MDF Panel Fastener With Asymmetric Retention for 90° Alignment
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Solution Overview
Problem
Medium-density fiberboard (MDF) panels are difficult to join at 90-degree angles using screws due to susceptibility to stripping or crumbling, and metal dowels are challenging to align and rotate during assembly.
Innovation Solution
A fastener with a screw receiving element and a plate-shaped retention element that includes lobes or a polygonal shape, designed to align and secure MDF panels by preventing rotation and ensuring proper alignment through a unique cavity and recessed portion configuration, allowing for easy assembly and secure connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal dowels are used to join MDF panels at 90-degree angles, then the connection strength is improved, but the alignment difficulty and rotation susceptibility increase
Solution Approach 1:
The fastener employs an asymmetric retention element with a plate-shaped body that has a distinct front face and rear face, creating a non-symmetric geometry that prevents rotation during assembly. The retention element's asymmetric shape ensures proper orientation when inserted into the corresponding asymmetric recess in the MDF panel, eliminating the alignment and rotation issues associated with symmetric metal dowels.
2Strength
If metal dowels are used to join MDF panels, then connection strength is improved, but the rotation susceptibility during assembly increases
Solution Approach 1:
The retention element's asymmetric geometry with distinct front and rear faces creates a non-rotatable configuration. When the retention element is inserted into the corresponding asymmetric recess, the asymmetric shapes mate in only one orientation, providing rotational stability and preventing the fastener from rotating during assembly, thereby maintaining connection reliability.
3Manufacturing precision
If a plate-shaped retention element with lobes is used, then alignment precision is improved, but the device complexity increases
Solution Approach 1:
The fastener is segmented into distinct functional components: a cylindrical body for receiving the screw and a plate-shaped retention element with lobes for alignment. This segmentation allows each component to perform its specific function optimally while maintaining overall simplicity. The retention element can be integrated with or separate from the cylindrical body, providing design flexibility without significantly increasing complexity.
Data Source
AI summary
A fastener including a screw receiving element extending along a first axis and having a first end and a second end, the screw receiving element including a through hole extending through a thickness of the screw receiving element perpendicular to the first axis, the fastener further including a retention element arranged at the first end of the screw receiving element, wherein the retention element is plate-shaped and extends in a direction perpendicular to the first axis of the screw receiving element, and the retention element further includes a panel facing surface extending in a plane substantially perpendicular to the first axis of the screw receiving element, and side surfaces extending in planes substantially along the first axis of the screw receiving element.