Watch Trigger Mechanism for Precision Chronograph Actuation
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Solution Overview
Problem
Existing chronograph watches lack precision in timing due to manual actuation of pushbuttons, which is affected by finger cushioning and gloved hands, and existing solutions are either cumbersome or lack mechanical linkage for improved precision.
Innovation Solution
A trigger mechanism with a striker member and mechanical linkage that remotely actuates the pushbutton through a pivotal lever, transforming its movement into reciprocal motion for precise operation of chronograph functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual pushbutton actuation is used, then the chronograph functions can be operated, but timing precision deteriorates due to finger cushioning and gloved hands
Solution Approach 1:
A trigger mechanism with a lever and striker member is introduced as an intermediary between the user's finger and the pushbutton. The lever pivots on the watchcase and transforms finger movement into precise reciprocal motion of the striker member that remotely actuates the pushbutton, eliminating the cushioning effect of flesh and gloves while maintaining ease of operation
Solution Approach 2:
The actuation system is segmented into distinct functional components: the lever for movement transformation, the striker member for remote actuation, and the pushbutton for switch activation. This segmentation allows each component to be optimized for its specific function, with the striker member providing precise mechanical force application independent of finger manipulation variations
2Measurement precision
If a trigger mechanism with mechanical linkage is implemented, then actuation precision is improved, but device complexity increases
Solution Approach 1:
The lever serves multiple functions: it acts as a movement transformer converting finger motion into reciprocal striker motion, serves as a mechanical amplifier for precision control, and provides structural support for the trigger mechanism. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving improved actuation precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The trigger mechanism provides improved precision in actuating chronograph functions by generating mechanical force selectively on the pushbutton, allowing for precise operation regardless of finger manipulation or gloved hands.
Implementation Method 1
mechanical linkage for transforming said pivotal movement of the lever to reciprocal movement of the striker member between a rest position and a stroke position
Data Source
AI summary
A trigger mechanism for remotely operating the chronograph functions of a watch. A lever mounted to the watchcase is swingable about a pivotal connection for rotating a cylindrical cam. A rotary cam follower is displaced by the cam. A striker member extending from the cam follower actuates a pushbutton for controlling the chronograph functions.