Telescoping Mast Safety Latch for Cable Failure
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Solution Overview
Problem
Portable light towers with telescoping masts face safety risks due to frequent cable failures during elevation and lowering, which can result in catastrophic collapses, especially when operators are nearby, as existing safety mechanisms like clevis pins are often misplaced or improperly installed, and hydraulic systems provide inadequate safety in case of failures.
Innovation Solution
An automatic spring-loaded safety latch assembly is integrated into the mast system, which engages the first hoisting cable with a latch mechanism, ensuring the mast is caught and held in place within a fraction of a second if the cable fails, eliminating the need for manual intervention or specific alignment of safety pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a wire cable and winch assembly is used to extend and retract the mast, then the device complexity is reduced and ease of operation is improved, but the reliability deteriorates due to cable snapping or parting
Solution Approach 1:
The safety latch system is pre-positioned and spring-loaded to automatically engage if the hoisting cable fails. The latch plates and hook are arranged to catch the telescoping mast section before it can fall, providing preliminary protection against the harmful effect of cable failure before it can cause catastrophic collapse
Solution Approach 2:
The spring-loaded latch mechanism acts as a pre-prepared safety cushion that activates automatically upon cable failure. The spring stores energy ready to engage the latch hook with the mast section, providing a cushioning effect that prevents the mast from falling the full distance and reduces impact forces
2Reliability
If clevis pins are used as safety catches, then the reliability is improved, but the ease of operation deteriorates due to misplacement, loss, or improper installation
Solution Approach 1:
The safety latch system is self-activating and requires no operator intervention. The spring-loaded mechanism automatically engages the latch hook with the mast section when the cable fails, and the release mechanism allows automatic or manual disengagement without requiring operators to manually install or position safety pins
Solution Approach 2:
The spring-loaded latch mechanism serves as an intermediary between the hoisting cable and the mast section. Instead of requiring direct manual intervention with clevis pins, the latch system mediates the safety function by automatically engaging and disengaging based on cable tension status
3Adaptability or versatility
If the mast is raised to intermediate positions, then the adaptability is improved, but the reliability of safety pins deteriorates because holes do not properly line up
Solution Approach 1:
The safety latch system transitions from a static alignment-dependent mechanism (clevis pins requiring precise hole alignment) to a dynamic spring-loaded system that can engage at various mast positions. The latch plates and hook are designed to accommodate different engagement points as the mast moves through its range of motion
4Reliability
If hydraulic systems are used to raise and lower the mast, then the reliability is improved in case of failure, but the device complexity and cost increase due to additional equipment
Solution Approach 1:
The invention extracts the safety function from the complex hydraulic system and implements it as a separate, simpler mechanical latch system. This removes the need for expensive hydraulic components while providing reliable failure protection through a dedicated safety mechanism that operates independently
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 automatic safety latch assembly significantly reduces the risk of fatal accidents by ensuring the mast assembly drops only a few inches before coming to rest, providing immediate and reliable protection at all heights without requiring operator intervention or additional equipment like hydraulic systems.
Implementation Method 1
an automatic spring-loaded safety latch assembly is integrated into the mast system, which engages the first hoisting cable with a latch mechanism
Data Source
AI summary
A safety latch telescoping mast system for a portable light tower having a towable trailer having a frame and an engine driven electrical generator and a light assembly for attachment to the uppermost end of a telescoping mast member, which includes a pivotable spring loaded safety latch assembly positioned to remain in a first, cocked, position wherein an idler roller is in rotational engagement with a hoisting cable and the latch is outside the opening in the stationary mast member when the first hoisting cable is under tension, which trips to a second, position wherein the latch passes through the opening in the stationary mast member and engages into a slot in the first telescoping mast member when the tension on the first hoisting cable is relieved.