Chevron-Grooved Fastener Insert for Pullout and Rotation Resistance
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Solution Overview
Problem
Existing fastener inserts are expensive to manufacture and require complex processes, making them costly, while also facing challenges in providing sufficient resistance to pullout and rotation in assemblies.
Innovation Solution
A fastener insert with a chevron groove pattern on its exterior surface, made from inexpensive materials like steel, which can be efficiently manufactured using cold-forming techniques, providing enhanced resistance to pullout and rotation through its modified polygonal shape and chevron groove design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional fastener inserts are used, then manufacturing cost is high, but resistance to pullout and rotation is sufficient
Solution Approach 1:
The fastener insert employs a non-circular cross-section with asymmetric geometry, featuring a first portion and a second portion with different dimensions. This asymmetric design creates directional resistance to both pullout and rotation forces while enabling cost-effective manufacturing processes. The asymmetric shape allows the insert to engage differently with the anchor component, providing enhanced mechanical interlocking without requiring expensive materials or complex manufacturing.
Solution Approach 2:
The fastener insert design creates equipotential engagement surfaces that distribute mechanical loads uniformly across the interface with the anchor component. By optimizing the geometry of the first and second portions, the design ensures equal resistance to pullout forces from different directions and rotational moments, achieving reliable fastening performance at lower manufacturing cost through geometric optimization rather than material cost.
2Ease of manufacture
If fastener insert geometry is simplified, then manufacturing cost decreases, but resistance to rotation decreases
Solution Approach 1:
The non-circular asymmetric cross-section with distinct first and second portions provides inherent resistance to rotation without requiring complex manufacturing. The asymmetric geometry creates mechanical interference with the anchor component that resists rotational forces, while the design remains simple enough for cost-effective production. The rotation resistance arises from the geometric configuration rather than complex machining or expensive materials.
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 chevron groove pattern fastener insert offers significant resistance to both pullout and rotation, achieving performance comparable to expensive brass inserts but at a lower cost, with tensile-pull strength exceeding 2,500 Newtons, and can be manufactured using cost-effective materials and processes.
Implementation Method 1
The chevron groove pattern on the exterior surface provides resistance to pullout and rotation
Implementation Method 2
The chevron groove pattern on the exterior surface provides resistance to pullout and rotation
Data Source
AI summary
Disclosed is a fastener insert configured to join two components. The fastener insert includes an embeddable shank having an exterior surface and an axial opening. The embeddable shank can be inserted, embedded, and locked into a first component. The exterior surface defines a plurality of lobes extending around said embeddable shank. Each of the plurality of lobes has a leading edge. In some examples, a plurality of grooves of the exterior surface form a chevron groove pattern on each of the plurality of lobes.