Control Knob Mounting Structure for Impact-Resistant Appliances
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Solution Overview
Problem
Existing household appliance knobs are prone to dislodging due to exterior impacts and vibrations, as the gaps between the clawed structures for ease of production weaken the resistance against such forces, compromising both safety and user experience.
Innovation Solution
An interconnecting element with a rear set and claws that securely fasten the knob to the control panel, providing enhanced resistance against external forces through a radial extension and snap-fit mechanism, ensuring the knob remains firmly attached during rotations and impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the knob is mounted on the control panel by means of clawed structures for ease of production, then the manufacturing process is simplified, but the resistance of the knob against exterior impacts is weakened causing the knob to get loose and dislodge
Solution Approach 1:
The mounting structure is divided into multiple claws (at least two claws) that are integrated into the interconnecting element. These claws engage with corresponding features on the control panel to provide distributed mechanical interlocking, maintaining strength while preserving ease of assembly through modular design
Solution Approach 2:
The interconnecting element integrates multiple functional features within a single component: the body housing, the claws for panel attachment, the rear set for shaft engagement, and the front set for knob retention are all nested within or integrated into one interconnecting element, simplifying manufacturing while maintaining structural integrity
2Ease of operation
If gaps are left around the clawed structures to facilitate rotation of the knob, then the rotation ease is improved, but the structural strength is reduced making the knob vulnerable to impacts and vibrations
Solution Approach 1:
The interconnecting element provides different structural characteristics in different regions: the claws are designed with appropriate clearance for smooth rotation operation, while the body and engagement features maintain sufficient mass and rigidity for impact resistance. The rear set extending radially around the shaft end provides localized reinforcement without interfering with rotational movement
3Reliability
If the knob is securely fastened to prevent dislodging under load, then the safety and quality perception are improved, but the device complexity increases
Solution Approach 1:
Multiple mounting functions are merged into a single interconnecting element: the claws for panel attachment, the rear set for shaft engagement, and the front set for knob retention are all integrated into one component. This consolidation provides secure fastening while actually reducing overall complexity compared to separate components for each function
Solution Approach 2:
The claws are designed to automatically engage and lock into position during assembly without requiring additional fastening operations. The interconnecting element self-secures to the control panel and shaft through the claw engagement mechanism, eliminating the need for separate screws or clips
Data Source
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AI summary
The present invention relates to a household appliance (1) such as laundry washer/dryer, dishwasher or a cooking appliance, that comprises a control panel (2); a main control card (3) disposed behind the control panel (2); an encoder (4) that is connected to the main control card (3) and that enables the user adjustments to be transferred to the main control card (3); a shaft (5) that is connected to the encoder (4); a knob (6) that moves the shaft (5), and an opening (7) that is disposed on the control panel (2) and wherein the knob (6) is placed, and an interconnecting element (8) disposed between the shaft (5) and the knob (6).