Flap-Retaining Clip Structure to Eliminate Vent Leak Paths
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Solution Overview
Problem
Conventional pressure relief devices are susceptible to debris accumulation and leak paths due to notched retainer pins and stepped shoulders, which can lead to fluid infiltration.
Innovation Solution
A flap-retaining clip that securely couples a membrane flap to a housing without leak paths, featuring a main body with a housing-connecting tab, opposed flap-retention wings, and a rounded tip, which traps the membrane flap between the wings and the housing, eliminating the need for a separate retainer bar and stepped shoulder, and is integrally molded as a single piece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If notched retainer pins and stepped shoulders are used to secure the membrane flap, then the membrane flap can be retained on the housing, but debris accumulates in the notches and stepped shoulders creating leak paths
Solution Approach 1:
The patent removes the notched retainer pins and stepped shoulders from the design. Instead, it uses a smooth retainer bar that extends through openings in the membrane flap and is retained by a smooth shouldered post on the housing. This extraction of the problematic notched features eliminates the debris accumulation zones while maintaining the retention function.
Solution Approach 2:
The patent inverts the traditional retention approach by having the retainer bar pass through the membrane flap openings and be retained by a post on the housing, rather than having pins protrude from the housing and be retained by notches in the membrane. This inversion eliminates the notched features that trap debris.
2Reliability
If separate retainer bars and notched pins are used to secure the membrane flap, then the membrane flap can be retained, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent merges the retainer bar and the shouldered post into a single integrated component. The retainer bar is formed as one piece with the shouldered post, eliminating the need for separate retainer bars and notched pins. This reduces the number of parts and simplifies manufacturing while maintaining reliable membrane flap retention.
Solution Approach 2:
The integrated retainer bar assembly serves multiple functions: it retains the membrane flap, provides a sealing surface, and eliminates the need for separate retention components. This multi-functionality reduces device complexity while maintaining retention reliability.
3Reliability
If notched retainer pins are used to secure the membrane flap, then the membrane flap can be retained, but leak paths are created allowing fluid infiltration
Solution Approach 1:
The patent removes the notched features from the retainer pins and replaces them with a smooth retainer bar and smooth shouldered post. This extraction of notched features eliminates the crevices and gaps that create leak paths, preventing fluid infiltration while maintaining membrane flap retention.
Solution Approach 2:
The patent inverts the retention mechanism to use smooth surfaces rather than notched surfaces. The retainer bar passes through smooth openings in the membrane flap and is retained by a smooth shouldered post, creating a seal that prevents fluid infiltration while maintaining retention functionality.
Data Source
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AI summary
A pressure relief assembly (102) includes a housing (100) defining an air passage chamber (105) having at least one opening (106), and a membrane flap secured within the air passage chamber. The membrane flap is configured to move into an open position to expose the opening(s) (106) to relieve air pressure. A plurality of flap-retaining clips (120) securely couple the membrane flap to the housing (100). Each of the plurality of the flap-retaining clips includes a main body (126). A housing-connecting tab extends from a first end of the main body and is retained within a retaining channel formed in the housing. Opposed flap-retention wings (128) laterally extend from opposite sides of the main body (126). A portion of the membrane flap is trapped between the opposed flap-retention wings (128) and the housing.