Power Tool Switch Assembly With Locking Trigger Interlock
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing safety switches in power tools often lead to accidental activation due to unintentional pressing, causing dangerous situations, as the actuation of safety and starting switches is not distinctly differentiated, posing safety concerns and limiting their use under new safety regulations.
Innovation Solution
A switch assembly with a locking mechanism where the locking switch and trigger switch are in a mutual abutting state in the non-use position, preventing accidental activation, and require deliberate release and pressing to initiate the main control switch, ensuring the power tool remains in a locked state until intended use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional gripping type switch assembly is used with safety switch and starting switch arranged on the handle, then the structure is simple and convenient to use, but the actuation of safety switch and starting switch cannot be distinguished significantly, leading to accidental activation and safety hazards
Solution Approach 1:
The switch assembly is segmented into distinct functional components: a safety switch (first switch) and a starting switch (second switch), with each having separate actuating mechanisms. The safety switch includes a safety button that must be pressed first, while the starting switch includes a trigger that must be pulled. This segmentation creates clear functional and operational differentiation between the two switches, eliminating the confusion that led to accidental activation while maintaining the gripping type convenience.
2Ease of operation
If the safety switch is arranged to be pressed before the starting switch in a gripping type assembly, then the switching function is achieved, but accidental activation still occurs due to insufficient distinction between the two switch actuations
Solution Approach 1:
The safety switch and starting switch are designed with asymmetric actuation mechanisms: the safety switch uses a pressing motion (pushing the safety button inward), while the starting switch uses a pulling motion (drawing the trigger toward the user). This asymmetric design creates intuitively different operational gestures that are difficult to confuse, effectively preventing accidental activation while maintaining ease of operation. The asymmetric design also provides clear tactile feedback to distinguish between the two switch functions.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The disclosure provides a switch assembly, a switch assembly starting method and a power tool. The switch assembly comprises a housing, a main control switch accommodated in the housing, a locking switch and a trigger switch arranged on the housing. An end of the trigger switch is accommodated in the housing and is in contact with the main control switch. An end of the locking switch is in contact with the trigger switch. The locking switch has a locking position and a releasing position, when the locking switch is in the locking position, the locking switch limits the trigger switch in a locked state, and the main control switch cannot be started; when the locking switch is in the releasing position, the locking switch is positioned beside the trigger switch and limits are removed, the trigger switch is in the release state, and the main control switch can be started.