Tiltable Tugger Cart Bed With Differential Pressure Valve
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Solution Overview
Problem
Wheeled tugger carts often struggle with unloading and reorienting heavy or large pallets and containers, making it difficult and time-consuming for workers to access the contents, especially in factory settings where significant weight and size are involved.
Innovation Solution
A tugger cart design featuring a pivotable support platform that can tilt to an acute angle, equipped with a bed locking structure and a differential pressure valve-controlled cylinder assembly, allowing for easy reorientation and access to the contents without requiring manual repositioning based on load weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the support platform is made fixed and horizontal, then the structure is simple and stable, but the worker cannot easily access the interior of heavy containers
Solution Approach 1:
The support platform is designed to be dynamically tiltable, transitioning from a fixed horizontal position to an inclined position. The platform can be tilted at a predetermined angle (e.g., 45 degrees) to allow workers easy access to the interior of containers, then returned to horizontal for stable transport. This dynamic capability resolves the contradiction by providing ease of access when needed while maintaining structural simplicity during normal operation.
Solution Approach 2:
The platform is pre-configured with a locking mechanism that automatically locks the platform in the inclined position after tilting. This preliminary locking action ensures the platform remains stable during unloading operations without requiring continuous manual intervention, thereby providing easy access while maintaining operational safety and simplicity.
2Ease of operation
If the platform is tilted to allow access, then the worker can access container interior easily, but the platform becomes unstable during transport
Solution Approach 1:
The locking mechanism is pre-configured to automatically engage and lock the platform in the inclined position after tilting. This preliminary locking action ensures the platform remains stable during unloading operations without requiring continuous manual intervention, thereby providing easy access while maintaining operational safety and simplicity.
Solution Approach 2:
The locking mechanism is designed to automatically lock the platform in the inclined position using the platform's own weight and the locking structure's geometry. The mechanism self-activates when the platform is tilted, eliminating the need for external locking devices or continuous manual operation, thus maintaining stability during access operations.
3Productivity
If manual repositioning is required for heavy loads, then the structure remains simple, but the worker effort and time increase significantly
Solution Approach 1:
The support platform is designed to be dynamically tiltable, transitioning from a fixed horizontal position to an inclined position. The platform can be tilted at a predetermined angle (e.g., 45 degrees) to allow workers easy access to the interior of containers, then returned to horizontal for stable transport. This dynamic capability resolves the contradiction by providing ease of access when needed while maintaining structural simplicity during normal operation.
Solution Approach 2:
The tiltable platform allows the container to be positioned at an optimal angle for unloading, creating an equipotential state where the load can be easily accessed without requiring additional manual lifting or repositioning. The platform's inclination angle is designed to work with gravity, allowing containers to be unloaded with minimal worker effort while maintaining structural simplicity.
4Adaptability or versatility
If the platform tilts at a fixed rate, then the mechanism is simple, but the pivoting rate cannot be controlled for different load weights
Solution Approach 1:
The pivoting rate is made adaptable by incorporating a flow control valve that regulates the speed of the piston's movement. The valve allows the system to adjust the pivoting rate dynamically based on load weight, ensuring consistent and controlled tilting performance across different loading conditions without requiring complex mechanical rate-control mechanisms.
Solution Approach 2:
The cylinder assembly uses pneumatic or hydraulic principles with a flow control valve to regulate the pivoting rate. The valve controls the flow of fluid to the piston, enabling smooth and consistent tilting motion regardless of load weight. This approach provides adaptable rate control while maintaining relatively simple mechanism design.
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
Facilitates simple and efficient unloading and reorientation of pallets and containers, reducing the effort required for workers and ensuring consistent pivoting rates regardless of load weight, thereby enhancing operational efficiency in factory environments.
Implementation Method 1
A differential pressure valve has an upstream input communicating with the first portion of the cavity and a downstream output communicating with the second portion of the cavity. The flow rate of the fluid at the output of the differential pressure valve is constant in response to various pressures of the fluid at the input.
Implementation Method 2
The cylinder assembly may also include a check valve for controlling the flow of fluid from the second portion to the first portion of the cavity.
Implementation Method 3
A piston slidably extends through the cavity in the housing
Data Source
AI summary
A tugger cart is provided for transporting a load about a factory or the like. The tugger cart includes a support frame and a wheel assembly operatively connected to the support frame for supporting the support frame above a supporting surface. A bed pivotably mounted to the support frame for receiving the load thereon. The bed is movable between a first position wherein the bed lies in a generally horizontal plane and a second position wherein the bed is at a predetermined angle to the horizontal plane.