Coaxial Cable Connector Gripping Ferrule Design
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Solution Overview
Problem
Conventional coaxial cable connectors require significant manual force and skill to install, often resulting in buckling and unsatisfactory connections, especially with smaller diameter cables, and struggle with sealing and gripping these cables effectively.
Innovation Solution
A coaxial cable connector design featuring a gripping ferrule with flexible fingers and internal ramps that compress radially inward to securely engage the cable, reducing installation force and steps required, while an annular post with a sharp edge facilitates cable preparation and a locking sleeve secures the cable within the connector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional coaxial connectors use a post with barbs to secure the cable, then mechanical attachment is achieved, but significant manual force is required and cable buckling occurs
Solution Approach 1:
The gripping ferrule changes the mechanical interaction from sharp barb penetration to gradual radial compression. The flexible fingers compress radially inward to grip the cable, transforming the force application method from high-force impact to distributed compression, thereby reducing peak force requirements while maintaining secure attachment
Solution Approach 2:
The gripping ferrule acts as an intermediary component between the connector body and the cable. It provides a compliant interface that grips the cable through radial compression of flexible fingers, mediating the force transmission and preventing direct high-force contact between the rigid post and the cable, thus avoiding buckling
2Reliability
If conventional connectors use a locking sleeve to secure the cable, then cable retention is improved, but the structure becomes more complex and difficult to assemble
Solution Approach 1:
The gripping ferrule combines multiple functions into a single component: it provides cable gripping through flexible fingers, enables sealing surfaces for environmental protection, and works with the locking sleeve for secure retention. This integration reduces the number of separate components needed while maintaining reliable cable retention
Solution Approach 2:
The gripping ferrule serves multiple purposes: it grips the cable outer jacket, provides a sealing surface against the locking sleeve, and facilitates cable insertion through its compliant structure. This multi-functionality reduces overall device complexity while improving reliability
3Adaptability or versatility
If conventional connectors are used with smaller diameter coaxial cables, then connectivity is achieved, but gripping and sealing become inadequate
Solution Approach 1:
The flexible fingers of the gripping ferrule can change their radial compression parameters to adapt to different cable diameters. The compliant structure allows the gripping force and sealing pressure to self-adjust based on the cable size, maintaining effective gripping and sealing across various cable dimensions without requiring different connector designs
4Reliability
If cable preparation involves multiple steps (stripping, folding, positioning), then proper electrical connection is achieved, but installation time increases
Solution Approach 1:
The gripping ferrule is pre-positioned within the connector body with flexible fingers ready to grip. The locking sleeve is pre-assembled with the ferrule, creating a pre-configured assembly that requires minimal field preparation. This preliminary assembly reduces on-site installation steps while ensuring proper electrical connections through the pre-positioned gripping and sealing surfaces
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 design significantly reduces the time and force needed for cable preparation, enhances gripping and sealing, especially for smaller diameter cables, preventing buckling and ensuring reliable electrical and mechanical connections.
Implementation Method 1
The gripping ferrule includes axially opposite gripping ends which move in a radially inward direction upon compression between the locking sleeve and the connector body to grip the outer surface of the cable
Implementation Method 2
The gripping ferrule preferably includes at least one flexible finger disposed at each opposite end of the ferrule, which deflects radially inward upon insertion of the locking sleeve into the connector body to grip a cable inserted into the connector
Implementation Method 3
The annular post has a rearward cable insertion end disposed within the connector body, which preferably defines a sharp edge adapted to penetrate an end of the cable as the gripping ferrule is threaded on the outer surface of the cable
Implementation Method 4
a locking sleeve movably coupled within the rearward cable receiving end of the connector body for locking the cable in the connector
Data Source
AI summary
A coaxial cable connector includes a connector body having a rearward cable receiving end, a locking sleeve movably coupled within the rearward cable receiving end of the connector body for locking the cable in the connector and a gripping ferrule disposed between the connector body and the locking sleeve. The gripping ferrule includes axially opposite gripping ends which move in a radially inward direction upon compression between the locking sleeve and the connector body to grip the outer surface of the cable.