Rotary Selector Switch U-Shaped Leaf Spring Latching
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Solution Overview
Problem
Existing rotary selector switches for household appliances are complex, sensitive to dirt, and prone to wear and tear, leading to unreliable latching and increased maintenance costs due to multiple components and potential friction issues.
Innovation Solution
A rotary selector switch featuring a U-shaped leaf spring providing radial forces for uniform latching, integrated with a switch housing and optoelectronic components for wear-free detection, and a pre-fitted modular printed circuit board for simplified assembly and reduced parts costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple spring components and rollers are used to provide latching force, then the latching function is achieved, but the device complexity increases and sensitivity to dirt increases
Solution Approach 1:
Multiple spring components are merged into a single U-shaped leaf spring that provides latching force through its elastic deformation. The leaf spring integrates the function of multiple separate springs and rollers into one monolithic component, reducing complexity while maintaining the latching function.
Solution Approach 2:
The U-shaped leaf spring serves multiple functions simultaneously: it provides latching force, guides the cam body movement, and acts as a structural support element. This multi-functionality eliminates the need for separate components for each function.
2Ease of operation
If rollers and balls are used to interact with the latching link, then the latching movement is enabled, but wear and tear increases and maintenance costs increase
Solution Approach 1:
The mechanical contact between rollers/balls and the latching link is replaced by a cam mechanism where the cam body's profile directly interacts with the leaf spring. This substitution eliminates rolling friction and point contact wear, replacing it with distributed line contact that is more durable.
Solution Approach 2:
Instead of having the latching link actively engage with rollers or balls, the design inverts the interaction: the cam body's profile passively guides the leaf spring's deformation, and the leaf spring's elasticity provides the latching force. This reversal reduces wear on critical components.
3Reliability
If a complex latching mechanism with multiple components is used, then the latching function is achieved, but assembly work and parts costs increase
Solution Approach 1:
The U-shaped leaf spring is manufactured as a single integrated component that combines the functions of multiple separate springs, rollers, and mounting structures. This merging significantly reduces the number of parts to be assembled and lowers manufacturing complexity.
Solution Approach 2:
The rotary selector switch is designed with modular segments: the cam body can be separately manufactured and then assembled with the integrated leaf spring assembly. This segmentation allows for specialized manufacturing of each module while simplifying the final assembly process.
4Device complexity
If the latching mechanism is exposed without housing protection, then the structure is simpler, but protection against dirt and moisture is reduced
Solution Approach 1:
A housing structure is introduced that encloses the latching mechanism, providing protection against dirt and moisture. The housing acts as a barrier while allowing the cam body to rotate and the leaf spring to function through controlled openings or transparent sections.
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
The solution provides a reliable, low-wear, and easy-to-install rotary selector switch with a uniform latching feel, reduced friction, and enhanced protection against dirt and moisture, while minimizing assembly complexity and costs.
Implementation Method 1
the spring means is designed as a leaf spring bent in a U-shape, the free limbs of which lie opposite one another in the end region on the outer circumference of the cam body, each providing a radial force. The radial forces acting on the shaft bearing are thus canceled out
Implementation Method 2
The movement is detected by means of optoelectronic components in order to ensure wear-free switching
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The switch (4) has control shaft (5) for transferring rotational movement from operating handle (19) on a cam structure (6) for interacting with a stationary spring (7). The spring is formed as U-shaped bent leaf spring, such that free leg in end region lying opposite on the outer circumference of cam structure provides the bearing capacity of respective radial force. An independent claim is included for operating device of domestic appliance.