Watchcase Capsule Locking for Child-Safe Battery Access

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Solution Overview

Problem

Existing watchcases with quick-release rotational coupling systems pose a risk of unauthorized access, particularly by young children, who can remove the cell cover and access the battery compartment, leading to potential swallowing hazards.

Innovation Solution

A watchcase design featuring a water-resistant capsule and middle assembled with a bayonet connector, secured by a bolt to prevent relative rotation, ensuring secure access to the electrical energy source while allowing easy assembly and disassembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If quick-release rotational coupling means are used to enable easy cell replacement, then ease of operation is improved, but security against unauthorized access deteriorates

Engineering Contradiction:

Improveease of cell replacementVSAvoidunauthorized access by children

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The watchcase is divided into separate functional modules: a secure capsule containing the cell and movement, and a middle section with coupling means. The capsule can be detached as a complete unit, separating the secure storage function from the easy access function. This allows the capsule to remain secure while the coupling mechanism provides easy replacement capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The capsule is nested within the watchcase structure, with the capsule containing both the cell and movement as nested components. The capsule itself acts as a secure container that must be detached as a whole unit, preventing direct access to the cell while maintaining the overall compact structure of the watchcase.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the back is indexed to the container to prevent relative rotation, then reliability of sensor connections is improved, but device complexity increases

Engineering Contradiction:

Improvesensor connection reliabilityVSAvoidcapsule assembly complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The indexing feature creates an asymmetric relationship between the back and container, where specific features on the back align with corresponding features on the container. This asymmetric indexing prevents relative rotation without requiring complex locking mechanisms, as the asymmetric features naturally guide proper alignment during assembly.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The indexing between the back and container is established during the assembly process itself, preliminarily determining the correct orientation before final securing. This preliminary alignment action ensures that sensors are correctly positioned and connected to the movement without requiring additional complex adjustment or alignment mechanisms later.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260072411A1Watchcase with capsule

Publication Date: 2026.03.12 ETA SA MFG HORLOGERE SUISSE

AI summary

A watchcase (1) including a middle (3), a capsule (2) assembled with a bayonet connector in the middle (3) and a bolt (16) fitted on the bayonet connector to lock any relative rotation between the capsule (2) and the middle (3), the capsule (2) including: a container (4) for holding a movement and a detachable source of electrical energy; a back (6) and a glass (8) respectively closing the container (4) with the back (6) indexed to the container (4) to prevent any relative rotational movement between the back (6) and the container (4) ; and a water-resistant joint (5) between the container (4) and the back (6).