Tumble Dryer Door Trim Ring Radial Bayonet Locking
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Solution Overview
Problem
Existing tumble dryer designs face challenges in cost-effectively connecting the door trim ring to the door support ring in a confined space, as traditional methods like welding, riveting, and gluing are unfavorable due to design constraints and visibility concerns, and require additional fixing elements to maintain the door's position.
Innovation Solution
A radial bayonet catch mechanism is employed, where the door trim ring is locked to the door support ring with bayonet catches distributed around the circumference, utilizing a spring bar and clamping web for self-retaining locking, allowing for a space-saving connection that can be released without tools, and featuring cover caps to secure the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional joining methods (welding, riveting, gluing) are used to connect the door trim ring to the door support ring, then the connection is strong and reliable, but the visible surfaces are negatively influenced and the process is uneconomical
Solution Approach 1:
The joining process is extracted from the visible front surface and relocated to the rear side of the door assembly. The bayonet catch mechanism is installed on the rear side, allowing the door trim ring to be connected to the door support ring without affecting the visible front surfaces, thus maintaining aesthetic quality while enabling cost-effective assembly.
2Ease of manufacture
If clamping in the axial direction is used to join the door trim ring, then the assembly process is economical and simple, but the installation space is insufficient
Solution Approach 1:
The joining direction is changed from axial clamping to radial engagement. Instead of clamping the door trim ring in the axial direction where space is limited, the bayonet catch mechanism engages radially, allowing the necessary installation space to be available while maintaining economical assembly processes.
3Reliability
If fixing elements are added to keep the door trim ring in position, then the door assembly is secure, but the device complexity increases
Solution Approach 1:
The fixing function is merged into the door caps that are already required for the hinge and locking catch assemblies. The door caps serve dual purposes: they cover the hinge and locking catch mechanisms while simultaneously providing the fixing function to secure the door trim ring to the door support ring, thereby avoiding additional fixing elements.
4Device complexity
If the entire door must be replaced when the door trim ring is defective, then assembly simplicity is maintained, but the ease of repair and cost-effectiveness deteriorate
Solution Approach 1:
The door assembly is segmented into separable components: the door trim ring is made as a separate, independently replaceable part from the door support ring and door caps. The bayonet catch mechanism enables the door trim ring to be detached and reattached without affecting other door components, allowing defective trim rings to be replaced individually rather than replacing the entire door assembly.
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
This solution enables a cost-effective, space-efficient locking mechanism that prevents misuse and allows for easy replacement of the door trim ring if defects occur, maintaining the door's integrity without requiring full door replacement, while ensuring secure closure and easy disassembly.
Implementation Method 1
one catch consists of a spring bar formed on the door support ring, which interacts with a clamping web formed on the door trim ring
Data Source
Figure 1~3
Figure 4~6
AI summary
The invention relates to a laundry treatment machine, in particular a tumble dryer, with a drum that is rotatably mounted in a housing and has a loading opening on the front side of the housing that can be closed with a door (1), the door (1) consisting of a consists of a door carrier ring (4) which can be locked by means of a locking catch (3) and to which door trim rings (5) and (6) are fastened. According to the invention, at least the door trim ring (5) attached to the front side of the door support ring (4) is fixed to the door support ring (4) by radially arranged catches (41, 51).