Push-Actuated Filter Housing with Key Lock for Tool-Free Replacement
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Solution Overview
Problem
Existing water filtration systems in refrigerators are difficult to replace due to complex designs and placement, leading to awkward access and potential spillage during filter changes.
Innovation Solution
A push-actuated filter housing assembly with a floating key lock mechanism that allows for easy attachment and detachment, featuring a filter key with protrusions for secure mating and a sliding lock for fluid-tight shutoff, enabling simple and tool-free filter replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual insertion and removal mechanism with switches and valve mechanisms is used, then the filter can be replaced, but the operation becomes complex and requires manual activation of multiple components
Solution Approach 1:
The patent combines the locking mechanism and valve operation into a single integrated cartridge assembly. The spring-loaded latch automatically engages with the cartridge to lock it in place and simultaneously operates the valve mechanisms, eliminating the need for separate switches and manual valve activation. This merging of functions simplifies the replacement operation while reducing overall device complexity.
Solution Approach 2:
The spring-loaded latch mechanism automatically engages and disengages the cartridge during insertion and removal operations. The spring provides automatic resetting action that operates the valve mechanisms without requiring manual intervention. This self-service mechanism eliminates the need for users to manually activate switches or control valves during filter replacement.
2Ease of operation
If the filter access is coplanar with the refrigerator wall, then the filter can be accessed, but the access becomes awkward and difficult to reach
Solution Approach 1:
The patent positions the filter cartridge access in a three-dimensional space that is not coplanar with the refrigerator wall. The cartridge is arranged to be accessible from the front or side, creating a staggered or offset configuration that provides easier physical access for users. This dimensional repositioning allows users to reach and replace the filter without awkward bending or stretching, while the internal valve mechanisms remain integrated within the compact housing.
3Ease of operation
If a simple push mechanism is used for filter replacement, then the operation becomes easy and tool-free, but the sealing and spillage prevention may be compromised
Solution Approach 1:
The spring-loaded latch mechanism is pre-loaded to automatically engage sealing surfaces and lock the cartridge in place during the insertion process. The spring force ensures that sealing surfaces are pressed together with adequate force before the user completes the insertion motion, preventing spillage. This preliminary action by the spring mechanism ensures reliable sealing while maintaining the simplicity of the push-based replacement operation.
Solution Approach 2:
The patent employs curved or rounded sealing surfaces in the cartridge and housing interface. The spherical or cylindrical geometry of the cartridge fits into a corresponding curved recess in the housing, creating a self-aligning, fluid-tight seal. This curved interface ensures uniform contact pressure around the entire perimeter, preventing leakage while allowing easy insertion and removal without tools.
Data Source
AI summary
A filter assembly for fluid filtration having a push-activated lock and release mechanism. A push filter design activates a filter key lock upon insertion and extraction, where the filter key may be used simultaneously as a lock and as an identifier for particular filter attributes. The filter housing assembly may be attached to, and removed from, a filter base by a push-actuated release. Upon insertion, the filter key shifts the filter lock longitudinally to receive interlocking segments. Upon extraction, the same axial push shifts the filter lock further to align the interlocking fingers within gaps that allow for easy extraction. The specific key lock design allows a user to identify and match certain filter configurations received by the mechanical support, and reject other filter configurations.