Blind Bolt Pin Tapered Tip Vibrational Locking
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Solution Overview
Problem
Existing fasteners, such as blind bolts, fail to securely hold components together under vibrational forces and environmental stress, particularly in restricted access scenarios like hollow box sections, where they lack the necessary holding power and durability.
Innovation Solution
A blind bolt assembly featuring a pin with an outwardly and inwardly tapered tip and a bolt with a longitudinal bore, feet, and a rebate, where the pin's strike portion engages the bolt's shoulder, allowing the fastener to lock components together even after tightening, enhancing holding power and resistance to vibrational forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional blind bolt is used to secure components in restricted access scenarios, then the fastener can be installed, but it lacks sufficient holding power and fails under vibrational forces
Solution Approach 1:
The pin is segmented into distinct functional regions: a strike portion for installation, a shaft for penetration, and a tip region with tapered surfaces for locking. The bolt is segmented into a bore for pin reception and an outer threaded portion for securing. This segmentation allows each part to perform its specific function optimally, with the pin's tapered tip region specifically designed to resist vibrational forces through mechanical interlocking.
Solution Approach 2:
The pin's tip region features tapered surfaces that create a dynamic locking mechanism. When the pin is inserted, the tapered surfaces engage with corresponding features in the bolt, creating a self-locking action that dynamically responds to applied loads and vibrational forces, maintaining holding power under varying conditions.
2Reliability
If the pin's tip region includes both outwardly and inwardly tapered surfaces, then the fastener achieves enhanced locking action, but the manufacturing complexity increases
Solution Approach 1:
The outwardly tapered surface and inwardly tapered surface are merged into a single integrated tip region of the pin. This combined structure achieves enhanced locking action through the interaction of both tapered surfaces with corresponding features in the bolt, while being manufactured as one continuous feature rather than separate components, thus reducing overall manufacturing complexity.
3Ease of operation
If the strike portion has a greater cross sectional area than the shaft, then the pin can be properly struck during installation, but the transition region becomes more complex
Solution Approach 1:
The pin exhibits local quality variation along its length, with the strike portion having a greater cross-sectional area than the shaft. This localized difference in geometry is specifically positioned at the end subjected to impact forces during installation, allowing proper strike capability where needed while maintaining a simpler, smaller cross-section in the shaft region for easier insertion and reduced material usage.
Data Source
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AI summary
A pin for a blind bolt, the pin having a proximal end, a distal end and a shaft between the proximal and distal ends, extending axially from the distal end an outwardly tapered surface and an inwardly tapered surface, the pin comprising a strike portion at the proximal end, wherein the cross sectional area of the strike portion is greater than the cross sectional area of the shaft.