Interchangeable Wristwatch Strap with C-Shaped Guiding System
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Solution Overview
Problem
Traditional wristwatches require professional intervention and tools to change straps, posing safety risks and aesthetic concerns due to protruding mechanisms, and existing interchangeable systems are either unsafe or unsightly.
Innovation Solution
A wristwatch design featuring removably connected lugs with a C-shaped guiding system and rotating case back with hooks, allowing strap replacement without tools, ensuring safety and a sleek appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal pins or screws are used to secure the strap to the lugs, then the strap connection is strong and reliable, but the strap cannot be changed by users without professional tools and there is a risk of damaging the case
Solution Approach 1:
The strap system is divided into modular components: the strap itself, the lugs with spring bars, and the release mechanism. The lugs are separable from the case, allowing the strap to be removed by detaching the lugs rather than requiring tool-based fastener removal. This segmentation enables user-friendly strap replacement while maintaining secure connection during wear.
Solution Approach 2:
Spring bars serve as intermediary elements between the lugs and the strap. These spring bars can be independently manipulated through release mechanisms to detach the lugs from the case, providing a safe intermediate step that protects the case while enabling strap replacement. The spring bars absorb the mechanical stress of attachment and detachment.
2Ease of operation
If a hinged cover with a button is used to protect the strap fitting, then the strap can be easily changed by users, but the strap can be easily detached when not worn and the button protrudes from the case
Solution Approach 1:
The release mechanism is extracted from the case body and integrated into the lugs themselves. The lugs contain the spring bar release mechanism, eliminating the need for external buttons or covers on the case. This extraction maintains ease of operation while improving stability, as the release mechanism is protected within the lug structure rather than protruding from the case.
Solution Approach 2:
The release mechanism is nested within the lug structure, which itself is attached to the case. The spring bars are nested within the lug assembly, and the release elements are contained within the lug body. This nested arrangement protects the release mechanism while maintaining compact case appearance and secure strap attachment.
3Reliability
If professional tools and intervention are required to change the strap, then the case and strap are protected from damage, but the process involves time and costs
Solution Approach 1:
The wristwatch system is designed to be self-servicing for strap replacement. The lugs with integrated spring bar release mechanisms allow users to detach and attach lugs without external tools. The design incorporates user-friendly release elements that can be operated with fingernails or simple pressure, enabling self-service strap changes while maintaining protection of case and strap components.
Data Source
AI summary
The present invention concerns a wristwatch comprising a case and a strap that are provided with a system for easily and rapidly disengaging the strap from the case and replacing it by another strap. The present invention also relates to a kit of parts comprising this wristwatch and one or more replacement straps.