Modular Router Sensor Interlock for Safe Motor Activation
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Solution Overview
Problem
Combination routers are inconvenient to operate due to the risk of the motor becoming energized without being properly connected to a base, and the need to release one handle to energize or deenergize the router, which can lead to precision issues during cutting or grooving.
Innovation Solution
A power tool design featuring a motor unit that can only be energized when properly connected to a base unit, with a power control circuit that ensures the motor remains off unless securely attached, and a handle-mounted power switch that allows energizing and deenergizing without releasing the handles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power switch is located on the motor unit, then the router can be controlled independently, but the motor may become energized without being properly connected to the base
Solution Approach 1:
A sensor is introduced as an intermediary component between the motor unit and base unit. The sensor detects whether the motor unit is properly connected to the base unit and transmits this information to the power control circuit, which then determines whether to allow motor operation. This intermediary mechanism ensures that the motor cannot operate without proper connection, resolving the safety concern while preserving independent control capability.
2Ease of operation
If the user must release one handle to energize or deenergize the router, then the power can be controlled, but the precision of cutting or grooving is impacted
Solution Approach 1:
The sensor acts as an intermediary that automatically monitors connection status and communicates this to the power control circuit. This eliminates the need for the user to manually release handles for power control, as the system automatically ensures proper connection before allowing operation. The user can maintain grip on both handles throughout the operation, preserving cutting precision.
3Adaptability or versatility
If the motor unit is designed to be removable, then versatility is increased, but the risk of unintended activation increases
Solution Approach 1:
The sensor performs a preliminary check to detect whether the motor unit is properly connected to the base unit before the power control circuit allows motor activation. This preliminary detection action ensures that the removable motor unit cannot be accidentally activated when detached, maintaining reliability while preserving the versatility of the modular design.
Data Source
AI summary
A power tool comprises a base unit and a motor unit. The base unit includes a handle and a first electrical connector. The motor unit includes an electric motor and a second electrical connector. The motor unit is configured to be releasably connected to the base unit. An electrical connection is established between the first electrical connector and the second electrical connector when the motor unit is properly connected to the base unit. A sensor is configured to determine whether the motor unit is properly connected to the base unit.