Multi-Function Timepiece Crown for Independent Push and Rotation Control
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Solution Overview
Problem
Existing timepiece control mechanisms are complex and aesthetically unappealing due to the multitude of control members required for various functions, leading to construction and tightness issues, and often require multiple control members to independently actuate different functions.
Innovation Solution
A single control member comprising a crown and control stem that integrates both rotational and translational movements to actuate two separate functions, one through axial translation and the other through axial rotation, with a security device to prevent unintended actuation, allowing for independent control of functions like a push-piece and control stem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple control members are used to independently actuate different functions, then each function can be controlled separately, but the construction becomes complex and aesthetics deteriorate
Solution Approach 1:
The patent merges a push-piece and a control stem into a single integrated control member. The crown serves dual functionality: it can be pressed axially to activate one function while simultaneously being rotatable to control another function through the control stem. This consolidation reduces the number of separate control members from multiple to just one, simplifying the overall device structure while maintaining independent control capability for multiple functions.
Solution Approach 2:
The crown is designed as a universal control member that performs multiple functions. It can be actuated in different modes (axial pressing for push-piece function, rotational movement for control stem function) to control different timepiece functions. This multi-functionality eliminates the need for separate dedicated control members for each function, thereby reducing device complexity while preserving operational independence.
2Adaptability or versatility
If multiple control members are distributed around the case middle, then different functions can be accessed, but tightness problems and aesthetic issues arise
Solution Approach 1:
By combining multiple control functions into a single crown assembly, the patent eliminates the need for multiple separate control members distributed around the case middle. This consolidation reduces the number of openings and interfaces in the case structure, thereby improving tightness and reliability while maintaining access to all necessary functions through one centralized control point.
3Adaptability or versatility
If a push-piece crown is used with extension tube, then third function can be actuated, but construction of crown becomes complex and adjustment becomes difficult
Solution Approach 1:
The patent merges the push-piece mechanism and control stem into a single integrated crown assembly, eliminating the need for separate extension tubes and independent control members. The crown itself is designed to perform both axial pressing and rotational movements, consolidating what would otherwise require multiple separate components into one unified structure, thereby simplifying construction while maintaining the ability to actuate multiple functions including the third function.
Data Source
AI summary
A multi-function control member of a timepiece movement includes a crown and rotationally integral control stem that is integral in rotation with a first actuating device of a first function. Under pressure, the crown moves axially between rest and depressed positions in which a second function is actuated, and to return to its rest position when the pressure is released. In rest position, the crown moves in axial rotation between stable and actuating angular positions to actuate, by crown rotation, the first function via control stem rotation. The control stem is integral axially with the crown to move in axial translation with it during movement into its depressed position, and to be free in axial translation relative to the first actuating device. The control stem cooperates with a second actuating device of the second function when the crown moves into its depressed position to actuate the second function.