Overhead Truck Door Loop 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 or closing, and optional motorized operation for easier use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the door is made taller to provide full coverage, then the door coverage is improved, but the user cannot reach the door to open or close it
Solution Approach 1:
A loop mechanism acts as an intermediary between the user and the door. The loop is attached to the lower portion of the door and extends downward to within easy reach of the user. When the user pulls or pushes the loop, this force is transmitted through the door assembly to open or close the door, eliminating the need for the user to physically reach the top of the door.
2Device complexity
If the door does not glide fully open, then the door structure is simpler, but the user must climb onto the truck to push it to fully open position
Solution Approach 1:
The loop mechanism serves as a force transmission intermediary that allows the user to apply force to the door from ground level. By pulling or pushing the loop, the user can generate sufficient force to move the door to its fully open or closed position without climbing onto the truck, thereby achieving complete door operation while maintaining simple door structure.
3Ease of operation
If the user climbs onto the bumper to reach the door, then the user can open and close the door, but injuries occur from climbing and jumping
Solution Approach 1:
The loop mechanism acts as a safe intermediary that transfers the user's pulling or pushing force to the door system. The user remains on stable ground throughout the operation, grasping the loop which is positioned at an ergonomic height. This eliminates the harmful climbing and jumping actions while maintaining effective door control.
Solution Approach 2:
The loop mechanism is designed to be self-contained and self-explanatory, with indicators showing which side to pull for opening or closing. The system serves itself by providing intuitive feedback to the user, reducing the need for complex instructions or training while minimizing injury risk through ergonomic design.
4Device complexity
If the loop is positioned inside the door opening, then the mechanism is simpler, but the loop interferes with people and loaders moving in and out
Solution Approach 1:
The loop mechanism is repositioned from within the door opening space to the exterior surface of the door. By moving the loop to the outside of the door, the system utilizes the vertical dimension of the door surface rather than occupying the horizontal door opening space. This allows people and loaders to move freely through the door opening without interference from the loop mechanism.
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.