Aerial Sheave Device with Composite Cage and Segmented Floor
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Solution Overview
Problem
The installation of suspended cables, particularly fragile fiber optic cables, is challenging due to damage from excessive pressure, sharp bends, and uneven sheave surfaces, and poses risks from electrical currents. Existing sheaves are not designed to handle fragile cables safely and efficiently, and there is a need for a lightweight, durable, and non-conductive solution that minimizes damage during installation.
Innovation Solution
A lightweight, durable aerial sheave device made from non-conductive materials like plastic, featuring a pulley wheel with a U-shaped profile and a locking guard that prevents cable slippage and damage, along with a swivel-loop attachment for flexible installation around corners, and a latch system to secure the cable, ensuring safe and efficient suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal sheaves are used for cable installation, then strength and durability are improved, but electrical conductivity creates safety hazards and plastic materials create peaks and valleys that damage fragile cables
Solution Approach 1:
The sheave is constructed from composite materials: a plastic body (acetal, nylon, or polyethylene) for electrical insulation, reinforced with an embedded metal cage structure (steel or aluminum wires formed into a cylindrical cage) for mechanical strength. This composite construction provides both durability and electrical non-conductivity, resolving the contradiction between strength and electrical safety.
2Ease of manufacture
If plastic sheaves are made with spokes supporting the floor from the hub, then manufacturing is simplified, but shrinkage during curing creates peaks and valleys that damage fragile cables
Solution Approach 1:
The sheave floor is segmented into multiple independent sections or segments rather than a single continuous surface. These segments are arranged radially around the hub, allowing each segment to shrink independently during curing without creating peaks and valleys. The segmentation eliminates the manufacturing precision problem while maintaining ease of fabrication.
3Ease of operation
If cable is allowed to move freely during installation, then installation flexibility is improved, but cable may slip off the sheave or become caught causing damage
Solution Approach 1:
The sheave incorporates a dynamic cable retention system with movable retaining edges that can pivot or adjust their position. During cable installation, the retaining edges remain open or flexible to allow easy cable placement and movement. Once the cable is in position, the retaining edges close or lock to securely hold the cable, preventing slippage or entanglement. This dynamic adjustment resolves the contradiction between installation flexibility and cable retention reliability.
Data Source
AI summary
Disclosed is an aerial sheave device for the installation and suspension of cable. The aerial sheave device includes a frame and a rotating wheel that coordinates with a locking cable guard. The device also includes a lockable side latch for affording access to the wheel area. The frame may be attached to a utility pole via a loop attached to the frame. The loop attaches to the frame via dome-inside-a-dome connection which allows the frame to also rotate 360 degrees. The dome-inside-a-dome connection includes a solid semispherical dome attached to the loop which fits inside a slightly larger semispherical dome shaped cavity of the frame.