Electric Screwdriver Reactive Force Counteracting Mechanism
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Solution Overview
Problem
Conventional electric screwdrivers do not effectively address the reactive force issue during screw tightening, leading to worker fatigue and reduced accuracy due to changes in holding state under the influence of reactive force.
Innovation Solution
An electric screwdriver design that includes a flywheel driven in the same direction as the bit holder, a brake to offset reactive force, and a brake operating mechanism that adjusts based on the magnitude of reactive force, allowing for reduced reactive force through controlled braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a clutch mechanism and tightening torque control means are used to control tightening torque, then tightening torque accuracy is improved, but reactive force is not reduced leading to worker fatigue and reduced screw tightening accuracy
Solution Approach 1:
The patent introduces a reactive force counteracting mechanism that generates a force opposite to the reactive force produced during screw tightening. This counter force offsets the harmful reactive force, reducing worker fatigue and preventing changes in holding state, thereby maintaining screw tightening accuracy while directly addressing the harmful factor.
Solution Approach 2:
The patent introduces a mediator mechanism (reactive force counteracting mechanism) between the motor and the bit holder that actively compensates for reactive force. This intermediary system detects and counteracts the reactive force, allowing the primary tightening mechanism to focus on torque control while the mediator handles the harmful reactive force component.
2Device complexity
If conventional electric screwdriver design is used, then device complexity is kept simple, but worker fatigue increases and screw tightening accuracy deteriorates due to uncountered reactive force
Solution Approach 1:
The reactive force counteracting mechanism serves as a counterweight system that balances the reactive force without requiring complete redesign of the basic screwdriver structure. By adding this specific counteracting component, the system maintains operational simplicity while significantly improving reliability and reducing worker fatigue.
3Ease of operation
If reactive force is not counteracted, then device operation is simple, but worker fatigue increases and holding state changes reduce accuracy
Solution Approach 1:
The reactive force counteracting mechanism operates automatically in response to the reactive force generated during tightening. The system self-regulates by detecting the reactive force and generating the appropriate counter force without requiring additional manual intervention, thereby maintaining ease of operation while improving precision.
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
This design reduces the load on the worker and improves screw tightening accuracy by offsetting reactive force, maintaining consistent holding state and effectiveness even during long or high-torque operations.
Implementation Method 1
a flywheel (3) rotatively driven by a motor (M1) in the direction same as the direction of rotation of the bit holder (2)
Implementation Method 2
a brake (4) generating a reactive force F1 in the direction offsetting the reactive force F2 transmitted from the bit to the body casing (1) through the bit holder (2), by braking the flywheel (3)
Data Source
AI summary
An electric screwdriver capable of reducing the reactive force produced on the occasion of a screw tightening work, etc. The electric screwdriver is designed to transmit the rotational driving force of a first motor to the bit through a bit holder, and it includes a flywheel rotatively driven by a second motor in the direction same as the direction of rotation of the bit holder, a brake generating a reactive force in the direction offsetting the reactive force transmitted from the bit to the body casing through the bit holder, by braking the flywheel, and a brake operating mechanism for operating the brake in response to the magnitude of the reactive force transmitted from the bit to the body casing through the bit holder.