Appliance Door Handle Assembly for Tolerance Gap Compensation
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Solution Overview
Problem
Household appliance door handles often exhibit visually undesirable gaps and pressure points due to component and manufacturing tolerances, which can lead to a flawed assembly and visible imperfections on the appliance door.
Innovation Solution
A door handle system featuring a compensating element with reduced stiffness, preferably made of elastically flexible material, is integrated between the handle holder and the appliance door to fill gaps and absorb assembly forces, ensuring a seamless and pressure-point-free installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid handle holder is used to ensure structural stability, then the handle holder provides strong support, but gaps and pressure points appear due to manufacturing tolerances
Solution Approach 1:
A compensating element is introduced as an intermediary component between the rigid handle holder and the door panel. This compensating element absorbs manufacturing tolerances and prevents direct contact between the handle holder and door panel, eliminating gaps and pressure points while maintaining structural stability.
Solution Approach 2:
The compensating element changes its physical parameters (compression, deformation) to accommodate manufacturing tolerances. By allowing the compensating element to compress or deform, the system absorbs dimensional variations without transmitting them to the door panel, thus preventing visible gaps and pressure points.
2Reliability
If assembly forces are applied to ensure tight contact, then the handle holder contacts the door panel firmly, but pressure points and visible imperfections appear on the door panel
Solution Approach 1:
The compensating element serves as a mediator that absorbs assembly forces before they reach the door panel. By placing the compensating element between the handle holder and door panel, the system achieves tight contact without transmitting harmful pressure points to the door panel surface.
Solution Approach 2:
The compensating element is pre-installed as a cushioning layer between the handle holder and door panel. This beforehand cushioning prevents direct force transmission to the door panel during assembly, eliminating pressure points while ensuring reliable contact.
3Ease of manufacture
If the handle holder is directly mounted on the door panel, then the installation is simple, but gaps due to tolerances require rework
Solution Approach 1:
The compensating element is integrated with the handle holder assembly, combining multiple functions (gap filling, force absorption, sealing) into a single pre-assembled unit. This merging allows the entire assembly to be installed as one component, maintaining installation simplicity while ensuring visual quality through the built-in compensating element.
4Ease of operation
If the stop is changed to improve door operation, then the door function is enhanced, but existing pressure points from the handle holder remain visible
Solution Approach 1:
The compensating element acts as a permanent intermediary that protects the door panel from pressure points regardless of stop changes. By maintaining the compensating element between the handle holder and door panel, the system allows stop modifications to improve door operation without creating new visible pressure points.
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 visually flawless and easily installable door handle that maintains a joint-free contact with the appliance door, preventing deformation of the door panel and ensuring a stable, full-surface contact, thus enhancing the aesthetic and operational quality of the appliance.
Implementation Method 1
the compensating element should have a greatly reduced component stiffness compared to the handle holder... if the compensating element is designed to be elastically flexible... at least part of the assembly forces can be absorbed by deforming the compensating element
Data Source
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AI summary
The invention relates to a domestic appliance having an appliance door (1), the door handle (3) of which comprising a handle piece (7) that is mounted on the visible outer wall (11, 15) of the appliance door (1) by means of at least one handle piece holder (5). According to the invention, a compensatory element (19) is arranged between the handle piece holder (5) and the outer wall of the appliance door (11, 15), which closes a tolerance-related gap (s) formed between the outer wall of the appliance door (11, 15) and the handle piece holder (5).