Direct-Coupled Fastening Driver Without Flywheel or Return Spring
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Solution Overview
Problem
Powered fastening tools face inefficiencies due to complex drive motor assemblies, driver return systems, and driver retention systems, which affect reliability and energy conversion efficiency, and are hindered by high dynamic loading forces on compression return springs.
Innovation Solution
A powered fastening tool with a driver directly coupled to an electric motor, eliminating the need for a clutch and incorporating a rack and pinion or slotted link mechanism to transfer energy directly, reducing complexity and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rotating flywheel is used to engage the driver, then energy can be stored and transferred to the driver, but the attack angle changes and energy transfer efficiency decreases as the driver wears
Solution Approach 1:
The patent removes the flywheel from the system entirely, replacing the mechanical energy storage and transfer mechanism with a direct electric motor-to-driver coupling. This eliminates the attack angle variation problem that occurs with flywheel engagement as the driver wears, providing consistent energy transfer efficiency throughout the tool's operational life.
Solution Approach 2:
The patent replaces the mechanical flywheel-based energy storage and transfer system with an electric motor system that directly drives the driver. This substitution of mechanical energy storage with electrical energy storage and direct electromagnetic drive eliminates the wear-related efficiency degradation inherent in mechanical engagement systems.
2Ease of operation
If compression return springs are used to return the driver, then the driver can be returned to home position, but the high dynamic loading forces reduce spring fatigue life and require more space
Solution Approach 1:
The patent removes the compression return springs from the system, replacing the mechanical spring-based return mechanism with a direct electric motor reversal system. The motor can simply reverse rotation to return the driver to the home position, eliminating the high dynamic loading forces that cause spring fatigue and the space required to accommodate compressed springs.
Solution Approach 2:
The patent replaces the mechanical spring-based driver return system with an electric motor system that uses electromagnetic force to return the driver. This substitution eliminates the fatigue life limitations of compression springs under high dynamic loading while maintaining automatic driver return functionality.
3Adaptability or versatility
If numerous components are included in the drive motor assembly, driver return system, and driver retention system, then the tool can perform its functions, but the complexity increases and reliability decreases
Solution Approach 1:
The patent combines multiple separate systems (drive motor assembly, driver return system, driver retention system) into a single integrated electric motor system. The motor directly couples to the driver and performs both drive and return functions through directional control, eliminating the need for separate return springs, retention mechanisms, and associated components, thereby reducing overall system complexity while maintaining functionality.
4Ease of operation
If components are included to enable driver movement and retention, then the driver can be controlled, but the efficiency of converting electrical energy to mechanical energy is reduced
Solution Approach 1:
The patent removes intermediate mechanical components (flywheels, clutch mechanisms, return springs, retention systems) that were necessary in traditional designs to control driver movement. By directly coupling the electric motor to the driver, the system eliminates energy losses associated with mechanical transmission, engagement, and storage, achieving superior energy conversion efficiency while maintaining full driver control through electronic management of motor direction and torque.
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 direct coupling of the driver to the electric motor enhances energy transfer efficiency and reduces tool complexity, achieving reliability comparable to pneumatic fastening tools without the need for energy storage devices like flywheels.
Implementation Method 1
The electric motor is operable to move the driver from a home position to an extended position to discharge a fastener. In addition, the electric motor is operable to return the driver from the extended position to the home position.
Data Source
AI summary
A powered fastening tool includes an electric motor and a driver directly coupled to the electric motor. The electric motor is operable to move the driver from a home position to an extended position to discharge a fastener. In addition, the electric motor is operable to return the driver from the extended position to the home position.