Fiberglass Hole Plug for Electrical Enclosures
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Solution Overview
Problem
Existing hole plugs for electrical enclosures face challenges in achieving consistent sealing when hand tightened, leading to potential leaks due to inconsistent torque application, especially in hard-to-reach locations and varying user strength, which can compromise the enclosure's integrity by allowing water and dust ingress.
Innovation Solution
A fiberglass hole plug design with a reduced radial lip surface and a gasket for enhanced sealing, allowing for improved sealing capabilities when hand tightened, utilizing a fiberglass reinforced thermoset molding compound and a fastener that adjusts longitudinally to secure against the panel wall, along with an optional spacer for snug fit, ensuring a consistent seal without the need for custom torque tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional hole plug with a larger radial lip surface is used, then the structural strength and material durability are improved, but the sealing performance deteriorates when hand tightened due to inconsistent torque application
Solution Approach 1:
The patent applies local quality by reducing the radial lip surface distance specifically at the sealing interface (to 0.25 inches or less) while maintaining the overall structural integrity of the hole plug. This localized modification allows the seal to engage more effectively with the panel wall even when hand-tightened, without compromising the overall strength of the component.
Solution Approach 2:
The patent changes the geometric parameter of the radial lip surface distance from the peripheral edge of the cover to the threaded member (reducing it to 0.25 inches or less). This parameter change optimizes the sealing contact area and pressure distribution, enabling reliable sealing under variable hand-tightening conditions while preserving structural strength.
2Ease of operation
If vinyl adhesive-backed dots are used to cover openings, then the installation ease is improved, but the durability in corrosive or harsh outdoor environments deteriorates
Solution Approach 1:
The patent uses a composite material construction with a fiberglass-reinforced thermoset molding compound for the cover and threaded member, combined with a separate fastener component. This composite approach provides both the durability needed for harsh environments and a threaded fastening mechanism that maintains ease of installation while resisting corrosion and UV degradation.
3Reliability
If stainless steel or zinc plated carbon steel hole plugs are used, then the durability in corrosive environments is improved, but the manufacturing cost deteriorates
Solution Approach 1:
The patent employs a fiberglass-reinforced thermoset molding compound that provides corrosion and UV resistance comparable to metal materials but at lower cost. The composite material structure delivers the required durability in harsh environments while being more economical to manufacture than stainless steel or zinc-plated carbon steel alternatives.
4Reliability
If the radial lip surface distance is reduced to improve sealing, then the sealing performance is improved, but the structural leverage for hand tightening deteriorates
Solution Approach 1:
The patent segments the hole plug into distinct functional components: a cover with reduced radial lip surface for sealing, a threaded member for fastening, and a separate fastener. This segmentation allows the sealing surface to be optimized independently from the fastening mechanism, enabling effective hand-tightening through the threaded fastener while maintaining superior sealing performance.
Data Source
AI summary
A fiberglass hole plug for sealing unused openings in electrical enclosures is disclosed. The hole plug includes a cover having a first side and a second side and defining a peripheral edge and a threaded member having a first end and a second end. The second end of the threaded member is attached to the second side of the cover, axially extends in a direction away from the cover, wherein a radial distance between the threaded member and the peripheral edge on the second side of said cover is less than or equal to one-half inch. The hole plug further includes a fastener threadably attached to the threaded member, whereby rotation of the fastener adjusts a longitudinal distance between the first end and the second end of the threaded member.