Channel Letter Trim Cap Retainer Clip Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing channel letter signage assemblies require labor-intensive and aesthetically displeasing screw attachment for retaining the trim cap and lens, and lack a convenient method for disassembly, which can lead to issues like rust, cracking, and difficulty in servicing.
Innovation Solution
A retainer clip system using u-shaped rigid bodies with angled barbs and legs that securely attach the trim cap to the enclosure without screws, allowing for easy installation and one-handed removal, providing a water-resistant seal and facilitating maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws are used to attach the trim cap to the enclosure, then the lens is securely retained, but the installation becomes labor-intensive and the appearance becomes aesthetically displeasing
Solution Approach 1:
The patent removes the screw fastening system from the assembly, extracting the harmful element (screws) that cause aesthetic degradation and installation complexity. The trim cap is redesigned with integrated retention features that eliminate the need for separate fastening components.
Solution Approach 2:
The trim cap incorporates self-retaining features including bent legs and engagement elements that automatically secure the cap to the enclosure without external fasteners. The structure serves its own fastening function, eliminating the need for screws and simplifying installation.
2Strength
If screws are used to retain the trim cap and lens, then the assembly is secure, but disassembly becomes difficult and time-consuming
Solution Approach 1:
The retention system incorporates flexible bent legs that can elastically deform during installation and removal. The legs bend inward to allow easy insertion and removal of the trim cap, then spring outward to provide secure retention during service, enabling dynamic adjustment between installation and retention states.
Solution Approach 2:
The trim cap is divided into separate functional segments including the main body, bent legs, and engagement elements. This segmentation allows the cap to be easily removed as a single unit for maintenance while maintaining secure attachment during operation.
3Reliability
If traditional screw attachment is used, then the lens is retained, but rust and cracking can occur over time
Solution Approach 1:
The patent eliminates metal-to-metal fastening connections that are prone to rust and cracking. By removing screws and using alternative retention methods such as bent legs and friction-based engagement, the system eliminates the harmful factor of corrosion and stress concentration at fastener holes.
Solution Approach 2:
The trim cap system utilizes composite construction combining different materials with complementary properties. The bent legs and engagement elements are designed to work together as an integrated system that distributes stress evenly, preventing the localized stress concentration that leads to cracking in screw-based assemblies.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A channel letter has a rear surface for mounting against a raceway, wall, or a structure for supporting the signage, and sheet metal sides defining the figuration of the letter or shape to be depicted. A lighting element is positioned against the rear surface of the enclosure, and a lens is retained to the open front of the enclosure. The lens is secured with a retainer cap and a plurality of retainer clips. Each of the retainer clips comprises as least one side including an outwardly extending leg for retention with the retainer cap, and may include one or more of a rivet or piece of double-sided tape for securing each of the retainer clips, a spring biased portion engaging the lens, and a J-hook forward edge for engaging the lens.