Serviceable Snap-in Fastener with Molded Fracture Line
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Solution Overview
Problem
Existing snap-in fasteners either require complex multi-piece constructions for separation or are of unitary construction without a mechanism to separate panels after connection, limiting servicing and replacement options.
Innovation Solution
A snap-in retainer formed by multi-shot molding with a pre-established internal fracture line between the base clip and head portions, allowing separation upon axial tensioning, enabling panels to be disengaged and replaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If snap-in fasteners are formed as unitary construction, then manufacturing simplicity is improved, but the ability to separate panels after connection is lost
Solution Approach 1:
The fastener is designed with a pre-defined fracture line that segments the unitary structure into two portions: a first portion remaining attached to the first panel and a second portion remaining attached to the second panel. This allows the fastener to be manufactured as a single piece while enabling separation of connected panels through controlled fracture at the pre-defined line.
2Ease of operation
If snap-in fasteners use multi-piece construction, then panel separability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functions into a single unitary fastener structure. The pre-defined fracture line is integrated during molding, eliminating the need for separate components and assembly steps. This merging approach achieves panel separability without the manufacturing complexity of multi-piece constructions.
3Ease of operation
If sufficient axial tensioning force is applied to multi-piece fasteners, then panel separation is achieved, but risk of panel damage increases
Solution Approach 1:
The pre-defined fracture line is prepared in advance during the molding process, creating a predetermined failure path. When axial tensioning force is applied, the fastener separates cleanly along this pre-established line, preventing uncontrolled fracture and reducing the risk of damage to the connected panels.
Data Source
AI summary
A one piece snap-in retainer of multi-shot molded construction adapted to separate along a molded-in fracture line upon application of axial tensioning force. The retainer includes a base clip portion of molded polymer with a proximal barrel segment and a distal snap-in element projecting outwardly away from the barrel segment. The retainer also includes a head portion of molded polymer at least partially surrounding the proximal barrel segment. The molded-in fracture line includes a protuberance molded into the proximal barrel segment or the head portion at the interface in combination with an opposing complimentary mating depression molded into the other of the proximal barrel segment or the head portion.