Watch Band Spring Bar Fixation Without Bending
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Solution Overview
Problem
Existing band and watch coupling systems require bending of metal components to prevent spring bar disengagement, which is difficult to achieve when using pure metal materials.
Innovation Solution
A band design incorporating a spring bar with a shaft member, operation portion, and protruding members, along with an outer piece and middle piece configuration that allows the spring bar to be inserted through specific recessed and insertion holes, enabling movement of the operation portion to prevent disengagement without bending, and utilizing a C-ring and pin for fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring bar attachment structure with bending components is used to prevent disengagement, then the spring bar is securely fixed to the band, but it becomes difficult to manufacture using pure metal materials
Solution Approach 1:
The outer piece is divided into multiple segments (first outer piece component, second outer piece component, and middle piece) that can be assembled together. This segmentation allows the spring bar to be fixed through the insertion holes and recessed portions of each segment without requiring bending of any single component, enabling manufacturing with pure metal materials while maintaining secure fixation.
Solution Approach 2:
The middle piece acts as an intermediary component between the first and second outer piece components. It provides the second insertion hole and second recessed portion that enable the spring bar to be fixed in place without bending, serving as a mediator that resolves the conflict between secure fixation and ease of manufacture with pure metal.
2Ease of manufacture
If the operation portion moves in the axial direction, then disengagement prevention is achieved without bending components, but the structure becomes more complex with multiple insertion holes and recessed portions
Solution Approach 1:
The outer piece components and middle piece serve multiple functions: they provide structural support for the band, create insertion paths for the spring bar through their insertion holes, and provide retention through their recessed portions. This multi-functionality reduces the need for additional separate components, thereby managing complexity while achieving disengagement prevention without bending.
Solution Approach 2:
The middle piece is nested between the first and second outer piece components, with its insertion holes and recessed portions aligned with those of the outer pieces. This nested arrangement creates a coordinated system where the spring bar passes through multiple levels of components, achieving secure fixation without bending while organizing the complexity in a structured manner.
Data Source
AI summary
A band of the present disclosure includes: a spring bar including a shaft member and an operation portion; an outer piece including a first arm portion and a second arm portion; and a middle piece disposed between the first arm portion and the second arm portion. The first arm portion includes a first recessed portion provided along an axial direction of the shaft member, the second arm portion includes a first insertion hole provided along the axial direction, and the middle piece includes a second insertion hole provided along the axial direction, and a second recessed portion provided along the axial direction and in communication with the second insertion hole. The spring bar is inserted through the first recessed portion, the second insertion hole, the second recessed portion, and the first insertion hole. The operation portion is disposed protruding from an opening of the second recessed portion.