Power Tool Light Unit with Timer Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Handheld power tools often operate in substandard lighting conditions, necessitating a built-in lighting solution that provides adequate illumination for the workpiece and remains functional even when the tool is not in use.
Innovation Solution
A power tool with a light unit controlled by a circuit that adjusts brightness levels and remains illuminated for a predetermined time after the switch is activated or deactivated, featuring a timer and resistor configuration to manage power delivery and maintain light functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light unit remains illuminated after the switch is deactivated, then the tool can be used as a flashlight and located easily in dark environments, but energy is continuously consumed even when the tool is not in use
Solution Approach 1:
The light unit dynamically adjusts its operation in two distinct modes: when the trigger is pulled, the light operates at full brightness for immediate illumination; when the trigger is released, the light automatically transitions to a timed countdown mode where it gradually dims and shuts off after a predetermined period, optimizing energy consumption while maintaining flashlight functionality when needed
Solution Approach 2:
The system implements periodic action through a predetermined time delay mechanism that automatically controls the light unit's shutdown sequence. After the trigger is released, the light remains on for a specific duration set by a timer circuit, creating a rhythmic on-off pattern that balances usability with energy conservation
2Illumination intensity
If the light unit provides bright illumination during operation, then visibility in low-light conditions is enhanced, but energy consumption increases
Solution Approach 1:
The light unit applies partial action by providing full brightness illumination only when absolutely necessary during active tool operation, while implementing a gradual dimming sequence during the shutdown phase where the light transitions from full intensity to complete darkness over a predetermined time period, reducing overall energy consumption while maintaining adequate visibility
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 ensures consistent illumination for the user, enhancing visibility in low-light conditions and allowing the tool to serve as a flashlight or for easy location in dark environments, while maintaining power to the light unit after the tool is switched off.
Implementation Method 1
A light unit is coupled to the housing, configured to illuminate a work surface
Implementation Method 2
The light unit control circuit includes a timer configured to keep the light unit illuminated for a predetermined amount of time after the switch unit has been activated or deactivated
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A power tool includes a motor, a light unit, and a switch unit for selectively connecting the motor and the light unit to the power source. A control module includes a controller coupled to a first electronic switch to control power delivery to the motor based on a position of the switch unit, and coupled to a second electronic switch to control power delivery to the light source based on a position of the switch unit. The controller also includes a timer configured to keep the light unit illuminated for a predetermined amount of time after the switch unit has been activated or deactivated. The control module also includes a boot circuit connected to the controller. The boot circuit includes a semiconductor switch configured to continue to deliver power to the controller and to the light unit when the switch unit is deactivated subsequent to being activated, to enable the light unit to remain illuminated after the switch unit has been deactivated.