Speargun Drive System Below Spear for Clear Aiming
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Solution Overview
Problem
Conventional rubber band powered spearguns are either large and unwieldy or small and underpowered, lacking a compact design that provides a clear line of sight for aiming.
Innovation Solution
A sportfishing speargun design with a drive system featuring pulleys driven by rubber bands, where the drive mechanism is positioned below the spear, allowing for multiple power bands to be situated underneath the stock, thus maintaining a clear view and providing mechanical advantage without obstructing the shooter's line of sight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drive mechanism is positioned above the spear in conventional spearguns, then the structure is simpler, but the line of sight is obstructed and the device becomes larger and more unwieldy
Solution Approach 1:
The drive mechanism is relocated from a vertical arrangement (above the spear) to a horizontal arrangement (below the spear), utilizing the unused space in the longitudinal dimension. This dimensional repositioning allows multiple rubber bands to be arranged side-by-side underneath the stock without interfering with the shooter's upward line of sight to the target.
2Force
If multiple rubber bands are used to increase power, then the propulsive force increases, but the device size increases and becomes unwieldy
Solution Approach 1:
Multiple rubber bands are nested within the compact space beneath the speargun stock, with each band arranged in sequence or parallel within the same longitudinal envelope. This nesting allows the accumulation of propulsive force from multiple bands without proportionally increasing the overall device length or width.
Solution Approach 2:
Instead of extending the device lengthwise to accommodate multiple rubber bands, the invention arranges them in the transverse dimension underneath the stock. This allows multiple power bands to be packed into a compact footprint without increasing the device's unwieldy dimensions.
3Ease of operation
If the drive mechanism is positioned above the spear, then loading is straightforward, but maneuverability and aiming are compromised
Solution Approach 1:
The drive mechanism is repositioned from the vertical dimension (above the spear where it interferes with aiming) to the horizontal dimension (below the spear where it does not obstruct the line of sight). This allows the spear to be held horizontally or at an angle for aiming while the drive mechanism remains accessible for loading from the side or below.
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 speargun achieves a compact, powerful, and easy-to-use design that allows for effective propulsion of the spear with enhanced visibility, enabling efficient loading, aiming, and maneuverability.
Implementation Method 1
rubber bands to provide mechanical advantage and the force of a large speargun
Implementation Method 2
drive system with one or more pulleys driven by one or more rubber bands to provide mechanical advantage
Data Source
AI summary
A sportfishing speargun is sized for ease of use and provides the power of the largest rubber band speargun. The speargun includes a drive system with a first side drive component and a second side drive component, the drive system is driven by one or more power bands to provide mechanical advantage and the force of a large speargun in a compact device.