Preconnectorized Fiber Optic Cable Assembly with Integrated Strain Relief
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Solution Overview
Problem
Existing fiber-optic cable termination systems require multiple components for secure connection and strain relief, often failing to ensure proper sealing and preventing axial and rotational movement, which can compromise data transmission and durability.
Innovation Solution
A metal crimp member is mechanically deformed to form tabs or ears that engage with a two-piece clamp housing for axial and rotational fixation, combined with an elastic member for retention, and a gauge for precise assembly, ensuring secure strain relief and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple individual components are used to terminate a connector on a drop cable, then the connection can be securely formed, but the device complexity and number of components increases
Solution Approach 1:
The patent combines multiple individual components (crimp member, clamp housing, strain relief, sealing elements) into an integrated pre-connectorized cable assembly. The clamp housing integrates strain relief, sealing, and positioning functions, while the crimp member integrates mechanical attachment and alignment features, reducing the total component count while maintaining connection security
Solution Approach 2:
The clamp housing serves multiple functions simultaneously: it provides strain relief by gripping the cable jacket, prevents axial movement through engagement with the crimp member, prevents rotational movement through asymmetric features, and provides sealing to protect the optical tip. This multi-functionality reduces the need for separate components for each function
2Reliability
If a dust cap is tethered to the assembly and selectively received on the optical tip, then the optical tip is protected when not in use, but the device complexity increases
Solution Approach 1:
The dust cap is designed as a flexible, lightweight protective cover that can be easily attached and removed. The tether connects the dust cap to the assembly through the connector body, allowing simple manual operation without complex mechanisms. The flexible material allows the cap to conform to the optical tip shape while providing effective protection
3Reliability
If adequate strain relief is provided to transmit forces to the cable jacket, then the fiber is protected from damage, but the clamp housing and crimp member design becomes more complex
Solution Approach 1:
The strain relief function is segmented into distinct components: the crimp member provides initial mechanical attachment and force distribution to the cable jacket, while the clamp housing provides additional strain relief and positioning. This segmentation allows each component to be optimized for its specific function without excessive complexity
Solution Approach 2:
The crimp member is pre-formed with ears or tabs that extend radially outward to engage with the clamp housing. This preliminary configuration allows the clamp housing to be simply snap-fit over the crimp member, automatically establishing the strain relief connection without requiring complex assembly operations
4Reliability
If the clamp housing prevents both axial and rotational movement, then the connector positioning is stabilized, but the clamp housing design becomes more complex
Solution Approach 1:
The clamp housing incorporates asymmetric features such as a keyway or asymmetric recess that engages with a corresponding asymmetric feature on the crimp member. This asymmetric engagement prevents rotational movement of the connector while maintaining a relatively simple clamp housing design. The asymmetry provides inherent anti-rotation without requiring complex locking mechanisms
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 solution provides enhanced strain relief and sealing, preventing movement and moisture intrusion, thereby ensuring reliable data transmission and improved durability of fiber-optic cable assemblies.
Implementation Method 1
An elastic member, such as a flexible o-ring, is used in one embodiment to retain first and second clamp housing portions together
Implementation Method 2
a metal crimp member is received over the outer surface of the cable jacket, and subsequently mechanically deformed or crimped into a desired configuration
Data Source
AI summary
A fiber optic cable assembly or termination system is preconnectorized and may include different combinations of collars, crimp bands, and clamp assemblies to improve functionality of the arrangement.