Propeller Body Rotation Restriction for Casting Distance
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Solution Overview
Problem
Conventional fish collecting devices with propellers face issues such as free rotation during casting, which reduces casting distance, and structural complexity or high manufacturing costs, as well as the risk of adapter breakage and entanglement with floating objects.
Innovation Solution
A fish collecting device with a propeller body featuring rotary wings, a front end stopper, and a rear end stopper, supported by a rotary shaft with a rotation restricting portion, allowing for controlled rotation during casting and free rotation in water, using either a metal plate or resin mold construction to prevent free rotation with respect to the rotary shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the propeller is allowed to rotate freely during casting, then the propeller can maintain its direction in water, but the casting distance is reduced due to large air resistance
Solution Approach 1:
The propeller body is designed to dynamically change its rotational state between casting and fishing modes. During casting, the propeller body rotates relative to the rotary shaft to reduce air resistance. During fishing, the propeller body maintains a fixed position relative to the rotary shaft to produce sonic and visual stimuli. This dynamic adaptation resolves the contradiction between casting distance and direction maintenance.
2Speed
If a hemispheric adapter is provided to prevent free rotation of the propeller, then casting distance is improved, but the adapter is vulnerable to breakage from impact when the lure enters water
Solution Approach 1:
The invention extracts the rotation prevention function from a separate adapter component and integrates it directly into the propeller body structure. The propeller body itself serves as the rotation preventing member, eliminating the need for a separate hemispheric adapter that was vulnerable to breakage. This integration maintains casting distance improvement while enhancing reliability.
3Ease of operation
If the propeller body has a complex structure to prevent free rotation, then rotation control is achieved, but manufacturing costs and fabrication labor increase
Solution Approach 1:
The invention merges the rotation preventing function with the propeller body structure itself. The propeller body includes a rotation preventing portion that directly engages with the rotary shaft, combining multiple functions (propulsion and rotation control) into a single integrated component. This reduces the number of separate parts, simplifies manufacturing, and lowers fabrication labor while maintaining effective rotation control.
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 enables a larger casting distance while maintaining directionality and reducing air resistance, with a simpler structure that minimizes manufacturing costs and avoids adapter breakage and entanglement issues.
Implementation Method 1
The propeller rotating in the water produces a special sonic or visual stimulus that lures curious fishes
Implementation Method 2
the rotary shaft including a rotation restricting portion for contacting the propeller body, wherein the propeller body and the rotary shaft relatively move between a first arrangement in which the propeller body freely rotates with respect to the rotary shaft and a second arrangement in which the rotation restricting portion contacts the propeller body
Data Source
AI summary
One object is to provide a fish collecting device having a simple structure whereby free rotation of a propeller is prevented in casting, and the propeller can rotate freely under water. The propeller body is formed of one metal plate or an integral resin mold; a front end stopper and a rear end stopper are formed of bent or projected parts of the propeller body at the front end and rear end of the propeller body, and a rotary shaft, inserted through holes formed in the front end stopper and the rear end stopper, has a rotation restricting portion for contacting the propeller body. Free rotation of the propeller body in casting can be restricted by a simple structure wherein the rotation restricting portion contacts the propeller body and the rotary shaft engages with the propeller body such that the propeller body is unrotatable with respect to the rotary shaft.