Battery-Powered Nibbler With Motor Reversal for Jam Clearance
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Solution Overview
Problem
Typical reciprocating power tools, such as nibblers, often jam when cutting thicker gauge sheet metal and are limited by their reliance on AC power or compressed air, which restricts access and maneuverability.
Innovation Solution
A handheld power tool with an electric motor and eccentric drive that converts rotational motion into reciprocating motion, featuring a controller that automatically reverses the motor direction to clear jams and operates on a rechargeable battery pack, allowing for efficient cutting of thicker materials without the need for a power cord or air hose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a typical nibbler is used to cut thicker gauge sheet metal, then cutting capability is improved, but the tool experiences jams and reduced reliability
Solution Approach 1:
The patent applies reverse rotation capability to the motor, allowing the punch to reciprocate in both forward and reverse directions. When a jam is detected, the motor automatically reverses rotation to clear the obstruction, transforming a unidirectional cutting tool into a bidirectional system that can self-correct jam conditions, thereby maintaining reliability while preserving cutting capability
2Duration of action of stationary object
If AC power or compressed air is used to power the nibbler, then continuous operation is achieved, but access and maneuverability are limited by power cords or air hoses
Solution Approach 1:
The patent replaces the mechanical delivery systems (power cords for AC power, air hoses for compressed air) with a portable battery-powered electric motor system. This substitution eliminates the physical constraints of cords and hoses, providing unrestricted maneuverability while maintaining continuous operation capability through rechargeable battery power
Solution Approach 2:
The patent extracts the power source from external fixed infrastructure (AC outlets, compressed air systems) and incorporates a self-contained battery pack into the tool itself. This extraction removes the dependency on external power delivery mechanisms, freeing the tool from cord and hose constraints while enabling continuous operation through internal energy storage
3Productivity
If the motor operates in a single direction, then the eccentric drive can reciprocate the tool element, but the tool cannot clear jams automatically
Solution Approach 1:
The patent transforms the motor from a static single-direction device to a dynamic bidirectional system. The controller monitors operation and automatically reverses motor rotation when jams are detected, allowing the tool to adapt its rotation direction in real-time. This dynamic capability enables automatic jam clearance while preserving cutting efficiency during normal operation
Solution Approach 2:
The patent implements a feedback control system where the controller monitors motor operation and tool element movement. When a jam condition is detected through sensor feedback or operational parameters, the controller automatically triggers motor reversal to clear the jam, then resumes normal cutting operation. This closed-loop feedback mechanism maintains productivity while providing automatic reliability protection
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 tool effectively prevents jams by reversing the motor direction, enabling efficient cutting of thicker materials and improving maneuverability with a battery-powered design, reducing the risk of motor stress and allowing continuous operation.
Implementation Method 1
an electric motor disposed within the housing and having a motor shaft configured to rotate about an axis
Implementation Method 2
an eccentric drive coupled to the electric motor, the eccentric drive configured to convert a rotational input from the motor shaft into a reciprocating motion of the tool element
Data Source
AI summary
A power tool includes a tool element extending from a housing, an electric motor disposed within the housing, a switch actuatable to energize the electric motor, an eccentric drive coupled to the electric motor and configured to convert a rotational input from the motor into a reciprocating motion of the tool element, and a controller configured to control operation of the electric motor. The electric motor is operable in a first mode to rotate in a first direction and in a second mode to rotate in a second direction opposite the first direction. The eccentric drive is configured to reciprocate the tool element when the electric motor is operated in the first mode and when the electric motor is operated in the second mode. The controller is configured to control the electric motor to alternate between the first mode and the second mode with each actuation of the switch.