Mechanical Alarm Clock AM/PM Indicator Mechanism
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Solution Overview
Problem
Existing mechanical alarm clocks struggle to set and display alarm times accurately and precisely up to twenty-four hours in advance, often leading to confusion and handling errors due to unconventional dial divisions or unclear indicators.
Innovation Solution
A mechanical alarm clock design featuring a traditional twelve-hour display with separate dials for current and alarm times, utilizing a minute and hour hand for precise setting, and an AM/PM indicator mechanism that is static and energy-efficient, eliminating the need for additional mechanical energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a twenty-four hour dial division is used to indicate alarm time, then the alarm can be set up to twenty-four hours in advance, but the dial becomes unusual and confusing leading to handling errors
Solution Approach 1:
The alarm setting function is segmented into two independent components: a traditional twelve-hour dial for time selection and a separate AM/PM indicator for period identification. This segmentation allows users to set alarms up to twenty-four hours in advance while maintaining familiar dial markings, thereby preventing reading errors and improving ease of operation.
2Loss of time
If a single hand with a twenty-four hour scale is used, then the alarm time can be indicated, but precise setting becomes difficult due to the large number of divisions
Solution Approach 1:
The time-setting mechanism is divided into two hands: an hour hand and a minute hand, both operating on a familiar twelve-hour dial. This segmentation allows precise setting of alarm times by independently adjusting hours and minutes, avoiding the precision problems associated with a single hand on a twenty-four hour scale.
Solution Approach 2:
The twenty-four hour alarm setting capability is achieved by adding a temporal dimension through the AM/PM indicator rather than expanding the dial scale. This allows precise two-dimensional time selection (hour and minute) on a familiar twelve-hour face while still providing full twenty-four hour range through the added AM/PM dimension.
3Loss of information
If AM/PM indicator is added to display present time, then twenty-four hour time can be distinguished, but energy consumption increases
Solution Approach 1:
The AM/PM indicator is designed as a static display element that automatically reflects the current period without requiring additional mechanical driving force. The indicator lever is positioned to be visible through the dial and changes state based on the existing movement's position, allowing the mechanism to serve itself without consuming additional energy.
Solution Approach 2:
The AM/PM indicator serves dual functions: it provides twenty-four hour time distinction for alarm setting and simultaneously indicates the current period for present time reference. This multi-functionality eliminates the need for separate indicators, reducing overall energy consumption while maintaining full information display.
Data Source
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AI summary
The watch has a mechanical movement driving an hour display unit that is provided with hour and minute hands surmounted on a dial. A triggering mechanism manually triggers an alarm at a predetermined alarm time on every twenty four hours. An alarm time display mechanism has another hour hand for displaying an alarm time over twelve hours. An ante meridiem (AM)/post meridiem (PM) hand (52) is carried by a lever (48) for indicating whether the alarm time is situated between midnight and noon or between noon and midnight.