Pulley Speargun Layout for Compact Length and Full Arming Distance
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Solution Overview
Problem
Spearfishing devices face challenges such as elongated barrels affecting trajectory and accuracy, cumbersome design, and difficulty in maneuverability due to size and weight, with complex attachments compromising usability and ease of use underwater.
Innovation Solution
A handheld spearfishing device with a pulley system integrated into the barrel, reducing the effective length by half during propulsion, featuring an ergonomic design and lightweight construction, allowing for enhanced maneuverability and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the barrel is elongated to increase arming distance, then spear propulsion effectiveness is improved, but device length and maneuverability deteriorate
Solution Approach 1:
The pulley system is nested within the barrel structure, allowing the elastic band to wrap around the pulley and effectively double the arming distance within the same physical barrel length. This nesting approach resolves the contradiction by providing extended propulsion capability without increasing the external dimensions of the device.
Solution Approach 2:
The invention introduces a dimensional transformation by wrapping the elastic band around a pulley, converting linear arming distance into a rotational path. This allows the band to traverse a longer path (improving propulsion) while the pulley itself occupies minimal linear space (maintaining compact device length).
2Adaptability or versatility
If multiple attachments are added to enhance functionality, then versatility is improved, but device complexity and weight increase
Solution Approach 1:
The pulley system serves multiple functions: it extends arming distance, maintains compact size, and provides a mechanical advantage for band tensioning. By making this single component multi-functional, the invention avoids adding separate attachments, thereby maintaining structural simplicity while enhancing versatility.
Solution Approach 2:
The invention merges the functions of arming mechanism, propulsion system, and length-reduction feature into a single integrated pulley system within the barrel. This consolidation eliminates the need for separate attachments, reducing overall device complexity while maintaining enhanced functionality.
3Ease of operation
If the device size is reduced for better maneuverability, then ease of operation is improved, but arming distance and propulsion effectiveness deteriorate
Solution Approach 1:
The pulley system is nested within the compact barrel, allowing the elastic band to achieve an extended effective length through rotational wrapping. This enables the device to maintain a compact external size (improving maneuverability) while providing sufficient arming distance (maintaining propulsion effectiveness).
Solution Approach 2:
By transforming the linear arming motion into a rotational path around the pulley, the invention allows the elastic band to accumulate sufficient length for effective propulsion within a compact device footprint, thus resolving the contradiction between size and power.
4Force
If the elastic band is stretched for propulsion, then spear launch force is improved, but effective device length is reduced
Solution Approach 1:
The pulley system transforms the linear stretching of the elastic band into a rotational motion, allowing the band to achieve greater effective length through wrapping around the pulley. This enables high launch force to be generated while the physical extension of the device remains compact.
Solution Approach 2:
The pulley system pre-configures the elastic band in a wrapped state, storing potential energy in a compact form. When released, the unwrapping action provides the launch force, effectively converting the band's elastic energy into spear propulsion without requiring extensive linear extension of the device.
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 pulley system enhances the device's maneuverability and usability underwater by maintaining optimal performance and balance, while reducing the overall size and weight, ensuring efficient spear propulsion and ease of handling.
Implementation Method 1
an elastic band configured to propel a spear
Implementation Method 2
a pulley mounted within the housing; wherein the elastic band is wrapped around the pulley and configured to rotate about an axis perpendicular to the firing chamber axis of the housing wherein tension is exerted on the elastic band is configured to reduce the effective length of the housing by half when the elastic band is stretched for propulsion
Data Source
AI summary
A handheld spearfishing device designed with a pulley system configured to reduce the effective length of the device without compromising the arming distance needed to expel a spear. The housing, comprising front and rear surfaces, lateral side walls, a top wall, and a bottom wall, defines a firing chamber axis and a barrel alongside two band conduits n a parallel direction. This configuration allows for streamlined functionality and efficient deployment of a spear underwater.