Segmented Nut Sleeve Release for Corrosion-Prone Fasteners
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Solution Overview
Problem
Conventional segmented nuts face challenges in quick release due to binding, corrosion, and difficulty in applying axial forces, especially in corrosive environments, leading to safety concerns and the need for oxyacetylene cutting, which is often banned.
Innovation Solution
A segmented nut design with at least two sections and a movable sleeve that rotates or moves axially to release the nut sections radially, using a polygonal interface to distribute force and prevent torque-induced rotation, allowing for easy disassembly without thread engagement, and optionally incorporating anti-rotation devices like nylon inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional segmented nuts use thin webs to connect pieces for easy breaking, then quick removal is enabled, but the strength to maintain the nut in position during use is compromised
Solution Approach 1:
The nut is divided into multiple circumferential segments that can be separated radially. The segmentation allows the nut to be easily disassembled by moving segments radially outward, enabling quick removal without cutting while maintaining structural integrity during fastening through the interconnected segment design.
Solution Approach 2:
The nut transitions from a static locked state to a dynamic release state through radial movement of segments. The segments are designed to be stable during tightening but can be easily separated radially when release is needed, providing dynamic adaptability between fastening and removal phases.
2Strength
If clamping screws are used to hold segments together, then segments are forced together securely, but the screws can corrode or seize within the collar and require additional dexterity to remove
Solution Approach 1:
The clamping screws are extracted from the collar structure and replaced with an alternative mechanism. The collar is designed to allow direct radial movement of segments without requiring screw removal, eliminating the corrosion and seizing problems associated with threaded fasteners in confined spaces.
Solution Approach 2:
The collar acts as an intermediary structure that provides a smooth bore for the bolt while allowing radial movement of segments. It replaces the function of clamping screws through its structural design, enabling segment separation without threaded fasteners that can corrode or seize.
3Ease of operation
If an axially moveable collar is used to release nut pieces, then the collar can be slid to release segments, but sufficient purchase on the sleeve to provide axial force is difficult to achieve and applying axial forces in confined spaces is difficult
Solution Approach 1:
The release mechanism transitions from axial movement to radial movement. Instead of sliding the collar axially to release segments, the segments are designed to move radially outward from the collar, utilizing a different dimensional approach that is easier to apply force to in confined spaces.
Solution Approach 2:
The release mechanism is inverted from the conventional axial sliding approach. Rather than moving the collar axially to release segments, the segments are designed to be pushed radially outward from the collar, reversing the direction of force application to a more practical radial vector.
4Ease of operation
If conventional nuts are cut away for removal, then removal is achieved, but the process is time consuming and raises significant safety concerns
Solution Approach 1:
The nut is pre-segmented into multiple circumferential pieces that can be easily separated. This segmentation eliminates the need for cutting during removal, as segments can simply be pushed radially outward and detached from the bolt, dramatically reducing removal time and eliminating safety hazards associated with cutting operations.
Solution Approach 2:
The segmented nut design accepts that the fastening component may be single-use or easily replaceable. By designing for easy radial separation rather than durable permanent retention, the system enables quick disposal or replacement of segments without expensive or dangerous removal procedures.
Data Source
AI summary
A segmented nut is formed by three segments held together with a sleeve for transport and fastening use. Rotation of the sleeve, such as in the order of 60°, frees the segments, allowing for quick release of the nut.