Control Panel Knob Holder Snap-Fit for Space-Saving Fixation
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Solution Overview
Problem
Conventional household appliances with pop-out type control knobs require space-occupying additional fixing elements and complex multicomponent arrangements, which are not ideal for limited spaces and are cumbersome.
Innovation Solution
A control panel with integral ridges and clamping slots engages directly with knob holders, eliminating the need for auxiliary fixing means by using latching devices with inwardly bending tip portions that lock into the slots, providing a secure and space-efficient connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fixing elements (grooves, supporting means, adhesive tape) are used to attach knob holders to the front panel, then the knob holders can be securely fixed, but the arrangement occupies excessive space and creates a complex multicomponent structure
Solution Approach 1:
The fixing elements are integrated directly into the front panel structure. The ridge with clamping slots is formed as an integral part of the front panel, eliminating the need for separate fixing components. The knob holder's latching device engages directly with this integrated structure, merging the panel and fixing mechanism into a unified component.
Solution Approach 2:
The adhesive tape layer is completely removed from the fixing system. The invention replaces chemical adhesion with a purely mechanical engagement system where the latching device of the knob holder directly engages with the clamping slots of the ridge, extracting the adhesive component from the assembly.
2Reliability
If conventional fixing elements (grooves, supporting means, adhesive tape) are used to attach knob holders to the front panel, then the knob holders can be securely fixed, but additional space is occupied by these fixing elements
Solution Approach 1:
The fixing mechanism is merged with the front panel itself. The ridge with clamping slots is formed integrally from the front panel material, so no additional space is required for separate fixing elements. The entire fixing structure is contained within the profile of the front panel.
Solution Approach 2:
Instead of adding external fixing elements to the front panel, the invention inverts the approach by creating fixing features (clamping slots) directly within the panel's existing structure. The ridge protrudes inward from the panel surface, utilizing the panel's own material to create the fixing mechanism.
3Reliability
If multiple components (front panel, secondary panel, adhesive tape) are used, then the knob holders can be fixed, but the arrangement is cumbersome and difficult to assemble
Solution Approach 1:
The invention merges the front panel and secondary panel into a single integrated front panel assembly. The ridge with clamping slots is formed as part of this unified structure, eliminating the need for separate secondary panels and reducing assembly steps to a simple snap-fit operation.
Solution Approach 2:
The adhesive tape layer is completely extracted from the assembly process. The fixing system relies solely on the mechanical engagement between the latching device and clamping slots, allowing for tool-free assembly and disassembly without requiring adhesive application or curing time.
4Reliability
If conventional fixing elements are used, then the knob holders can be attached, but the fixing elements are visible and disrupt the uniform surface appearance
Solution Approach 1:
The fixing elements are merged into the front panel's existing profile. The ridge with clamping slots is formed as an integral structural feature of the panel itself, making the fixing mechanism indistinguishable from the panel's normal geometry and maintaining a uniform surface appearance.
Data Source
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AI summary
The present invention relates to a household appliance comprising a number of control knobs on a control panel (20) having knob openings (26) and corresponding knob holders (10) with a hollow body for securely holding and fixing of said knobs. The control panel (20) further comprises an inwardly arranged integral ridge (24) in the circumferential vicinity of each knob opening (26) wherein each ridge (24) comprises at least one clamping slot (25) arranged in perpendicular direction to the control panel (20), and the knob holder (10) comprises a latching device (16) having a tip portion (11) arranged to be fixedly engaged with the slot (25) when the knob holder (10) abuts to the circumferential area of said ridge (24). With the arrangement as defined hereinabove knob holders (10) are directly attached to the control panel (20) without space occupying fixing means and additional components.