Retrograde Chronograph Display Reset Mechanism

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Solution Overview

Problem

Conventional timepieces with chronograph display devices do not ensure that the retrograde hand returns to zero after resetting, leading to user uncertainty about the chronograph's operation.

Innovation Solution

A display device that moves the indicating member to a predefined 'zero' position during reset and a different position when the counting wheel is started, providing visual confirmation of the chronograph's operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the retrograde hand is designed to indicate fifths-of-a-second with a neutral zone, then measurement precision is improved, but reliability deteriorates because the hand does not return to zero after resetting

Engineering Contradiction:

Improvefifths-of-a-second indicationVSAvoidchronograph operation confirmation

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The dial is divided into a functional measurement zone and a neutral zone. The retrograde hand operates in the functional zone during chronograph operation and returns to a distinct position in the neutral zone during reset, creating visual segmentation that resolves the contradiction between precise measurement indication and reliable operation confirmation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses visual positioning of the retrograde hand in different zones (functional vs neutral) to provide clear visual feedback. The hand's position in the neutral zone versus the functional zone acts as a visual indicator, similar to color changes, to communicate the chronograph's operational state to the user

Inventive Principle:

Principle #32Color changes

2Device complexity

If the retrograde hand remains in a neutral zone during reset, then device complexity is reduced, but loss of information increases because users cannot confirm proper reset operation

Engineering Contradiction:

Improvedisplay mechanismVSAvoidreset confirmation

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The retrograde hand's position serves as visual feedback to the user. When the chronograph is reset, the hand moves to a specific position in the neutral zone that provides immediate visual confirmation that the reset operation was successful, eliminating information loss without adding complex feedback mechanisms

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11841688B2Display device for a timepiece and timepiece comprising such a device

Publication Date: 2023.12.12 PATEK PHILIPPE SA

AI summary

The display device is arranged in a timepiece which includes a counting wheel and a manual control mechanism which is arranged to permit cyclical starting, stopping and resetting of the counting wheel. The display device includes an indicating member, a unit for moving the indicating member into a first predefined position when the counting wheel is being reset, a unit for moving the indicating member into a second predefined position, different from the first predefined position, when the counting wheel is being started, and a unit for permitting the indicating member to be moved into a reading position following stopping of the counting wheel, the reading position being determined by the position of the counting wheel.