Tiltable Mobile Cart for Roofing Material Handling
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Solution Overview
Problem
The transportation of heavy 15-gallon drums of roofing adhesive and spray foam insulation, along with accompanying equipment, poses safety and logistical challenges due to their weight and size, making it difficult to move them to upper levels or onto roofs safely.
Innovation Solution
A mobile cart with a tiltable frame, wheels, and a carrier tray that can securely hold and stabilize containers, along with a combination mixer and dispenser, allows for safe and efficient transportation of roofing materials by tilting the cart for easy loading and unloading of heavy containers, and supports the cart in a horizontal position for easy movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If 15-gallon drums are used to store roofing adhesive and spray foam insulation, then the quantity of material available increases and cost efficiency improves, but the weight of the containers increases to approximately 150 lbs, making transportation challenging and potentially unsafe
Solution Approach 1:
The heavy 150 lb drum is segmented into two lighter 7.5-gallon containers that can be separately handled and positioned in the carrier tray. This division reduces the weight each worker must manage individually while maintaining the total quantity of material needed for the roofing job.
Solution Approach 2:
A mobile cart with a carrier tray serves as an intermediary device between the heavy materials and the workers. The cart accepts various container sizes, provides mechanical support for heavy loads, and includes tilting functionality to facilitate easy loading and unloading, thereby mediating the transportation challenge.
2Ease of operation
If heavy containers are transported manually to upper levels or onto roofs, then the materials can be delivered to the work site, but the risk of injury and equipment damage increases
Solution Approach 1:
By dividing the heavy drum into two lighter containers, the physical strain on workers is reduced, lowering the risk of musculoskeletal injuries during handling and transportation to upper levels or roof surfaces.
Solution Approach 2:
The mobile cart acts as a safe intermediary that bears the weight of heavy containers during transportation. Workers interact with the cart rather than directly lifting heavy loads, significantly reducing injury risk while enabling safe delivery of materials to elevated work areas.
3Productivity
If the cart is kept in a horizontal position for easy movement, then transportation efficiency improves, but stable loading and unloading of containers becomes difficult
Solution Approach 1:
The carrier tray is designed to dynamically change its orientation between horizontal and tilted positions. During transportation, it remains horizontal for efficiency; during loading/unloading, it tilts to provide stable container placement. This dynamic adaptability resolves the contradiction between movement efficiency and loading stability.
4Stability of the object's composition
If the cart is tilted for loading and unloading, then container stability improves, but the cart cannot be easily moved
Solution Approach 1:
The carrier tray dynamically adjusts its position: tilted during loading/unloading to maximize container stability, and horizontal during transportation to enable easy movement. This temporal separation of functions allows the system to optimize for stability when needed and mobility when needed.
Solution Approach 2:
The carrier tray alternates between tilted and horizontal positions in a periodic manner corresponding to the loading and transportation cycles. It tilts periodically during loading/unloading operations and returns to horizontal position periodically for movement, creating a rhythmic pattern that satisfies both stability and mobility requirements.
Data Source
AI summary
A mobile cart includes a cart frame, wheels rotatably attached to the frame and feet projecting from the frame to an underlying support surface. A carrier tray is fixedly secured atop the cart frame, having a generally planar tray base, a front wall extending upwardly from the front end of the tray base and a cavity. A first container, containing a first material, and a second container, containing a second material, are positioned in the cavity. A combination mixer and dispenser is releasably secured to the frame and releasably fluidly coupled to the first and second containers. The cart is tiltable between a generally horizontal position and a generally vertical position. The front wall of the tray is angled from the tray base such that the front wall lies against the support surface in the generally vertical position, stabilizing the cart for container loading and unloading.