Power Tool Locking Switch With Decreasing Unlock Force
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Solution Overview
Problem
Chainsaws often unintentionally activate due to accidental trigger switch actuation, posing safety risks, and existing safety switches require a force greater than 20 N, leading to a poor user experience.
Innovation Solution
A power tool with a locking switch that transitions from a locking state to an unlocking state through a decreasing force mechanism, incorporating a locking retainer and magnetic members to ensure safety compliance while improving user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety switch with actuation force >= 20 N is used to prevent accidental activation, then safety is improved, but user experience deteriorates due to difficulty in operation
Solution Approach 1:
The locking retainer applies a dynamic locking force to the locking switch that decreases during the transition from locking state to unlocking state. The locking force is largest when the locking switch is in the locking state (providing safety against accidental activation) and gradually decreases as the user operates the locking switch (improving ease of operation). This dynamic adjustment of locking force resolves the contradiction between safety and ease of operation.
Solution Approach 2:
The patent changes the parameter of locking force magnitude during the operation process. The locking retainer is configured to apply a locking force that changes from large to small during the process of switching from locking state to unlocking state. This parameter change allows the system to maintain high safety (large locking force) when needed while reducing resistance (small locking force) during intentional operation.
2Reliability
If a high locking force is applied to prevent accidental trigger activation, then safety is improved, but the force required to operate the locking switch increases excessively
Solution Approach 1:
The locking force applied by the locking retainer is dynamic rather than static. It is configured to be largest when the locking switch is in the locking state (providing safety) and to decrease during the transition to the unlocking state. This dynamic characteristic allows the system to maintain high safety without requiring excessively high force throughout the entire operation process.
Solution Approach 2:
The locking force is applied periodically or in stages during the operation of the locking switch. The locking retainer maintains high locking force at the beginning (locking state) and reduces it during the transition (unlocking state), creating a periodic pattern of force application that balances safety and operability.
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 effectively prevents accidental activation while meeting safety regulations by requiring a force of at least 20 N, enhancing user safety and comfort.
Implementation Method 1
the locking retainer includes a magnetic member
Data Source
Figure 1
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AI summary
A power tool includes a tool body, a grip, a trigger, a locking switch, and a locking retainer. The locking retainer is configured to apply a locking force to the locking switch to keep the locking switch in the locking state. During a process in which the locking switch is operated to switch from the locking state to the unlocking state, the locking force changes from large to small.