Chronograph Watch Countdown Display Mechanism
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Solution Overview
Problem
Existing chronograph watches lack a simple and legible way to display both upward and downward time intervals, particularly in regatta applications, with complex mechanisms and poor readability during countdown phases.
Innovation Solution
A chronograph watch design where the chronograph minute hand can be driven clockwise in both chronograph and countdown modes, with a countdown minute disc connected via its own gear train, allowing seamless switching and improved readability through a differential gear mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate countdown minute hand is used to display countdown time, then the countdown function is achieved, but the mechanism complexity increases due to series-connected clutches
Solution Approach 1:
The chronograph minute hand is designed to perform dual functions: displaying both chronograph time (when driven clockwise) and countdown time (when driven counterclockwise). This eliminates the need for a separate countdown minute hand and the complex series-connected clutch mechanism, while maintaining full countdown functionality
Solution Approach 2:
The patent merges the chronograph minute hand and countdown minute hand into a single hand that can rotate in both directions. The parallel-connected clutch mechanism allows both the chronograph and countdown functions to drive the same hand simultaneously or independently, simplifying the overall mechanism
2Loss of information
If the chronograph minute hand rotates counterclockwise for countdown mode, then the mode distinction is clear, but smooth transition between modes becomes difficult
Solution Approach 1:
The patent implements a dynamic system where the minute hand can rotate in both clockwise and counterclockwise directions depending on the active mode. The parallel clutch mechanism allows smooth transitions between modes by engaging or disengaging drive paths without requiring the hand to reverse direction abruptly, combining mode clarity with operational smoothness
3Loss of information
If the chronograph minute hand rotates in opposite directions for chronograph and countdown modes, then mode identification is improved, but the mechanism complexity increases
Solution Approach 1:
A single chronograph minute hand serves both chronograph and countdown functions by rotating in different directions. The parallel clutch mechanism enables this multi-functionality by allowing independent engagement of clockwise drive (chronograph) and counterclockwise drive (countdown), achieving mode identification without requiring separate hands or complex switching mechanisms
Data Source
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AI summary
The watch has a chronograph display unit (1) with a chronograph second needle (1.1) and a chronograph minute needle (1.2). The display unit is attachably and detachably connected with an energy source and a regulating unit of a chronograph mechanism by wheel works. The chronograph minute needle is operated in clockwise direction in a chronograph mode and countdown mode. An initial position of the minute needle is adjusted in counterclockwise direction in the countdown mode. A drive of the minute needle changes from the countdown mode into the chronograph mode.