Segmented Shape Memory Attachment Ring for Cable Shield
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Solution Overview
Problem
Existing attachment rings for electrical cables are time-consuming and difficult to position over the shield end, and their removal can be costly and damaging due to their strong shape memory materials, especially when the shield diameter exceeds expected dimensions.
Innovation Solution
An attachment ring with discrete segments made of heat-recoverable shape memory material, allowing for side-entry assembly over the shield after it is already attached to the backshell fitting, and easy removal without special tools by breaking the interlocking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-piece continuous attachment ring is used, then the attachment ring can be positioned over the shield end before the shield is received over the fitting, but this process is time-consuming and difficult, increasing termination cost and decreasing productivity
Solution Approach 1:
The attachment ring is divided into multiple discrete segments that can be independently positioned and assembled. This segmentation allows the segments to be placed around the shield end after it has been received over the fitting, eliminating the need to position a continuous ring beforehand and significantly reducing termination time and difficulty.
2Strength
If a one-piece continuous attachment ring is used, then the ring can hold the shield end securely, but removal requires cutting which is difficult, time-consuming, and may damage the cable or backshell
Solution Approach 1:
The attachment ring consists of multiple discrete segments that can be independently removed from the shield end. This segmentation allows for easy removal without cutting, as each segment can be individually detached, eliminating the risk of damage to the cable or backshell while maintaining secure holding strength during use.
Solution Approach 2:
The attachment ring segments are designed to be removable and potentially reusable. After serving their function of securing the shield end, the segments can be easily detached and recovered for potential reuse on other cable terminations, reducing waste and cost.
3Strength
If the attachment ring is made of strong shape memory material, then the ring can reliably hold the shield on the fitting, but removal becomes difficult and may require special tooling
Solution Approach 1:
By dividing the attachment ring into discrete segments, the strong shape memory material provides reliable holding strength during operation, but removal is simplified because each segment can be individually detached without requiring special cutting tools or complex removal procedures.
4Reliability
If a one-piece attachment ring is used, then the ring provides continuous engagement around the shield, but positioning it after the shield is received over the fitting requires moving it along the entire cable length, which is time-consuming and may require the other end to be unterminated
Solution Approach 1:
The discrete segments can be independently positioned around the shield end after it has been received over the fitting, eliminating the need to move a continuous ring along the entire cable length. This segmentation allows for direct positioning at the termination point without requiring the other end of the cable to be unterminated, significantly reducing positioning time.
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
Facilitates faster and easier attachment and detachment of the shield to the backshell, reducing termination time and costs, and preventing damage to the cable and backshell during removal.
Implementation Method 1
Heat is then applied externally by a heat source or generated by the application of current to the attachment ring. The heat applied to the attachment ring recovers, e.g., shrinks, the attachment ring into engagement with the end of the shield.
Implementation Method 2
The heat applied to the attachment ring recovers, e.g., shrinks, the attachment ring into engagement with the end of the shield.
Data Source
AI summary
An attachment ring (16) is provided for attaching a shield (18) of an electrical cable (12) to a backshell (14). The attachment ring includes an annular body (26) including a shape memory material that is heat recoverable. The body is configured to extend at least partially around the shield and a fitting (24) of the backshell to hold the shield on the fitting in contact with the fitting. The body includes a first segment (28) including an end (50) having a connection member (58a). The body also includes a second segment (30) that is discrete from the first segment. The second segment includes an end (54) having a connection feature (60a). The connection feature of the second segment is interlocked with the connection member of the first segment to connect the first and second segments together at the ends such that the first and second segments define at least a portion of a length of the body.