Airplane Refuse Unloading Safety Gate and Air Brake Assembly
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Solution Overview
Problem
Current methods for unloading airplane-derived refuse are time-consuming, pose safety risks to personnel, and can damage aircraft, with existing systems being inefficient and prone to leakage of refuse-derived liquids, leading to unpleasant odors and maintenance challenges.
Innovation Solution
A system comprising a safety gate connected to a chute with an air brake assembly, a pneumatically releasable lock cylinder, and a compaction chamber with a main platen mount that prevents refuse introduction during compaction, using short-stroke pistons to ensure efficient and safe refuse handling and compaction without large hydraulic rams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If refuse is manually collected in plastic bags and removed via the airplane staircase, then the unloading process can be performed with simple equipment, but the method is time consuming and imposes an excessive load on expensive manpower
Solution Approach 1:
The patent introduces a service vehicle with a bridge mechanism as an intermediary between the airplane access door and ground level. This bridge acts as a mediator that enables efficient refuse transfer without requiring manual carrying via stairs, thus resolving the contradiction between equipment simplicity and unloading productivity
Solution Approach 2:
The patent replaces the manual mechanical system of carrying bags down stairs with a automated conveyer belt system mounted on the service vehicle. This substitution of manual labor with automated mechanical conveyance dramatically increases unloading speed while maintaining reasonable equipment complexity
2Ease of operation
If the airplane access door is opened from ground level, then the personnel are at risk of falling from height of 5 m, but using a protective platform and belt still leaves a distinct risk of falling
Solution Approach 1:
The patent inverts the traditional approach by having the service vehicle raise its platform to meet the access door at height, rather than having personnel climb up to open the door. The bridge mechanism with integrated conveyer belt positions the loading point at the door level, eliminating the need for personnel to lean out or work at height
Solution Approach 2:
The extendable bridge mechanism serves as an intermediary structure that connects ground level to the access door height. This intermediate platform provides a safe working environment with built-in protective railings, eliminating the fall risk associated with direct access from ground level to the open door
3Productivity
If a chute is used to convey refuse bags gravitationally from the access door to the service vehicle, then the unloading process is accelerated, but the service vehicle may impact the airplane and damage its fuselage or wing when an excessive or uncontrolled force is transmitted to the chute
Solution Approach 1:
The patent employs a dynamically adjustable bridge mechanism that can extend and retract based on the position of the service vehicle. The bridge incorporates adjustable support legs and positioning mechanisms that allow real-time adaptation to maintain optimal tension and alignment, preventing excessive force transmission to the airplane structure while maintaining efficient refuse flow
Solution Approach 2:
The system changes the physical parameters of the bridge mechanism including its length, angle, and support position to optimize refuse conveyance. By dynamically adjusting these parameters, the system maintains controlled force transmission that prevents airplane damage while ensuring efficient gravitational flow of refuse bags
4Productivity
If the upper opening through which refuse is introduced into the compaction chamber is not completely occluded during compacting operation, then refuse continues to be introduced into the compaction chamber even while the vertical press platen is involved in a compacting operation, but leaving the opening open allows refuse-derived liquids and solids to exit and soile the surroundings
Solution Approach 1:
The patent implements a periodic operation cycle where the compaction chamber opening is opened for refuse intake, then closed and sealed during the compaction phase. The system alternates between intake mode and compaction mode, ensuring the opening is completely occluded during compacting operations to prevent leakage and odors, then reopened for the next batch of refuse
Solution Approach 2:
The system extracts the refuse intake function from the compaction phase by using separate loading and compaction cycles. The opening occlusion mechanism is activated specifically during compaction operations, separating the harmful leakage effect from the productive compaction process while maintaining continuous operational capability through rapid cycle repetition
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 enables safe, efficient, and uninterrupted refuse unloading and compaction, reducing the risk of personnel injury, aircraft damage, and odor emission, while minimizing maintenance costs through controlled refuse handling and compacting mechanisms.
Implementation Method 1
an air brake assembly comprising a pneumatically releasable lock cylinder and a bar that is pivotally connected at one end to said safety gate and is received within an interior of said lock cylinder
Implementation Method 2
said lock cylinder is configured with a spring that is biased to radially displace said bar to a wall of the bore and to thereby apply a locking force onto said bar that immobilizes said safety gate
Implementation Method 3
a chute in communication with said receiving chamber, along which the refuse gravitates
Data Source
Figure 1
Figure 2~3
Figure 4~5A
AI summary
A refuse unloading system comprises an upper-opening chamber (15) for receiving airplane-derived refuse; a chute (8) in communication with the chamber; a chute-connected safety gate (5) which is settable in falling preventing relation with respect to an access door of an airplane from which the refuse is unloadable, the safety gate having an upper border over which refuse is transferable via the access door into the chute and is gravitationally dischargeable to the chamber; and an air brake assembly operatively connected to the safety gate, for immobilizing the safety gate when the chute ceases to be vertically displaced, to prevent personnel from accidently falling. In a method, a platen mount with a vertical platen and an occluding surface located below the opening is driven without interfering with clogged refuse, between a first position for facilitating introduction of refuse through the opening and a second position at which the opening is completely occluded.