Deformable Fastening Collar for Threadless Multi-Layer Joints
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Solution Overview
Problem
The installation of threaded fasteners into multi-layer structures is challenging due to the need for precise alignment of threads and torque control, which can lead to cross-threading and improper securing, requiring additional time and tools, and may result in damage or failure of the structural joint.
Innovation Solution
A multi-piece fastening system comprising a fastening collar with a first region for receiving a bore, a second region for engaging an installation tool, and a cavity for receiving a shank, where the elongate portion deforms onto the shank upon forcible contact, allowing for secure installation without the need for threaded bores and enabling rotation of adjacent layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threaded fasteners are used to secure structural components, then the structural joint strength is improved, but the installation complexity and risk of cross-threading increases
Solution Approach 1:
The patent removes the threaded portion from the fastening system entirely. Instead of using threaded fasteners that require precise alignment and torque control, the invention uses a smooth-shanked fastener combined with a collar that deforms onto the shank to create the fastening action. This extraction of the threading element eliminates cross-threading risks while maintaining joint strength through deformation-based fastening.
Solution Approach 2:
The patent changes the fastening mechanism from thread-based mechanical engagement to deformation-based engagement. The collar is designed to deform radially inward when forced onto the shank, creating a secure fit without requiring threads. This parameter change from threaded geometry to smooth deformation geometry simplifies installation while maintaining structural integrity.
2Strength
If threaded fasteners are used to secure structural components, then the structural joint strength is improved, but the installation time and additional tools required increases
Solution Approach 1:
By removing the threading mechanism entirely, the patent eliminates the time-consuming processes of thread alignment, gradual tightening, and torque control. The smooth-shanked fastener with deformable collar can be installed in a single motion, significantly reducing installation time while maintaining joint strength through the deformation fastening action.
Solution Approach 2:
The invention allows the installer to skip the gradual threading process and go directly to the final fastening position. The collar is forced onto the shank in one decisive action, rushing through the installation process without the need for incremental tightening steps required by threaded fasteners.
3Strength
If threaded fasteners are used to secure structural components, then the structural joint strength is improved, but the risk of damage or failure due to improper installation increases
Solution Approach 1:
By extracting the threading element from the system, the patent eliminates the primary sources of installation error: cross-threading, thread stripping, and improper torque application. The smooth-shanked fastener with deformable collar provides a foolproof installation that cannot be done incorrectly, significantly improving reliability while maintaining joint strength.
Solution Approach 2:
The collar design incorporates self-aligning features that guide it onto the shank automatically during installation. The deformation process is self-regulating, with the collar naturally conforming to the shank dimensions without requiring precise alignment or controlled application of force, making the installation process inherently reliable.
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 solution simplifies the installation process, increases the reliability of structural joints, eliminates the need for threaded bores, and allows for a broader range of applications, including lockbolts and blind fasteners, by ensuring secure fastening while enabling rotation of adjacent layers.
Implementation Method 1
the elongate portion is configured to at least partially deform onto the shank responsive to forcible contact between the second region and an installation tool
Data Source
AI summary
Fastening collars, multi-piece fastening systems, and methods of fastening are provided. The fastening collar comprises a first end, a second end, and an elongate portion intermediate the first end and the second end and defining a longitudinal axis of the fastening collar. The elongate portion comprises a first region adjacent the first end, a second region intermediate the first region and the second end, and a cavity. The first region comprises a first diameter and is configured to be received by a bore of a structure. The second region comprises a second diameter greater than the first diameter. The cavity extends through the elongate portion and is configured to receive at least a portion of a shank of the multi-piece fastening system. The elongate portion is configured to at least partially deform onto the shank responsive to forcible contact between the second region and an installation tool.