Resettable Mechanical Trigger for Ejection System Training
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Solution Overview
Problem
Ejection systems in aircraft lack an effective mechanism for simulating the ejection initiation force, which is crucial for training and testing purposes, as existing systems do not allow for reliable re-assembly and reuse of the sear and firing pin configuration.
Innovation Solution
A mechanical trigger device comprising a housing with a slot and a firing pin, a spring, and a reset screw, along with a sear that can engage and disengage the firing pin, allowing for the simulation of ejection initiation forces and subsequent re-assembly, is developed. This device includes a conduit and a rod coupled to the sear, enabling the mechanical trigger device to be reset after use, facilitating the re-engagement of the sear with the firing pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional ejection system is used, then the ejection function is achieved, but the system cannot be re-assembled and reused for training and testing purposes
Solution Approach 1:
The ejection system is divided into separable components including the sear, firing pin, and initiator assembly. The sear can be detached from the firing pin, allowing the initiator to be removed and replaced with a simulation device for training purposes, while maintaining the integrity of the main ejection system.
Solution Approach 2:
A simulation device is introduced as an intermediary component that can replace the initiator assembly. This mediator allows training and testing operations without consuming the actual ejection system components, enabling repeated use for training while preserving the original system for actual ejection operations.
2Productivity
If the sear and firing pin are designed for single-use, then the system is simpler, but training and testing capabilities are lost
Solution Approach 1:
The system transitions from a static single-use configuration to a dynamic reconfigurable system. The sear and firing pin are designed with movable and adjustable features that allow them to be disassembled, repositioned, and re-assembled multiple times for training operations while maintaining functional integrity.
Solution Approach 2:
The system is pre-configured with features that facilitate easy disassembly and re-assembly, such as removable components and alignment features. This preliminary design enables rapid reconfiguration for training purposes without requiring complex tools or procedures during the training operation.
3Reliability
If the ejection system components are made durable for reuse, then reusability is improved, but the initial system complexity increases
Solution Approach 1:
The mechanical trigger device incorporates self-aligning features and intuitive assembly interfaces that guide the operator through the re-assembly process without requiring specialized knowledge or tools. The components are designed to automatically align and secure themselves, reducing the complexity of the re-assembly operation while ensuring reliable connection.
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 mechanical trigger device effectively simulates the ejection initiation force, allowing for the training and testing of ejection systems by enabling the re-assembly and reuse of the sear and firing pin configuration, thereby enhancing the training and evaluation processes for pilots.
Implementation Method 1
a spring wrapped around the firing pin
Data Source
AI summary
A mechanical trigger device comprises a reset screw configured to re-assemble the mechanical trigger device. The resettable screw may be disposed in a slot in a housing of the mechanical trigger device and coupled to a firing pin disposed within the housing. The reset screw may be configured to translate the firing pin within the housing and re-engage a sear after use of the mechanical trigger device.