Dynamic Sleeve Insert for Blind Fastener Anti-Rotation
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Solution Overview
Problem
Conventional blind fastening systems restrict relative shear movement between work pieces due to their close fit relationship, preventing lateral movement and potentially leading to work piece deformation or fastening system failure.
Innovation Solution
A blind fastener system incorporating a dynamic sleeve insert with a two-part anti-rotation mechanism and partial lateral translation constraining means, allowing for off-center assembly and constrained shear movement between work pieces without causing deformation or system failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a close fit relationship is used between the collet body and sleeve insert to prevent rotation and translation, then anti-rotation and anti-translation are improved, but lateral movement between work pieces is restricted
Solution Approach 1:
The anti-rotation and anti-translation means are divided into two separate parts: one part on the collet body and another part on the sleeve insert. This segmentation allows the close fit relationship to provide rotational and translational stability while the separated anti-rotation features enable lateral movement capability, resolving the contradiction between stability and adaptability.
2Stability of the object's composition
If complete rotation prevention is implemented between the collet body and sleeve insert, then fastening system stability is improved, but off-center assembly and shear movement are prevented
Solution Approach 1:
The anti-rotation means employs asymmetric geometric features (such as non-circular cross-sections or keyed interfaces) that prevent complete 360-degree rotation while allowing controlled partial rotation or off-center positioning. This asymmetric design enables both fastening system stability and off-center assembly capability to coexist.
Data Source
Figure 1~4C
Figure 5~7C
Figure 8A~9B
AI summary
This invention is to provide methods, articles and systems for associating, preferably compressively or closely in stacked fashion, at least two work pieces, each work piece defining a bore or hole for receiving an invention embodiment, in combination with a blind fastener component or system comprising a first part of a first two part anti-rotation means.