Magnetic Control Knob Base for Stable Detent Positioning
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Solution Overview
Problem
Existing operating devices for household appliances face issues with user-friendliness and stability, as the detachable control elements can easily shift or separate, leading to incorrect settings and impaired cleanability.
Innovation Solution
A magnetic interaction system between the control element base and attachment, combined with a sliding aid element and anti-slip protection, ensures stable and precise positioning, allowing for non-destructive detachment and easy cleaning while maintaining reliable functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the control element attachment is mounted almost solely by weight on the base, then the structure is simple and easy to manufacture, but the position of the rotating ring changes easily in the vertical direction and may separate completely from the base
Solution Approach 1:
The control element is divided into separate parts: a base and a rotatable attachment. The base remains stationary while the attachment can be detached and reattached, allowing easy manufacturing and cleaning of individual components while maintaining operational stability through magnetic coupling.
Solution Approach 2:
The mechanical weight-based mounting system is replaced with a magnetic field-based holding system. The holding magnet in the base interacts magnetically with the control element attachment, providing secure retention without relying solely on gravitational force, thus preventing vertical displacement and separation.
2Ease of manufacture
If the control element attachment is easily detachable, then the cleanability is improved, but the user-friendliness during operation is impaired due to position changes and possible separation
Solution Approach 1:
The control element is segmented into a base and a detachable attachment, enabling separate cleaning of each component. The attachment can be removed from the base for thorough cleaning while maintaining a simple overall structure that is easy to manufacture and maintain.
Solution Approach 2:
The magnetic field-based holding mechanism replaces mechanical fastening systems, allowing for easy non-destructive detachment for cleaning purposes. The magnetic coupling provides secure retention during normal operation, preventing unwanted position changes, while enabling simple removal when cleaning is required.
3Reliability
If a magnetic holding system is used to secure the control element base, then the stability is improved, but the device complexity increases due to additional magnetic components
Solution Approach 1:
The holding magnet is integrated directly into the control element base, combining the mounting function and the magnetic holding function into a single component. This eliminates the need for separate magnetic assemblies and reduces overall device complexity while maintaining stable magnetic retention of the control element attachment.
Solution Approach 2:
The holding magnet serves multiple functions: it secures the control element attachment to the base, enables easy detachment for cleaning, and maintains precise positioning during operation. This multi-functionality reduces the need for additional components, thereby minimizing device complexity while achieving reliable stability.
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 enhances user-friendliness by providing precise rotary position locking, improves cleanability, and reduces wear, ensuring stable and precise settings of operating conditions.
Implementation Method 1
a holding magnet is arranged, which in the assembled state of the control element base with the control element receptacle in magnetic interaction with a control element-external magnet and thus the control element base is held magnetically on the control element receptacle
Implementation Method 2
the holding magnet interacts magnetically with magnetic interaction elements in the control element attachment in such a way that, depending on the rotational position of the control element attachment relative to the control element base, at least one specific rotational position is configured as a locking position or a rotational position is locked by the magnetic interaction
Data Source
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AI summary
The invention relates to an operating device (8) for a household appliance (1), comprising a control element receptacle (9) and a control element (10) which has a control element base (12) and a control element attachment (13) that can be detachably attached to the control element base (12) without damage and, in the attached state, is accessible to a user relative to the control element base (12) and rotatable for setting operating conditions of the household appliance (1), and the control element base (12) can be detachably attached to the control element receptacle (9) without damage, wherein the control element base (12) has a downwardly projecting projection (14) on an underside (15) which, in the state arranged in the control element receptacle (9), overlaps a front edge (20) of the control element receptacle (9) when viewed in the vertical direction, and wherein a retaining magnet (29) is arranged in the control element base (12).which, in the assembled state of the control element base (12) with the control element receptacle (9), is in magnetic interaction with a magnetically interacting element (30) external to the control element, and thereby the control element base (12) is magnetically held on the control element receptacle (9), wherein the holding magnet (29), in the assembled state of the control element attachment (13) with the control element base (12), is in magnetic interaction with interaction elements (32) in the control element attachment (13) such that, depending on the rotational position of the control element attachment (13) relative to the control element base (12), at least one specific rotational position is formed as a detent position.