G-Weight Switch Mechanism for Projectile Arming
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Solution Overview
Problem
Existing acceleration-activated switches, or g-switches, face challenges in reliably maintaining an unarmed state during storage, transitioning to an armed state upon launch, and sustaining the armed position under varying acceleration levels without electrical contact breaks.
Innovation Solution
A tubular switch mechanism with a g-weight that moves from an open to a closed position under threshold acceleration, completing an electrical path, and features like breakable legs and deformable pedals ensure reliable arming and maintenance of the armed state, with a transparent closure for visual inspection and potential mass/material adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a g-weight is used to actuate the switch under acceleration, then the switch can be armed upon launch, but the g-weight may fail to reliably maintain the armed position under varying acceleration levels
Solution Approach 1:
The g-weight is designed with breakable legs that pre-position the weight to engage the contact pin upon reaching threshold acceleration. The breakable legs act as a preliminary mechanism that ensures the g-weight is ready to make contact and maintain the armed position once the threshold is exceeded, preventing premature or failed arming.
Solution Approach 2:
The contact pin serves as an intermediary element between the g-weight and the electrical circuit. When the g-weight moves under acceleration, the contact pin translates this mechanical motion into electrical contact, reliably closing the circuit and maintaining the armed position through the intermediary action of the pin.
2Object-affected harmful factors
If the switch mechanism is enclosed to protect internal components, then protection is improved, but visual inspection of the g-weight position requires disassembly
Solution Approach 1:
The closure is made transparent or translucent, allowing visual inspection of the g-weight position through the closure itself. This eliminates the need to disassemble the enclosure for inspection while maintaining protection, as the transparent material allows light transmission for viewing purposes.
Solution Approach 2:
The transparent closure acts as a thin film barrier that provides protection while allowing visual penetration. This flexible approach to enclosure maintains the sealed environment for component protection while enabling optical inspection without compromising the protective function.
3Loss of information
If the g-weight is made visible through a transparent closure, then visual verification is improved, but the closure must maintain transparency while providing adequate protection
Solution Approach 1:
The closure is manufactured from transparent or translucent material that allows visual observation of the g-weight position while maintaining environmental protection. The transparent material permits light transmission for viewing purposes while still providing a barrier against contamination and physical damage to internal components.
Solution Approach 2:
The closure uses composite or specially formulated transparent materials that combine optical clarity with protective properties. These materials provide both the visual transparency needed for inspection and the structural integrity needed for protection, merging two seemingly conflicting requirements into a single functional component.
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 mechanism reliably arms a projectile by maintaining the armed state under high acceleration, preventing electrical contact breaks and allowing for visual verification without disassembly, with adjustable settings for different acceleration thresholds.
Implementation Method 1
a g-weight positioned inside the tubular enclosure and movable from an open position to a closed position... The g-weight is for moving from the open position to the closed position when the switch mechanism is subjected to an acceleration greater than a threshold acceleration
Implementation Method 2
The g-weight is visible through the transparent closure such that the position of the g-weight can be determined without removing the transparent closure from the tubular enclosure
Data Source
AI summary
A switch mechanism is provided that has a tubular enclosure; a contact pin electrically insulated from the tubular enclosure; a g-weight positioned inside the tubular enclosure and movable from an open position to a closed position; and a transparent closure that encloses one end of the tubular enclosure. The g-weight is in electrical contact with the contact pin and the tubular enclosure when the g-weight is in the closed position, such that a continuous electrical path exists from the contact pin to the tubular enclosure. The g-weight is for moving from the open position to the closed position when the switch mechanism is subjected to an acceleration greater than a threshold acceleration. The g-weight is visible through the transparent closure such that the position of the g-weight can be determined without removing the transparent closure from the tubular enclosure.