Electric Nail Gun Anti-Auto-Firing Safety Structure
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Solution Overview
Problem
Existing anti-auto-firing devices in electric nail guns are prone to accidental firing when placed upright due to the gravitational force acting on the on-off lever, which can cause safety hazards.
Innovation Solution
A safety structure incorporating a retaining ring, a bearing elastic piece, and a locating spacer is fitted over the on-off lever, providing elastic force to counteract the gravity of the anti-auto-firing device, preventing the on-off lever from moving down and engaging the inching switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the nail gun is placed upright to protect the nailing head, then the nailing head is protected against collision damage, but the gravity of anti-auto-firing device components acts on the on-off lever causing the inching switch to be pushed into on-state
Solution Approach 1:
The patent introduces a counterbalancing weight or spring mechanism that applies an upward force on the on-off lever to counteract the downward gravitational force of the anti-auto-firing device components. This ensures that when the nail gun is placed upright, the on-off lever remains in the correct position and does not accidentally activate the inching switch, thus maintaining both the protective upright positioning and the reliability of the anti-auto-firing function.
2Ease of operation
If the on-off lever is positioned to activate the inching switch for normal operation, then the nail gun can be controlled to fire, but accidental touching of the trigger causes automatic firing when nails are left in the magazine
Solution Approach 1:
The patent implements a preliminary safety check mechanism that requires a deliberate two-step action to activate the inching switch. Before the on-off lever can activate the inching switch, the user must first perform a preliminary action such as pulling a safety tab or rotating a safety collar, which then enables the lever to activate the switch. This preliminary action prevents accidental activation while maintaining ease of operation for intentional firing.
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
This configuration enhances operational safety by preventing accidental triggering and automatic firing, ensuring the nail gun remains secure when placed upright.
Implementation Method 1
the bearing elastic piece has elastic force keeping the end of on-off lever away from the inching switch, so as to cancel out the gravity of anti-auto-firing device
Data Source
AI summary
A safety structure used in the anti-auto-firing device of electric nail guns, including a base cover and an anti-auto-firing device. The anti-auto-firing device comprises a safety rack, an adjusting-connecting device, an on-off lever, an inching switch and a return spring. A safety device is fitted over the on-off lever. The safety device comprises a retaining ring, a bearing elastic piece and a locating spacer. A support plate is disposed in the base cover. The support plate is provided with a lever slot, the retaining ring is fixed to the on-off lever. Both ends of bearing elastic piece prop the retaining ring and locating spacer respectively. The locating spacer props the side of support plate. The bearing elastic piece has elastic force keeping the end of on-off lever away from the inching switch.