Electric Hand Tool Tactile Feedback Mechanism

The patent employs a vibration device that generates tactile vibrations in the handle when the tool is in stand-by mode with power ON. This mechanical vibration provides a detectable physical signal to the operator through the handle, enabling them to sense the power status without visual or auditory cues. The vibration ceases when the trigger is activated or power is turned OFF, thus resolving the information loss problem while maintaining silent operation.

The patent implements a feedback mechanism where the vibration device provides continuous tactile feedback to the operator about the power status. The control unit monitors the power state and trigger position, and automatically activates or deactivates the vibration feedback accordingly. This closed-loop feedback system ensures the operator always knows the power status, preventing accidental activation while consuming minimal energy.

The patent uses periodic or conditional activation of the vibration device rather than continuous operation. The vibration is activated only during specific periods: when power is ON and trigger is NOT activated (stand-by mode). The vibration automatically stops when the trigger is pulled or power is turned OFF. This periodic action provides necessary safety feedback only when needed, significantly reducing overall power consumption while maintaining operator safety during critical periods.

The patent applies partial action by providing vibration feedback only during the stand-by mode with power ON, rather than continuously during all operational states. This partial feedback approach is sufficient to prevent accidental activation (the critical safety need) while avoiding unnecessary energy consumption during active operation or when power is OFF. The feedback is precisely targeted to the situation where it is most needed.