Household Appliance Cover Locking Assembly for Foolproof Alignment
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Solution Overview
Problem
Existing uncovering assemblies for household appliances, such as juicers, face issues with the cover being easily loosened during operation, leading to safety concerns and poor visual foolproofing, resulting in frequent assembly errors.
Innovation Solution
An uncovering assembly with a positioning portion on the cover that cooperates with a positioning structure on the appliance shell, featuring a lock catch with a reciprocating movement mechanism, a slideway, and a transmission mechanism to ensure the cover remains securely locked and aligned, preventing accidental rotation and ensuring accurate connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screwing structure is used to lock the cover, then the cover can be secured during operation, but the cover continuously vibrates and loosens during squeezing, causing safety issues and requiring frequent reassembly
Solution Approach 1:
The locking mechanism is segmented into multiple independent locking points (first locking point with first elastic fastener and second locking point with second elastic fastener) instead of a single screw connection. This segmentation distributes the locking force and prevents the cover from loosening during vibration, while still allowing easy assembly and disassembly through the elastic fasteners.
Solution Approach 2:
The elastic fasteners automatically engage with the locking grooves when the cover is placed on the main machine body, providing self-locking functionality without requiring user intervention. The elastic deformation of the fasteners creates automatic engagement and disengagement, making the assembly process simple and reliable.
2Ease of manufacture
If a screwing structure is used, then the cover can be attached to the main machine body, but visual foolproofing is not achieved and users frequently fail to mount the cover properly
Solution Approach 1:
The positioning structure uses asymmetric design with positioning portions on the cover that correspond to positioning grooves on the main machine body. This asymmetric configuration provides visual and tactile guidance for proper alignment, making it obvious when the cover is correctly positioned, thereby preventing improper assembly.
Solution Approach 2:
The patent employs visual indicators (such as color coding or visual markers on the positioning portions and positioning grooves) to provide foolproof guidance. When the cover is correctly aligned, the positioning portions fit into the positioning grooves, and users can visually confirm proper mounting, eliminating assembly errors.
3Reliability
If a safety switch is added to detect cover loosening, then safety can be improved, but the system complexity increases and the safety switch becomes invalid over time
Solution Approach 1:
The elastic fasteners with locking grooves provide self-detecting locking functionality. When the cover is properly locked, the elastic fasteners engage with the locking grooves, creating a mechanically self-evident locked state. This eliminates the need for external safety switches while maintaining safety, as the locking mechanism itself provides the detection function through its mechanical engagement.
Solution Approach 2:
The patent extracts the safety detection function from a separate electronic safety switch and integrates it directly into the mechanical locking structure through the elastic fasteners and locking grooves. This integration eliminates the need for complex electronic detection systems while maintaining reliable safety functionality.
Data Source
AI summary
Provided are an uncovering assembly of a household appliance, and a household appliance. A positioning portion cooperates with a positioning structure on a shell of the household appliance in the uncovering assembly, a cover is prevented from being loosened relative to the shell, in this way visual fool proofing may be achieved. A lock catch switches from an unfastening position to a fastening position after the positioning portion cooperates with the positioning structure. The lock catch, after entering the fastening position, is in mutual restriction with a fastening structure in a vertical direction.