Pivoting Cover Hinge with Load-Sensitive Detachment
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Solution Overview
Problem
Conventional case covers used in aircraft cockpits are rigid and heavy, making them unsuitable for supporting heavy loads without deformation, which poses a risk during maintenance when technicians need to step on them.
Innovation Solution
A case design featuring a hinge system with a connector that allows the cover to detach when an excessive load is applied, incorporating a spring-loaded ball type stop and retention mechanisms like magnets or a leaf spring to manage the cover's movement and positioning, ensuring the cover remains light and less rigid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover is made rigid and heavy to withstand heavy loads, then the strength and load-bearing capacity are improved, but the weight increases and the cover becomes more difficult to operate
Solution Approach 1:
The hinge connector is designed to dynamically change its state based on applied load. Under normal conditions, it maintains a rigid connection for strength. When excessive load is applied, the connector automatically transitions to a detached or pivoting state, allowing the cover to fail safely rather than deform. This dynamic behavior resolves the contradiction by providing strength when needed and weight reduction when not needed.
Solution Approach 2:
The mechanical properties of the hinge connection change based on the applied force parameter. The connector is designed with specific mechanical characteristics (such as a pivot point or detachment mechanism) that allow it to transition from a rigid state to a flexible or detached state when a threshold load is exceeded. This parameter-based transition enables the cover to be lightweight while maintaining sufficient strength for normal operation.
2Strength
If the cover is made rigid and heavy to withstand heavy loads, then the strength and load-bearing capacity are improved, but the ease of operation deteriorates
Solution Approach 1:
The hinge connector provides dynamic support: it maintains rigid connection during normal operation for ease of handling, but automatically becomes flexible or detached when excessive load is applied. This dynamic transition ensures the cover remains easy to operate under normal conditions while providing safety through controlled failure under extreme loads.
Solution Approach 2:
The hinge connector is designed with a predetermined failure mode or pivoting mechanism that activates before the cover can deform or cause injury. When excessive load is applied, the connector automatically transitions to a safe state (detachment or pivoting), cushioning against the harmful effects of overload and protecting both the cover and the operator.
3Reliability
If a connector is added to allow detachment under excessive load, then the safety is improved, but the device complexity increases
Solution Approach 1:
The hinge connector is designed to automatically detect and respond to excessive load without external intervention. The mechanical design (such as a pivot point, detachment mechanism, or load-sensitive element) enables the connector to self-regulate by transitioning from a rigid to a flexible or detached state when a threshold load is exceeded. This self-service capability provides safety while minimizing the need for complex control systems.
Solution Approach 2:
The hinge connector acts as an intermediary element between the cover and the vessel. It mediates the force transmission, allowing controlled pivoting or detachment under excessive load while maintaining a rigid connection during normal operation. This intermediary mechanism provides safety through a simple mechanical transition rather than requiring complex active control systems.
4Weight of moving object
If the cover is made less rigid and lighter, then the weight is reduced and ease of operation is improved, but the strength and load-bearing capacity deteriorate
Solution Approach 1:
The hinge connector provides dynamic structural support: it maintains rigidity during normal operation to provide sufficient strength, but automatically becomes flexible or detached when excessive load is applied. This dynamic transition enables the cover to be lightweight while maintaining adequate strength for normal use, as the rigidity is only present when needed.
Solution Approach 2:
The hinge connector is pre-designed with a predetermined failure mode or pivoting mechanism that activates before the cover can deform or cause injury. This preliminary action ensures that when excessive load is applied, the cover fails safely through controlled detachment or pivoting rather than deformation, allowing the use of lighter materials.
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 solution enables the case cover to safely support heavy loads by detaching when necessary, preventing deformation and allowing for easy one-handed operation, enhancing safety and usability during maintenance.
Implementation Method 1
the connector may include a spring-loaded ball type stop
Implementation Method 2
the retainer includes at least one magnet and, for each magnet, a metal element, one from the cover or the vessel comprises at least one magnet and the other from the vessel or the cover comprises, for each magnet, a metal element
Data Source
AI summary
A case including: a vessel, a cover mounted to be moved in rotation on the vessel via a hinge system which has a hinge axis and at least one hinge, wherein each hinge has a first portion which is fixedly joined to the vessel, a second portion) which is fixedly joined to the cover and a connector which assumes alternately an operating position in which the connector ensures the connection between the second portion and the first portion to allow for rotation of the second portion relative to the first portion about the hinge axis and, alternatively, a safety position in which the connector dissociates the second portion and the first portion.