Watch Case Cap Retainer for Tool-Free Personalization

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Solution Overview

Problem

Existing watch designs lack flexibility in personalization and require professional assistance for case cap exchange, limiting user customization and convenience.

Innovation Solution

A removable case cap system with a case cap retainer allows users to exchange case caps without tools, featuring a reciprocal locking mechanism for secure attachment and detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a traditional fixed case cap design is used, then the watch structure is simple and reliable, but the user cannot easily exchange case caps for personalization

Engineering Contradiction:

Improvecase cap exchangeabilityVSAvoidcase cap attachment mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The case cap assembly is divided into separable components: the case cap itself and the case cap retainer. This segmentation allows the case cap to be easily removed and replaced by users while the retainer remains integrated with the case back, providing a simple attachment mechanism that enables customization without complex tools or procedures.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If a removable case cap system is implemented, then user customization is enabled, but the risk of improper attachment and damage increases

Engineering Contradiction:

Improvecase cap removal and attachmentVSAvoidcase cap attachment security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The case cap retainer is designed with a self-aligning mechanism that guides the case cap into proper positioning during attachment. The retainer includes engagement features that automatically secure the case cap when correctly aligned, eliminating the need for complex alignment procedures or specialized tools while ensuring reliable attachment by the end user.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If the case cap is permanently fixed, then the watch movement is well protected, but the user cannot access or customize the case cap

Engineering Contradiction:

Improvepersonalization capabilityVSAvoidcase cap attachment system

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The case cap function is extracted from the permanent case back structure and separated into a removable case cap that interfaces with an integrated case cap retainer. This extraction allows the case cap to be independently manufactured, customized, and replaced while the retainer remains part of the case back assembly, simplifying the overall manufacturing process and enabling personalization options.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12449770B2Case cap retainer for a watch having a case cap

Publication Date: 2025.10.21 HAMPDEN CORP

AI summary

The disclosure provides an example watch. The watch includes (a) a housing having a first face and a second face and a cavity extending therebetween, where the first face includes a first bezel coupled to a first transparent watch crystal, (b) a disc disposed within the cavity between the first face and the second face and coupled to the housing, where the disc comprises a watch face for indicating time, and (c) a case cap removably coupled to the second face of the housing, where the case cap includes a casing having a first side configured to mate with the second face of the housing and a second side configured to be engraved.