Watch Crown Pulling Lever Mechanism for Protected Access
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Solution Overview
Problem
Existing crown protection devices for watches require uncomfortable and laborious operation to pull out the crown due to the user gripping the larger thread instead of the crown itself, making it difficult to access and use the crown for setting time or other functions.
Innovation Solution
A crown-covering device with a lever mechanism that allows the crown to be pulled out without direct contact, featuring a cap that screws onto a thread under the crown for protection, and a lever with a ball spring to facilitate easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap screws onto a thread with larger diameter than the crown, then the crown is protected and covered, but the user cannot grip the crown directly to pull it out
Solution Approach 1:
A lever is introduced as an intermediary tool between the user's fingers and the crown. The lever has a first end for user operation and a second end that engages with the crown's shaft, allowing the user to pull the crown out without directly gripping it or the thread structure.
2Reliability
If the thread diameter is larger than the crown diameter, then the cap can securely cover the crown, but the user's fingers automatically grip the thread instead of the crown
Solution Approach 1:
The lever acts as a mediator that transfers the user's pulling force to the crown shaft without requiring direct finger contact with the crown or thread. The first end 18a of the lever is operated by the user, while the second end 18b engages with the housing under the crown to push it upwards.
Solution Approach 2:
The device is segmented into distinct functional components: the cap for protection, the lever for operation, and the spring for return force. This segmentation allows each component to perform its specific function independently, with the lever providing a dedicated interface for crown manipulation separate from the protective cap structure.
3Reliability
If the crown is covered by a cap, then the crown is protected from damage and water, but the user must remove the cap to access the crown
Solution Approach 1:
The lever serves multiple functions: it acts as a tool to pull the crown out, and when the crown is pushed in, the lever automatically returns to its initial position thanks to the ball spring 23. This multi-functionality reduces the number of separate components needed and simplifies the overall operation.
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
Enables intuitive and simple operation to pull out and push back the crown, ensuring protection while allowing easy access for user interactions, improving user experience and convenience.
Implementation Method 1
a ball spring 23 adapted to act on said first end 18a of said lever 18 is then inserted into the cavity 19 of the case so as to keep the lever in the inactive position
Data Source
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AI summary
A device is described for protecting the crown of a watch comprising a slider capable of sliding, covering and compressing the watch crown against the case.