Trailer Overhead Door Counterbalance System
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Solution Overview
Problem
Overhead doors for trailers are often heavy due to multiple rigid panels, requiring counterbalance mechanisms that strain hinges when lifted from the bottom, potentially causing damage.
Innovation Solution
A counterbalance system using a torsion spring, cable drums, and lifting cables attached to the top rail of the door, which reduces the force needed to open and close the door by winding and unwinding the spring to rotate the drums and cables, minimizing strain on hinges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lifting cables are attached to the bottom of the door to minimize hinge strain, then hinge durability is improved, but cable damage risk increases when the door is lifted from the bottom
Solution Approach 1:
The patent inverts the conventional cable attachment location from the bottom of the door to the top rail. This inversion allows the door to be lifted from the top rather than the bottom, preventing the accordion effect that damages hinges while still providing counterbalance assistance through the modified cable routing system with return pulleys
2Reliability
If lifting cables are attached to the top of the door to prevent cable damage, then cable durability is improved, but hinge strain increases when the door is lifted from the top
Solution Approach 1:
The patent introduces return pulleys as intermediary elements that modify the cable routing path. These pulleys allow the cables to attach to the top rail while changing the direction of force application, enabling the door to be lifted from the top without directly transmitting full lifting force to the hinges, thus reducing hinge strain while maintaining cable durability
3Strength
If multiple rigid panels are used to construct the door for structural strength, then door strength is improved, but door weight increases requiring counterbalance mechanisms
Solution Approach 1:
The patent implements a counterbalance system using a torsion spring connected through cable drums and lifting cables that attach to the top rail of the door. This counterbalance mechanism offsets the weight of the multi-panel door, reducing the force required to open and close the door while maintaining the structural integrity provided by multiple rigid panels
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
The system reduces the force required to operate the door, minimizes strain on hinges, and protects cables from damage by routing them internally, ensuring safe and efficient operation.
Implementation Method 1
a counterbalance system having a torsion spring, a shaft, a first cable drum and second cable drum
Data Source
AI summary
A trailer overhead door system for a truck or trailer having a door opening. The trailer overhead door system having a trailer door for enclosing the door opening and a counterbalance system for counterbalancing the trailer door. The counterbalance system including a lifting cable and a return pulley for guiding the lifting cable. The lifting cable attaching between a door top rail, around the return pulley, and back to the counterbalance system.