Silo Fall Arrest System with Transition Pulley
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Solution Overview
Problem
Existing fall arrest systems for agricultural silos require users to switch between safety systems when navigating non-linear paths, which can be inconvenient and leave users unprotected at certain points, especially when the path involves a substantial vertical and inclined slope.
Innovation Solution
A continuous fall arrest system with a safety cable supported independently of the ladder, featuring a collar at the top of the silo, a pulley at the transition from vertical to inclined sides, a shock absorber, and a resilient device to maintain tension, ensuring user protection throughout the ladder's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the safety cable is integrated with the ladder, then the device complexity is reduced, but the reliability of continuous protection is compromised at non-linear path transitions
Solution Approach 1:
The safety cable system is segmented into multiple support points (top mount, pulley at transition, base securing) rather than a single integrated ladder connection. This segmentation allows the cable to maintain continuous protection across non-linear path transitions while distributing structural loads independently from the ladder.
Solution Approach 2:
A pulley is introduced as an intermediary component at the transition point between vertical and inclined sections. This pulley mediates the cable's path, allowing it to navigate the non-linear geometry while maintaining tension and continuous protection without requiring direct integration with the ladder structure.
2Reliability
If the safety cable follows the ladder structure, then the ease of operation is improved, but the reliability of protection at vertical to inclined transitions is compromised
Solution Approach 1:
The safety cable system transitions from a two-dimensional ladder-integrated path to a three-dimensional spatial configuration. The cable extends independently through space, supported at key points (top, transition pulley, base), allowing it to follow the non-linear path geometry while maintaining continuous protection without constraining user movement along the ladder.
3Reliability
If the safety cable is supported independently of the ladder, then the reliability of continuous protection is improved, but the device complexity increases
Solution Approach 1:
Independent support structures are implemented only at critical locations (top mount, transition pulley, base securing) rather than along the entire cable length. This local quality approach provides continuous protection where most needed while minimizing the overall complexity of the support structure.
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
Provides continuous user protection by maintaining the safety cable's integrity and tension across the silo's vertical and inclined sections, enhancing safety and convenience by eliminating the need for system changes.
Implementation Method 1
Preferably including a shock absorber connected between the collar and the top end of safety cable
Implementation Method 2
Preferably including a resilient device between the bottom end of the safety cable and the securing means. Preferably the resilient member is a spring
Data Source
AI summary
A fall arrest system for a silo having a ladder is described. Silos typically have a slopping top and substantially vertical sides. Typically, multiple independent fail arrest systems are used, one for the sloping top and one for the vertical sides. The single fall arrest system described includes: a safety cable, having a top end and a bottom end, to which in use a user connects to; a collar for fitting at the top of the silo, around the neck of the silo to which the top end of safety cable is attached; a pulley at the transition of the slopping top and substantially vertical sides, wherein the pulley supports the safety cable at the transition; and securing means for securing the bottom of the safety cable at the base of the silo.