Cable Loop Forming Device for Single-Operator Lifeline Installation
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Solution Overview
Problem
The installation of lifelines at altitude is complex and requires two operators due to the difficulty in determining the precise length of cable needed between loops, making it hazardous and inefficient, especially when only one person is available to set it up, as it necessitates back-and-forth movement between fixed points and involves numerous tools that can be lost or fallen.
Innovation Solution
A semi-automatic device for shaping a loop on a cable, featuring a gutter with a winding cam and rotatable cable passage that folds the cable back on itself to form a loop, allowing for single-handed operation with minimal tools, including a gripping mechanism and clamping system to secure the loop in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional loop shaping methods are used, then loops can be formed on the cable, but the installation requires two operators and multiple tools, increasing complexity and safety risks
Solution Approach 1:
The patent combines multiple functions (loop formation, cable tensioning, and securing) into a single integrated device. The device includes a forming element that creates the loop, a tensioning element that applies pre-tensioning, and a securing mechanism with cable ties, all operated by one person from a single position without requiring back-and-forth movement between fixed points.
Solution Approach 2:
The device performs multiple operations simultaneously: it forms the loop on the cable, applies the necessary pre-tensioning, and secures the loop with cable ties. This multi-functional approach eliminates the need for separate tools and operators for each step of the installation process.
2Reliability
If an operator performs installation alone, then tool loss and falling risks are reduced, but the operator must move between fixed points which is dangerous
Solution Approach 1:
The device is designed to be self-contained and self-operating. The single operator can perform all installation functions (loop formation, tensioning, and securing) from one position using the integrated device, eliminating the need to move between fixed points and reducing safety risks associated with tool handling and transport.
3Stability of the object's composition
If cable clamps are used during conventional loop shaping, then the loop can be secured, but the clamps block carabiner passage and create neutralized cable length
Solution Approach 1:
Instead of using a single clamping mechanism that blocks the cable, the device uses multiple cable ties that can be positioned and adjusted independently. This segmented approach allows the loop to be securely fastened while maintaining cable continuity and minimizing the neutralized length, preserving more usable cable for carabiner attachment.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The device has a gutter guiding a cable and comprising a front part (40a) and a rear part (40b). A cam (41) is set above the front part, such that the cable extends in the gutter and beneath the cam. A folding unit formed of the cam, connecting rods (43a, 43b) and a spacer (44) folds the cable towards the rear and has a cable passage mobile in rotation around the cam between one position in which the passage is aligned with the gutter, and another position in which the cable extends inside the gutter, across the passage and is folded on itself. Hooks maintain the cable in folded position.