Ground Support Tractor Door with Retractable Closeout Panel
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Solution Overview
Problem
Ground support tractors face a challenge in designing doors that do not create impact hazards when opened, particularly in confined spaces near aircraft.
Innovation Solution
A door assembly for a ground support tractor featuring a lower track with a ramp, allowing the door to translate from a closed to an open position while the closeout panel automatically retracts from an extended to a retracted position, avoiding collisions with aircraft undercarriages or other equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the door opens outward like a typical car door, then the door structure is simple and easy to manufacture, but it creates an impact risk with other vehicles or equipment in a baggage room
Solution Approach 1:
The door assembly transitions from conventional horizontal opening motion to a vertical opening motion. The closeout panel moves downward along vertical guides when the door opens, clearing the horizontal path that would otherwise create impact hazards with equipment in confined airport spaces.
Solution Approach 2:
The door assembly incorporates a dynamic mechanism where the closeout panel can change its position relative to the main door panel. During door opening, the closeout panel dynamically transitions from a horizontal extended position to a vertical retracted position, adapting to the changing spatial requirements and avoiding collisions.
2Object-affected harmful factors
If the door opens upward like a gullwing or scissor door, then the impact risk with aircraft undercarriage is reduced, but the door structure becomes more complex
Solution Approach 1:
The door assembly uses a dynamic mechanism where the closeout panel can change its orientation and position. The panel transitions from a fixed horizontal position to a movable component that can extend downward vertically, providing the benefits of upward-like clearance without requiring complex scissor or gullwing mechanisms.
Solution Approach 2:
The door assembly is divided into separate functional components: the main door panel and the closeout panel. This segmentation allows the closeout panel to be independently controlled and positioned, enabling it to retract vertically during door opening while the main panel handles the primary opening function.
3Reliability
If the closeout panel remains in extended position during door opening, then the door provides complete coverage and sealing, but it creates collision risk with aircraft undercarriage or equipment
Solution Approach 1:
The closeout panel transitions from a static extended position to a dynamic position that changes during door operation. When the door opens, the closeout panel dynamically retracts downward along vertical guides, maintaining sealing effectiveness when closed while eliminating collision risk during opening.
Solution Approach 2:
The closeout panel retracts downward in advance before the main door panel completes its opening motion. This preliminary action ensures that the horizontal path is cleared before the door fully opens, preventing any potential collision with aircraft undercarriage or equipment while the door is in the process of opening.
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 door assembly effectively mitigates the risk of impact hazards by allowing the closeout panel to retract seamlessly as the door opens, ensuring safe operation in close proximity to aircraft.
Implementation Method 1
The ramp is configured to apply a retraction force to the closeout panel that causes the closeout panel to translate from the extended position to the retracted position responsive to the door translating from the closed position to the open position
Data Source
AI summary
A ground support tractor includes a wheeled chassis having a cabin mounted thereon. A door assembly is coupled to the cabin. The door assembly includes a lower track having a ramp and a door slidably received by the lower track and translatable in a first direction relative to the cabin between a closed position and an open position. The door includes a main panel and a closeout panel that is translatable relative to the main panel in a second direction between an extended position and a retracted position with the second direction being substantially normal to the first direction. The ramp is configured to apply a retraction force to the closeout panel that causes the closeout panel to translate from the extended position to the retracted position responsive to the door translating from the closed position to the open position.