Snap-Fit Enclosure for Light String Shroud Assembly
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Solution Overview
Problem
Existing light string assembly methods require external fasteners, such as screws, which can lead to over-driving or under-driving issues, potentially breaking the shroud or socket, especially when made from plastics, increasing assembly time and labor.
Innovation Solution
A snap-fit enclosure design where a cap with cooperating locking elements secures to a neck with cut-outs, eliminating the need for external fasteners by using a channel and ramped surfaces and lips to lock the cap onto the neck, allowing the light elements to be secured within the shroud without additional fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external fasteners such as screws are used to secure the shroud to the socket, then the assembly is firmly secured, but the risk of over-driving or under-driving increases which can break the plastic shroud or socket
Solution Approach 1:
The patent replaces the traditional mechanical fastening system (screws and holes) with a snap-fit system using elastomeric material. The socket includes a resilient wall that can be deformed to insert the bulb holder and then returns to its original shape to secure the connection, eliminating the need for external fasteners and pre-drilled holes that could compromise plastic components.
Solution Approach 2:
The patent changes the mechanical properties of the socket by incorporating elastomeric material with specific durometer values (40-70 Shore A). This material property change allows the socket wall to be resilient enough to deform during assembly and then maintain a secure holding force, providing both secure attachment and protection against component damage.
2Strength
If traditional fastening methods with predrilled holes are used, then the shroud can be secured to the socket, but the number of parts and assembly time increase
Solution Approach 1:
The patent combines multiple functions into the elastomeric socket component: it serves as both the structural housing and the fastening mechanism. The bulb holder is integrated directly into the socket body, and the resilient wall provides both insertion guidance and securing force, eliminating the need for separate fasteners, holes, and alignment features.
Solution Approach 2:
The elastomeric socket performs self-alignment and self-securing functions. The resilient wall automatically deforms to accommodate the bulb holder insertion and then returns to its original shape to secure the connection, providing self-centering and self-locking capabilities that eliminate the need for precise pre-drilled holes or separate fastening operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies the assembly process, reduces the number of parts, and prevents damage to components, enabling efficient and cost-effective manufacturing of light strings by allowing quick fitting and locking of components without external fasteners.
Implementation Method 1
cooperating locking elements are positioned in the cap and on the neck to lock the cap to the neck
Data Source
AI summary
A light string with a snap-fit enclosure includes a conductor, a light element mounted to the conductor, a shroud having a body having an open interior and a neck, the neck having an opening therein, open to the body interior and a cap configured to fit onto the neck. Cooperating locking elements are positioned in the cap and on the neck to lock the cap to the neck, such that the cap is secured to the neck and the light element secured within the shroud without the need for an external fastener. At least one of the cap and the neck have at least two cut-outs formed therein opposing one another and defining a channel. The channel is configured to receive the conductor with the cap secured to the neck.