Fishing Reel Handle Return Position Adjustment Mechanism

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Solution Overview

Problem

Conventional fishing reels require laborious adjustments to change the handle return position, necessitating disassembly and rearrangement of components, which is inconvenient for users seeking a preferred rotation angle.

Innovation Solution

A handle return position adjustment mechanism featuring a position adjustment member with multiple engagement portions arranged circumferentially around the handle shaft, allowing users to select and attach the handle at desired rotation angles without disassembling the reel, using polygonal or concave/convex configurations for easy adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the handle is fixed to the handle shaft at a predetermined position, then the clutch return mechanism operates reliably, but the user cannot adjust the handle return position to a preferred rotation angle

Engineering Contradiction:

Improvehandle return position adjustabilityVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The handle shaft is divided into multiple circumferential positions with engagement portions at different rotation angles. The handle can be selectively attached at different segments (engagement portions) to achieve different return positions, transforming a fixed structure into a segmented adjustable one.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The handle attachment position is made changeable/dynamic by providing multiple engagement portions around the handle shaft circumference. Users can reposition the handle between different engagement portions to adjust the return position according to their preferences.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If the ratchet wheel is supported coaxially and non-rotatably to the handle shaft, then the handle return position is determined at a predetermined rotation angle, but laborious adjustment work is required to change the return position

Engineering Contradiction:

Improveease of handle return position adjustmentVSAvoidadjustment time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

Multiple engagement portions are provided at different circumferential positions on the handle shaft. Users can directly select and attach the handle at different segments to change the return position, eliminating the need for disassembly and rearrangement of components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system allows users to independently adjust the handle return position by simply attaching the handle at different engagement portions without requiring disassembly of the reel or complex adjustment procedures.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If multiple engagement portions are provided on the handle shaft, then the handle return position can be easily adjusted without disassembly, but the device structure becomes more complex

Engineering Contradiction:

Improvehandle return position adjustabilityVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The handle shaft is segmented with multiple engagement portions at different circumferential positions. This segmentation allows the handle to be attached at different locations to achieve different return positions while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The handle shaft serves multiple functions: it supports the handle, provides rotational movement, and offers multiple engagement portions for position adjustment. This multi-functionality reduces the need for additional separate adjustment mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10798926B2Handle return position adjustment mechanism for a fishing reel

Publication Date: 2020.10.13 SHIMANO INC

AI summary

A handle return position adjustment mechanism for a fishing reel including a handle disposed on the fishing reel and supported by a handle shaft is disclosed. The handle return position adjustment mechanism includes a position adjustment member detachably and non-rotatably fitted to the handle shaft and having a first rotation engagement portion, and a second rotation engagement portion disposed on the handle to be engageable with the first rotation engagement portion. At least one of the first rotation engagement portion and the second rotation engagement portion includes a plurality of portions which are arranged at intervals in a circumferential direction circling around the handle shaft. The second rotation engagement portion is selectively engaged in a relative position in the circumferential direction with respect to the first rotation engagement portion.