Magnet Holder With Retaining Ribs for Adhesive-Free Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnet holder inserts face challenges such as additional assembly steps, increased costs, and potential assembly failures due to the need for protective coatings or fastening systems, which can compromise magnetic field strength and adhesion, especially when dealing with dissimilar materials like cellulosic wood and ferrite powder mixed in a rubber or polymer matrix.
Innovation Solution
A hollow molded plastic magnet holder with inwardly projecting retainers for a secure press fit of the magnet and external ribs with spaced gaps for easy insertion into a finished part, eliminating the need for adhesives or holes that could weaken the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective outer coating or cover is added to protect the magnets, then the magnets are protected from physical damage and kept in place, but the assembly process becomes more complex and costly with additional steps
Solution Approach 1:
The protective housing and magnet retention features are merged into a single integrated component. The housing includes built-in ribs that perform both structural support and retention functions, eliminating the need for separate protective coatings or additional fastening elements.
Solution Approach 2:
The housing design incorporates self-retaining features through its geometric structure. The ribs and openings in the housing automatically secure the magnet through friction and geometric interlocking during the press-fit process, without requiring external fasteners or complex assembly procedures.
2Reliability
If a screw or shank type fastening system is used to attach the magnet holder, then the magnet is securely attached to the finished part, but a hole must be made in the magnet which changes the magnetic field pattern and reduces magnetic field strength
Solution Approach 1:
The fastening function is extracted from the magnet itself and transferred to the housing structure. The housing contains all attachment features (ribs, openings, and geometric retention elements) needed to securely attach the assembly to the finished part without penetrating or modifying the magnet.
Solution Approach 2:
The housing acts as an intermediary between the magnet and the finished part. It provides the attachment interface and mechanical connection features, allowing the magnet to remain intact while still achieving secure attachment to the final product.
3Ease of manufacture
If adhesive methods are used to build the magnet holder insert and final assembly, then the components are joined together, but adhesion deteriorates over time due to dissimilar materials (cellulosic wood, ferrite powder in rubber/polymer matrix, engineered plastic)
Solution Approach 1:
Chemical adhesion methods are replaced with a mechanical retention system. The housing uses geometric features (ribs, openings, and friction-based press-fit interfaces) to mechanically secure both the magnet and the attachment to the finished part, eliminating reliance on adhesives that fail with dissimilar materials.
4Reliability
If multiple retainers are added to securely hold the magnet in the housing, then the magnet is firmly held in place, but air passage is blocked during assembly
Solution Approach 1:
The retention feature is segmented into multiple discrete ribs with openings between them. This segmentation allows the ribs to provide retention contact points while the openings maintain air passage and allow debris ejection during the press-fit assembly process.
Solution Approach 2:
Different portions of the housing have different functional qualities. The ribs provide localized retention contact where needed, while the openings between ribs provide localized air passage and debris ejection paths. This spatial differentiation of qualities resolves the conflict between retention and assembly ease.
Data Source
AI summary
A magnet holder insert comprising a magnet and magnet holder housing designed with internal wall features capable of keeping the magnet properly positioned in the holder device, and external wall features capable of keeping the magnet holder device securely mounted in the finished part. The internal and external fastening elements of the magnet holder housing are designed in such a way as to promote rapid and secure assembly of both the magnet device and the finished part. The exposed surface of the magnet holder device can be configured with flat or dome shaped exposed contact surfaces, depending on how secure or flexible the magnetic joining feature is intended, capable of attaching to another magnet device or a material susceptible to magnetic attraction.