Two-Piece Tie Down Clip Wedge Design
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Solution Overview
Problem
Existing methods for securing tarps and sheet materials often damage the material, whether through grommets that rip out, piercing clips, or adhesives that lose their hold over time, and there is a need for a secure, easy-to-install clip that provides a strong, long-lasting grip without tearing the material.
Innovation Solution
A two-piece clip system featuring a triple tapered wedge and groove design made of synthetic nylon, allowing for a tight friction fit on a sheet with a reinforcing fiber grid, enabling easy installation and release, and featuring a raised loop for easy rope or cord insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grommets are used to secure tarps, then the tarp can be held in position, but the grommets often rip out of the tarp causing damage
Solution Approach 1:
The clip is divided into two separate pieces: a U-shaped body with an angled cavity and a separate wedge element. This segmentation allows the wedge to be inserted and removed independently, providing secure holding without permanent damage to the tarp material.
Solution Approach 2:
The wedge acts as an intermediary between the U-shaped body and the tarp material. By inserting the wedge into the angled cavity, it creates friction-based holding force against the tarp without directly piercing or damaging the material, thus mediating between the need for secure attachment and material preservation.
2Reliability
If piercing clips are used to attach to sheet material, then secure attachment is achieved, but the material is damaged or torn
Solution Approach 1:
The harmful piercing function is extracted from the attachment mechanism. Instead of piercing the material, the clip uses a friction-based wedge system that holds the tarp through surface contact and mechanical interlocking, completely removing the damage-causing piercing action while maintaining secure attachment.
Solution Approach 2:
The design converts the potential harm of direct material contact into benefit by using friction between the wedge and tarp, and between the U-shaped body and tarp, to create secure holding force without penetration or damage. The friction that could cause wear is instead harnessed as the primary holding mechanism.
3Reliability
If adhesives are used to secure sheet material, then attachment is achieved, but they lose their holding ability over time
Solution Approach 1:
The clip uses a dynamic mechanical wedge system rather than static adhesive bonding. The wedge can be inserted, adjusted, and removed, creating active friction-based holding that maintains its effectiveness over time through mechanical force rather than degrading chemical bonding.
Solution Approach 2:
The wedge design allows the user to self-adjust and reposition the clip as needed. The friction-based holding mechanism automatically maintains its grip through the mechanical interference fit between the wedge and U-shaped body, requiring no external maintenance or curing time like adhesives.
4Reliability
If a tight friction fit is used to bind sheet material, then secure grip is achieved, but installation difficulty increases
Solution Approach 1:
The wedge and U-shaped body have asymmetric angled surfaces that guide insertion. The angled cavity in the U-shaped body matches the complementary angle of the wedge, creating a self-aligning system that naturally guides the wedge into the correct position, reducing installation difficulty while maintaining tight friction fit.
Solution Approach 2:
The angled surfaces of the wedge and U-shaped body create a tapered, curved insertion path that facilitates easy insertion through gradual engagement. The curved geometry allows the components to slide into each other smoothly, reducing friction during installation while maintaining the tight friction fit once assembled.
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
The clip provides a strong, long-lasting grip on the material without damaging it, resisting weathering and securely holding the sheet in place with a wide and long wedge and groove configuration that binds multiple reinforcing fibers, ensuring easy installation and release.
Implementation Method 1
The first wedge member can slide into the second groove member with the flexible sheet clamped between by binding the sheet in a tight friction fit
Data Source
AI summary
A two-piece clip for tying down a sheet of material has an elongated triple tapered wedge insertable in a mating triple tapered groove. The two components bind the covering material therebetween with a tight friction fit and compress a relatively large area of material, especially plastic material with a built-in reinforcing fiber grid. The clip binds a large number of rows and columns of reinforcing elements of a plastic cover sheet in a tight friction fit therebetween for a secure grip and easy release without damaging the material.