Watch Case Internal Indexing for Winding Crown Alignment
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Solution Overview
Problem
Existing watch case designs with elongated winding crowns face issues with correct indexing and protection from shocks, as visible indexing devices or lack of angular position fixing hinder both aesthetic appeal and functional reliability.
Innovation Solution
A watch case with a winding crown featuring a perpendicularly extending axis and an indexing device comprising longitudinal grooves on the axis and elastic stops within the case, allowing precise alignment and secure positioning without visible components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a ball stopper indexing device is used to hold the winding crown in rest position, then correct indexing and positioning are achieved, but the indexing device becomes visible when the crown is in pulled-out time-setting position
Solution Approach 1:
The patent extracts the indexing function from a visible external indexing device and relocates it to an internal cam profile integrated into the case structure. The cam profile is formed within the case body, making the indexing mechanism invisible from the outside while maintaining precise angular positioning of the winding crown in rest and setting positions.
Solution Approach 2:
The patent merges the indexing function with the case structure itself by integrating the cam profile directly into the case body. This combination eliminates the need for separate visible indexing components while maintaining precise positioning functionality through the cam's geometric profile that interacts with the winding crown stem.
2Device complexity
If an indexing device is mounted inside the case to prevent visibility, then aesthetic appearance is improved, but the device must be more complex to achieve the same indexing function
Solution Approach 1:
The patent merges the indexing function with the case structure itself by integrating the cam profile directly into the case body. This combination eliminates the need for separate visible indexing components while maintaining precise positioning functionality through the cam's geometric profile that interacts with the winding crown stem.
Solution Approach 2:
The patent changes the form and location of the indexing mechanism from an external adjustable device to an internal fixed geometric profile. The cam profile's shape and position are designed during case manufacturing, transforming the indexing function from a mechanical assembly into an integrated structural feature that is simpler to produce in mass manufacturing.
3Shape
If the winding crown head is elongated for aesthetic purposes, then aesthetic appeal is improved, but correct indexing and protection from shocks become more difficult
Solution Approach 1:
The patent employs asymmetric cam profile geometry that corresponds to the elongated shape of the winding crown head. The cam profile is designed with specific asymmetric contours that engage with the crown stem to provide precise indexing at rest and setting positions, accommodating and enhancing the aesthetic elongated form rather than conflicting with it.
Solution Approach 2:
The patent changes the form and location of the indexing mechanism from an external adjustable device to an internal fixed geometric profile. The cam profile's shape and position are designed during case manufacturing, transforming the indexing function from a mechanical assembly into an integrated structural feature that is simpler to produce in mass manufacturing.
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
Ensures correct alignment and secure positioning of the winding crown, preventing damage from shocks and facilitating smooth operation across different functions like winding, date setting, and time setting, while maintaining a clean exterior.
Implementation Method 1
at least one indexing element in the form of an elastic stop (11, 11') having a body (11, 11') fixed in the box (B) and containing a spring (12) acting on a piston (13, 13') or a ball (14, 14')
Data Source
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AI summary
The invention relates to a watch case provided with a rotary, axially movable control member comprising a head which can be accessed from outside the case, connected to a stem element mounted radially inside the case. Said case includes a device for indexing the control member located entirely inside the case. Said indexing device is operative or inoperative depending on the axial position of the control member.