Coaxial Crown Control Device for Timepiece Functions
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Solution Overview
Problem
Existing watchmaking solutions require multiple control means around the watch case to control additional functions, which can be aesthetically and technically unsatisfactory, and previous coaxial control systems either lack functionality or complicate the operation of additional functions.
Innovation Solution
A control device featuring a secondary crown coaxially arranged with the main crown, capable of independent rotation and traction, with a kinematic link that includes clutch means and a movable element to control additional timepiece functions without the need for additional control devices at different locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional control means are placed at different positions around the watch case to control additional functions, then the functionality of the timepiece is improved, but the aesthetics and design unity are worsened
Solution Approach 1:
The patent merges multiple control functions into a single coaxial location by providing a main crown and a secondary crown that share the same central position on the watch case. This consolidation allows multiple functions to be controlled from one location rather than distributing control elements across different positions, thereby maintaining design unity and aesthetics while preserving full functionality.
Solution Approach 2:
The secondary crown is designed to control additional functions (such as chronograph, date, or other complications) while sharing the same spatial location as the main crown. This multi-functionality at a single location allows the timepiece to offer extended capabilities without compromising the aesthetic design by adding separate control elements at different positions around the case.
2Shape
If a secondary crown is arranged coaxially with the main crown to control additional functions, then the aesthetics and design freedom are improved, but the operation complexity increases
Solution Approach 1:
The control system is segmented into distinct functional zones within the coaxial arrangement. The main crown handles primary functions (winding, time setting) while the secondary crown handles additional functions. This segmentation of functions between two separate control elements at the same location allows each crown to be operated independently without interference, reducing operational complexity despite the coaxial configuration.
Solution Approach 2:
The patent employs intermediate mechanical structures such as clutch mechanisms and movable elements that mediate between the secondary crown and the movement functions. These intermediary components enable selective engagement and disengagement of additional functions, allowing the user to access different functions as needed without creating permanent operational conflicts or excessive complexity.
3Ease of operation
If multiple control means are distributed around the watch case, then the control of different functions is simplified, but the device complexity and number of components increase
Solution Approach 1:
The patent combines multiple control functions into a compact coaxial arrangement where the main crown and secondary crown share the same location. This merging of control elements into a single spatial zone reduces the overall number of separate components and assembly points compared to distributing control means around the case, while still providing distinct control for each function through the two-crown system.
Data Source
Figure 1a~1c
Figure 2a~2b
Figure 2c~2d
AI summary
Control device for a timepiece, the device comprising a main crown (1) capable of being actuated by rotation and by pulling, having at least two axial positions, and a secondary crown (2) arranged coaxially with respect to the main crown (1), said main crown (1) comprising a crown head (1.1) and a control rod (1.2) rigidly fixed to the crown head (1.1) and adapted to be engaged or disengaged from a winding stem of a movement of said timepiece to control functions of said timepiece and said secondary crown (2) comprising a crown body.The control device is distinguished in that said secondary crown (2) is capable of being actuated by rotation and by traction, has at least two axial positions, and includes a kinematic linkage capable of controlling at least one additional function of said timepiece, said main crown (1) and secondary crown (2) being actuable independently of each other. The present invention also relates to a timepiece comprising such a control device.