to a dynamic expanded state after penetration. The blades are designed to rotate outward on pivot points, changing from a compact aerodynamic configuration to an expanded wound-channel configuration based on the operational phase.
2Loss of energy
If blades are kept retracted, then aerodynamic drag is reduced, but expansion may be delayed after penetrating the target
Solution Approach 1:
The expansion mechanism is pre-loaded with spring force that counteracts the retraction forces. This preliminary energy storage ensures that once the retention mechanism releases, the blades expand rapidly without significant delay, preventing the harmful effect of expansion lag while maintaining the benefit of reduced drag during flight.
Solution Approach 2:
The blades are designed to expand quickly through a rapid rotation motion on pivot points, rushing through the expansion process immediately after penetration. This minimizes the time the blades remain in a transitional state, ensuring swift transition to the expanded configuration.
3Ease of manufacture
If blade expansion width is fixed, then manufacturing is simplified, but expansion cannot be optimized for different target distances and bow draw weights
Solution Approach 1:
The broadhead incorporates an adjustable retention mechanism that allows the expansion width to be changed by the user. The retention element can be positioned at different locations along the blade, dynamically adjusting the expansion geometry to match different hunting conditions, target distances, and bow draw weights while maintaining a relatively simple overall structure.
Solution Approach 2:
The expansion characteristics of the broadhead can be modified by changing the position of the retention element relative to the pivot points. This parameter adjustment allows optimization of blade expansion width and timing for different operational requirements without requiring complete redesign of the broadhead structure.
Data Source
AI summary
The invention is a Mechanical Broadhead with adjustable expansion and related methods for using the mechanical broadhead are disclosed. According to an aspect, a mechanical broadhead includes a body that defines an interior space for holding the blades. The broadhead also includes an expansion adjustment mechanism. The blades each define a protrusion that extends substantially along a length of the body. The rotation of the first blade and the second blade extends in substantially opposing directions. The broadhead also includes a protruding member that prevents reverse rotation. The blade mechanisms comprise a resilient member that engages upon impact for starting rotation of the first and second blades after target penetration. The blade mechanisms comprise a blade tip member that engages after initial rotation for completing rotation. The adjustment feature prevents further rotation of the first and second blade to a desired blade expansion width.