Switch Device Separation Regulation for Timepiece Engagement
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Solution Overview
Problem
Existing switch devices for timepieces, such as wristwatches, face issues where the engaging section of the stopper member is lifted and separated from the engaging groove when the operation member is forcefully pulled or rotated, leading to the operation member slipping out of the base member.
Innovation Solution
A switch device with a separation regulation section that positions the leading end of the engaging section toward the axial center of the operation member, preventing separation from the engaging groove, even when the operation member is forcefully pulled or rotated, by using a brim section on the inner surface of the base member to hold down the engaging section and maintain its position within the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engaging section of the stopper member is held down by a hold down plate to prevent separation from the engaging groove, then the reliability of engagement is improved, but when the operation member is forcefully pulled outward, the engaging section is lifted and separated against the hold down force, causing the operation member to slip out
Solution Approach 1:
The invention introduces a new spatial dimension by adding a separation regulation section that extends in the axial direction of the operation member. This axial extension creates a new constraint plane that prevents the engaging section from being lifted outward, complementing the radial hold-down force of the hold down plate. The combination of radial constraint (hold down plate) and axial constraint (separation regulation section) creates a three-dimensional engagement prevention system that effectively blocks all separation paths.
Solution Approach 2:
The invention divides the engagement prevention function into two distinct functional segments: the hold down plate that provides radial holding force, and the separation regulation section that provides axial positioning and prevents outward movement. This segmentation allows each component to specialize in a specific direction of constraint, making the overall system more effective than a single-component solution.
2Reliability
If the leading end portion of the engaging section is positionally regulated toward axial center by the separation regulation section when the operation member is pulled outward, then prevention of separation is improved, but the device structure becomes more complex
Solution Approach 1:
The separation regulation section is merged with the base member as an integral structure rather than being a separate component. The brim section and axial side surface are formed directly on the base member, eliminating the need for additional parts. This merging approach maintains the separation prevention function while reducing assembly complexity and part count.
Solution Approach 2:
The base member is given multiple functions: it provides structural support, contains the stem insertion hole, and incorporates the separation regulation section as an integral feature. By making the base member multi-functional, the invention avoids adding separate components for each function, thereby reducing overall device complexity while maintaining reliable separation prevention.
Data Source
AI summary
A switch device including a base member provided with a stem insertion hole, an operation member which is slidably inserted into the stem insertion hole of the base member and has an engaging groove provided in an outer circumference surface, a stopper member having an engaging section which is arranged in the engaging groove of the operation member and moved along with sliding of the operation member, and a separation regulation section which prevents the engaging section from being separated from the engaging groove, in which a leading end portion of the engaging section is positionally regulated toward axial center of the operation member by the separation regulation section when the operation member is pulled toward the outside of the base member.