Ladder-Mounted Material Lift With Rail-Guided Platform Stability
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Solution Overview
Problem
Existing material lifting systems for extension ladders are either unstable, costly, or require significant customization, posing safety risks and inconvenience for workers.
Innovation Solution
A ladder-mountable material lift with a hoist and platform that can be easily installed on standard extension ladders, allowing workers to maintain three-point contact while lifting materials using a motor-powered system with remote control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rope-and-pulley systems are used for material lifting, then material transport capability is provided, but system stability deteriorates and falling material risk increases
Solution Approach 1:
The patent replaces the traditional rope-and-pulley mechanical system with a motorized hoist system that uses a drum and cable arrangement. The hoist motor provides controlled winding and unwinding of the cable, replacing the passive mechanical advantage of pulleys with active motor control, thereby improving reliability while maintaining material transport capability
Solution Approach 2:
The patent introduces a platform as an intermediary carrier between the worker and the material. Instead of workers directly handling materials on the ladder, the platform serves as a stable intermediate structure that holds materials, eliminating the instability and safety risks associated with rope-and-pulley systems
2Adaptability or versatility
If lifting platforms are used to travel along the ladder, then material transport capability is improved, but device complexity and customization requirements increase
Solution Approach 1:
The patent divides the material lifting system into separate modular components: a platform with side brackets, a hoist assembly, and connection cables. This segmentation allows each component to be independently designed and assembled, enabling the system to be attached to standard ladders without requiring ladder modification or customization
Solution Approach 2:
The platform design with side brackets that engage with ladder rails makes the system universally applicable to standard extension ladders. The brackets are designed to fit conventional ladder dimensions, allowing the same platform assembly to be used across different ladder models without customization, thereby reducing device complexity
3Ease of manufacture
If workers carry material while climbing the ladder, then equipment cost is reduced, but worker safety deteriorates
Solution Approach 1:
The patent introduces a platform as an intermediary carrier between the worker and the material. Instead of workers directly handling materials on the ladder, the platform serves as a stable intermediate structure that holds materials, eliminating the instability and safety risks associated with carrying materials while climbing
Solution Approach 2:
The patent replaces manual material carrying with a motorized hoist system that automatically lifts and positions materials. The hoist motor performs the lifting work, substituting the physical effort and safety risks of manual material handling with automated mechanical lifting
Data Source
AI summary
A ladder-mountable material lift for mounting on an extension ladder, having a hoist for engaging with an upper rung of the extension ladder and a platform moveable by the hoist between a lower end of the extension ladder and the hoist. The platform has upper and lower side brackets on each side of the platform, the lower side brackets for sliding along upper surfaces of the side rails of the ladder base section and the upper side brackets for sliding along upper surfaces of the side rails of the ladder fly section, such that operation of the hoist causes the platform to move upwardly or downwardly along the extension ladder.