Fishing Reel Control Case Recess-Projection Alignment
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Solution Overview
Problem
Conventional fishing electric reels with control cases face issues due to low concentricity accuracy between through holes in the upper case and cover member, leading to frictional resistance problems that affect the switch operating part's functionality, especially when dirt adheres, causing reliability and stability issues.
Innovation Solution
A control case with a recess-projection fitting portion aligns the through holes in the upper case and cover member concentrically, ensuring accurate positioning and minimizing frictional resistance, thereby stabilizing switch operation and reducing failure risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If through holes in the upper case and cover member are formed with a slight gap around the switch operating part, then the switch operating part can be inserted and operated, but the concentricity accuracy between the through holes becomes low, causing frictional resistance that affects switch functionality
Solution Approach 1:
The recess-projection fitting portions are provided on the upper case and cover member to preliminarily align the through holes in a concentric manner before the switch operating part is inserted. This preliminary alignment ensures that the through holes maintain concentricity during assembly and operation, preventing frictional resistance issues while allowing easy switch operation.
2Ease of manufacture
If the through holes are formed with poor concentricity alignment, then assembly is easier, but the switch operating part experiences frictional resistance that causes functional troubles and reliability issues
Solution Approach 1:
The recess-projection fitting portions are designed to preliminarily position and align the through holes concentrically during the assembly process. This preliminary alignment action ensures that subsequent insertion of the switch operating part occurs with proper concentricity, maintaining reliability while preserving ease of assembly through the self-aligning feature.
Solution Approach 2:
The recess-projection fitting portions act as intermediary elements between the upper case and cover member, mediating the alignment process. These fitting portions guide the relative positioning of the two components to achieve concentric alignment of the through holes, thereby ensuring switch reliability without complicating the assembly process.
3Reliability
If dirt and foreign matters adhere to the switch operating part, then the frictional resistance increases due to misalignment, but the recess-projection fitting portion maintains concentricity to reduce this effect
Solution Approach 1:
The recess-projection fitting portions establish concentric alignment of the through holes before the switch operating part is fully inserted and before dirt can accumulate. This preliminary positioning minimizes the initial frictional resistance and maintains stable switch operation even when dirt adheres during use, as the structural alignment prevents excessive misalignment friction.
Data Source
AI summary
A control case for a fishing electric reel comprises: an electrical component; a case body comprising a lower case and an upper case that has one or a plurality of second through holes; a cover member having one or a plurality of first through holes; one or a plurality of switch operating parts; and a recess-projection fitting portion. The case body is arranged on an upper portion of a reel body. The cover member is mounted on an upper side of the upper case. The one or the plurality of switch operating parts are capable of being inserted into the one or the plurality of first through holes and the one or the plurality of second through holes. The recess-projection fitting portion is configured to align a positioning of the cover member and the upper case in order to ensure concentricity between the first through hole and the second through hole.