Fastener Driver Recoil Suppression via Counter-Mass
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Solution Overview
Problem
Existing fastener driving devices face challenges in achieving a balance between providing sufficient energy to drive fasteners efficiently while minimizing recoil, which leads to issues like bent fasteners, damage to workpieces, and increased user fatigue, particularly due to the limitations of traditional spring-based systems that result in excessive recoil and complex tool motions.
Innovation Solution
A fastener driving device utilizing a composite material drive spring, a coupler mechanism, and a motor to compress and release the spring efficiently, with a recoil suppression system that includes a counter mass to minimize recoil, allowing for pre-compression of the spring and rapid energy release, and incorporating a mode switch and timer for controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional spring-based systems are used to drive fasteners, then sufficient energy can be delivered, but excessive recoil occurs causing bent fasteners, workpiece damage, and user fatigue
Solution Approach 1:
A counter-mass is integrated into the driver assembly to balance the recoil force generated during fastener driving. The counter-mass is positioned and sized to create an opposing moment that counteracts the tool's recoil motion, reducing the harmful effects of recoil on fasteners, workpieces, and user fatigue while maintaining the high drive force capability of the spring-based system
2Object-affected harmful factors
If tool weight is increased to reduce recoil, then recoil is minimized, but user fatigue increases and one-hand operation becomes difficult
Solution Approach 1:
Instead of increasing overall tool weight, a counter-mass is strategically positioned within the driver assembly to create a localized balancing effect. This internal counter-weight system generates opposing moments that reduce recoil without significantly increasing the tool's overall weight, enabling lightweight construction while maintaining recoil control and one-hand operability
3Object-affected harmful factors
If drive time is extended to reduce recoil, then recoil is minimized, but productivity decreases due to slower operation
Solution Approach 1:
The counter-mass system allows for reduced drive times by effectively managing recoil forces throughout the driving cycle. By balancing the recoil moment, the system enables faster driving speeds without compromising fastener quality or workpiece integrity, thereby maintaining high productivity while minimizing recoil effects
4Object-affected harmful factors
If driver weight is reduced to minimize recoil, then recoil is reduced, but the tool cannot adequately drive fasteners into workpiece
Solution Approach 1:
The counter-mass is integrated into the driver assembly to provide recoil balancing without increasing the driver's overall weight. The counter-mass creates an opposing moment that counteracts recoil while the driver maintains its lightweight design and high drive force capability, enabling effective fastener driving with minimal recoil
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 enables a lightweight, efficient fastener driving device that minimizes recoil, enhances functionality, and allows for bump fire actuation, providing sufficient energy with reduced recoil and improved user comfort, while maintaining structural integrity and efficient energy transfer.
Implementation Method 1
a spring that moves the fastener driver through a drive stroke
Implementation Method 2
a counter mass for suppressing recoil
Data Source
AI summary
A fastener driving device includes a fastener driver, a magazine for carrying a supply of fasteners to the fastener driver, a spring that moves the fastener driver through a drive stroke, and a motor configured to move the fastener driver through a return stroke. The motor is operable upon completion of the drive stroke, to move the fastener driver partially through the return stroke a predetermined amount to partially pre-compress the spring. The motor is further operable to fully compress the spring after receiving a signal for the drive stroke.