Power Tool Trigger Locking Mechanism for Accidental Start Prevention
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Solution Overview
Problem
Conventional power tool safety switches require continuous trigger pressing to maintain motor operation, leading to user fatigue and increased risk of accidental triggering when the switch is forgotten.
Innovation Solution
A trigger switch device with a safety switch that locks the trigger in both the pressed and non-pressed states, using springs and brake units to automatically manage the trigger's operation, preventing accidental triggering and allowing continuous motor use without continuous finger pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional safety switch is used that requires continuous trigger pressing to maintain motor operation, then the motor can be controlled to run continuously, but the user experiences fatigue and increased risk of accidental triggering
Solution Approach 1:
The trigger switch device employs a dynamic locking mechanism that automatically adapts between locked and unlocked states based on operational needs. The trigger can be locked in the pressed position to maintain continuous motor operation without user intervention, or unlocked to return to safety position, providing dynamic control that eliminates fatigue while preventing accidental triggering.
Solution Approach 2:
The trigger switch device performs self-service through its automatic locking and unlocking functionality. Once triggered, the system maintains its own operational state without requiring continuous user input, and automatically returns to safety state when needed, eliminating the need for continuous finger pressure and reducing user fatigue.
2Ease of operation
If the trigger is made easily pressable for convenient operation, then the trigger response is quick and easy, but the risk of accidental triggering increases
Solution Approach 1:
The trigger mechanism transitions from a static fixed-state design to a dynamic system that can automatically lock in the pressed position or return to the unpressed position. This dynamic capability allows the trigger to be easily pressed when needed while automatically preventing accidental triggering through its locking and automatic return functions.
Solution Approach 2:
The trigger switch device incorporates preliminary anti-action by implementing an automatic locking mechanism that prevents unintended trigger activation. The system proactively locks the trigger in the correct position or automatically returns it to safety position before accidental triggering can occur, countering potential errors before they happen.
3Reliability
If a safety lock mechanism is added to prevent accidental triggering, then accidental starts are prevented, but the device complexity increases
Solution Approach 1:
The safety lock mechanism is merged with the trigger switch assembly, integrating the locking and unlocking functions directly into the trigger structure. This combination eliminates the need for separate safety devices while providing comprehensive accidental triggering prevention, thereby reducing overall device complexity despite adding safety functionality.
Solution Approach 2:
The trigger switch device performs multiple functions within a single integrated structure: it serves as both the activation switch and the safety lock mechanism. The same components that enable trigger pressing also provide the locking and automatic return functions, making the device multi-functional and avoiding the need for additional separate safety mechanisms.
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 enhances user convenience and safety by eliminating the need for continuous trigger pressing and automatically preventing accidental starts, reducing fatigue and risk of accidental triggering.
Implementation Method 1
a first spring provided between the trigger and the handle... the first spring releasing an elastic force on the trigger to cause the trigger to return to original position
Implementation Method 2
a second spring provided between the safety switch and the handle... the second spring releasing an elastic force on the safety switch to cause the second brake unit to lock the first brake unit
Data Source
AI summary
A trigger switch device of power tool for preventing accidental triggering is disclosed, comprising a trigger, provided at front end of the handle of power tool, and a safety switch, provided at a side of the handle; when neither the trigger nor the safety switch is operated, the safety switch locks the trigger so that the trigger cannot pressed; when the safety switch is pressed, the lock on the trigger is released and the trigger can be pressed. When the safety switch is released with the trigger pressed, the safety switch locks the trigger so that the trigger remains in the pressed state; when the trigger is in the pressed state and the safety switch is operated, the trigger is unlocked and automatically returns to the original non-pressed position and the safety switch locks the trigger again. As such, the trigger cannot be pressed to prevent accidental triggering.