Cargo Unloader Bladder Drive for Self-Anchored Truck Bed Unloading
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Solution Overview
Problem
Existing cargo unloading systems for vehicles face challenges when there is no available fixed post or pulling device to remove cargo, leading to inefficiencies in unloading cargo without fouling the truck bed.
Innovation Solution
A tension-loaded drive mechanism with bladders and a strap system that expands rearward to apply a compression counter force, using a compressor to increase pressure and dispense straps at a predetermined rate, allowing a plow to move cargo without direct attachment to the truck bed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a chain, rope, or pulling device is used to attach cargo to a tree or fixed post for unloading, then cargo can be removed from the truck bed, but the system becomes unavailable when no fixed post is available or the device has been removed for another purpose
Solution Approach 1:
The truck bed itself serves as the anchoring system through integrated anchor points, eliminating the need for external trees or fixed posts. The cargo unloader system uses the vehicle's own structure (anchor points in the truck bed) to provide the reactive force needed for unloading, making the system self-sufficient and always available.
Solution Approach 2:
The cargo unloader system integrates multiple functions: the compressor serves both as a power source for the bladders and as part of the drive mechanism, while the anchor points serve both for securing the unloader system and for potential cargo tie-downs. This multi-functionality ensures the system is always available regardless of external conditions.
2Productivity
If cargo is moved by pushing or manual labor, then cargo can be unloaded, but the process becomes time-consuming and labor-intensive
Solution Approach 1:
The system replaces manual pushing or traditional mechanical winch systems with a pneumatic bladder-based propulsion system. The bladders inflate to push the cargo forward, eliminating the need for continuous manual intervention or complex mechanical winding mechanisms, thereby significantly reducing unloading time and labor requirements.
Solution Approach 2:
The cargo unloader operates in periodic cycles: the bladders inflate to propel the cargo forward, then deflate and retract to reset their position. This periodic inflate-deflate cycle allows continuous cargo movement without requiring the bladders to remain extended, maintaining system readiness and reducing overall unloading time.
3Reliability
If the plow is attached directly to the cargo bed with fasteners, then the plow can be securely positioned, but the fasteners can be fouled by cargo and become inoperative
Solution Approach 1:
The system extracts the plow from direct contact with cargo by positioning it above the cargo load, supported by the tensioned straps and bladders rather than by fasteners embedded in or near the cargo path. This separation eliminates the risk of cargo fouling the attachment mechanism while maintaining secure positioning through the tension-loaded strap system.
Solution Approach 2:
The straps and bladders serve as intermediaries between the plow and the truck bed structure. Instead of the plow being directly attached to the cargo bed via fasteners that could be fouled, the tensioned straps transmit the securing force through the bladders, keeping the plow clear of cargo contamination while maintaining reliable attachment.
4Ease of operation
If the bladders expand continuously to move cargo, then cargo can be moved rearward, but the system cannot maintain controlled positioning or correct tilting
Solution Approach 1:
The system incorporates sensors that detect the plow's position and orientation, providing feedback to the control system. Based on this feedback, the controller selectively activates specific bladders to correct tilting or adjust positioning, enabling precise control of cargo movement while maintaining plow stability and proper orientation throughout the unloading process.
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
Efficiently unloads cargo by applying a drive force to move cargo rearward, maintaining orientation and avoiding fouling of the truck bed, with a system that can correct tilting and adjust payout based on sensor feedback.
Implementation Method 1
a compressor for increasing the pressure of a fluid
Implementation Method 2
Each bladder is configured to expand in a rearward direction along a longitudinal axis of a cargo bed, in response to the associated bladder receiving the fluid from the compressor
Implementation Method 3
The spools are further configured to apply a compression counter force via the straps to the associated bladders in a forward direction opposite to the rearward direction. The compression counter force increases the pressure of the fluid in the associated bladders to a predetermined drive pressure threshold
Data Source
AI summary
A tension-loaded drive mechanism (“mechanism”) is provided for a cargo unloader. The drive mechanism includes a compressor for increasing the pressure of a fluid. The drive mechanism further includes multiple bladders fluidly connected to the compressor to receive the fluid from the compressor and expand in a rearward direction along a longitudinal axis of a cargo bed. The mechanism further includes a strap system having multiple straps attached to each bladder. The strap system further includes multiple spools configured to apply a compression counter force via the straps to the associated bladders, such that the compression counter force increases the pressure of the fluid in the associated bladders to a predetermined drive pressure threshold. The spools are further configured to dispense an associated one of the straps at a predetermined stepped payout rate such that the associated bladders apply a drive force associated with the predetermined drive pressure threshold.