Handle assembly for an appliance door
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Solution Overview
Problem
Current handle assemblies for domestic appliances lack geometrical features that provide adequate installation feedback, leading to potential mis-assembly and improper function, and do not effectively control the position of fasteners during assembly.
Innovation Solution
A handle assembly design featuring a mounting stud with an angled contact surface, a catch feature, and a reverse chamfer, which includes a threaded fastener that provides visual and mechanical feedback for correct installation, ensuring secure attachment to the appliance door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fastener designs are used, then the handle assembly can be manufactured with simple structures, but the installer receives inadequate feedback regarding proper installation and mis-assembly conditions occur more frequently
Solution Approach 1:
The mounting fastener incorporates geometrical features including an angled contact surface and a catch feature that provide tactile and visual feedback to the installer during assembly. The catch feature engages with a corresponding feature on the handle, creating a positive stop that indicates correct installation. This feedback mechanism reduces mis-assembly conditions while maintaining reasonable structural complexity.
Solution Approach 2:
Instead of providing feedback through additional separate components or markings, the invention inverts the approach by embedding the feedback mechanism directly into the fastener's geometrical structure. The angled contact surface and catch feature are integral to the fastener itself, allowing the fastener to communicate installation status through its own form rather than requiring external indicators.
2Manufacturing precision
If conventional fastener designs without direct reference to handle mating surface are used, then the fastener structure can be simpler, but it becomes difficult to control the position of the fastener in the assembly
Solution Approach 1:
The mounting fastener acts as an intermediary element that directly references the handle mating surface through its angled contact surface. This geometric reference feature establishes a precise positional relationship between the fastener and the handle, controlling fastener position during assembly. The angled surface provides a mechanical datum that ensures consistent alignment without requiring complex positioning mechanisms.
3Reliability
If set screw fasteners are used without proper engagement features, then the assembly process can be simpler, but the set screw may not properly engage the mounting fastener resulting in handle malfunction
Solution Approach 1:
The catch feature on the mounting fastener provides positive engagement feedback to the set screw during assembly. As the set screw is tightened, the catch feature engages with a corresponding feature on the handle, creating a distinct tactile and visual indication of proper engagement. This feedback mechanism ensures reliable fastener engagement while maintaining straightforward assembly procedures.
Solution Approach 2:
The mounting fastener is pre-configured with the catch feature and angled contact surface during manufacturing, establishing the engagement geometry before assembly occurs. This preliminary preparation ensures that when the set screw is installed, proper engagement is achieved through the pre-formed geometrical relationship between the fastener and handle features, reducing assembly complexity.
Data Source
AI summary
A door assembly for an appliance includes a door comprising an outer door panel, a mounting stud extending from the outer door panel along an axial direction, the mounting stud defining an angled contact surface and a catch feature that protrudes along a radial direction from an end of the angled contact surface, a handle tube defining a threaded aperture, and a threaded fastener that passes through the threaded aperture and engages the angled contact surface to secure the handle tube to the door. The mounting stud also defines a reverse chamfer at a distal second end of the mounting stud.