Pre-attached Pulling Eyes for Wire Installation Efficiency
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Solution Overview
Problem
Existing wire and cable installation methods are labor-intensive and prone to errors, particularly in configuring pulling heads, which can lead to reduced maximum pulling tension and increased risk of damage to conduits and equipment.
Innovation Solution
Integrated systems that include pre-configured pulling eyes attached to wires or cables, allowing for standardized and efficient attachment of pulling ropes, reducing the need for on-site configuration and minimizing friction during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pre-configured pulling eyes are attached to all conductors, then pulling tension capacity and installation efficiency are improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
Pulling eyes are pre-attached to all conductors during manufacturing before delivery to the job site. This preliminary action eliminates the need for on-site configuration of pulling eyes, ensuring consistent attachment quality and reducing installation time. The pulling eyes are crimped or mechanically fastened to conductor ends in a controlled manufacturing environment, allowing for standardization and quality control.
Solution Approach 2:
The system is designed so that the pulling eyes automatically engage with the conduit system during installation without requiring additional configuration or adjustment by installers. The standardized pulling eyes are positioned and oriented during manufacturing to work seamlessly with the payoff reel and pulling mechanism, eliminating the need for on-site setup procedures.
2Loss of time
If pulling eyes are pre-attached during manufacturing, then installation time is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The attachment of pulling eyes to conductors is performed during the manufacturing process rather than at installation. This allows the pulling eyes to be integrated into the conductor assembly in a controlled environment where specialized equipment and procedures can be used, potentially reducing overall system complexity despite adding a manufacturing step.
Solution Approach 2:
The patent specifies particular parameters for the pulling eye attachment process, including crimping forces, attachment positions, and orientation angles. By standardizing these parameters during manufacturing, the process becomes repeatable and controllable, reducing the complexity burden. The pulling eyes are attached at specific locations along the conductor length with consistent orientation to ensure proper function during installation.
3Strength
If standardized pulling eyes are used on all conductors, then pulling tension capacity increases, but device complexity increases
Solution Approach 1:
The patent employs uniform pulling eyes with identical dimensions, materials, and attachment methods on all conductors within a cable assembly. This homogeneity ensures consistent pulling tension distribution across all conductors and simplifies the overall system design. The standardized pulling eyes have uniform eye hole sizes, crimping specifications, and material properties, eliminating variability that would increase system complexity.
Solution Approach 2:
The pulling eyes are designed as universal components that can be used on all types of conductors in the system, regardless of conductor size or type. This universal design approach allows a single pulling eye specification to serve multiple functions across different conductor applications, reducing the number of unique components needed and thereby reducing overall system complexity while maintaining high pulling tension capacity.
Data Source
AI summary
Pulling eyes are provided with integrated wiring systems suitable for installing conductors or cables. The pulling eyes may include body portions that define interior cavities that are sized to snugly engage outside portions of the conductors or cables. The body portions are sized to be deformably crimped onto the outside portions of the conductors or cables. The pulling eyes may also include head portions joined to the body portions, with the head portions defining apertures for receiving a strength member for installing the conductors or cables. These apertures place the interior cavities in communication with the exteriors of the pulling eyes.