Overhead Truck Door Mechanism for Ground-Level Operation
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Solution Overview
Problem
Users of overhead doors on cargo trucks and semi-trailers often suffer injuries while trying to open and close the doors, as they need to climb onto the truck to reach the door, especially in inclement weather, due to the doors being taller than their reach and not gliding fully open.
Innovation Solution
A door opening and closing mechanism featuring a flexible loop attached to the lower portion of the door and a guide near the top of the door frame, allowing users to open and close the door while standing on the ground by pulling on the loop, with indicators to show which side to pull for opening and closing, and the option for motorized operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the door height is increased to provide full coverage, then the door coverage is improved, but the user accessibility deteriorates requiring climbing onto the truck
Solution Approach 1:
A flexible loop mechanism serves as an intermediary between the user and the heavy door. The loop is attached to the lower portion of the door and can be pulled by the user from ground level, transmitting force to open or close the door without requiring the user to physically reach or touch the door itself.
Solution Approach 2:
The control mechanism is relocated from the vertical dimension (requiring upward reach) to the horizontal dimension (pulling at ground level). The loop extends horizontally from the door assembly, allowing users to operate the door from a standing position on the ground rather than reaching upward.
2Length of stationary object
If the door is made taller than user reach, then the door coverage is improved, but the user must climb onto the bumper leading to injuries
Solution Approach 1:
The flexible loop acts as a mediator that transfers the user's pulling force to the door mechanism. Users pull on the loop from ground level, and this force is transmitted through the loop attachment points to move the door, eliminating the need to climb onto the bumper and thereby removing the injury risk associated with falling or being pinched.
Solution Approach 2:
The door mechanism is designed to be operable from its own structural elements (the loop attached to the door) without requiring the user to position themselves in dangerous locations. The system serves itself by providing a ground-level interface that is inherently safe while maintaining full door functionality.
3Device complexity
If manual operation is used, then the device complexity is reduced, but the productivity increases due to repeated climbing and physical effort
Solution Approach 1:
The patent describes an optional motorized version where an electric motor replaces the manual pulling mechanism. The motor is mounted on the truck frame and connects to the door assembly, automatically opening and closing the door without requiring user physical effort or repeated manual intervention, thereby dramatically improving productivity while maintaining relatively simple overall system architecture.
Data Source
AI summary
An opening and closing mechanism for a roll-up cargo door for a truck is intended to decrease injuries to the people who load and unload items from box trucks and semi-trailers. The mechanism allows the user to open and close the overhead roll-up door of these trucks while standing firmly and safely on the ground at the rear corner of the truck. The door opening and closing mechanism is in the form of a loop of material that is attached to a lower portion of the roll-up door and a guide disposed near the top of the door frame. The loop is disposed along one of the vertical frame members of the door so that it is out of the way of the cargo hold when the door is open.