Cam-Actuated Draw Latch Filter Cartridge Retention
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Solution Overview
Problem
Existing filter assemblies face challenges in easily exchanging replaceable filter cartridges in crowded environments and often result in fluid leakage during replacement, requiring complex rotation mechanisms and additional tools.
Innovation Solution
A filter assembly with a draw latch retention feature that allows cartridge installation without rotation and an efficient axial sealing interface, utilizing a cam-actuated retainer and keeper mechanism to secure and release the cartridge, minimizing fluid leakage and tool requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spin on or bayonet attachments are used to secure the filter cartridge, then the filter element can be securely retained to the filter head, but the filter cartridge requires rotation relative to the filter head which is problematic in crowded environments
Solution Approach 1:
Instead of requiring the cartridge to rotate onto the head (conventional approach), the invention uses a draw latch mechanism where the retainer is pulled or drawn into a locked position to secure the cartridge. This inversion of the engagement sequence eliminates the need for rotation while maintaining secure retention.
Solution Approach 2:
The invention extracts the rotation requirement from the retention mechanism by using a separate draw latch system. The cam-actuated retainer and keeper mechanism provides secure retention independently of any rotational movement, allowing installation in crowded spaces where rotation is impractical.
2Reliability
If threaded rods or spin on attachments are used to secure the filter element, then the element can be held in sealed engagement with the filter head, but additional tools or complex mechanisms are required for installation
Solution Approach 1:
The invention merges the sealing function and retention function into a single integrated draw latch mechanism. The cam-actuated retainer simultaneously provides both the sealing engagement and the retention force, eliminating the need for separate threaded rods or complex multi-component attachment systems.
Solution Approach 2:
The draw latch mechanism is designed to be self-securing through the cam action that automatically engages the retainer with the keeper when the cartridge is installed. The mechanism self-regulates to provide proper sealing and retention without requiring additional tools or complex adjustment procedures.
3Productivity
If filter replacement is performed in the field, then service can be maintained quickly, but fluid leakage into the environment may occur during replacement
Solution Approach 1:
The draw latch mechanism is designed to maintain sealing engagement throughout the entire replacement process. The cam-actuated retainer keeps the cartridge securely sealed to the head until the moment of intentional removal, preventing premature fluid leakage while enabling quick field service when needed.
Data Source
AI summary
A draw latch retainer is used to secure a filter cartridge to a filter head. A cam actuated retainer extends from the head to engage a keeper in the top of the cartridge. Rotation of the cam draws the retainer and cartridge axially toward the head into an installed position. The retainer extends through an aperture in the upper portion of the cartridge to apply a retention force against the bottom side of the keeper. The keeper and upper portion of the cartridge supporting the keeper are configured to transmit the retaining force laterally across the top of the cartridge. A pair of axial conduits project from the cartridge and mount O-ring seals for implementing an axial sealing interface with passages in the head.