Ladder Caddy with Dual Wheel Sets for Vertical Payload Transport
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Solution Overview
Problem
Existing equipment for moving payloads in construction and home improvement industries, such as scissor lifts and pulley systems, are cumbersome, time-consuming, expensive, and not suitable for sites with limited access, posing safety risks and inefficiencies, especially when manual ladder climbing is necessary.
Innovation Solution
A ladder caddy with main and extension wheels adapted to roll on ladder rails, allowing for easy movement and vertical transport of payloads using a pulley system, eliminating the need for manual ladder climbing and reducing worker fatigue and risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic, electric or gasoline powered lifting machinery (scissor lifts, conveyor belts, ladder lifts) are used to transport payloads, then lifting capacity and safety are improved, but device complexity, cost, and requirement for energy source increase
Solution Approach 1:
The lifting system is segmented into simple components: a ladder-mounted carriage with wheels that roll on ladder rails, connected to a winch system. This divides the complex lifting function into manageable parts (wheels for support, rope for lifting, winch for control) that can be implemented with simple, reliable mechanisms rather than complex hydraulic or electric systems.
Solution Approach 2:
The system uses the ladder structure itself as the support framework for the carriage wheels, eliminating the need for separate support structures. The ladder rails serve dual purposes: as the climbing surface and as the track for the wheeled carriage, making the system self-supporting and reducing overall complexity.
2Reliability
If hydraulic, electric or gasoline powered lifting machinery are used to transport payloads, then lifting capacity is improved, but portability and ease of movement deteriorate
Solution Approach 1:
The system is divided into portable components: the ladder caddy with wheels can be easily attached to and removed from any standard extension ladder, and the winch system can be manually operated or powered. This modular approach allows the equipment to be transported and deployed as needed without being a permanent installation.
Solution Approach 2:
The wheeled carriage acts as an intermediary between the ladder structure and the payload, providing a simple mechanical interface that transfers the lifting force from the rope/winch system to the payload without requiring complex machinery. The wheels on the carriage provide smooth movement along the ladder rails.
3Device complexity
If manual ladder climbing is used to carry payloads, then equipment complexity is reduced, but worker safety and fatigue worsen
Solution Approach 1:
The wheeled carriage serves as an intermediary device between the worker and the payload. Instead of workers manually carrying heavy loads up the ladder, the carriage with its wheels rolls smoothly along the ladder rails while the payload is secured to it, dramatically reducing physical strain and safety risks for workers.
Solution Approach 2:
The system allows the payload to be lifted by its own weight through the mechanical advantage of the pulley and winch system, rather than requiring human strength to lift it. The worker only needs to operate the winch or pull the rope, while the system handles the heavy lifting automatically.
4Reliability
If rope wheels and pulley systems are used to lift payloads, then manual lifting is eliminated, but practicality and ease of use deteriorate
Solution Approach 1:
The system uses a dynamic wheeled carriage that can move freely along the ladder rails, adapting to the ladder's position and angle. The wheels provide continuous contact and smooth movement, making the system practical and easy to operate compared to static rope wheel systems that require precise positioning and alignment.
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
Enables safe, efficient, and cost-effective vertical transport of payloads, reducing worker fatigue and risk of injury, while being compact and lightweight for use in various locations, including those with limited access.
Implementation Method 1
main wheels are adapted to roll on the rails of a main section of an extension ladder and the extension wheels are adapted to roll on the rails of an extension of the extension ladder
Implementation Method 2
The apparatus is then leaned onto a ladder to position main wheels of the apparatus onto rails of a main section of an extension ladder. The apparatus is moved up on the ladder using a rope or cable.
Data Source
AI summary
Material transport equipment includes first and second pairs of main wheels and first and second pairs of extension wheels rotatably attached to a frame. The main wheels have a diameter greater than the extension wheels and are spaced further apart than the extension wheels. The main wheels and the extension wheels are adapted to roll on the rails of a main section and of an extension, respectively, of an extension ladder. The equipment may be used as a hand truck for carrying a payload on ground wheels rolling on the ground. The apparatus may then be leaned to position main wheels of the apparatus onto rails of a main section of an extension ladder. Extension wheels on the apparatus move onto rails of the extension of the ladder as the apparatus moves up from the main section onto the extension using a rope or cable.